Dr. Orlin D. Velev received M.Sc. and Ph.D. degrees from the University of Sofia, Bulgaria, while also spending one year as a researcher in Nagayama Protein Array Project in Japan. After graduating in 1996, Velev accepted a postdoctoral position with the Department of Chemical Engineering, University of Delaware. He initiated an innovative program in colloidal assembly and nanomaterials and was promoted to research faculty in 1998. In 2001 formed his new research group in the Department of Chemical and Biomolecular Engineering, North Carolina State University, where he was promoted to an Associate Professor with tenure in 2006, to full professor in 2008, to chaired professor in 2009 and to distinguished professor in 2018. He has contributed more than 240 publications, which have been cited more than 37,000 times, and has presented more than 310 invited presentations at major conferences and at universities and companies. His awards include among others NSF Career, Langmuir Lecturer, AIChE Acrivos Professional Progress, Camille Dreyfus Teacher-Scholar, Sigma Xi, NC State Alcoa Distinguished Engineering Research, NC State Alumni Distinguished Undergraduate Professor, NC State Innovator of the Year, Springer Colloid and Polymer Science Lecture Award. Velev has been elected to an ACS Fellow and MRS Fellow. He has served as member of the Editorial Advisory Boards of Langmuir, Chem. Mater., Biomicrofluidics and Particle and as Section Editor of Curr. Opin. Colloid Interface Sci. Velev has established a record of innovative research in the area of colloids and nanostructures with electrical and photonic functionality, biosensors, microfluidics and nanomanufacturing. He has been the first to synthesize "inverse opals", one of the most widely studied types of photonic materials today. Velev has also pioneered techniques for making novel nanoparticle materials, Janus particles, rod-like particles, and responsive foams. Technologies based on his research have formed the basis of two Research Triangle Area startup companies. He has been an advocate of incorporating the latest achievements in the areas of nanoscience and nanotechnology in the engineering curriculum.

Works (274)

Updated: April 3rd, 2024 23:21

2024 article

Colloidal Engineering of Microplastic Capture with Biodegradable Soft Dendritic "Microcleaners"

Bang, R. S., Verster, L., Hong, H., Pal, L., & Velev, O. D. (2024, March 1). LANGMUIR, Vol. 3.

By: R. Bang n, L. Verster n, H. Hong n, L. Pal n & O. Velev n

Sources: Web Of Science, NC State University Libraries
Added: March 18, 2024

2024 article

Harvesting and manipulating sweat and interstitial fluid in microfluidic devices

Saha, T., Mukherjee, S., Dickey, M. D., & Velev, O. D. (2024, January 10). LAB ON A CHIP, Vol. 1.

By: T. Saha n, S. Mukherjee n, M. Dickey n & O. Velev n

TL;DR: This review reports on the utilization of microfluidics towards sweat and ISF management and transport, and focuses on microfluidic principles of sweat and ISF generation, transport, extraction, and management. (via Semantic Scholar)
Sources: Web Of Science, NC State University Libraries, ORCID
Added: January 22, 2024

2024 article

Isothermal Titration Calorimetry Reveals Entropy-Driven Bisphenol A Epoxy Resin Adhesion to Metal Oxide Surfaces

Jani, P. K., Farias, B. V., Jain, R. K., Houston, K. R., Velev, O. D., Santiso, E. E., … Khan, S. A. (2024, January 31). MACROMOLECULES, Vol. 1.

By: P. Jani n, B. Farias n, R. Jain n, K. Houston*, O. Velev n, E. Santiso n, L. Hsiao n, S. Khan n

Sources: Web Of Science, NC State University Libraries, ORCID
Added: February 1, 2024

2024 article

Sustainable Soft Electronics Combining Recyclable Metal Nanowire Circuits and Biodegradable Gel Film Substrates

Liu, Y., Ahmad, M., Venditti, R. A., Velev, O. D., & Zhu, Y. (2024, January 15). ADVANCED ELECTRONIC MATERIALS, Vol. 1.

By: Y. Liu n, M. Ahmad n, R. Venditti n, O. Velev n & Y. Zhu n

author keywords: biodegradable substrates; electronic waste; recyclable metal nanowires; sustainable soft electronics
Sources: Web Of Science, NC State University Libraries
Added: February 12, 2024

2023 article

An integrated chemical engineering approach to understanding microplastics

Bang, R. S., Bergman, M., Li, T., Mukherjee, F., Alshehri, A. S., Abbott, N. L., … You, F. (2023, January 26). AICHE JOURNAL, Vol. 1.

author keywords: artificial intelligence; biochemical engineering; interfacial processes; microplastic; hermodynamics/statisticaL
UN Sustainable Development Goal Categories
14. Life Below Water (Web of Science)
Sources: Web Of Science, NC State University Libraries
Added: February 20, 2023

2023 article

Assembly and manipulation of responsive and flexible colloidal structures by magnetic and capillary interactions

Basu, A., Okello, L. B. B., Castellanos, N., Roh, S., & Velev, O. D. D. (2023, March 14). SOFT MATTER, Vol. 3.

By: A. Basu n, L. Okello n, N. Castellanos n, S. Roh n & O. Velev n

Sources: Web Of Science, NC State University Libraries
Added: April 11, 2023

2023 article

Computational investigation of the phase behavior of colloidal squares with offset magnetic dipoles

Dorsey, M. A., Velev, O. D., & Hall, C. K. (2023, May 19). SOFT MATTER, Vol. 5.

By: M. Dorsey n, O. Velev n & C. Hall n

Sources: Web Of Science, NC State University Libraries
Added: June 12, 2023

2023 journal article

Hierarchically reinforced biopolymer composite films as multifunctional plastics substitute

CELL REPORTS PHYSICAL SCIENCE, 4(12).

By: Y. Kotb n & O. Velev n

Sources: Web Of Science, NC State University Libraries
Added: January 29, 2024

2023 journal article

Molecular structure effects on the mechanisms of corrosion protection of model epoxy coatings on metals

Materials Chemistry Frontiers, 7(2), 274–286.

By: Y. Kotb n, C. Serfass n, A. Cagnard*, K. Houston*, S. Khan n, L. Hsiao n, O. Velev n

Sources: Web Of Science, NC State University Libraries, ORCID, Crossref
Added: December 14, 2022

2023 review

Polymer Color Intelligence: Effect of Materials, Instruments, and Measurement Techniques - A Review

[Review of ]. ACS OMEGA, 8(26), 23257–23270.

By: S. Agate n, A. Williams n, J. Dougherty*, O. Velev n & L. Pal n

Sources: Web Of Science, NC State University Libraries, ORCID
Added: June 22, 2023

2023 article

The Science of Active Colloids Continues to Evolve while Crossing Discipline Boundaries

Krafft, M. P., Velev, O. D., & Abbott, N. L. (2023, April). CURRENT OPINION IN COLLOID & INTERFACE SCIENCE, Vol. 64.

By: M. Krafft*, O. Velev n & N. Abbott*

UN Sustainable Development Goal Categories
Sources: Web Of Science, NC State University Libraries
Added: April 24, 2023

2022 review

A Critical Review of the Performance and Soil Biodegradability Profiles of Biobased Natural and Chemically Synthesized Polymers in Industrial Applications

[Review of ]. ENVIRONMENTAL SCIENCE & TECHNOLOGY, 56(4), 2071–2095.

By: P. Tyagi n, S. Agate n, O. Velev n, L. Lucia n & L. Pal n

author keywords: biodegradation; biopolymers; bioplastics; uv stability; packaging; sustainability
MeSH headings : Biodegradation, Environmental; Biopolymers / chemistry; Biopolymers / metabolism; Plastics; Polymers; Soil
TL;DR: This review discusses end-fate of biopolymers in soil and impact of residues on soil health, and design considerations and implications for sustainable polymers used, under consideration, and to be considered within the context of a rational biodegradable strategy are elaborated. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Sources: Web Of Science, NC State University Libraries, ORCID
Added: January 26, 2022

2022 review

AC electrohydrodynamic propulsion and rotation of active particles of engineered shape and asymmetry

[Review of ]. CURRENT OPINION IN COLLOID & INTERFACE SCIENCE, 59.

By: N. Diwakar n, G. Kunti*, T. Miloh*, G. Yossifon* & O. Velev n

author keywords: Induced charge electrophoresis; Active particles; AC field
UN Sustainable Development Goal Categories
7. Affordable and Clean Energy (OpenAlex)
Sources: Web Of Science, NC State University Libraries
Added: June 6, 2022

2022 journal article

An accelerated antibody aggregation test based on time sequenced dynamic light scattering

COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS, 653.

By: C. Conner n, J. McAndrew*, S. Menegatti n & O. Velev n

author keywords: Protein colloidal stability; Protein aggregation; Dynamic light scattering; Antibodies
UN Sustainable Development Goal Categories
Sources: Web Of Science, NC State University Libraries
Added: November 21, 2022

2022 article

Controlled adhesion, membrane pinning and vesicle transport by Janus particles

Ewins, E. J., Han, K., Bharti, B., Robinson, T., Velev, O. D., & Dimova, R. (2022, January 26). CHEMICAL COMMUNICATIONS, Vol. 1.

MeSH headings : Biological Transport; Cell Adhesion; Cell Membrane / metabolism; Magnetic Fields; Multifunctional Nanoparticles / metabolism; Static Electricity
Sources: Web Of Science, NC State University Libraries
Added: February 28, 2022

2022 journal article

Efficacy and Mechanisms of Copper Ion-Catalyzed Inactivation of Human Norovirus br

ACS INFECTIOUS DISEASES, 8(4), 855–864.

By: B. Mertens n, M. Moore n, L. Jaykus n & O. Velev n

author keywords: norovirus; viral inactivation; antiviral; copper; Tulane virus; disinfection
MeSH headings : Alloys / pharmacology; Capsid Proteins; Catalysis; Copper / pharmacology; Ions; Norovirus / drug effects; Norovirus / physiology; Virus Inactivation
TL;DR: The combined data demonstrate that stabilized Cu(I) ion solutions show promise as highly effective noroviral disinfectants in solution that can potentially be utilized at low concentrations for inactivation of human noroviruses. (via Semantic Scholar)
Sources: Web Of Science, NC State University Libraries
Added: May 16, 2022

2022 article

Light scattering of colloidal suspensions: formation and stability in bourbon whiskeys

Williams, S. J., Islam, S., & Velev, O. D. (2022, May 2). JOURNAL OF THE INSTITUTE OF BREWING, Vol. 5.

By: S. Williams*, S. Islam n & O. Velev n

author keywords: dynamic light scattering; stability; bourbon; whiskey; aging
UN Sustainable Development Goal Categories
13. Climate Action (Web of Science)
Sources: Web Of Science, NC State University Libraries
Added: May 16, 2022

2022 journal article

Optically Modulated Propulsion of Electric-Field-Powered Photoconducting Janus Particles

PHYSICAL REVIEW APPLIED, 18(2).

By: M. Zehavi*, D. Sofer*, T. Miloh*, O. Velev n & G. Yossifon*

UN Sustainable Development Goal Categories
7. Affordable and Clean Energy (OpenAlex)
Sources: Web Of Science, NC State University Libraries
Added: September 12, 2022

2022 article

Silica Supraparticles with Self-Oscillatory Vertical Propulsion: Mechanism & Theoretical Description

Kim, H.-ju, Sperling, M., Velev, O. D., & Gradzielski, M. (2022, June 14). Silica Supraparticles with Self-Oscillatory Vertical Propulsion: Mechanism & Theoretical Description. PARTICLE & PARTICLE SYSTEMS CHARACTERIZATION, Vol. 6.

author keywords: droplet templating; oscillating movements; self-propelling; silica; supraparticles; superhydrophobic surfaces
Sources: Web Of Science, NC State University Libraries
Added: June 27, 2022

2022 journal article

Structure-Performance Relationships of Li-Ion Battery Fiber-Based Separators

ACS APPLIED POLYMER MATERIALS, 4(5), 3676–3686.

By: S. Luiso n, M. Petrecca n, A. Williams n, J. Christopher n, O. Velev n, B. Pourdeyhimi n, P. Fedkiw n

author keywords: meltblown; electrospun; shear; PVDF; nonwoven; separator; batteries
UN Sustainable Development Goal Categories
Sources: Web Of Science, NC State University Libraries, ORCID
Added: April 27, 2022

2022 article

Superhydrophobic and Anti-Icing Coatings Made of Hierarchically Nanofibrillated Polymer Colloids

Williams, A. H., Roh, S., Kotb, Y., & Velev, O. D. (2022, September 1). MACROMOLECULAR RAPID COMMUNICATIONS, Vol. 9.

By: A. Williams n, S. Roh n, Y. Kotb n & O. Velev n

author keywords: anti-icing; nanofibers; nonwovens; soft dendritic colloids; superhydrophobic coatings
UN Sustainable Development Goal Categories
Sources: Web Of Science, NC State University Libraries
Added: September 12, 2022

2022 journal article

What makes epoxy-phenolic coatings on metals ubiquitous: Surface energetics and molecular adhesion characteristics

JOURNAL OF COLLOID AND INTERFACE SCIENCE, 608, 634–643.

By: Y. Kotb n, A. Cagnard*, K. Houston*, S. Khan n, L. Hsiao n & O. Velev n

author keywords: Adhesion; Polymer; metal interactions; Epoxy coatings; Contact angle; Surface energy; Pull-off test; XPS
MeSH headings : Epoxy Compounds; Epoxy Resins; Physical Phenomena; Steel; Wettability
TL;DR: Theoretical adhesion results reveal a superior adhesion of epoxy compared to phenolic resins, and epoxy resins having a higher content of epoxide-to-hydroxyl groups show improved theoretical and practical adhesion. (via Semantic Scholar)
Sources: Web Of Science, NC State University Libraries
Added: November 15, 2021

2022 article

Wireless Wearable Electrochemical Sensing Platform with Zero- Power Osmotic Sweat Extraction for Continuous Lactate Monitoring

Saha, T., Songkakul, T., Knisely, C. T., Yokus, M. A., Daniele, M. A., Dickey, M. D., … Velev, O. D. (2022, July 12). ACS SENSORS, Vol. 7.

By: T. Saha n, T. Songkakul n, C. Knisely n, M. Yokus n, M. Daniele n, M. Dickey n, A. Bozkurt n, O. Velev n

author keywords: paper microfluidics; sweat; wearable device; electrochemical sensor; lactate; osmotic pumping; hydrogel
MeSH headings : Humans; Lactic Acid / analysis; Monitoring, Physiologic; Osmosis; Sweat / chemistry; Wearable Electronic Devices
TL;DR: A wearable system combining a hydrogel for osmotic sweat extraction, with a paper microfluidic channel for facilitating sweat transport and management, a screen-printed electrochemical lactate sensor, and a custom-built wireless wearable potentiostat system holds the potential of providing comprehensive and long-term continuous analysis of sweat lactate trends in the human body during rest and under exercising conditions. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Sources: Web Of Science, NC State University Libraries, ORCID
Added: July 13, 2022

2021 article

A Wearable Patch for Prolonged Sweat Lactate Harvesting and Sensing

2021 43RD ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE & BIOLOGY SOCIETY (EMBC), pp. 6863–6866.

By: T. Saha n, J. Fang n, M. Yokus n, S. Mukherjee n, A. Bozkurt n, M. Daniele n, M. Dickey n, O. Velev n

MeSH headings : Humans; Hydrogels; Lactic Acid; Sweat; Sweating; Wearable Electronic Devices
TL;DR: The on-skin performance of a non-invasive wearable sweat sampling patch that can harvest sweat at rest, during exercise, and post-exercise is reported, which can potentially provide useful information about the human metabolic activity. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Sources: Web Of Science, NC State University Libraries
Added: April 25, 2022

2021 journal article

Bioscaffold Stiffness Mediates Aerosolized Nanoparticle Uptake in Lung Epithelial Cells

ACS APPLIED MATERIALS & INTERFACES, 13(43), 50643–50656.

By: A. Williams n, A. Hebert*, R. Boehm*, M. Huddleston*, M. Jenkins*, O. Velev n, M. Nelson*

author keywords: substrate stiffness; endocytosis; engineered materials; cell culture; nanoparticles
MeSH headings : A549 Cells; Aerosols / chemistry; Aerosols / metabolism; Epithelial Cells / chemistry; Epithelial Cells / metabolism; Humans; Interleukin-8 / metabolism; Nanoparticles / chemistry; Nanoparticles / metabolism; Particle Size; Polyurethanes / chemistry; Polyurethanes / metabolism; Surface Properties
TL;DR: In this study, highly porous, ultrasoft polymeric mats mimicking human tissues were formed from novel polyurethane soft dendritic colloids (PU SDCs), a factor found to be critical in analyzing nanomaterial cellular interactions and biological responses. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Sources: Web Of Science, NC State University Libraries
Added: November 23, 2021

2021 journal article

Field-Driven Reversible Alignment and Gelation of Magneto-Responsive Soft Anisotropic Microbeads

JOURNAL OF PHYSICAL CHEMISTRY B, 125(28), 7900–7910.

By: N. Castellanos n, B. Bharti* & O. Velev n

MeSH headings : Anisotropy; Gels; Magnetic Fields; Magnetics; Microspheres
TL;DR: The results prove that the soft magnetic microbeads enable a rich variety of structures and can serve as an experimental toolbox for modeling interactions in dipolar systems leading to various percolated networks, novel magneto-rheological materials, and smart gels. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Sources: Web Of Science, NC State University Libraries
Added: August 9, 2021

2021 journal article

In Vivo Toxicity Assessment of Chitosan-Coated Lignin Nanoparticles in Embryonic Zebrafish (Danio rerio)

NANOMATERIALS, 11(1).

author keywords: toxicology; development; biocompatibility; nanotoxicology; sustainability
TL;DR: E engineered lignin nanoparticle (LNP) coated with chitosan formulations at high concentrations were more toxic than plain LNPs. (via Semantic Scholar)
Sources: ORCID, Web Of Science, NC State University Libraries
Added: January 11, 2021

2021 journal article

Osmotically Enabled Wearable Patch for Sweat Harvesting and Lactate Quantification

MICROMACHINES, 12(12).

By: T. Saha n, J. Fang n, S. Mukherjee n, C. Knisely n, M. Dickey n & O. Velev n

author keywords: paper microfluidics; sweat; sensing; hydrogels; lactate; osmotic pumping; evaporation; capillary; wicking; biochemical assay
TL;DR: The measurements show the that the total number of moles of lactate in sweat is correlated to sweat rate, and sweat appears to be a suitable biofluid for lactate quantification. (via Semantic Scholar)
Sources: ORCID, Web Of Science, NC State University Libraries
Added: December 6, 2021

2021 journal article

Poly(Vinylidene Difluoride) Soft Dendritic Colloids as Li-Ion Battery Separators

JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 168(2).

By: S. Luiso n, A. Williams n, M. Petrecca n, S. Roh*, O. Velev n & P. Fedkiw n

UN Sustainable Development Goal Categories
Sources: Web Of Science, NC State University Libraries, ORCID
Added: January 26, 2021

2021 journal article

Preparation of Reinforced Anisometric Patchy Supraparticles for Self-Propulsion

PARTICLE & PARTICLE SYSTEMS CHARACTERIZATION, 38(6).

By: H. Oguztuerk, L. Bauer*, I. Mantouvalou*, B. Kanngiesser, O. Velev n & M. Gradzielski*

author keywords: anisometric; fumed silica; magnetite; microfibrillated cellulose; platinum catalyst; superhydrophobic
Sources: Web Of Science, NC State University Libraries
Added: May 17, 2021

2021 journal article

Printable homocomposite hydrogels with synergistically reinforced molecular-colloidal networks

Nature Communications, 12(1), 2834.

By: A. Williams n, S. Roh n, A. Jacob n, S. Stoyanov n, L. Hsiao n & O. Velev n

TL;DR: A class of self-reinforced homocomposite hydrogels (HHGs) comprised of interpenetrating networks of multiscale hierarchy with synergistically enforced colloidal-molecular HHGs open up numerous opportunities for formulation of biocompatible gels with robust structure-property relationships. (via Semantic Scholar)
Sources: Web Of Science, NC State University Libraries, Crossref, ORCID
Added: July 6, 2021

2021 journal article

Understanding lignin micro- and nanoparticle nucleation and growth in aqueous suspensions by solvent fractionation

Green Chemistry, 23(2), 1001–1012.

By: J. Zwilling n, X. Jiang n, F. Zambrano n, R. Venditti n, H. Jameel n, O. Velev n, O. Rojas*, R. Gonzalez n

Sources: Web Of Science, NC State University Libraries, ORCID, Crossref
Added: March 15, 2021

2021 journal article

Wearable Osmotic-Capillary Patch for Prolonged Sweat Harvesting and Sensing

ACS APPLIED MATERIALS & INTERFACES, 13(7), 8071–8081.

By: T. Saha n, J. Fang n, S. Mukherjee n, M. Dickey n & O. Velev n

author keywords: sweat bioassay; paper microfluidics; hydrogels; osmotic pumping; lactate
MeSH headings : Biomarkers / analysis; Biosensing Techniques; Humans; Hydrogels / chemistry; Microfluidic Analytical Techniques; Osmotic Pressure; Paper; Skin / chemistry; Sweat / chemistry; Wearable Electronic Devices
TL;DR: In vitro and in vivo sampling of sweat through osmosis via the use of a hydrogel interfaced with the skin, without need for active perspiration is analyzed to highlight that lactate in sweat increases with exercise and as a direct result of muscle activity. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Sources: Web Of Science, NC State University Libraries, ORCID
Added: February 16, 2021

2020 journal article

Active Reversible Swimming of Magnetically Assembled "Microscallops" in Non-Newtonian Fluids

LANGMUIR, 36(25), 7148–7154.

By: K. Han n, C. Shields n, B. Bharti*, P. Arratia* & O. Velev n

TL;DR: The dynamics of "microscallops" made of asymmetric magnetic cubes, which are assembled and actuated using magnetic fields, are investigated and it is found that the direction of propulsion changes with the size and structure of these assemblies. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Sources: Web Of Science, NC State University Libraries
Added: July 20, 2020

2020 journal article

Mechanism and control of "coffee-ring erosion'' phenomena in structurally colored ionomer films

SOFT MATTER, 16(11), 2683–2694.

By: S. Islam n & O. Velev n

TL;DR: It is found that sessile water droplets deposited on these films drive the formation of a rich variety of structures by an evaporation-induced effect of "coffee-ring erosion", and the integrity of these thin polyester films can be significantly improved by thermal densification without any further chemical curing. (via Semantic Scholar)
Sources: Web Of Science, NC State University Libraries
Added: April 14, 2020

2020 journal article

Multiscale Self-Assembly of Distinctive Weblike Structures from Evaporated Drops of Dilute American Whiskeys

ACS NANO, 14(5), 5417–5425.

By: A. Carrithers*, M. Brown*, M. Rashed*, S. Islam n, O. Velev n & S. Williams*

author keywords: self-assembly; colloids; surface monolayers; Marangoni flow; droplet evaporation; whiskey
TL;DR: Data suggest that whiskey webs were unique to diluted American whiskey; however, similar structures were generated with other whiskeys under different conditions, demonstrating that this phenomenon could be used for sample analysis and counterfeit identification. (via Semantic Scholar)
Sources: Web Of Science, NC State University Libraries
Added: June 22, 2020

2020 journal article

Scalable Formation of Concentrated Monodisperse Lignin Nanoparticles by Recirculation-Enhanced Flash Nanoprecipitation

PARTICLE & PARTICLE SYSTEMS CHARACTERIZATION, 37(7).

By: C. Conner n, A. Veleva n, V. Paunov*, S. Stoyanov* & O. Velev n

author keywords: benign nanomaterials; flash nanoprecipitation; monodisperse lignin nanoparticles; scale-up
UN Sustainable Development Goal Categories
2. Zero Hunger (OpenAlex)
Sources: Web Of Science, NC State University Libraries
Added: June 22, 2020

2019 journal article

3D-Printed Silicone Soft Architectures with Programmed Magneto-Capillary Reconfiguration

ADVANCED MATERIALS TECHNOLOGIES, 4(4).

By: S. Roh n, L. Okello n, N. Golbasi n, J. Hankwitz n, J. Liu n, J. Tracy n, O. Velev n

author keywords: additive manufacturing; magnetoactive materials; metamaterials; soft intelligent materials
Sources: Web Of Science, NC State University Libraries, ORCID
Added: May 13, 2019

2019 journal article

Magnetic Actuators: 3D‐Printed Silicone Soft Architectures with Programmed Magneto‐Capillary Reconfiguration (Adv. Mater. Technol. 4/2019)

Advanced Materials Technologies, 4(4), 1970021.

By: S. Roh n, L. Okello n, N. Golbasi n, J. Hankwitz n, J. Liu n, J. Tracy n, O. Velev n

UN Sustainable Development Goal Categories
6. Clean Water and Sanitation (OpenAlex)
Sources: Crossref, NC State University Libraries
Added: February 5, 2020

2019 journal article

Mechanochromic composite elastomers for additive manufacturing and low strain mechanophore activation

POLYMER CHEMISTRY, 10(44), 5985–5991.

UN Sustainable Development Goal Categories
Sources: Web Of Science, NC State University Libraries
Added: December 2, 2019

2019 journal article

Real-time monitoring and control of CHO cell apoptosis by in situ multifrequency scanning dielectric spectroscopy

PROCESS BIOCHEMISTRY, 80, 138–145.

By: F. Ma n, A. Zhang*, D. Chang, O. Velev n, K. Wiltberger* & R. Kshirsagar*

author keywords: Dielectric spectroscopy; Apoptosis; Multi-frequency permittivity; Chinese Hamster Ovary (CHO) cell culture; Fed-batch; Feedback control
TL;DR: The results demonstrate that full-spectrum dielectric spectroscopy can be used as a facile tool for early detection of physiological changes and process adjustment in real-time to enhance bioreactor process productivity and robustness. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Sources: Web Of Science, NC State University Libraries
Added: June 4, 2019

2019 journal article

Soft dendritic microparticles with unusual adhesion and structuring properties

NATURE MATERIALS, 18(12), 1315-+.

By: S. Roh n, A. Williams n, R. Bang n, S. Stoyanov* & O. Velev n

MeSH headings : Adhesiveness; Dendrimers / chemistry; Mechanical Phenomena; Microspheres; Molecular Weight; Polystyrenes / chemistry; Surface Properties
TL;DR: The fabrication of hierarchically structured polymeric microparticles having branched nanofibre coronas with a dendritic morphology is described, which exhibit gelation at very low volume fractions, strong interparticle adhesion and binding into coatings and non-woven sheets. (via Semantic Scholar)
Sources: Web Of Science, NC State University Libraries
Added: December 9, 2019

2018 journal article

Engineering of Self-Propelling Microbots and Microdevices Powered by Magnetic and Electric Fields

ADVANCED FUNCTIONAL MATERIALS, 28(25).

By: K. Han n, C. Shields n & O. Velev n

author keywords: active colloids; autonomous locomotion microbots; engineered particles; self-propelling particles
UN Sustainable Development Goal Categories
7. Affordable and Clean Energy (OpenAlex)
Sources: Web Of Science, NC State University Libraries
Added: August 6, 2018

2018 journal article

Formation of periodic size-segregated stripe pattern via directed self-assembly of binary colloids and its mechanism

APPLIED SURFACE SCIENCE, 435, 512–520.

By: S. Das*, E. Duraia*, O. Velev n, M. Amiri* & G. Beall*

author keywords: Convective assembly; Periodic stripe pattern; Binary colloids; Size segregation
Sources: Web Of Science, NC State University Libraries
Added: August 6, 2018

2018 journal article

Nanomaterials Fabrication by Interfacial Templating and Capillary Engineering in Multiphasic Liquids

AICHE JOURNAL, 64(10), 3558–3564.

By: S. Roh n & O. Velev n

author keywords: polymer nanomaterials; soft matter; capillary paste; 3-D printing; smart gels
Sources: Web Of Science, NC State University Libraries
Added: October 19, 2018

2018 journal article

Probing Contaminant-Induced Alterations in Chlorophyll Fluorescence by AC-Dielectrophoresis-Based 2D-Algal Array

BIOSENSORS-BASEL, 8(1).

By: C. Siebman*, O. Velev n & V. Slaveykova*

author keywords: whole cell array; dielectrophoresis; flow cytometry; chlorophyll fluorescence; copper; copper oxide nanoparticles; mercury; Chlamydomonas reinhardtii
MeSH headings : Biosensing Techniques / instrumentation; Biosensing Techniques / methods; Chlamydomonas reinhardtii / cytology; Chlamydomonas reinhardtii / drug effects; Chlamydomonas reinhardtii / metabolism; Chlorophyll / analysis; Chlorophyll / metabolism; Copper / metabolism; Environmental Pollutants / metabolism; Equipment Design; Fluorescence; Microscopy, Fluorescence / instrumentation; Microscopy, Fluorescence / methods; Nanoparticles / metabolism; Tissue Array Analysis / instrumentation; Tissue Array Analysis / methods
TL;DR: Overall, DEP-based 2D-arrays of algal cells with fluorescence detection appear to be suitable for stain-free probing the effects on the photosynthetic microorganisms in highly polluted environment. (via Semantic Scholar)
Sources: Web Of Science, NC State University Libraries
Added: August 6, 2018

2018 journal article

Propulsion and assembly of remotely powered p-type silicon microparticles

APL MATERIALS, 6(12).

By: U. Ohiri*, K. Han n, C. Shields n, O. Velev n & N. Jokerst*

UN Sustainable Development Goal Categories
Sources: Web Of Science, NC State University Libraries
Added: January 14, 2019

2018 journal article

Reconfigurable engineered motile semiconductor microparticles

NATURE COMMUNICATIONS, 9.

By: U. Ohiri*, C. Shields*, K. Han*, T. Tyler*, O. Velev* & N. Jokerst*

TL;DR: Controlled, collective behavior in silicon microparticles, which are fabricated via conventional semiconductor methods are demonstrated, which may enable advanced applications that include remotely powered microsensors, artificial muscles, reconfigurable neural networks and computational systems. (via Semantic Scholar)
UN Sustainable Development Goal Categories
7. Affordable and Clean Energy (OpenAlex)
Sources: Web Of Science, NC State University Libraries
Added: August 6, 2018

2018 journal article

Revisiting the colloidal fundamentals of water-dispersible polyesters: interactions and self-assembly of polymer nanoaggregates in water

SOFT MATTER, 14(11), 2118–2130.

By: S. Islam n, D. Inglefield* & O. Velev n

TL;DR: A model for nanoaggregate formation in water based on the critical surface charge density of these nanoparticles is presented, which may enable the design of novel high-performance surfactant-free waterborne dispersion systems. (via Semantic Scholar)
UN Sustainable Development Goal Categories
6. Clean Water and Sanitation (OpenAlex)
Sources: Web Of Science, NC State University Libraries
Added: August 6, 2018

2018 journal article

Soft electrodes combining hydrogel and liquid metal

SOFT MATTER, 14(17), 3296–3303.

By: T. Shay n, O. Velev n & M. Dickey n

TL;DR: It is shown it is possible to interface hydrogel with liquid metal (eutectic gallium indium, EGaIn) electrodes to create completely soft and deformable electrodes that provide low resistance traces through the gel without altering its mechanical properties. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Sources: Web Of Science, NC State University Libraries, ORCID
Added: August 6, 2018

2018 journal article

Stabilization of oil continuous emulsions with colloidal particles from water-insoluble plant proteins

FOOD HYDROCOLLOIDS, 82, 89–95.

By: M. Rutkevicius n, S. Allred n, O. Velev n & K. Velikov*

UN Sustainable Development Goal Categories
Sources: Web Of Science, NC State University Libraries
Added: October 19, 2018

2018 journal article

Supercolloidal Spinners: Complex Active Particles for Electrically Powered and Switchable Rotation

ADVANCED FUNCTIONAL MATERIALS, 28(35).

By: C. Shields n, K. Han n, F. Ma n, T. Miloh*, G. Yossifon* & O. Velev n

author keywords: electrically powered particles; engineered active particles; particle rotors; self-propelling particles; switchable rotation
UN Sustainable Development Goal Categories
7. Affordable and Clean Energy (OpenAlex)
Sources: Web Of Science, NC State University Libraries
Added: October 19, 2018

2018 journal article

Toxicological Assessment of a Lignin Core Nanoparticle Doped with Silver as an Alternative to Conventional Silver Core Nanoparticles

ANTIBIOTICS-BASEL, 7(2).

By: C. Nix*, B. Harper*, C. Conner n, A. Richter n, O. Velev n & S. Harper*

author keywords: nanotechnology; environmentally-friendly; pesticide; antimicrobial; zebrafish
TL;DR: Overall, the study indicates that the lignin core is an effective alternative to conventional solid core AgNPs for potentially reducing the burden of silver released into the environment from a variety of consumer products. (via Semantic Scholar)
Sources: Web Of Science, ORCID, NC State University Libraries
Added: August 6, 2018

2017 journal article

3D Printing by Multiphase Silicone/Water Capillary Inks

ADVANCED MATERIALS, 29(30).

By: S. Roh n, D. Parekh n, B. Bharti*, S. Stoyanov* & O. Velev n

TL;DR: This study demonstrates a new efficient technique for 3D printing with PDMS by using a capillary suspension ink containing PDMS in the form of both precured microbeads and uncured liquid precursor, dispersed in water as continuous medium. (via Semantic Scholar)
Sources: Web Of Science, NC State University Libraries
Added: August 6, 2018

2017 journal article

Alternating current-dielectrophoresis collection and chaining of phytoplankton on chip: Comparison of individual species and artificial communities

Biosensors, 7(1).

By: C. Siebman*, O. Velev n & V. Slaveykova*

Contributors: C. Siebman*, O. Velev n & V. Slaveykova*

author keywords: AC dielectrophoresis; chaining efficiency; green algae; cyanobacteria; diatom; phytoplankton; freshwater
MeSH headings : Biosensing Techniques / instrumentation; Cell Polarity; Chlamydomonas reinhardtii / physiology; Diatoms / physiology; Fresh Water / microbiology; Lab-On-A-Chip Devices / microbiology; Phytoplankton / physiology; Synechocystis / physiology; Water Quality
TL;DR: The results prove the potential of DEP to discriminate different phytoplankton species depending on their effective polarizability and to enable their manipulation, such as specific collection or separation in freshwater. (via Semantic Scholar)
Sources: ORCID, NC State University Libraries, NC State University Libraries
Added: August 6, 2018

2017 article

Biocoatings: challenges to expanding the functionality of waterborne latex coatings by incorporating concentrated living microorganisms

Flickinger, M. C., Bernal, O. I., Schulte, M. J., Broglie, J. J., Duran, C. J., Wallace, A., … Velev, O. D. (2017, July). JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 14, pp. 791–808.

By: M. Flickinger n, O. Bernal n, M. Schulte n, J. Broglie n, C. Duran n, A. Wallace n, C. Mooney n, O. Velev n

author keywords: Biocoatings; Biocatalysts; Waterborne coating functionality; Nanoporous coatings; Engineered microbes in coatings; Bioabsorbers; Desiccation tolerance
UN Sustainable Development Goal Categories
6. Clean Water and Sanitation (Web of Science; OpenAlex)
Sources: Web Of Science, NC State University Libraries
Added: August 6, 2018

2017 journal article

Chained Iron Microparticles for Directionally Controlled Actuation of Soft Robots

ACS APPLIED MATERIALS & INTERFACES, 9(13), 11895–11901.

By: M. Schmauch*, S. Mishra*, B. Evans*, O. Velevt & J. Tracy*

Contributors: M. Schmauch*, S. Mishra*, B. Evans*, O. Velevt & J. Tracy*

author keywords: magnetic particles; chains; elastomer; anisotropy; actuation; lifter; valve; pump
TL;DR: The "specific torque", the torque per field per mass of magnetic particles, is introduced as a figure of merit for assessing and comparing the performance of lifters and related devices. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Sources: Web Of Science, NC State University Libraries, ORCID
Added: August 6, 2018

2017 journal article

Controlled Formation of Patchy Anisometric Fumed Silica Supraparticles in Droplets on Bent Superhydrophobic Surfaces

Particle and Particle Systems Characterization, 34(1).

Contributors: M. Sperling*, V. Spiering*, O. Velev n & M. Gradzielski*

author keywords: anisometric; evaporation; patchy; silica; superhydrophobic surfaces
Source: ORCID
Added: March 21, 2019

2017 journal article

Design and characterization of hydrogel-based microfluidic devices with biomimetic solute transport networks

BIOMICROFLUIDICS, 11(2).

By: H. Koo* & O. Velev n

Contributors: H. Koo* & O. Velev n

TL;DR: This work defines three key designs of microfluidic-hydrogel devices, having linear, T-shaped, and branched channels, and reports results of numerical simulation of the process of their infusion with solute carried by the incoming fluid. (via Semantic Scholar)
Sources: Web Of Science, ORCID, NC State University Libraries
Added: August 6, 2018

2017 journal article

Fabrication of Photoreactive Biocomposite Coatings via Electric Field-Assisted Assembly of Cyanobacteria

Langmuir, 33(21), 5304–5313.

By: O. Bernal, B. Bharti*, M. Flickinger* & O. Velev*

MeSH headings : Biocompatible Materials; Biomimetics; Cell Survival; Cyanobacteria; Polyesters
TL;DR: The assembly of structured cyanobacteria coatings that optimize cell surface coverage and preserve cell viability after immobilization are achieved, a step toward the development of flexible multilayered cell-based photoabsorbing biomaterials that can serve as components of "biomimetic leaves" for utilizing solar energy to recycle CO2 into fuels or chemicals. (via Semantic Scholar)
UN Sustainable Development Goal Categories
7. Affordable and Clean Energy (OpenAlex)
Sources: Crossref, NC State University Libraries, NC State University Libraries
Added: August 6, 2018

2017 journal article

Hydrogel-enabled osmotic pumping for microfluidics: towards wearable human-device interfaces

LAB ON A CHIP, 17(4), 710–716.

By: T. Shay n, M. Dickey n & O. Velev n

Contributors: T. Shay n, M. Dickey n & O. Velev n

MeSH headings : Equipment Design; Glucose / analysis; Humans; Hydrogels / chemistry; Lab-On-A-Chip Devices; Membranes, Artificial; Microfluidic Analytical Techniques / instrumentation; Microfluidic Analytical Techniques / methods; Models, Biological; Osmosis; Sweat / chemistry; Wearable Electronic Devices
TL;DR: Initial testing has shown the device can pump accurate levels of glucose across the membrane and through a microchannel to a reservoir with a glucose sensor, and Sensors and electrodes can be implemented in future microfluidic devices operating on these principles. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Sources: Web Of Science, ORCID, NC State University Libraries
Added: August 6, 2018

2017 journal article

Investigation of interfacial properties of pure and mixed poloxamers for surfactant-mediated shear protection of mammalian cells

COLLOIDS AND SURFACES B-BIOINTERFACES, 156, 358–365.

By: D. Chang n, R. Fox n, E. Hicks n, R. Ferguson*, K. Chang*, D. Osborne*, W. Hu*, O. Velev n

author keywords: Poloxamer; Mammalian cells; Shear sensitivity; Interfacial tension; Foam stability; Bioreactors
MeSH headings : Animals; CHO Cells; Cell Survival / drug effects; Cells, Cultured; Cricetulus; Poloxamer / chemistry; Poloxamer / pharmacology; Surface Tension; Surface-Active Agents / chemistry; Surface-Active Agents / pharmacology
TL;DR: The mechanism of disruption by P407 was determined to be independent of cell-to-bubble attachment, suggesting that poloxamer adsorption to and subsequent reinforcement of the cell membrane may play a key role in protecting cells in high shear environments. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Sources: Web Of Science, NC State University Libraries
Added: August 6, 2018

2017 journal article

Reduction of defects in self-assembling colloidal monolayer via surface modifiers and periodic mechanical vibration

SURFACE & COATINGS TECHNOLOGY, 319, 353–358.

By: S. Das*, E. Duraia*, O. Velev n, J. Gatabi* & G. Beall*

author keywords: Convective assembly; Nano spheres; Monolayer; Periodic vibrations; Defect reduction
Sources: Web Of Science, NC State University Libraries
Added: August 6, 2018

2017 journal article

Sequence-encoded colloidal origami and microbot assemblies from patchy magnetic cubes

SCIENCE ADVANCES, 3(8).

By: K. Han n, C. Shields*, N. Diwakar*, B. Bharti n, G. Lopez* & O. Velev n

MeSH headings : Algorithms; Biomimetic Materials; Colloids / chemistry; Magnetic Fields; Models, Theoretical
Sources: Web Of Science, NC State University Libraries
Added: August 6, 2018

2017 journal article

Simulation study on the structural properties of colloidal particles with offset dipoles

SOFT MATTER, 13(17), 3134–3146.

By: D. Rutkowski n, O. Velev n, S. Klapp* & C. Hall n

TL;DR: Results from quasi-2D Monte Carlo simulations of systems of colloidal particles with offset transversely-oriented extended dipole-like charge distributions interacting via an intermediate-ranged Yukawa potential are described, finding that the effective cooling rate in these simulations has an impact on the structures formed. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Sources: Web Of Science, NC State University Libraries
Added: August 6, 2018

2017 review

The Evolution of Active Particles: Toward Externally Powered Self-Propelling and Self-Reconfiguring Particle Systems

[Review of ]. CHEM, 3(4), 539–559.

By: C. Shields n & O. Velev n

TL;DR: How active particles have evolved as a result of advances in particle fabrication is discussed by analyzing the relationship between their design and mechanism of self-propulsion. (via Semantic Scholar)
UN Sustainable Development Goal Categories
7. Affordable and Clean Energy (OpenAlex)
Sources: Web Of Science, NC State University Libraries
Added: August 6, 2018

2016 journal article

Active Steerable Catalytic Supraparticles Shuttling on Preprogrammed Vertical Trajectories

ADVANCED MATERIALS INTERFACES, 3(15).

Contributors: M. Sperling*, H. Kim n, O. Velev n & M. Gradzielski*

UN Sustainable Development Goal Categories
Sources: Web Of Science, ORCID, NC State University Libraries
Added: August 6, 2018

2016 article

Active particles propelled into researchers' focus

Abbott, N. L., & Velev, O. D. (2016, February). CURRENT OPINION IN COLLOID & INTERFACE SCIENCE, Vol. 21, pp. 1–3.

By: N. Abbott* & O. Velev n

Contributors: N. Abbott* & O. Velev n

UN Sustainable Development Goal Categories
Sources: Web Of Science, ORCID, NC State University Libraries
Added: August 6, 2018

2016 journal article

Bending of Responsive Hydrogel Sheets Guided by Field-Assembled Microparticle Endoskeleton Structures

SMALL, 12(17), 2283–2290.

By: D. Morales n, B. Bharti n, M. Dickey n & O. Velev n

Contributors: D. Morales n, B. Bharti n, M. Dickey n & O. Velev n

MeSH headings : Biomimetics; Hydrogels; Particle Size; Robotics
TL;DR: Hydrogel composites that respond to stimuli can form the basis of new classes of biomimetic actuators and soft robotic components that guide the macroscopic bending pattern of the actuators. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Sources: Web Of Science, ORCID, NC State University Libraries
Added: August 6, 2018

2016 journal article

Capillary Bridging as a Tool for Assembling Discrete Clusters of Patchy Particles

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 138(45), 14948–14953.

By: B. Bharti n, D. Rutkowski n, K. Han n, A. Kumar n, C. Hall n & O. Velev n

Contributors: B. Bharti n, D. Rutkowski n, K. Han n, A. Kumar n, C. Hall n & O. Velev n

TL;DR: This study demonstrates the ability of capillary bridging as a versatile tool to assemble thermoresponsive clusters and aggregates and can be extended further to assemble particles with nonspherical shapes and complex surface chemistries enabling the formation of sophisticated colloidal molecules. (via Semantic Scholar)
Sources: Web Of Science, ORCID, NC State University Libraries
Added: August 6, 2018

2016 journal article

Dissolution behaviour of ferric pyrophosphate and its mixtures with soluble pyrophosphates: Potential strategy for increasing iron bioavailability

FOOD CHEMISTRY, 208, 97–102.

By: T. Tian n, E. Blanco n, S. Smoukov*, O. Velev n & K. Velikov*

Contributors: T. Tian n, E. Blanco n, S. Smoukov*, O. Velev n & K. Velikov*

author keywords: Iron pyrophosphate; Food fortification; Iron supplementation; Iron bioavailability
MeSH headings : Beverages; Biological Availability; Dietary Supplements; Diphosphates / chemistry; Food, Fortified; Humans; Iron / chemistry; Solubility
TL;DR: In the presence of pyrophosphate ions the solubility of FePP strongly increases at pH 5-8.5, which leads to an 8-10-fold increase in the total ionic iron concentration, beneficial for enhancing iron bioavailability, which important for the design of fortified food, beverages, and nutraceutical products. (via Semantic Scholar)
UN Sustainable Development Goal Categories
2. Zero Hunger (OpenAlex)
Sources: Web Of Science, ORCID, NC State University Libraries
Added: August 6, 2018

2016 journal article

Ionoprinted Multi-Responsive Hydrogel Actuators

MICROMACHINES, 7(6).

By: D. Morales n, I. Podolsky n, R. Mailen n, T. Shay n, M. Dickey n & O. Velev n

Contributors: D. Morales n, I. Podolsky n, R. Mailen n, T. Shay n, M. Dickey n & O. Velev n

author keywords: hydrogel actuators; soft robotics; stimuli responsive systems; ionoprinting; pNIPAAm
UN Sustainable Development Goal Categories
6. Clean Water and Sanitation (OpenAlex)
Sources: Web Of Science, ORCID, NC State University Libraries
Added: August 6, 2018

2016 journal article

Multidirectional colloidal assembly in concurrent electric and magnetic fields

SOFT MATTER, 12(37), 7747–7758.

By: B. Bharti n, F. Kogler*, C. Hall n, S. Klapp* & O. Velev n

Contributors: B. Bharti n, F. Kogler*, C. Hall n, S. Klapp* & O. Velev n

TL;DR: This novel methodology of introducing and interpreting double-dipolar particle interactions may assist in the assembly of colloidal coatings, dynamically reconfigurable particle networks, and bidirectional active structures. (via Semantic Scholar)
UN Sustainable Development Goal Categories
7. Affordable and Clean Energy (OpenAlex)
13. Climate Action (Web of Science)
Sources: Web Of Science, ORCID, NC State University Libraries
Added: August 6, 2018

2016 journal article

Organic-inorganic patchy particles as a versatile platform for fluid-in-fluid dispersion stabilisation

FARADAY DISCUSSIONS, 191, 73–88.

By: E. Blanco n, S. Smoukov n, O. Velev n & K. Velikov*

Contributors: E. Blanco n, S. Smoukov n, O. Velev n & K. Velikov*

TL;DR: Protein-based organic-inorganic surface heterogeneous particles represent a new versatile platform for the stabilization of fluid-in-fluid dispersions and as precursors for the assembly of advanced functional materials. (via Semantic Scholar)
UN Sustainable Development Goal Categories
6. Clean Water and Sanitation (OpenAlex)
Sources: Web Of Science, ORCID, NC State University Libraries
Added: August 6, 2018

2016 journal article

Role of network geometry on fluid displacement in microfluidic color-changing windows

SMART STRUCTURES AND SYSTEMS, 18(5), 865–884.

By: A. Ucar*, O. Velev* & H. Koo

Contributors: A. Uçar*, O. Velev* & H. Koo

author keywords: COMSOL simulation; microfluidic network; flow uniformity; liquid displacement efficiency; color-changing smart windows
UN Sustainable Development Goal Categories
13. Climate Action (Web of Science)
Sources: Web Of Science, ORCID, NC State University Libraries
Added: August 6, 2018

2016 journal article

Selective and directional actuation of elastomer films using chained magnetic nanoparticles

NANOSCALE, 8(3), 1309–1313.

By: S. Mishra n, M. Dickey n, O. Velev n & J. Tracy n

Contributors: S. Mishra n, M. Dickey n, O. Velev n & J. Tracy n

TL;DR: Selective and directional actuation of elastomer films utilizing magnetic anisotropy introduced by chains of Fe3O4 magnetic nanoparticles (MNPs) is reported. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Sources: Web Of Science, ORCID, NC State University Libraries
Added: August 6, 2018

2016 journal article

Synthesis and characterization of biodegradable lignin nanoparticles with tunable surface properties

Langmuir, 32(25), 6468–6477.

By: A. Richter n, B. Bharti n, H. Armstrong n, J. Brown n, D. Plemmons n, V. Paunov*, S. Stoyanov*, O. Velev n

Contributors: A. Richter n, B. Bharti n, H. Armstrong n, J. Brown n, D. Plemmons n, V. Paunov*, S. Stoyanov*, O. Velev n

TL;DR: The data show that the properties of the nanoparticles are governed by the type of lignin used and the presence of polyelectrolyte surface coating, and how the colloidal stability and dispersion properties of these two types of nanoparticles vary as a function of pH and salinities. (via Semantic Scholar)
Sources: ORCID, NC State University Libraries, NC State University Libraries
Added: August 6, 2018

2016 journal article

The effect of charge separation on the phase behavior of dipolar colloidal rods

SOFT MATTER, 12(22), 4932–4943.

By: D. Rutkowski n, O. Velev n, S. Klapp* & C. Hall n

Contributors: D. Rutkowski n, O. Velev n, S. Klapp* & C. Hall n

TL;DR: This work has simulated a system of dipolar colloidal rods at fixed aspect ratio using discontinuous molecular dynamics (DMD) to investigate how the charge separation of an embedded dipole affects the types of assemblies that occur. (via Semantic Scholar)
Sources: Web Of Science, ORCID, NC State University Libraries
Added: August 6, 2018

2015 journal article

An environmentally benign antimicrobial nanoparticle based on a silver-infused lignin core

NATURE NANOTECHNOLOGY, 10(9), 817-+.

By: A. Richter n, J. Brown n, B. Bharti n, A. Wang*, S. Gangwal*, K. Houck*, E. Hubal*, V. Paunov* ...

MeSH headings : Animals; Anti-Infective Agents / chemistry; Anti-Infective Agents / pharmacology; Anti-Infective Agents / toxicity; Bacteria / drug effects; Cell Line; Cell Survival / drug effects; Colony Count, Microbial; Embryo, Nonmammalian / drug effects; High-Throughput Screening Assays; Humans; Lignin / chemistry; Lignin / toxicity; Microbial Viability / drug effects; Nanoparticles / chemistry; Nanoparticles / toxicity; Rats; Silver / chemistry; Silver / pharmacology; Silver / toxicity; Zebrafish
TL;DR: It is shown that lignin nanoparticles infused with silver ions and coated with a cationic polyelectrolyte layer form a biodegradable and green alternative to silver nanoparticles. (via Semantic Scholar)
UN Sustainable Development Goal Categories
15. Life on Land (OpenAlex)
Sources: Web Of Science, ORCID, NC State University Libraries
Added: August 6, 2018

2015 journal article

Artificial leaf device for hydrogen generation from immobilised C. reinhardtii microalgae

JOURNAL OF MATERIALS CHEMISTRY A, 3(41), 20698–20707.

By: A. Das*, M. Esfahani*, O. Velev n, N. Pamme* & V. Paunov*

Contributors: A. Das*, M. Esfahani*, O. Velev n, N. Pamme* & V. Paunov*

TL;DR: A fully biomimetic leaf-like device for hydrogen production which allows incorporated fabric-immobilised microalgae culture to be simultaneously hydrated with media and harvested from the produced hydrogen in a continuous flow regime without the need to replace the algal culture. (via Semantic Scholar)
Sources: Web Of Science, ORCID, NC State University Libraries
Added: August 6, 2018

2015 journal article

Assembly of Reconfigurable Colloidal Structures by Multidirectional Field-Induced Interactions

Langmuir, 31(29), 7897–7908.

By: B. Bharti n & O. Velev n

Contributors: B. Bharti n & O. Velev n

MeSH headings : Anisotropy; Colloids / chemistry; Electricity; Magnetic Fields; Nanostructures / chemistry; Particle Size
TL;DR: It is discussed how directional polarization interactions induced by external electric and magnetic fields can be used to assemble complex particles or particle mixtures into lattices of tailored structure. (via Semantic Scholar)
UN Sustainable Development Goal Categories
13. Climate Action (Web of Science)
Sources: ORCID, NC State University Libraries, NC State University Libraries
Added: August 6, 2018

2015 journal article

Characterization and control of surfactant-mediated Norovirus interactions

SOFT MATTER, 11(44), 8621–8631.

By: B. Mertens n & O. Velev n

Contributors: B. Mertens n & O. Velev n

MeSH headings : Colloids / chemistry; Hydrogen-Ion Concentration; Norovirus / chemistry; Norovirus / drug effects; Protein Aggregates; Static Electricity; Surface-Active Agents / chemistry; Surface-Active Agents / pharmacology; Vaccines, Virus-Like Particle / chemistry; Vaccines, Virus-Like Particle / drug effects
TL;DR: Zeta potential data is used to characterize virus surface charge and interpret the mechanisms behind these demonstrated surfactant-virus interactions, which will aid in practical formulations for virus inactivation and removal from contaminated surfaces. (via Semantic Scholar)
UN Sustainable Development Goal Categories
6. Clean Water and Sanitation (OpenAlex)
Sources: Web Of Science, ORCID, NC State University Libraries
Added: August 6, 2018

2015 conference paper

Directed assembly at all length scales: The pathway towards future metamaterials

Education Division 2015 - Core Programming Area at the 2015 AIChE Annual Meeting. http://www.scopus.com/inward/record.url?eid=2-s2.0-84968820806&partnerID=MN8TOARS

By: B. Bharti, G. Findenegg & O. Velev

Contributors: B. Bharti, G. Findenegg & O. Velev

Source: ORCID
Added: March 21, 2019

2015 journal article

Field-assisted self-assembly process: General discussion

Faraday Discussions, 181, 463–479.

By: Y. Sun, L. Scarabelli, N. Kotov, M. Tebbe, X. Lin, W. Brullot, L. Isa, P. Schurtenberger ...

Contributors: Y. Sun, L. Scarabelli, N. Kotov, M. Tebbe, X. Lin, W. Brullot, L. Isa, P. Schurtenberger ...

TL;DR: Yugang Sun, Leonardo Scarabelli, Nicholas Kotov, Moritz Tebbe, Xiao-Min Lin, Ward Brullot, Lucio Isa, Peter Schurtenberger, Helmuth Moehwald, Igor Fedin, Orlin Velev, Damien Faivre, Christopher Sorensen, Regine Perzynski, Munish Chanana, Zhihai Li and Suvojit Ghosh. (via Semantic Scholar)
Source: ORCID
Added: March 21, 2019

2015 journal article

Field-assisted self-assembly process: general discussion

Faraday Discussions, 181, 463–479.

By: Y. Sun, L. Scarabelli, N. Kotov, M. Tebbe, X. Lin, W. Brullot, L. Isa, P. Schurtenberger ...

Source: NC State University Libraries
Added: August 6, 2018

2015 journal article

Formation of Anisometric Fumed Silica Supraparticles - Mechanism and Application Potential

ZEITSCHRIFT FUR PHYSIKALISCHE CHEMIE-INTERNATIONAL JOURNAL OF RESEARCH IN PHYSICAL CHEMISTRY & CHEMICAL PHYSICS, 229(7-8), 1055–1074.

By: M. Sperling*, O. Velev n & M. Gradzielski*

Contributors: M. Sperling*, O. Velev n & M. Gradzielski*

author keywords: Anisometric Particles; Fumed Silica; Evaporation; Self-Assembly; Droplets; Superhydrophobic Surface
Sources: Web Of Science, ORCID, NC State University Libraries
Added: August 6, 2018

2015 journal article

Generic model for tunable colloidal aggregation in multidirectional fields

SOFT MATTER, 11(37), 7356–7366.

By: F. Kogler*, O. Velev n, C. Hall n & S. Klapp*

Contributors: F. Kogler*, O. Velev n, C. Hall n & S. Klapp*

TL;DR: A model which allows continuous change in the particle interactions from point-dipole-like to patchy-like (with four patches) is proposed, and it is shown that the non-equilibrium aggregation occurring at low densities and temperatures transforms from conventional diffusion-limited cluster aggregation (DLCA) to slippery DLCA involving rotating bonds. (via Semantic Scholar)
Sources: Web Of Science, ORCID, NC State University Libraries
Added: August 6, 2018

2015 journal article

Magnetophoretic assembly of flexible nanoparticles/lipid microfilaments

FARADAY DISCUSSIONS, 181, 437–448.

By: B. Bharti n, A. Fameau & O. Velev n

Contributors: B. Bharti n, A. Fameau & O. Velev n

MeSH headings : Lipids / chemistry; Magnetics; Nanoparticles / chemistry
TL;DR: This study characterize and analyse the mechanism of the magnetic field driven assembly of lipid-coated iron oxide nanoparticles into flexible microfilaments and demonstrates that surface stickiness combined with the magnetic response of the filaments can be used further to twist, bend and bundle the microfilament structure. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Sources: Web Of Science, ORCID, NC State University Libraries
Added: August 6, 2018

2015 journal article

Multidirectional, Multicomponent Electric Field Driven Assembly of Complex Colloidal Chains

ZEITSCHRIFT FUR PHYSIKALISCHE CHEMIE-INTERNATIONAL JOURNAL OF RESEARCH IN PHYSICAL CHEMISTRY & CHEMICAL PHYSICS, 229(7-8), 1075–1088.

By: B. Bharti n & O. Velev n

Contributors: B. Bharti n & O. Velev n

author keywords: Directed Assembly; Dielectrophoresis; Colloids; Field Driven Assembly
UN Sustainable Development Goal Categories
Sources: Web Of Science, ORCID, NC State University Libraries
Added: August 6, 2018

2015 journal article

Nanocapillarity-mediated magnetic assembly of nanoparticles into ultraflexible filaments and reconfigurable networks

NATURE MATERIALS, 14(11), 1104-+.

By: B. Bharti n, A. Fameau*, M. Rubinstein* & O. Velev n

Contributors: B. Bharti n, A. Fameau*, M. Rubinstein* & O. Velev n

MeSH headings : DNA / chemistry; Magnetite Nanoparticles / chemistry; Magnetite Nanoparticles / ultrastructure; Models, Chemical
TL;DR: Capillarity-mediated binding between magnetic nanoparticles coated with a liquid lipid shell can be used for the assembly of ultraflexible microfilaments and network structures that can be magnetically regenerated on mechanical damage. (via Semantic Scholar)
Sources: Web Of Science, ORCID, NC State University Libraries
Added: August 6, 2018

2015 journal article

New routes to control nanoparticle synthesis: General discussion

Faraday Discussions, 181, 147–179.

By: J. Reguera, L. Scarabelli, C. Petit, R. Siramdas, H. Wolf, M. Chanana, X. Liu, M. Martin ...

Contributors: J. Reguera, L. Scarabelli, C. Petit, R. Siramdas, H. Wolf, M. Chanana, X. Liu, M. Martin ...

TL;DR: This competition aims to provide a platform for the development of a new generation of negotiators and facilitators of human rights in the Middle East. (via Semantic Scholar)
Source: ORCID
Added: March 21, 2019

2015 journal article

Remote Steering of Self-Propelling Microcircuits by Modulated Electric Field

ADVANCED FUNCTIONAL MATERIALS, 25(34), 5512–5519.

By: R. Sharma n & O. Velev n

Contributors: R. Sharma n & O. Velev n

author keywords: active particles; alternating (AC) electrohydrodynamics; duty cycle modulation; microswimmers; remote steering; self-propelling diodes
UN Sustainable Development Goal Categories
7. Affordable and Clean Energy (OpenAlex)
Sources: Web Of Science, ORCID, NC State University Libraries
Added: August 6, 2018

2015 journal article

Scalable Liquid Shear-Driven Fabrication of Polymer Nanofibers

ADVANCED MATERIALS, 27(16), 2642–2647.

By: S. Smoukov n, T. Tian n, N. Vitchuli*, S. Gangwal n, P. Geisen*, M. Wright*, E. Shim n, M. Marquez* ...

Contributors: S. Smoukov n, T. Tian n, N. Vitchuli*, S. Gangwal n, P. Geisen*, M. Wright*, E. Shim n, M. Marquez*, J. Fowler*, O. Velev n

author keywords: antisolvents; composite nanofibers; liquid shearing; nanofibers; nanoribbons
MeSH headings : Chloroform / chemistry; Ethanol / chemistry; Glycerol / chemistry; Lactic Acid / chemistry; Magnetite Nanoparticles / chemistry; Nanofibers / chemistry; Nanotechnology / methods; Polyesters; Polymers / chemical synthesis; Polymers / chemistry; Sodium Hydroxide / chemistry; Solvents / chemistry; Viscosity; Water / chemistry
TL;DR: A simple process for batch or continuous formation of polymer nanofibers and other nanomaterials in the bulk of a sheared fluid medium is introduced and may be of high value to commercial nanotechnology, as it can be easily scaled up to the fabrication of staple nanofiber at rates that may exceed tens of kilograms per hour. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Sources: Web Of Science, ORCID, NC State University Libraries
Added: August 6, 2018

2015 journal article

Smart Nonaqueous Foams from Lipid-Based Oleogel

Langmuir, 31(50), 13501–13510.

By: A. Fameau*, S. Lam n, A. Arnould*, C. Gaillard*, O. Velev n & A. Saint-Jalmes*

Contributors: A. Fameau*, S. Lam n, A. Arnould*, C. Gaillard*, O. Velev n & A. Saint-Jalmes*

MeSH headings : Fatty Alcohols / chemistry; Lipids / chemistry; Organic Chemicals / chemistry; Particle Size; Plant Oils / chemistry; Sunflower Oil; Surface Properties; Temperature
TL;DR: A simple way to produce oil foams from oleogels, whose liquid phase is a mixture of sunflower oil and fatty alcohols, that can be made to be photoresponsive by using internal heat sources such as carbon black particles, which can absorb UV light and dissipate the absorbed energy as heat. (via Semantic Scholar)
Sources: ORCID, NC State University Libraries, NC State University Libraries
Added: August 6, 2018

2015 journal article

The dynamics and stability of lubricating oil films during droplet transport by electrowetting in microfluidic devices

BIOMICROFLUIDICS, 9(3).

By: J. Kleinert n, V. Srinivasan*, A. Rival*, C. Delattre*, O. Velev n & V. Pamula*

Contributors: J. Kleinert n, V. Srinivasan*, A. Rival*, C. Delattre*, O. Velev n & V. Pamula*

TL;DR: A comprehensive understanding of the oil film behavior will enable more robust electrowetting-actuated lab-on-a-chip devices through prevention of loss of species from droplets and contamination of surfaces at points where films may break. (via Semantic Scholar)
UN Sustainable Development Goal Categories
6. Clean Water and Sanitation (OpenAlex)
Sources: Web Of Science, ORCID, NC State University Libraries
Added: August 6, 2018

2015 journal article

Two-dimensional algal collection and assembly by combining AC-dielectrophoresis with fluorescence detection for contaminant-induced oxidative stress sensing

Biosensors, 5(2), 319–336.

By: C. Siebman*, O. Velev n & V. Slaveykova*

Contributors: C. Siebman*, O. Velev n & V. Slaveykova*

author keywords: whole cell assembly; dielectrophoresis; fluorescence; contamination; reactive oxygen species; Chlamydomonas reinhardtii
MeSH headings : Biosensing Techniques / instrumentation; Biosensing Techniques / methods; Chlamydomonas reinhardtii / drug effects; Chlamydomonas reinhardtii / physiology; Copper / toxicity; Electrophoresis; Lab-On-A-Chip Devices / microbiology; Metal Nanoparticles / toxicity; Methylmercury Compounds / toxicity; Microscopy, Fluorescence; Oxidative Stress; Reactive Oxygen Species / metabolism; Water Pollutants, Chemical / toxicity
TL;DR: The potential of combining AC-dielectrophoretically assembled two-dimensional algal structures with cell metabolic analysis using fluorescence staining, as a rapid analytical tool for probing the effect of contaminants in highly impacted environment is demonstrated. (via Semantic Scholar)
Source: ORCID
Added: March 21, 2019

2014 journal article

Analysis of the Field-Assisted Permanent Assembly of Oppositely Charged Particles

LANGMUIR, 30(22), 6577–6587.

By: B. Bharti n, G. Findenegg* & O. Velev n

Contributors: B. Bharti n, G. Findenegg* & O. Velev n

TL;DR: A set of assembly rules for permanent colloidal chain formation by oppositely charged particles are formulated that make possible the precise large-scale formation of particle chains of any length, which can serve as components in new gels, biomaterials, and fluids with controlled rheology. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Sources: Web Of Science, ORCID, NC State University Libraries
Added: August 6, 2018

2014 journal article

Controlling the Shape of Evaporating Droplets by Ionic Strength: Formation of Highly Anisometric Silica Supraparticles

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, 53(2), 586–590.

By: M. Sperling*, O. Velev n & M. Gradzielski n

Contributors: M. Sperling*, O. Velev n & M. Gradzielski n

author keywords: anisometric particles; colloids; shape control; silica; supraparticles
TL;DR: Anisometric silica supraparticles are produced by a simple process of evaporation of sessile droplets containing fumed silica deposited on a superhydrophobic substrate, and become anisometric beyond a threshold concentration, as quantified by light microscopy. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Sources: Web Of Science, ORCID, NC State University Libraries
Added: August 6, 2018

2014 journal article

Electro-actuated hydrogel walkers with dual responsive legs

SOFT MATTER, 10(9), 1337–1348.

By: D. Morales n, E. Palleau n, M. Dickey n & O. Velev n

Contributors: D. Morales n, E. Palleau n, M. Dickey n & O. Velev n

MeSH headings : Electrolytes / chemistry; Hydrogel, Polyethylene Glycol Dimethacrylate; Polymers / chemistry; Robotics; Solutions / chemistry
TL;DR: It is demonstrated that "osmotically passive" fixed charges play an important role in controlling the bending magnitude of the gel networks and exemplify a simple way to move and manipulate soft matter devices and robots in aqueous solutions. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Sources: Web Of Science, ORCID, NC State University Libraries
Added: August 6, 2018

2014 conference paper

Engineered kraft lignin particles for foam stabilization

International Congress on Energy 2014, ICE 2014 - Topical Conference at the 2014 AIChE Annual Meeting, 3. http://www.scopus.com/inward/record.url?eid=2-s2.0-84953706002&partnerID=MN8TOARS

By: S. Lam, A. Tibbits & O. Velev

Contributors: S. Lam, A. Tibbits & O. Velev

Source: ORCID
Added: March 21, 2019

2014 article

On-chip microelectrode impedance analysis of mammalian cell viability during biomanufacturing

Sharma, R., Blackburn, T., Hu, W., Wiltberger, K., & Velev, O. D. (2014, September). BIOMICROFLUIDICS, Vol. 8.

By: R. Sharma n, T. Blackburn*, W. Hu*, K. Wiltberger* & O. Velev n

Contributors: R. Sharma n, T. Blackburn*, W. Hu*, K. Wiltberger* & O. Velev n

TL;DR: The microelectrode technique was found to be sensitive to physiological changes taking place inside the cells before their membrane integrity is compromised, and accurate determination of the metabolic status during this initial period may be essential for several biotechnology operations. (via Semantic Scholar)
Sources: Web Of Science, ORCID, NC State University Libraries
Added: August 6, 2018

2014 review

Pickering stabilization of foams and emulsions with particles of biological origin

[Review of ]. CURRENT OPINION IN COLLOID & INTERFACE SCIENCE, 19(5), 490–500.

By: S. Lam n, K. Velikov* & O. Velev n

Contributors: S. Lam n, K. Velikov* & O. Velev n

author keywords: Biopolymer; Biologically derived particles; Cellulose; Starch; Lignin; Protein; Chitin; Pickering; Foams; Emulsions
Sources: Web Of Science, ORCID, NC State University Libraries
Added: August 6, 2018

2014 conference paper

Role of biopolymer particles in the efficient stabilization of Pickering foams

Engineering Sciences and Fundamentals 2014 - Core Programming Area at the 2014 AIChE Annual Meeting, 2. http://www.scopus.com/inward/record.url?eid=2-s2.0-84954133375&partnerID=MN8TOARS

By: S. Lam, R. Von Klitzing & O. Velev

Contributors: S. Lam, R. Von Klitzing & O. Velev

Source: ORCID
Added: March 21, 2019

2014 article

Synthesis and Novel Applications of Biopolymer and Biologically Derived Particles

Velikov, K. P., & Velev, O. D. (2014, October). CURRENT OPINION IN COLLOID & INTERFACE SCIENCE, Vol. 19, pp. 381–382.

By: K. Velikov* & O. Velev n

Contributors: K. Velikov* & O. Velev n

Sources: Web Of Science, ORCID, NC State University Libraries
Added: August 6, 2018

2013 journal article

Alternating current-dielectrophoresis driven on-chip collection and chaining of green microalgae in freshwaters

BIOMICROFLUIDICS, 7(2).

By: C. Suscillon*, O. Velev n & V. Slaveykova*

Contributors: C. Suscillon*, O. Velev n & V. Slaveykova*

author keywords: biomembranes; bioMEMS; cellular biophysics; electrophoresis; lakes; microfluidics; microorganisms; rivers; toxicology
TL;DR: The application of AC-field had no effect on algal autofluorescence, cell membrane damage, or oxidative stress damages in C. reinhardtii and the cells suspended in freshwaters showed anomalously high chaining at long exposure times. (via Semantic Scholar)
Sources: Web Of Science, ORCID, NC State University Libraries
Added: August 6, 2018

2013 journal article

Biomimetic photocatalytic reactor with a hydrogel-embedded microfluidic network

JOURNAL OF MATERIALS CHEMISTRY A, 1(37), 11106–11110.

By: H. Koo n & O. Velev n

Contributors: H. Koo n & O. Velev n

UN Sustainable Development Goal Categories
6. Clean Water and Sanitation (Web of Science; OpenAlex)
Sources: Web Of Science, ORCID, NC State University Libraries
Added: August 6, 2018

2013 review

Engineering Cellular Photocomposite Materials Using Convective Assembly

[Review of ]. MATERIALS, 6(5), 1803–1825.

By: J. Jenkins n, M. Flickinger n & O. Velev n

Contributors: J. Jenkins n, M. Flickinger n & O. Velev n

author keywords: cellular photocomposites; continuous convective-sedimentation assembly; colloidal coatings; artificial leaves; biocomposite materials
TL;DR: This paper reviews the non-biological convective assembly literature, with an emphasis on how the method can be modified to deposit living cells starting from a batch process to its current state as a continuous process capable of fabricating larger multi-layer biocomposite coatings from diverse particle suspensions. (via Semantic Scholar)
Sources: Web Of Science, ORCID, NC State University Libraries
Added: August 6, 2018

2013 conference paper

External field directed co-assembly of rigid and ultra-flexible permanent chains

Engineering Sciences and Fundamentals 2013 - Core Programming Area at the 2013 AIChE Annual Meeting: Global Challenges for Engineering a Sustainable Future, 2. http://www.scopus.com/inward/record.url?eid=2-s2.0-84911871745&partnerID=MN8TOARS

By: B. Bharti, A. Fameau, G. Findenegg & O. Velev

Contributors: B. Bharti, A. Fameau, G. Findenegg & O. Velev

Source: ORCID
Added: March 21, 2019

2013 journal article

Field-directed assembly of patchy anisotropic microparticles with defined shape

SOFT MATTER, 9(38), 9219–9229.

Contributors: C. Wyatt Shields Iv, S. Zhu n, Y. Yang*, B. Bharti n, J. Liu*, B. Yellen*, O. Velev n, G. López*

TL;DR: The resulting structures, and similar ones produced through the field-directed assembly of patchy anisotropic particles, can possess unique electrical and optical properties and may have potential applications in a number of future technology applications such as microactuators, metamaterials and multiferroic materials. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Sources: Web Of Science, ORCID, NC State University Libraries
Added: August 6, 2018

2013 review

Ionic current devices-Recent progress in the merging of electronic, microfluidic, and biomimetic structures

[Review of ]. BIOMICROFLUIDICS, 7(3).

By: H. Koo n & O. Velev n

Contributors: H. Koo n & O. Velev n

TL;DR: The recent progress in the emerging area of devices and circuits operating on the basis of ionic currents, which operate at the intersection of electrochemistry, electronics, and microfluidics, and their potential applications are inspired by essential biological processes such as neural transmission. (via Semantic Scholar)
UN Sustainable Development Goal Categories
7. Affordable and Clean Energy (OpenAlex)
Sources: Web Of Science, ORCID, NC State University Libraries
Added: August 6, 2018

2013 journal article

Multi-stimuli responsive foams combining particles and self-assembling fatty acids

CHEMICAL SCIENCE, 4(10), 3874–3881.

By: A. Fameau*, S. Lam n & O. Velev n

Contributors: A. Fameau*, S. Lam n & O. Velev n

Sources: Web Of Science, ORCID, NC State University Libraries
Added: August 6, 2018

2013 article

PATCHY NANOPARTICLES Curvature makes a difference

Velev, O. D. (2013, September). NATURE NANOTECHNOLOGY, Vol. 8, pp. 620–621.

By: O. Velev n

Contributors: O. Velev n

TL;DR: The local curvature of dumbbell-shaped nanoparticles can be used to control the ionization state of a molecular layer adsorbed on their surfaces and the self-assembly patterns of the particles. (via Semantic Scholar)
UN Sustainable Development Goal Categories
13. Climate Action (Web of Science)
Sources: Web Of Science, ORCID, NC State University Libraries
Added: August 6, 2018

2013 journal article

Regenerable Photovoltaic Devices with a Hydrogel-Embedded Microvascular Network

SCIENTIFIC REPORTS, 3.

By: H. Koo n & O. Velev n

Contributors: H. Koo n & O. Velev n

MeSH headings : Biomimetics / instrumentation; Electric Power Supplies; Equipment Reuse; Hydrogels / chemistry; Light; Microfluidics / instrumentation; Microvessels; Plant Leaves; Regeneration; Solar Energy
TL;DR: This work reports an organic dye photovoltaic system that has been endowed with such microfluidic regeneration functionality, andetitive restoration of photvoltaic performance after intensive device degradation is demonstrated. (via Semantic Scholar)
Sources: Web Of Science, ORCID, NC State University Libraries
Added: August 6, 2018

2013 journal article

Reversible patterning and actuation of hydrogels by electrically assisted ionoprinting

NATURE COMMUNICATIONS, 4(1).

By: E. Palleau n, D. Morales n, M. Dickey n & O. Velev n

Contributors: E. Palleau n, D. Morales n, M. Dickey n & O. Velev n

TL;DR: An ‘ionoprinting’ technique with the capability to topographically structure and actuate hydrated gels in two and three dimensions by locally patterning ions via their directed injection and complexation, assisted by electric fields is introduced. (via Semantic Scholar)
Sources: Web Of Science, ORCID, NC State University Libraries
Added: August 6, 2018

2013 journal article

Stability and Viscoelasticity of Magneto-Pickering Foams

Langmuir, 29(32), 10019–10027.

By: E. Blanco n, S. Lam n, S. Smoukov n, K. Velikov*, S. Khan n & O. Velev n

Contributors: E. Blanco n, S. Lam n, S. Smoukov n, K. Velikov*, S. Khan n & O. Velev n

MeSH headings : Iron Carbonyl Compounds / chemistry; Magnetic Fields; Methylcellulose / analogs & derivatives; Methylcellulose / chemistry; Oleic Acids / chemistry; Particle Size; Surface Properties; Viscosity
TL;DR: A new class of bistable Pickering foams, which can remain intact for weeks at room temperature but can be destroyed rapidly and on-demand with the use of a magnetic field, is developed. (via Semantic Scholar)
Sources: ORCID, Crossref
Added: March 21, 2019

2013 book

Transport control of fluid and solutes in microchannels using ac field and semiconductor diodes

In Fluid Transport: Theory, Dynamics and Applications (pp. 241–258). http://www.scopus.com/inward/record.url?eid=2-s2.0-84892285213&partnerID=MN8TOARS

By: D. Petsev & O. Velev

Contributors: D. Petsev & O. Velev

Source: ORCID
Added: March 21, 2019

2013 journal article

Two-dimensional colloidal networks induced by a uni-axial external field

SOFT MATTER, 9(8), 2518–2524.

By: H. Schmidle*, S. Jaeger, C. Hall n, O. Velev n & S. Klapp*

Contributors: H. Schmidle*, S. Jäger*, C. Hall n, O. Velev n & S. Klapp*

UN Sustainable Development Goal Categories
13. Climate Action (Web of Science)
Sources: ORCID, Web Of Science, NC State University Libraries
Added: August 6, 2018

2013 conference paper

XanoShear™ Large-scale fabrication of functional Nanofibers

International Symposium on Fibers Interfacing the World. http://www.scopus.com/inward/record.url?eid=2-s2.0-84969813025&partnerID=MN8TOARS

By: N. Vitchuli, T. Tian, S. Smoukov, S. Gangwal, P. Geisen, M. Wright, O. Velev

Contributors: N. Vitchuli, T. Tian, S. Smoukov, S. Gangwal, P. Geisen, M. Wright, O. Velev

Source: ORCID
Added: March 21, 2019

2012 journal article

Co-assembly of oppositely charged particles into linear clusters and chains of controllable length

Scientific Reports, 2.

By: B. Bharti n, G. Findenegg* & O. Velev n

Contributors: B. Bharti n, G. Findenegg* & O. Velev n

TL;DR: It is demonstrated how well-organized, permanent clusters and chains of micron-sized particles can be assembled by applying DEP to mixtures of oppositely charged microspheres, and it is found that the length of the formed chains depends on size ratio as well as the number ratio of the two species. (via Semantic Scholar)
Sources: ORCID, NC State University Libraries, NC State University Libraries
Added: August 6, 2018

2012 journal article

Deposition of composite coatings from particle–particle and particle–yeast blends by convective-sedimentation assembly

Journal of Colloid and Interface Science, 380(1), 192–200.

By: J. Jenkins n, M. Flickinger n & O. Velev n

Contributors: J. Jenkins n, M. Flickinger n & O. Velev n

author keywords: Colloidal coatings; Size-selective segregation; Bimodal blends; Convective assembly of biocomposite yeast blends
MeSH headings : Aluminum / chemistry; Cells, Immobilized / cytology; Colloids / chemistry; Glass / chemistry; Microspheres; Particle Size; Polyesters / chemistry; Polypropylenes / chemistry; Saccharomyces cerevisiae / cytology; Sulfates / chemistry
TL;DR: This study shows how substrate wettability, suspension composition, particle size ratio and surface charge affect the deposition process and resulting coating microstructure (particle ordering and void space) and confirms the existence of significant polymer particle-yeast interactions and formation of particle aggregates that disrupt coatingmicrostructure during deposition. (via Semantic Scholar)
Sources: ORCID, NC State University Libraries, Crossref, NC State University Libraries
Added: August 6, 2018

2012 journal article

Electric-Field-Controlled Flow in Nanoscale-Thin Wetting Films

LANGMUIR, 28(5), 3037–3044.

By: J. Kleinert n, S. Kim n & O. Velev n

Contributors: J. Kleinert n, S. Kim n & O. Velev n

MeSH headings : Electromagnetic Fields; Membranes, Artificial; Microfluidic Analytical Techniques / instrumentation; Microfluidic Analytical Techniques / methods; Nanostructures / chemistry; Particle Size; Surface Properties; Wettability
TL;DR: A novel nanofluidic system based on electroosmotic flow in nanoscale-thin aqueous wetting films is reported, and the mobilities of the thin fluid layer and the flow marker were lower than the predictions of the electrokinetic theory. (via Semantic Scholar)
UN Sustainable Development Goal Categories
6. Clean Water and Sanitation (OpenAlex)
Sources: Web Of Science, ORCID, NC State University Libraries
Added: August 6, 2018

2012 journal article

Fabrication of Environmentally Biodegradable Lignin Nanoparticles

CHEMPHYSCHEM, 13(18), 4235–4243.

By: C. Frangville*, M. Rutkevicius*, A. Richter n, O. Velev n, S. Stoyanov* & V. Paunov*

Contributors: C. Frangville*, M. Rutkevičius*, A. Richter n, O. Velev n, S. Stoyanov* & V. Paunov*

author keywords: biodegradable; lignin; nanoparticles; pH dependence; porosity
MeSH headings : Biodegradation, Environmental; Chemical Precipitation; Drug Carriers / chemistry; Drug Delivery Systems / methods; Drug Stability; Hydrogen-Ion Concentration; Hydrophobic and Hydrophilic Interactions; Lignin / chemistry; Nanoparticles / chemistry; Particle Size; Polyethylene Glycols / chemistry; Solutions / chemistry
TL;DR: The study reveals that lignin NPs from the ethylene glycol-based precipitation contain densely packed lignIn domains which explain the stability of the NPs even at high pH, which suggest that these NPs are highly porous and consist of smaller lign in domains. (via Semantic Scholar)
Sources: Web Of Science, ORCID, NC State University Libraries
Added: August 6, 2018

2012 journal article

Gel-Based Self-Propelling Particles Get Programmed To Dance

LANGMUIR, 28(26), 10128–10135.

By: R. Sharma n, S. Chang* & O. Velev n

Contributors: R. Sharma n, S. Chang* & O. Velev n

TL;DR: A class of gel-based self-propelling particles moving by the Marangoni effect in an oscillatory mode made of an ethanol-infused polyacrylamide hydrogel contained in plastic tubing that can find applications as mixers and cargo carriers in lab-on-a-chip devices, and in various platforms for sensing and processing at the microscale. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Sources: Web Of Science, ORCID, NC State University Libraries
Added: August 6, 2018

2012 journal article

Ionic Current Rectification in Soft-Matter Diodes with Liquid-Metal Electrodes

ADVANCED FUNCTIONAL MATERIALS, 22(3), 625–631.

By: J. So n, H. Koo n, M. Dickey n & O. Velev n

Contributors: J. So n, H. Koo n, M. Dickey n & O. Velev n

author keywords: hydrogels; liquid metal; ionic current rectification; polyelectrolytes; soft matter; soft electronics; electrochemical diodes
UN Sustainable Development Goal Categories
Sources: Web Of Science, ORCID, NC State University Libraries
Added: August 6, 2018

2012 book

Materials deposition in evaporating menisci - Fundamentals and engineering applications of the convective assembly process

In Evaporative Self-Assembly of Ordered Complex Structures (pp. 109–156).

By: B. Prevo* & O. Velev n

Contributors: B. Prevo* & O. Velev n

Source: ORCID
Added: March 21, 2019

2012 journal article

Microfluidic elastomer composites with switchable vis-IR transmittance

Soft Matter, 8(44), 11232–11235.

By: A. U?ar & O. Velev n

Contributors: A. Uçar n & O. Velev n

UN Sustainable Development Goal Categories
Source: ORCID
Added: March 21, 2019

2012 journal article

Microfluidic elastomer composites with switchable vis-IR transmittance

Soft Matter, 8(44), 11232–11235.

By: A. Ucar & O. Velev

Source: NC State University Libraries
Added: August 6, 2018

2012 journal article

On-chip latex agglutination immunoassay readout by electrochemical impedance spectroscopy

Lab on a Chip - Miniaturisation for Chemistry and Biology, 12(21), 4279–4286.

By: S. Gupta*, P. Kilpatrick*, E. Melvin n & O. Velev n

Contributors: S. Gupta*, P. Kilpatrick*, E. Melvin n & O. Velev n

MeSH headings : Antibodies / chemistry; Antigen-Antibody Reactions; Antigens / chemistry; Dielectric Spectroscopy / methods; Electrodes; Immunoassay / methods; Microfluidic Analytical Techniques / methods; Microspheres; Particle Size; Surface Properties
TL;DR: A new class of impedance-based lab-on-chip immunosensors in which the immunoagglutination of latex is monitored by electrochemical impedance spectroscopy (EIS) holds promise for developing sensitive miniaturized sensors for rapid immunotesting. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Sources: ORCID, NC State University Libraries, NC State University Libraries
Added: August 6, 2018

2012 journal article

Phase diagram of two-dimensional systems of dipole-like colloids

SOFT MATTER, 8(5), 1521–1531.

By: H. Schmidle*, C. Hall n, O. Velev n & S. Klapp*

Contributors: H. Schmidle*, C. Hall n, O. Velev n & S. Klapp*

UN Sustainable Development Goal Categories
13. Climate Action (Web of Science)
Sources: Web Of Science, ORCID, NC State University Libraries
Added: August 6, 2018

2011 journal article

Aqueous soft matter based photovoltaic devices

Journal of Materials Chemistry, 21(1), 72–79.

Contributors: H. Koo n, S. Chang*, J. Slocik*, R. Naik* & O. Velev n

UN Sustainable Development Goal Categories
Source: ORCID
Added: March 21, 2019

2011 article

Colloidal dispersions by engineering and design

Velikov, K. P., & Velev, O. D. (2011, April). CURRENT OPINION IN COLLOID & INTERFACE SCIENCE, Vol. 16, pp. 81–83.

By: K. Velikov & O. Velev*

Contributors: K. Velikov & O. Velev*

UN Sustainable Development Goal Categories
Sources: Web Of Science, ORCID, NC State University Libraries
Added: August 6, 2018

2011 journal article

Convective Assembly of 2D Lattices of Virus-like Particles Visualized by In-Situ Grazing-Incidence Small-Angle X-Ray Scattering

SMALL, 7(8), 1043–1050.

By: C. Ashley*, D. Dunphy*, Z. Jiang*, E. Carnes*, Z. Yuan*, D. Petsev*, P. Atanassov*, O. Velev n ...

Contributors: C. Ashley*, D. Dunphy*, Z. Jiang*, E. Carnes*, Z. Yuan*, D. Petsev*, P. Atanassov*, O. Velev n ...

MeSH headings : Bacteriophages / chemistry; Glycerol / chemistry; Scattering, Small Angle; Time Factors; Virion / chemistry; Water / chemistry; X-Ray Diffraction / methods
TL;DR: In-situ grazing-incidence small-angle X-ray scattering (GISAXS) is used to follow the self-assembly process in real time to characterize the mechanism of superlattice formation, with the ultimate goal of tailoring film deposition conditions to optimize long-range order. (via Semantic Scholar)
UN Sustainable Development Goal Categories
6. Clean Water and Sanitation (OpenAlex)
Sources: Web Of Science, ORCID, NC State University Libraries
Added: August 6, 2018

2011 journal article

Magnetically responsive pickering foams

Journal of the American Chemical Society, 133(35), 13856–13859.

By: S. Lam n, E. Blanco n, S. Smoukov n, K. Velikov* & O. Velev n

Contributors: S. Lam n, E. Blanco n, S. Smoukov n, K. Velikov* & O. Velev n

MeSH headings : Iron Carbonyl Compounds / chemistry; Magnetic Fields; Magnets / chemistry; Methylcellulose / analogs & derivatives; Methylcellulose / chemistry; Oleic Acid / chemistry; Particle Size; Solutions / chemistry
TL;DR: A new class of Pickering foams which can be manipulated using a magnetic field is introduced, stabilized by a mixture of magnetic and nonmagnetic particles, and has potential applications in noncontact defoaming processes. (via Semantic Scholar)
UN Sustainable Development Goal Categories
6. Clean Water and Sanitation (OpenAlex)
Source: ORCID
Added: March 21, 2019

2011 journal article

On-chip collection of particles and cells by AC electroosmotic pumping and dielectrophoresis using asymmetric microelectrodes

Biomicrofluidics, 5(3).

By: E. Melvin n, B. Moore n, K. Gilchrist*, S. Grego* & O. Velev n

Contributors: E. Melvin n, B. Moore n, K. Gilchrist*, S. Grego* & O. Velev n

author keywords: biochemistry; electrophoresis; lab-on-a-chip; microelectrodes; microfluidics; osmosis
TL;DR: A particle collection device capable of concentrating micron-sized particles in a predetermined area by combining AC electroosmosis (ACEO) and dielectrophoresis (DEP), which is amenable to integration with a variety of detection techniques such as optical evanescent waveguide sensing. (via Semantic Scholar)
Sources: ORCID, NC State University Libraries, NC State University Libraries
Added: August 6, 2018

2011 book

Stabilization of Thin Films, Foams, Emulsions and Bifluid Gels with Surface-Active Solid Particles

In Colloid Stability and Application in Pharmacy (Vol. 3, pp. 277–306).

By: K. Velikov* & O. Velev n

Contributors: K. Velikov* & O. Velev n

Source: ORCID
Added: March 21, 2019

2011 journal article

Towards All-Soft Matter Circuits: Prototypes of Quasi-Liquid Devices with Memristor Characteristics

ADVANCED MATERIALS, 23(31), 3559-+.

By: H. Koo n, J. So n, M. Dickey n & O. Velev n

Contributors: H. Koo n, J. So n, M. Dickey n & O. Velev n

MeSH headings : Electrodes; Electrolytes / chemistry; Electronics; Hydrogel, Polyethylene Glycol Dimethacrylate / chemistry; Metals / chemistry; Oxides / chemistry; Robotics
TL;DR: A new class of electrically functional devices composed entirely of soft, liquid-based materials that display memristor-like characteristics is presented, which may become the core of next generation memory devices because of their low energy consumption and high data density and performance. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Sources: Web Of Science, ORCID, NC State University Libraries
Added: August 6, 2018

2011 journal article

Ultrathin film coatings of aligned cellulose nanocrystals from a convective-shear assembly system and their surface mechanical properties

Soft Matter, 7(5), 1957.

By: I. Hoeger n, O. Rojas n, K. Efimenko n, O. Velev n & S. Kelley n

Contributors: I. Hoeger n, O. Rojas n, K. Efimenko n, O. Velev n & S. Kelley n

Sources: ORCID, NC State University Libraries, Crossref, NC State University Libraries
Added: August 6, 2018

2010 journal article

Anisotropie particle synthesis inside droplet templates on superhydrophobic surfaces

Macromolecular Rapid Communications, 31(2), 190–195.

By: V. Rastogi n, A. Garcia*, M. Marquez & O. Velev n

Contributors: V. Rastogi n, A. Garcia*, M. Marquez & O. Velev n

author keywords: anisotropic supraparticles; droplet templating; hierarchically ordered materials; nanoparticles; self-assembly; superhydrophobic surfaces
TL;DR: It is demonstrated how droplet templates dispensed on superhydrophobic substrates can be used to fabricate both shape-anisotropic ("doughnut") and composition-an isotropic ("patchy magnetic") supraparticles. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Sources: ORCID, NC State University Libraries, NC State University Libraries
Added: August 6, 2018

2010 journal article

Bicontinuous gels formed by self-assembly of dipolar colloid particles

SOFT MATTER, 6(3), 480–484.

By: A. Goyal n, C. Hall n & O. Velev n

Contributors: A. Goyal n, C. Hall n & O. Velev n

UN Sustainable Development Goal Categories
13. Climate Action (Web of Science)
Sources: Web Of Science, ORCID, NC State University Libraries
Added: August 6, 2018

2010 journal article

Directed assembly of yeast cells into living yeastosomes by microbubble templating

Soft Matter, 6(15), 3494–3498.

By: M. Brandy*, O. Cayre*, R. Fakhrullin*, O. Velev n & V. Paunov*

Contributors: M. Brandy*, O. Cayre*, R. Fakhrullin*, O. Velev n & V. Paunov*

TL;DR: The fabrication of yeastosomes is reported, which consist of a spherical monolayer of living yeast cells held together by colloid interactions, which resembles the primitive forms of multicellular species, like Volvox, and other algae and could be regarded as one possible stage of the evolutionary development ofMulticellularity. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Sources: ORCID, NC State University Libraries, NC State University Libraries
Added: August 6, 2018

2010 journal article

Electric-Field-Assisted Convective Assembly of Colloidal Crystal Coatings

LANGMUIR, 26(12), 10380–10385.

By: J. Kleinert n, S. Kim n & O. Velev n

Contributors: J. Kleinert n, S. Kim n & O. Velev n

TL;DR: The data suggest that the EWOD-increased liquid surface area results in increased evaporation-driven particle flux and crystal assembly that is up to five times more rapid. (via Semantic Scholar)
Sources: Web Of Science, ORCID, NC State University Libraries
Added: August 6, 2018

2010 journal article

Erratum: Live celloidosome structures based on the assembly of individual cells by colloid interactions (Physical Chemistry Chemical Physics (2010) 12 (11912-11922) DOI: 10.1039/c0cp00131g)

Physical Chemistry Chemical Physics, 12(45). http://www.scopus.com/inward/record.url?eid=2-s2.0-78649768387&partnerID=MN8TOARS

By: R. Fakhrullin, M. Brandy, O. Cayre, O. Velev & V. Paunov

Contributors: R. Fakhrullin, M. Brandy, O. Cayre, O. Velev & V. Paunov

Source: ORCID
Added: March 21, 2019

2010 journal article

Ion-current diode with aqueous gel/sio<inf>2</inf> nanofilm interfaces

Small, 6(13), 1393–1397.

By: H. Koo n, S. Chang* & O. Velev n

Contributors: H. Koo n, S. Chang* & O. Velev n

MeSH headings : Electricity; Electrolytes / chemistry; Electronics / instrumentation; Gels / chemistry; Ions; Nanostructures / chemistry; Nonlinear Dynamics; Silicon Dioxide / chemistry
TL;DR: Non-linear ion transport through nanoscale structures can be used in new types of microcircuit, inspired by biological processes such as adenosine triphosphate synthesis and neural transmission, as well as signal processing, for example, ionic current rectification and amplification as in electronic circuits. (via Semantic Scholar)
Sources: ORCID, NC State University Libraries, NC State University Libraries
Added: August 6, 2018

2010 journal article

Live celloidosome structures based on the assembly of individual cells by colloid interactions

Physical Chemistry Chemical Physics, 12(38), 11912–11922.

By: R. Fakhrullin*, M. Brandy*, O. Cayre*, O. Velev n & V. Paunov*

Contributors: R. Fakhrullin*, M. Brandy*, O. Cayre*, O. Velev n & V. Paunov*

MeSH headings : Air; Calcium Carbonate / chemistry; Capsules / chemistry; Carboxymethylcellulose Sodium / chemistry; Colloids / chemistry; Crystallization; Magnetics; Microbubbles; Nanoparticles / chemistry; Polyamines / chemistry; Tissue Engineering / methods; Tissue Scaffolds / chemistry; Yeasts / cytology
TL;DR: Two alternative approaches were developed to form celloidosome structures using magnetically functionalised core-shell microparticles which resulted in the formation of celloidsomes with needle-like and cubic-like geometries which follows the original morphology of the calcium carbonate microcrystals. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Sources: ORCID, NC State University Libraries, NC State University Libraries
Added: August 6, 2018

2010 journal article

Macromol. Rapid Commun. 2/2010

Macromolecular Rapid Communications, 31(2), NA-NA.

By: V. Rastogi, A. García, M. Marquez* & O. Velev

Sources: Crossref, NC State University Libraries
Added: September 8, 2020

2010 journal article

Microfluidic characterization of sustained solute release from porous supraparticles

Physical Chemistry Chemical Physics, 12(38), 11975–11983.

By: V. Rastogi n, K. Velikov* & O. Velev n

Contributors: V. Rastogi n, K. Velikov* & O. Velev n

MeSH headings : Coloring Agents / administration & dosage; Delayed-Action Preparations / chemistry; Diffusion; Equipment Design; Microfluidics / instrumentation; Microfluidics / methods; Microspheres; Porosity
TL;DR: A novel microfluidic technique for precise characterization of controlled release of solute from porous latex supraparticles in a laminar flow environment and the role of the uniformly porous supraparticle matrix for the prolonged continuous solute delivery is illustrated. (via Semantic Scholar)
UN Sustainable Development Goal Categories
6. Clean Water and Sanitation (OpenAlex)
Sources: ORCID, NC State University Libraries, NC State University Libraries
Added: August 6, 2018

2010 journal article

On-Chip Dielectrophoretic Coassembly of Live Cells and Particles into Responsive Biomaterials

LANGMUIR, 26(5), 3441–3452.

By: S. Gupta n, R. Alargova n, P. Kilpatrick n & O. Velev n

Contributors: S. Gupta n, R. Alargova n, P. Kilpatrick n & O. Velev n

MeSH headings : Animals; Cell Adhesion; Cell Membrane / metabolism; Cell Survival; Colloids; Electricity; Electrodes; Electrolytes / chemistry; Electrophoresis / instrumentation; Fibroblasts / cytology; Hydrogen-Ion Concentration; Latex; Magnetics; Mice; Microchip Analytical Procedures; NIH 3T3 Cells; Saccharomyces cerevisiae / cytology; Static Electricity
TL;DR: It is reported how live cells and functionalized colloidal particles can be coassembled into a variety of freely suspended bioactive structures using dielectrophoresis on a chip. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Sources: Web Of Science, ORCID, NC State University Libraries
Added: August 6, 2018

2010 journal article

Programmed assembly of metallodielectric patchy particles in external AC electric fields

Soft Matter, 6(7), 1413–1418.

By: S. Gangwal n, A. Pawar*, I. Kretzschmar* & O. Velev n

Contributors: S. Gangwal n, A. Pawar*, I. Kretzschmar* & O. Velev n

UN Sustainable Development Goal Categories
Sources: ORCID, NC State University Libraries, NC State University Libraries
Added: August 6, 2018

2010 journal article

Self-assembly in binary mixtures of dipolar colloids: Molecular dynamics simulations

JOURNAL OF CHEMICAL PHYSICS, 133(6).

By: A. Goyal n, C. Hall n & O. Velev n

Contributors: A. Goyal n, C. Hall n & O. Velev n

author keywords: colloids; crystallisation; gels; molecular dynamics method; phase diagrams; self-assembly
MeSH headings : Anisotropy; Colloids / chemistry; Models, Chemical; Molecular Dynamics Simulation; Nanostructures; Particle Size; Phase Transition; Surface Properties
TL;DR: Two novel aspects of the results are the appearance of a bicontinuous gel consisting of two interpenetrating networks--one formed by chains of particles with high dipole moment and the other formed by chained particles with low dipole moments, and cocrystals of large and small dipolar colloid particles. (via Semantic Scholar)
UN Sustainable Development Goal Categories
13. Climate Action (Web of Science)
Sources: Web Of Science, ORCID, NC State University Libraries
Added: August 6, 2018

2010 book

Stabilization of Thin Films, Foams, Emulsions and Bifluid Gels with Surface-Active Solid Particles

In Colloids and Interface Science Series (Vol. 3, pp. 277–306).

By: K. Velikov* & O. Velev n

Contributors: K. Velikov* & O. Velev n

Source: ORCID
Added: March 21, 2019

2010 book

Transport control of fluid and solutes in microchannels using AC field and semiconductor diodes

In Continuum Mechanics (pp. 85–103). http://www.scopus.com/inward/record.url?eid=2-s2.0-84892110534&partnerID=MN8TOARS

By: D. Petsev & O. Velev

Contributors: D. Petsev & O. Velev

Source: ORCID
Added: March 21, 2019

2009 journal article

Deposition of Coatings from Live Yeast Cells and Large Particles by "Convective-Sedimentation" Assembly

LANGMUIR, 25(10), 5692–5702.

By: L. Jerrim n & O. Velev n

Contributors: L. Jerrim n & O. Velev n

MeSH headings : Computer Simulation; Glass / chemistry; Microspheres; Saccharomyces cerevisiae / chemistry; Saccharomyces cerevisiae / cytology
TL;DR: The experiments and numerical simulations demonstrated that the deposition process is strongly affected by the presence of sedimentation, and the "convective-sedimentation" assembly method was used to deposit mixed layers of live cells and large latex particles as an example of immobilized biologically active composite coatings. (via Semantic Scholar)
Sources: Web Of Science, ORCID, NC State University Libraries
Added: August 6, 2018

2009 journal article

Intense and selective coloration of foams stabilized with functionalized particles

JOURNAL OF MATERIALS CHEMISTRY, 19(38), 7043–7049.

By: S. Kim n, H. Barraza* & O. Velev n

Contributors: S. Kim n, H. Barraza* & O. Velev n

UN Sustainable Development Goal Categories
6. Clean Water and Sanitation (OpenAlex)
Sources: Web Of Science, ORCID, NC State University Libraries
Added: August 6, 2018

2009 review

Materials Fabricated by Micro- and Nanoparticle Assembly - The Challenging Path from Science to Engineering

[Review of ]. ADVANCED MATERIALS, 21(19), 1897–1905.

By: O. Velev n & S. Gupta n

Contributors: O. Velev n & S. Gupta n

Sources: Web Of Science, ORCID, NC State University Libraries
Added: August 6, 2018

2009 journal article

Materials of Controlled Shape and Stiffness with Photocurable Microfluidic Endoskeleton

ADVANCED MATERIALS, 21(27), 2803-+.

By: S. Chang n, A. Ucar n, G. Swindlehurst n, R. Bradley n, F. Renk* & O. Velev n

Contributors: S. Chang n, A. Uçar n, G. Swindlehurst n, R. Bradley n, F. Renk* & O. Velev n

UN Sustainable Development Goal Categories
Sources: Web Of Science, ORCID, NC State University Libraries
Added: August 6, 2018

2009 journal article

Microfluidic Endoskeletons: Materials of Controlled Shape and Stiffness with Photocurable Microfluidic Endoskeleton (Adv. Mater. 27/2009)

Advanced Materials, 21(27), n/a-n/a.

By: S. Chang n, A. Uçar n, G. Swindlehurst n, R. Bradley n, F. Renk* & O. Velev n

Sources: Crossref, NC State University Libraries
Added: September 8, 2020

2009 journal article

Particle-localized AC and DC manipulation and electrokinetics

Annual Reports on the Progress of Chemistry - Section C, 105, 213–246.

By: O. Velev n, S. Gangwal n & D. Petsev*

Contributors: O. Velev n, S. Gangwal n & D. Petsev*

UN Sustainable Development Goal Categories
6. Clean Water and Sanitation (OpenAlex)
Source: ORCID
Added: March 21, 2019

2009 journal article

Reconfigurable responsive structures assembled from magnetic Janus particles

SOFT MATTER, 5(6), 1285–1292.

By: S. Smoukov n, S. Gangwal n, M. Marquez* & O. Velev n

Contributors: S. Smoukov n, S. Gangwal n, M. Marquez* & O. Velev n

Sources: Web Of Science, ORCID, NC State University Libraries
Added: August 6, 2018

2008 conference paper

Computer simulation of self-assembly of dipolar colloid particles for the design of stimuli-responsive materials

AIChE Annual Meeting, Conference Proceedings. http://www.scopus.com/inward/record.url?eid=2-s2.0-79952308978&partnerID=MN8TOARS

By: A. Goyal, C. Hall & O. Velev

Contributors: A. Goyal, C. Hall & O. Velev

Source: ORCID
Added: March 21, 2019

2008 conference paper

Control of nanoscale flow in thin wetting films by electric field

AIChE Annual Meeting, Conference Proceedings. http://www.scopus.com/inward/record.url?eid=2-s2.0-79952301934&partnerID=MN8TOARS

By: J. Kleinert, S. Kim & O. Velev

Contributors: J. Kleinert, S. Kim & O. Velev

Source: ORCID
Added: March 21, 2019

2008 journal article

Cover Picture: Synthesis of Light-Diffracting Assemblies from Microspheres and Nanoparticles in Droplets on a Superhydrophobic Surface (Adv. Mater. 22/2008)

Advanced Materials, 20(22), NA-NA.

By: V. Rastogi n, S. Melle*, O. Calderón*, A. García*, M. Marquez* & O. Velev n

Sources: Crossref, NC State University Libraries
Added: September 8, 2020

2008 journal article

Dielectrophoretic Assembly of Metallodielectric Janus Particles in AC Electric Fields

LANGMUIR, 24(23), 13312–13320.

By: S. Gangwal n, O. Cayre n & O. Velev n

Contributors: S. Gangwal n, O. Cayre n & O. Velev n

TL;DR: The assembly of Janus metallodielectric particles driven by AC electric fields at frequencies above 10 kHz is demonstrated and the relation between field-induced dielectrophoretic force, field distribution, and structure of the assemblies is investigated. (via Semantic Scholar)
Sources: Web Of Science, ORCID, NC State University Libraries
Added: August 6, 2018

2008 conference paper

Dielectrophoretic assembly of new colloidal structures from janus and patchy metallodielectric particles

AIChE Annual Meeting, Conference Proceedings. http://www.scopus.com/inward/record.url?eid=2-s2.0-79952303416&partnerID=MN8TOARS

By: O. Velev, S. Gangwal, A. Pawar & I. Kretzschmar

Contributors: O. Velev, S. Gangwal, A. Pawar & I. Kretzschmar

Source: ORCID
Added: March 21, 2019

2008 conference paper

Electric field-assisted convective assembly of large-domain colloidal crystals

AIChE Annual Meeting, Conference Proceedings. http://www.scopus.com/inward/record.url?eid=2-s2.0-79952294231&partnerID=MN8TOARS

By: J. Kleinert, S. Kim & O. Velev

Contributors: J. Kleinert, S. Kim & O. Velev

Source: ORCID
Added: March 21, 2019

2008 journal article

Induced-charge electrophoresis of metallodielectric particles

Physical Review Letters, 100(5).

By: S. Gangwal n, O. Cayre n, M. Bazant* & O. Velev n

Contributors: S. Gangwal n, O. Cayre n, M. Bazant* & O. Velev n

TL;DR: Experimental observations of the motion of Janus microparticles with one dielectric and one metal-coated hemisphere induced by uniform fields of frequency 100 Hz-10 kHz in NaCl solutions suggest this phenomenon may find applications in microactuators, microsensors, and microfluidic devices. (via Semantic Scholar)
Sources: ORCID, NC State University Libraries, NC State University Libraries
Added: August 6, 2018

2008 journal article

Long-term stabilization of foams and emulsions with in-situ formed microparticles from hydrophobic cellulose

LANGMUIR, 24(17), 9245–9253.

By: H. Wege n, S. Kim n, V. Paunov n, Q. Zhong n & O. Velev n

Contributors: H. Wege n, S. Kim n, V. Paunov n, Q. Zhong n & O. Velev n

TL;DR: A new class of nontoxic inexpensive cellulose-based particle stabilizers has the potential to substitute conventional synthetic surfactants, especially in edible, pharmaceutical and biodegradable products. (via Semantic Scholar)
UN Sustainable Development Goal Categories
6. Clean Water and Sanitation (OpenAlex)
Sources: Web Of Science, ORCID, NC State University Libraries
Added: August 6, 2018

2008 journal article

Microwave, Photo- and Thermally Responsive PNIPAm-Gold Nanoparticle Microgels

LANGMUIR, 24(20), 11959–11966.

By: B. Budhlall n, M. Marquez n & O. Velev n

Contributors: B. Budhlall n, M. Marquez n & O. Velev n

MeSH headings : Acrylic Resins / chemistry; Colloids / chemistry; Equipment Design; Fluorescent Dyes / pharmacology; Gold / chemistry; Hemoglobins / chemistry; Humans; Light; Metal Nanoparticles / chemistry; Microfluidics; Microwaves; Polymers / chemistry; Polysorbates / chemistry; Surface Properties; Surface-Active Agents / chemistry
TL;DR: This is the first study to demonstrate that incorporating AuNPs speeds up the response kinetics of PNIPAm, and hence enhances the sensitivity to external stimuli of PnIPAm. (via Semantic Scholar)
UN Sustainable Development Goal Categories
6. Clean Water and Sanitation (OpenAlex)
Sources: Web Of Science, ORCID, NC State University Libraries
Added: August 6, 2018

2008 journal article

On-chip electric field driven assembly of biocomposites from live cells and functionalized particles

Soft Matter, 4(4), 726–730.

By: S. Gupta n, R. Alargova n, P. Kilpatrick n & O. Velev n

Contributors: S. Gupta n, R. Alargova n, P. Kilpatrick n & O. Velev n

TL;DR: Live cells and surface-functionalized synthetic microparticles are co-assembled on electrically controlled chips to yield permanent chains and one cell layer thick membranes that can be freely manipulated in external magnetic fields. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Sources: NC State University Libraries, ORCID, NC State University Libraries
Added: August 6, 2018

2008 journal article

Phase diagram for stimulus-responsive materials containing dipolar colloidal particles

PHYSICAL REVIEW E, 77(3).

By: A. Goyal n, C. Hall n & O. Velev n

Contributors: A. Goyal n, C. Hall n & O. Velev n

TL;DR: The self-assembly, structure, crystallization and/or gelation of systems of colloid particles with permanent dipole moments immersed in a high-dielectric solvent are explored, and the very low volume fraction gel phases and the well-ordered crystal phases are promising for advanced materials applications. (via Semantic Scholar)
UN Sustainable Development Goal Categories
13. Climate Action (Web of Science)
Sources: Web Of Science, ORCID, NC State University Libraries
Added: August 6, 2018

2008 patent

Process for preparing microrods using liquid-liquid dispersion

Washington, DC: U.S. Patent and Trademark Office.

By: O. Velev & R. Alargova

Source: NC State University Libraries
Added: August 6, 2018

2008 journal article