TY - CONF TI - High Performance Nonwovens AU - Pourdeyhimi, B. T2 - NET Inc. C2 - 2011/11// CY - Technical Association of the Pulp & Paper Industry (TAPPI), Atlanta, Georgia DA - 2011/11// PY - 2011/// ER - TY - CONF TI - Solution Blowing: Monolithic, Blended and Core-shell Nanofibers Incorporating Proteins and Resins, and Production of Turbostratic Carbon Nanotubes AU - Sinha-Ray, S. AU - Zhang, Y. AU - Yarin, A.L. AU - Pourdeyhimi, B. T2 - MRS Spring Meeting C2 - 2011/// CY - San Francisco, California DA - 2011/// PY - 2011/4/25/ ER - TY - RPRT TI - High strength, durable fabrics produced by fibrillating multilobal fibers AU - Pourdeyhimi, B. AU - Sharp, S. DA - 2011/// PY - 2011/// M1 - US7883772B2 M3 - Patent SN - US7883772B2 ER - TY - RPRT TI - Lightweight high-tensile, high-tear strength biocomponent nonwoven fabrics AU - Pourdeyhimi, B. AU - Fedorova, N.V. AU - Sharp, S.R. DA - 2011/5/3/ PY - 2011/5/3/ M1 - US7935645B2 M3 - Patent SN - US7935645B2 ER - TY - RPRT TI - High strength, durable micro and nano-fiber fabrics produced by fibrillating bicomponent islands in the sea fibers AU - Pourdeyhimi, B. AU - Fedorova, N.V. AU - Sharp, S.R. DA - 2011/7/19/ PY - 2011/7/19/ M1 - US7981226B2 M3 - Patent SN - US7981226B2 ER - TY - RPRT TI - Process of making mixed fibers and nonwoven fabrics AU - Pourdeyhimi, B. DA - 2011/7/19/ PY - 2011/7/19/ M1 - US7981336B2 M3 - Patent SN - US7981336B2 ER - TY - CONF TI - Nanofibers – Competing Technologies AU - Pourdeyhimi, B. T2 - Nanofiber for the 3rd Millennium C2 - 2011/// CY - Raleigh, NC DA - 2011/// PY - 2011/// ER - TY - RPRT TI - Mixed Fiber and Nonwoven Fabrics Made from the Same AU - Pourdeyhimi, Behnam DA - 2011/11/2/ PY - 2011/11/2/ M1 - 2179081 M3 - Europe Patent SN - 2179081 ER - TY - CONF TI - Preparation of Nano-textured Surfaces Capable of Achieving Cooling Rates of the Order 1 KW/cm2 in Spray Cooling AU - Sinha-Ray, S. AU - Zhang, Y. AU - Yarin, A.L. AU - Pourdeyhimi, B. T2 - Materials Research Society Spring Meeting, Symposium BB: Nanoscale Heat Transport - From Fundamentals to Devices C2 - 2011/// C3 - Proceedings of the MRS Springe Meeting CY - San Francisco, CA DA - 2011/// PY - 2011/4/25/ ER - TY - RPRT TI - Lightweight High-Tensile, High-Tear Strength Bicomponent Nonwoven Fabrics AU - Pourdeyhimi, Behnam AU - Fedorova, Nataliya V. AU - Sharp, Stephen R. DA - 2011/11/17/ PY - 2011/11/17/ M1 - 1866472 M3 - Europe Patent SN - 1866472 ER - TY - RPRT TI - High Tensile and High Tear Strength Nonwoven AU - Pourdeyhimi, Behnam AU - Fedorova, Nataliya V. AU - Sharp, Stephen R. DA - 2011/11/17/ PY - 2011/11/17/ M1 - 1866472 M3 - Germany Patent SN - 1866472 ER - TY - JOUR TI - Formation of novel thermoplastic composites using bicomponent nonwovens as a precursor AU - Dasdemir, Mehmet AU - Maze, Benoit AU - Anantharamaiah, Nagendra AU - Pourdeyhimi, Behnam T2 - Journal of Materials Science DA - 2011/1/6/ PY - 2011/1/6/ DO - 10.1007/S10853-010-5214-9 VL - 46 IS - 10 SP - 3269-3281 J2 - J Mater Sci LA - en OP - SN - 0022-2461 1573-4803 UR - http://dx.doi.org/10.1007/S10853-010-5214-9 DB - Crossref ER - TY - JOUR TI - Electrospun Nanofibers for Energy Storage T2 - Aatcc Review DA - 2011/// PY - 2011/// UR - https://publons.com/publon/7178353/ ER - TY - JOUR TI - Superacidic electrospun fiber-nafion hybrid proton exchange membranes AU - Yao, Y. F. AU - Lin, Z. AU - Li, Y. AU - Alcoutlabi, M. AU - Hamouda, H. AU - Zhang, X. W. T2 - Advanced Energy Materials DA - 2011/// PY - 2011/// VL - 1 ER - TY - JOUR TI - Recent developments in nanostructured anode materials for rechargeable lithium-ion batteries AU - Ji, L. W. AU - Lin, Z. AU - Alcoutlabi, M. AU - Zhang, X. W. T2 - Energy & Environmental Science DA - 2011/// PY - 2011/// VL - 4 ER - TY - JOUR TI - Lithium-oxygen batteries-Limiting factors that affect performance AU - Padbury, R. AU - Zhang, X. W. T2 - Journal of Power Sources DA - 2011/// PY - 2011/// VL - 196 ER - TY - JOUR TI - Electrospun Nanofibers for Energy Storage AU - Alcoutlabi, Mataz AU - Ji, Liwen AU - Guo, Bingkun AU - Li, Shuli AU - Li, Ying AU - Zhang, Shu AU - Toprakci, Ozan AU - Zhang, Xiangwu T2 - Aatcc Review DA - 2011/// PY - 2011/// VL - 11 IS - 6 SP - 45-51 ER - TY - JOUR TI - Electrospun Li4Ti5O12/C composites for lithium-ion batteries with high rate performance AU - Guo, Bingkun AU - Li, Ying AU - Yao, Yingfang AU - Lin, Zhan AU - Ji, Liwen AU - Xu, Guangjie AU - Liang, Yinzheng AU - Shi, Quan AU - Zhang, Xiangwu T2 - Solid State Ionics AB - Mixed-conducting lithium-ion doped emeraldine polyaniline (PAni)–polyethylene oxide (PEO) blends have been developed to achieve an optimal electronic–ionic conductivity balance in nano-tin composite anodes. Electrochemical evaluation was performed on the anodes with differing electrode preparation procedures, doping methods and PEO contents. Results indicate that both good electronic and ionic conductivity in the binder are required for rapid lithium insertion/extraction and low polarization. This doped PAni–PEO polymer blend is an attractive binder for high capacity composite anodes with low polarization. DA - 2011/// PY - 2011/// DO - 10.1016/S0167-2738(02)00522-2 VL - 204 IS - 3-4 SP - 61-65 KW - nano-tin KW - polyaniline KW - polyethylene oxide KW - polymer blend KW - composite electrode KW - mixed conductivity ER - TY - JOUR TI - Electrode Catalyst Materials in Direct Methanol Fuel Cells AU - Lin, Zhan AU - Zhang, Xiangwu T2 - International Journal of Nano Science, Nano Engineering and Nanotechnology DA - 2011/// PY - 2011/// VL - 3 SP - 1-24 ER - TY - JOUR TI - A Facile Approach to Fabricate Porous Nylon 6 Nanofibers Using Silica Nanotemplate AU - Shi, Quan AU - Vitchuli, Narendiran AU - Ji, Liwen AU - Nowak, Joshua AU - McCord, Marian AU - Bourham, Mohamed AU - Zhang, Xiangwu T2 - Journal of Applied Polymer Science AB - Abstract Porous Nylon 6 nanofibers were prepared using silica nanoparticles as the template. Firstly, Nylon 6/silica composite nanofibers were prepared as precursors by electrospinning Nylon 6 solutions containing different contents of silica nanoparticles. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were used to examine the surface morphology and the inner structure of composite nanofibers; where it was found that silica nanoparticles were distributed both inside and on the surface of nanofibers. Analytical techniques [Fourier transform infrared (FTIR), differential scanning calorimetry, thermal gravimetric analysis (TGA), and wide‐angle X‐ray diffraction) were used to study the structure and properties of these composite nanofibers. The glass transition, melting, and crystallization processes of the fibers were affected by the addition of silica nanoparticles. Secondly, porous Nylon 6 nanofibers were obtained by removing silica nanoparticles via hydrofluoric acid treatment. The removal of silica nanoparticles was confirmed using FTIR and TGA tests. SEM and TEM observations revealed the formation of the porous structure in these nanofibers. After the formation of the porous structure, Brunauer–Emmett–Teller specific surface areas of nanofibers were increased as compared to solid Nylon 6 and composite nanofibers. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2011 DA - 2011/// PY - 2011/// DO - 10.1002/app.33161 VL - 120 IS - 1 SP - 425-433 UR - https://publons.com/publon/3117881/ KW - electrospinning KW - nanocomposite KW - porous nanofibers KW - Nylon 6 ER - TY - CONF TI - Zinc Oxide/Nylon 6 Electrospun Fibers for Warfare Protective Applications C2 - 2011/4// C3 - 2011 AATCC Materials Research Poster Competition DA - 2011/4// ER - TY - CONF TI - Zinc Oxide/Nylon 6 Electrospun Fibers for Warfare Protective Applications C2 - 2011/4// C3 - 2nd Engineering Day at the NC Legislature DA - 2011/4// ER - TY - CONF TI - Si/C Nanofiber Composite Anodes for New-Generation Rechargeable Lithium-Ion Batteries C2 - 2011/4// C3 - the Sixth Annual NC State University Graduate Student Research Symposium DA - 2011/4// ER - TY - CONF TI - Si/C Nanofiber Composite Anodes for New-Generation Rechargeable Lithium-Ion Batteries C2 - 2011/11// C3 - 2011 MRS Fall Meeting & Exhibit DA - 2011/11// ER - TY - CONF TI - Novel Atmospheric Plasma Enhanced Composite Wound Dressings C2 - 2011/10// C3 - NTC Forum DA - 2011/10// ER - TY - CONF TI - Novel Atmospheric Plasma Enhanced Chitosan Nanofiber/Gauze Composite Wound Dressings C2 - 2011/4// C3 - 2011 AATCC Materials Research Poster Competition DA - 2011/4// ER - TY - CONF TI - New Li2MnSiO4/C Nanocomposite Cathode Materials C2 - 2011/11// C3 - 2011 MRS Fall Meeting & Exhibit DA - 2011/11// ER - TY - CONF TI - MnOx/Carbon Composite Nanofiber Cathodes for Rechargeable Li/Air Batteries C2 - 2011/11// C3 - 2011 MRS Fall Meeting & Exhibit DA - 2011/11// ER - TY - CONF TI - Fabrication and Electrochemical Characteristics of Electrospun LiFePO4/Carbon+Graphene Composite Nanofibers for Lithium-Ion Batteries C2 - 2011/11// C3 - 2011 MRS Fall Meeting & Exhibit DA - 2011/11// ER - TY - CONF TI - Electrospun Composite Nanofibers for Lithium-Ion Batteries C2 - 2011/10// C3 - NTC Forum DA - 2011/10// ER - TY - CONF TI - Carbon Nanofiber/Manganese Oxide Composites as the Cathode for Li-air Batteries C2 - 2011/8// C3 - NC State Undergraduate Research Summer Symposium DA - 2011/8// ER - TY - CONF TI - Carbon Nanofiber/Manganese Oxide Composites as the Cathode for Li-air Batteries C2 - 2011/9// C3 - NC State Undergraduate Research Summer Symposium DA - 2011/9// ER - TY - CONF TI - Integrating Computing into Thermodynamics: Lessons Learned AU - Pasquinelli, M. AU - Joines, J.A. T2 - American Society for Engineering Education International Conference C2 - 2011/// C3 - 2011 ASEE Annual Conference & Exposition DA - 2011/// SP - 22-901 ER - TY - JOUR TI - Electrospun Nanofiber-Based Anodes, Cathodes, and Separators for Advanced Lithium-Ion Batteries AU - Zhang, Xiangwu AU - Ji, Liwen AU - Toprakci, Ozan AU - Liang, Yinzheng AU - Alcoutlabi, Mataz T2 - POLYMER REVIEWS AB - Novel nanofiber technologies present the opportunity to design new materials for advanced rechargeable lithium-ion batteries. Among the various existing energy storage technologies, rechargeable lithium-ion batteries are considered as effective solution to the increasing need for high-energy electrochemical power sources. This review addresses using electrospinning technology to develop novel composite nanofibers which can be used as anodes, cathodes, and separators for lithium-ion batteries. The discussion focuses on the preparation, structure, and performance of silicon/carbon (Si/C) nanofiber anodes, lithium iron phosphate/carbon (LiFePO4/C) nanofiber cathodes, and lithium lanthanum titanate oxide/polyacrylonitrile (LLTO/PAN) nanofiber separators. Si/C nanofiber anodes have the advantages of both carbon (long cycle life) and Si (high lithium-storage capacity). LiFePO4/C nanofiber cathodes show good electrochemical performance including satisfactory capacity and good cycling stability. LLTO/PAN nanofiber separators have large electrolyte uptake, high ionic conductivity, and low interfacial resistance with lithium, which increase the capacity and improve the cycling stability of lithium-ion cells. These results demonstrate that electrospinning is a promising approach to prepare high-performance nanofiber anodes, nanofiber cathodes, and nanofiber separators that can potentially replace currently-used lithium-ion battery materials. DA - 2011/// PY - 2011/// DO - 10.1080/15583724.2011.593390 VL - 51 IS - 3 SP - 239-264 SN - 1558-3716 UR - https://publons.com/publon/674396/ ER - TY - JOUR TI - Multifunctional ZnO/Nylon 6 nanofiber mats by an electrospinning-electrospraying hybrid process for use in protective applications AU - Vitchuli, Narendiran AU - Shi, Quan AU - Nowak, Joshua AU - Kay, Kathryn AU - Caldwell, Jane M. AU - Breidt, Frederick AU - Bourham, Mohamed AU - McCord, Marian AU - Zhang, Xiangwu T2 - SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS AB - ZnO/Nylon 6 nanofiber mats were prepared by an electrospinning-electrospraying hybrid process in which ZnO nanoparticles were dispersed on the surface of Nylon 6 nanofibers without becoming completely embedded. The prepared ZnO/Nylon 6 nanofiber mats were evaluated for their abilities to kill bacteria or inhibit their growth and to catalytically detoxify chemicals. Results showed that these ZnO/Nylon 6 nanofiber mats had excellent antibacterial efficiency (99.99%) against both the Gram-negative Escherichia coli and Gram-positive Bacillus cereus bacteria. In addition, they exhibited good detoxifying efficiency (95%) against paraoxon, a simulant of highly toxic chemicals. ZnO/Nylon 6 nanofiber mats were also deposited onto nylon/cotton woven fabrics and the nanofiber mats did not significantly affect the moisture vapor transmission rates and air permeability values of the fabrics. Therefore, ZnO/Nylon 6 nanofiber mats prepared by the electrospinning-electrospraying hybrid process are promising material candidates for protective applications. DA - 2011/10// PY - 2011/10// DO - 10.1088/1468-6996/12/5/055004 VL - 12 IS - 5 SP - SN - 1468-6996 UR - https://publons.com/publon/3117882/ KW - electrospinning KW - electrospraying KW - Nylon 6 KW - zinc oxide KW - antibacterial KW - detoxification ER - TY - JOUR TI - Electrospun Li4Ti5O12/C composites for lithium-ion batteries with high rate performance AU - Guo, Bingkun AU - Li, Ying AU - Yao, Yingfang AU - Lin, Zhan AU - Ji, Liwen AU - Xu, Guangjie AU - Liang, Yinzheng AU - Shi, Quan AU - Zhang, Xiangwu T2 - SOLID STATE IONICS AB - Two types of Li4Ti5O12/C composites were synthesized through the electrospinning method. The first composite consists of Li4Ti5O12 nanoparticles and aggregates coated by carbon and connected by carbon nanofibers. The second composite is constructed solely by Li4Ti5O12/C fibers. These two composites are denoted as Li4Ti5O12/C particles/fibers and Li4Ti5O12/C fibers, respectively. It is found that both composites show higher reversible capacities and better rate performance than commercial Li4Ti5O12 nanoparticles. Comparing the two electrospun composites, Li4Ti5O12/C fibers exhibit higher reversible capacity, greater rate capacity, and smaller electrode polarization, indicating that Li4Ti5O12/C fibers have better kinetics than Li4Ti5O12/C particles/fibers due to the elimination of Li4Ti5O12 aggregates and the formation of carbon-based fiber structure. DA - 2011/12/12/ PY - 2011/12/12/ DO - 10.1016/j.ssi.2011.10.019 VL - 204 SP - 61-65 SN - 1872-7689 UR - https://publons.com/publon/3117890/ KW - Lithium-ion batteries KW - Anodes KW - Li4Ti5O12 KW - Nanofibers KW - Nanoparticles ER - TY - JOUR TI - Superacidic Electrospun Fiber-Nafion Hybrid Proton Exchange Membranes AU - Yao, Yingfang AU - Lin, Zhan AU - Li, Ying AU - Alcoutlabi, Mataz AU - Hamouda, Hechmi AU - Zhang, Xiangwu T2 - ADVANCED ENERGY MATERIALS AB - Abstract A novel type of hybrid membrane has been fabricated by incorporating superacidic sulfated zirconia (S‐ZrO 2 ) fibers into recast Nafion for proton exchange membrane fuel cells (PEMFCs). With the introduction of electrospun superacidic fiber mats, a large amount of protogenic groups aggregated in the interfacial region between S‐ZrO 2 fibers and the ionomer matrix, forming continuous pathways for facile proton transport. The resultant hybrid membranes had high proton conductivities, which were controlled by selectively adjusting the fiber diameter and fiber volume fraction. Consequently, the superacidic S‐ZrO 2 electrospun fibers are promising filler materials and hybrid membranes containing S‐ZrO 2 fiber mats can be potentially used in high‐performance fuel cells. DA - 2011/11// PY - 2011/11// DO - 10.1002/aenm.201100435 VL - 1 IS - 6 SP - 1133-1140 SN - 1614-6840 UR - https://publons.com/publon/6540073/ KW - hybrid membranes KW - fuel cells KW - Nafion KW - superacidic solids KW - fibers ER - TY - JOUR TI - Mammalian Cell Viability in Electrospun Composite Nanofiber Structures AU - Canbolat, Mehmet Fatih AU - Tang, Christina AU - Bernacki, Susan H. AU - Pourdeyhimi, Behnam AU - Khan, Saad T2 - MACROMOLECULAR BIOSCIENCE AB - Incorporation of mammalian cells into nanofibers (cell electrospinning) and multilayered cell-nanofiber structures (cell layering) via electrospinning are promising techniques for tissue engineering applications. We investigate the viability of 3T3-L1 mouse fibroblasts after incorporation into poly(vinyl alcohol) nanofibers and multilayering with poly(caprolactone) nanofibers and analyze the possible factors that affect cell viability. We observe that cells do not survive cell electrospinning but survive cell layering. Assessing the factors involved in cell electrospinning, we find that dehydration and fiber stretching are the main causes of cell death. In cell layering, the choice of solvent is critical, as residual solvent in the electrospun fibers could be detrimental to the cells. DA - 2011/10/10/ PY - 2011/10/10/ DO - 10.1002/mabi.201100108 VL - 11 IS - 10 SP - 1346-1356 SN - 1616-5195 KW - 3T3-L1 mice fibroblasts KW - electrospinning KW - nanofibers KW - fibers KW - nanotechnology KW - tissue engineering KW - viability ER - TY - JOUR TI - Electrospun nanofibers for energy storage AU - Alcoutlabi, M. AU - Ji, L. W. AU - Guo, B. K. AU - Li, S. L. AU - Li, Y. AU - Zhang, S. AU - Toprakci, O. AU - Zhang, X. W. T2 - AATCC Review DA - 2011/// PY - 2011/// VL - 11 IS - 6 SP - 45-51 ER - TY - JOUR TI - Development of a novel bleaching process for cotton AU - Xu, C. H. AU - Hinks, D. AU - Shamey, R. T2 - AATCC Review DA - 2011/// PY - 2011/// VL - 11 IS - 6 SP - 73-77 ER - TY - JOUR TI - Sulfonated Polystyrene Fiber Network-Induced Hybrid Proton Exchange Membranes AU - Yao, Yingfang AU - Ji, Liwen AU - Lin, Zhan AU - Li, Ying AU - Alcoutlabi, Mataz AU - Hamouda, Hechmi AU - Zhang, Xiangwu T2 - ACS APPLIED MATERIALS & INTERFACES AB - A novel type of hybrid membrane was fabricated by incorporating sulfonated polystyrene (S-PS) electrospun fibers into Nafion for the application in proton exchange membrane fuel cells. With the introduction of S-PS fiber mats, a large amount of sulfonic acid groups in Nafion aggregated onto the interfaces between S-PS fibers and the ionomer matrix, forming continuous pathways for facile proton transport. The resultant hybrid membranes had higher proton conductivities than that of recast Nafion, and the conductivities were controlled by selectively adjusting the fiber diameters. Consequently, hybrid membranes fabricated by ionomers, such as Nafion, incorporated with ionic-conducting nanofibers established a promising strategy for the rational design of high-performance proton exchange membranes. DA - 2011/9// PY - 2011/9// DO - 10.1021/am2009184 VL - 3 IS - 9 SP - 3732-3737 SN - 1944-8252 UR - https://publons.com/publon/6540072/ KW - hybrid materials KW - proton exchange membrane KW - electrospun fibers KW - sulfonated polystyrene KW - Nafion ER - TY - JOUR TI - Spectral Accuracy and Sulfur Counting Capabilities of the LTQ-FT-ICR and the LTQ-Orbitrap XL for Small Molecule Analysis AU - Blake, Samantha L. AU - Walker, S. Hunter AU - Muddiman, David C. AU - Hinks, David AU - Beck, Keith R. T2 - JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY AB - Color Index Disperse Yellow 42 (DY42), a high-volume disperse dye for polyester, was used to compare the capabilities of the LTQ-Orbitrap XL and the LTQ-FT-ICR with respect to mass measurement accuracy (MMA), spectral accuracy, and sulfur counting. The results of this research will be used in the construction of a dye database for forensic purposes; the additional spectral information will increase the confidence in the identification of unknown dyes found in fibers at crime scenes. Initial LTQ-Orbitrap XL data showed MMAs greater than 3 ppm and poor spectral accuracy. Modification of several Orbitrap installation parameters (e.g., deflector voltage) resulted in a significant improvement of the data. The LTQ-FT-ICR and LTQ-Orbitrap XL (after installation parameters were modified) exhibited MMA ≤ 3 ppm, good spectral accuracy (χ(2) values for the isotopic distribution ≤ 2), and were correctly able to ascertain the number of sulfur atoms in the compound at all resolving powers investigated for AGC targets of 5.00 × 10(5) and 1.00 × 10(6). DA - 2011/12// PY - 2011/12// DO - 10.1007/s13361-011-0244-3 VL - 22 IS - 12 SP - 2269-2275 SN - 1044-0305 KW - Electrospray ionization KW - FT-ICR-MS KW - Orbitrap-MS KW - Forensic analysis KW - Textiles KW - Trace evidence ER - TY - JOUR TI - Highly proton conductive electrolyte membranes: Fiber-induced long-range ionic channels AU - Yao, Yingfang AU - Guo, Bingkun AU - Ji, Liwen AU - Jung, Kyung-Hye AU - Lin, Zhan AU - Alcoutlabi, Mataz AU - Hamouda, Hechmi AU - Zhang, Xiangwu T2 - ELECTROCHEMISTRY COMMUNICATIONS AB - Novel conductive inorganic fiber/polymer hybrid proton exchange membranes (PEMs) were obtained by taking advantage of sulfated zirconia (S-ZrO2) fibers made by electrospinning and post-electrospinning processes. Induced by electrospun inorganic fibers, long-range ionic channels were formed by agglomerating functional groups, which served as continuous hopping pathways for protons and significantly improved the proton conductivity of PEMs. DA - 2011/9// PY - 2011/9// DO - 10.1016/j.elecom.2011.06.028 VL - 13 IS - 9 SP - 1005-1008 SN - 1388-2481 UR - https://publons.com/publon/6540067/ KW - Proton exchange membranes KW - Electrospun fibers KW - Functional polymers KW - Ionic channels KW - Proton conductivity ER - TY - JOUR TI - Laser Ablation Imparts Controlled Micro-Scale Pores in Electrospun Scaffolds for Tissue Engineering Applications AU - McCullen, S. D. AU - Gittard, S. D. AU - Miller, P. R. AU - Pourdeyhimi, Behnam AU - Narayan, R. J. AU - Loboa, E. G. T2 - ANNALS OF BIOMEDICAL ENGINEERING DA - 2011/12// PY - 2011/12// DO - 10.1007/s10439-011-0378-2 VL - 39 IS - 12 SP - 3021-3030 SN - 1573-9686 KW - Human adipose-derived stem cells KW - Laser ablation KW - Electrospun KW - Scaffold KW - Micro-machining ER - TY - JOUR TI - Fabrication and electrochemical characteristics of electrospun LiFePO4/carbon composite fibers for lithium-ion batteries AU - Toprakci, Ozan AU - Ji, Liwen AU - Lin, Zhan AU - Toprakci, Hatice A. K. AU - Zhang, Xiangwu T2 - JOURNAL OF POWER SOURCES AB - LiFePO4/C composite fibers were synthesized by using a combination of electrospinning and sol–gel techniques. Polyacrylonitrile (PAN) was used as an electrospinning media and a carbon source. LiFePO4 precursor materials and PAN were dissolved in N,N-dimethylformamide separately and they were mixed before electrospinning. LiFePO4 precursor/PAN fibers were heat treated, during which LiFePO4 precursor transformed to energy-storage LiFePO4 material and PAN was converted to carbon. The surface morphology and microstructure of the obtained LiFePO4/C composite fibers were characterized using scanning electron microscopy (SEM), transmission electron microscopy (TEM) and elemental dispersive spectroscopy (EDS). XRD measurements were also carried out in order to determine the structure of LiFePO4/C composite fibers. Electrochemical performance of LiFePO4/carbon composite fibers was evaluated in coin-type cells. Carbon content and heat treatment conditions (such as stabilization temperature, calcination/carbonization temperature, calcination/carbonization time, etc.) were optimized in terms of electrochemical performance. DA - 2011/9/15/ PY - 2011/9/15/ DO - 10.1016/j.jpowsour.2011.04.031 VL - 196 IS - 18 SP - 7692-7699 SN - 1873-2755 UR - https://publons.com/publon/674397/ KW - LiFePO4 KW - Cathodes KW - Fibers KW - Electrospinning KW - Lithium-ion batteries ER - TY - JOUR TI - Aerosol filtration properties of PA6/PE islands-in-the-sea bicomponent spunbond web fibrillated by high-pressure water jets AU - Yeom, Bong Yeol AU - Pourdeyhimi, Behnam T2 - JOURNAL OF MATERIALS SCIENCE DA - 2011/9// PY - 2011/9// DO - 10.1007/s10853-011-5531-7 VL - 46 IS - 17 SP - 5761-5767 SN - 0022-2461 ER - TY - JOUR TI - Recent developments in nanostructured anode materials for rechargeable lithium-ion batteries AU - Ji, Liwen AU - Lin, Zhan AU - Alcoutlabi, Mataz AU - Zhang, Xiangwu T2 - ENERGY & ENVIRONMENTAL SCIENCE AB - In this paper, the use of nanostructured anode materials for rechargeable lithium-ion batteries (LIBs) is reviewed. Nanostructured materials such as nano-carbons, alloys, metal oxides, and metal sulfides/nitrides have been used as anodes for next-generation LIBs with high reversible capacity, fast power capability, good safety, and long cycle life. This is due to their relatively short mass and charge pathways, high transport rates of both lithium ions and electrons, and other extremely charming surface activities. In this review paper, the effect of the nanostructure on the electrochemical performance of these anodes is presented. Their synthesis processes, electrochemical properties, and electrode reaction mechanisms are also discussed. The major goals of this review are to give a broad overview of recent scientific researches and developments of anode materials using novel nanoscience and nanotechnology and to highlight new progresses in using these nanostructured materials to develop high-performance LIBs. Suggestions and outlooks on future research directions in this field are also given. DA - 2011/8// PY - 2011/8// DO - 10.1039/c0ee00699h VL - 4 IS - 8 SP - 2682-2699 SN - 1754-5706 UR - https://publons.com/publon/6540060/ ER - TY - JOUR TI - Modeling instantaneous pressure drop of pleated thin filter media during dust loading AU - Fotovati, S. AU - Hosseini, S. A. AU - Tafreshi, H. Vahedi AU - Pourdeyhimi, B. T2 - CHEMICAL ENGINEERING SCIENCE AB - In this paper, we present a modeling methodology for studying the effects of dust loading on the pressure drop across pleated filters. Our simulations demonstrate that there exists an optimum pleat count for clean filters at which pressure drop reaches a minimum regardless of the in-plane or through-plane orientation of the fibers. With the particle deposition included in the analysis, our results indicated that the rate of increase in pressure drop decreases with increase in the pleat count. We demonstrated that a higher pleat count results in a higher flow velocity inside the pleat channels causing more non-uniformity in the dust deposition across the pleat. Especially when particles are sufficiently large, the dust cake tends to form deeper inside the pleated channel when the pleat count is high. This effect is observed to be less pronounced when the pleats have a triangular shape. We also showed that if the dust cake permeability is higher than that of the filters fibrous media, the rate of increase in pressure drop does not always decrease with increase in the pleat count. Finally, by comparing filters having 15 pleats per inch, we observed that rectangular pleats are preferred over the triangular pleats when the particles are highly inertial, i.e., filtering high-speed large particles. When particle's inertia is small, our results indicate that triangular pleats cause less pressure drop, and so are recommended. DA - 2011/9/15/ PY - 2011/9/15/ DO - 10.1016/j.ces.2011.05.038 VL - 66 IS - 18 SP - 4036-4046 SN - 1873-4405 KW - Aerosol KW - Filtration KW - Fluid mechanics KW - Porous media KW - Separation KW - CFD simulation ER - TY - JOUR TI - Hybrid Top-Down and Bottom-Up Fabrication Approach for Wafer-Scale Plasmonic Nanoplatforms AU - Dhawan, Anuj AU - Du, Yan AU - Batchelor, Dale AU - Wang, Hsin-Neng AU - Leonard, Donovon AU - Misra, Veena AU - Ozturk, Mehmet AU - Gerhold, Michael D. AU - Vo-Dinh, Tuan T2 - SMALL AB - A generalized hybrid nanofabrication approach is reported that combines top-down (deep-UV lithography) and bottom-up (controlled lateral epitaxial growth) fabrication techniques for developing nanostructured platforms. This technology allows the development of reproducible substrates with controlled sub-10-nm gaps between plasmonic nanostructures over an entire 6 inch wafer. The plasmonic nanoplatforms are used for surface-enhanced Raman scattering-based detection of chemical and biological molecules. Detailed facts of importance to specialist readers are published as ”Supporting Information”. Such documents are peer-reviewed, but not copy-edited or typeset. They are made available as submitted by the authors. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article. DA - 2011/3/21/ PY - 2011/3/21/ DO - 10.1002/smll.201002186 VL - 7 IS - 6 SP - 727-731 SN - 1613-6810 ER - TY - JOUR TI - Electrospun Carbon-Tin Oxide Composite Nanofibers for Use as Lithium Ion Battery Anodes AU - Bonino, Christopher A. AU - Ji, Liwen AU - Lin, Zhan AU - Toprakci, Ozan AU - Zhang, Xiangwu AU - Khan, Saad A. T2 - ACS APPLIED MATERIALS & INTERFACES AB - Composite carbon–tin oxide (C-SnO2) nanofibers are prepared by two methods and evaluated as anodes in lithium-ion battery half cells. Such an approach complements the long cycle life of carbon with the high lithium storage capacity of tin oxide. In addition, the high surface-to-volume ratio of the nanofibers improves the accessibility for lithium intercalation as compared to graphite-based anodes, while eliminating the need for binders or conductive additives. The composite nanofibrous anodes have first discharge capacities of 788 mAh g–1 at 50 mA g–1 current density, which are greater than pure carbon nanofiber anodes, as well as the theoretical capacity of graphite (372 mAh g–1), the traditional anode material. In the first protocol to fabricate the C-SnO2 composites, tin sulfate is directly incorporated within polyacrylonitrile (PAN) nanofibers by electrospinning. During a thermal treatment the tin salt is converted to tin oxide and the polymer is carbonized, yielding carbon-SnO2 nanofibers. In the second approach, we soak the nanofiber mats in tin sulfate solutions prior to the final thermal treatment, thereby loading the outer surfaces with SnO2 nanoparticles and raising the tin content from 1.9 to 8.6 wt %. Energy-dispersive spectroscopy and X-ray diffraction analyses confirm the formation of conversion of tin sulfate to tin oxide. Furthermore, analysis with Raman spectroscopy reveals that the additional salt soak treatment from the second fabrication approach increases in the disorder of the carbon structure, as compared to the first approach. We also discuss the performance of our C-SnO2 compared with its theoretical capacity and other nanofiber electrode composites previously reported in the literature. DA - 2011/7// PY - 2011/7// DO - 10.1021/am2004015 VL - 3 IS - 7 SP - 2534-2542 SN - 1944-8252 UR - https://publons.com/publon/674395/ KW - composite nanofibers KW - electrospinning KW - lithium-ion battery KW - tin oxide KW - anode ER - TY - JOUR TI - Durable antibacterial Ag/polyacrylonitrile (Ag/PAN) hybrid nanofibers prepared by atmospheric plasma treatment and electrospinning AU - Shi, Quan AU - Vitchuli, Narendiran AU - Nowak, Joshua AU - Caldwell, Jane M. AU - Breidt, Frederick AU - Bourham, Mohamed AU - Zhang, Xiangwu AU - McCord, Marian T2 - EUROPEAN POLYMER JOURNAL AB - Durable antibacterial Ag/polyacrylonitrile (Ag/PAN) hybrid nanofibers were prepared by atmospheric plasma treatment and electrospinning. Atmospheric helium plasma treatment was first used to reduce the AgNO3 precursor in pre-electrospinning solutions into metallic silver nanoparticles, followed by electrospinning into continuous and smooth nanofibers with Ag nanoparticles embedded in the matrix. SEM, TEM, and EDX spectra were used to study the structure and surface elemental composition of the nanofibers. Silver nanoparticles, with diameters ranging between 3 and 6 nm, were found to be uniformly dispersed in the nanofiber matrix. The Ag/PAN nanofibers exhibited slow and long-lasting silver ion release, which provided robust antibacterial activity against both Gram-positive Bacillus cereus and Gram-negative Escherichia coli microorganisms. DA - 2011/7// PY - 2011/7// DO - 10.1016/j.eurpolymj.2011.04.002 VL - 47 IS - 7 SP - 1402-1409 SN - 1873-1945 UR - https://publons.com/publon/3117884/ KW - Atmospheric plasma KW - Electrospinning KW - Nanofibers KW - Ag nanoparticles KW - Antibacterial activity ER - TY - JOUR TI - A Monte Carlo simulation of radiative heat through fibrous media: Effects of boundary conditions and microstructural parameters AU - Arambakam, R. AU - Hosseini, S. A. AU - Tafreshi, H. Vahedi AU - Pourdeyhimi, B. T2 - INTERNATIONAL JOURNAL OF THERMAL SCIENCES AB - This work reports on a Monte Carlo Ray Tracing (MCRT) simulation technique devised to study steady-state radiative heat transfer in fibrous insulation materials. The media consist of specular opaque fibers having unimodal/bimodal fiber diameter distributions. The simulations are conducted in 2-D ordered geometries, and the role of lateral symmetric or periodic boundary conditions are discussed in detail. Our results indicate that with the symmetric or periodic boundary condition, view factor Fi,i should be excluded from the calculations leading to temperature prediction. This is especially important when the media are made of fibers arranged in ordered configurations. In agreement with our previous 3-D MCRT simulations, the 2-D MCRT simulations presented here reveal that heat flux through a fibrous medium decreases by increasing packing fraction of the fibers, when fiber diameter is kept constant. Moreover, increasing fibers’ absorptivity was found to decrease the radiation transmittance through the media. In this work, we have also studied radiative heat transfer through bimodal fibrous media, and concluded that increasing fibers’ dissimilarity increases energy transmittance through the media, if porosity and number of fibers are kept constant. It was also found that temperature of the fibers is almost independent of the media’s porosity or diameter ratios. DA - 2011/6// PY - 2011/6// DO - 10.1016/j.ijthermalsci.2011.01.015 VL - 50 IS - 6 SP - 935-941 SN - 1290-0729 KW - Radiative heat transfer KW - Fibrous media KW - High-temperature insulation KW - Ray tracing ER - TY - JOUR TI - Solution Blowing of Soy Protein Fibers AU - Sinha-Ray, S. AU - Zhang, Y. AU - Yarin, A. L. AU - Davis, S. C. AU - Pourdeyhimi, B. T2 - BIOMACROMOLECULES AB - Solution blowing of soy protein (sp)/polymer blends was used to form monolithic nanofibers. The monolithic fibers were blown from blends of soy protein and nylon-6 in formic acid. The sp/nylon-6 ratio achieved in dry monolithic nanofibers formed using solution blowing of the blend was equal to 40/60. In addition, solution blowing of core-shell nanofibers was realized with soy protein being in the core and the supporting polymer in the shell. The shells were formed from nylon-6. The sp/nylon-6 ratio achieved in dry core-shell fibers was 32/68. The nanofibers developed in the present work contain significant amounts of soy protein and hold great potential in various applications of nonwovens. DA - 2011/6// PY - 2011/6// DO - 10.1021/bm200438v VL - 12 IS - 6 SP - 2357-2363 SN - 1525-7797 ER - TY - JOUR TI - Fabrication and characterization of LATP/PAN composite fiber-based lithium-ion battery separators AU - Liang, Yinzheng AU - Lin, Zhan AU - Qiu, Yiping AU - Zhang, Xiangwu T2 - ELECTROCHIMICA ACTA AB - Lithium aluminum titanium phosphate (LATP)/polyacrylonitrile (PAN) composite fiber-based membranes were prepared by electrospinning dispersions of LATP particles in PAN solutions. The electrolyte uptakes of the electrospun LATP/PAN composite fiber-based membranes were measured and the results showed that the electrolyte uptake increased as the LATP content increased. The lithium ion conductivity, the electrochemical oxidation limit and the interface resistance of liquid electrolyte-soaked electrospun LATP/PAN composite fiber-based membranes were also measured and it was found that as the LATP content increased, the electrospun LATP/PAN composite fiber-based membranes had higher lithium ion conductivity, better electrochemical stability, and lower interfacial resistance with lithium electrode. Additionally, lithium//1 M LiPF6/EC/EMC//lithium iron phosphate cells using LATP/PAN composite fiber-based membranes as the separator demonstrated high charge/discharge capacity and good cycle performance. DA - 2011/7/15/ PY - 2011/7/15/ DO - 10.1016/j.electacta.2011.05.007 VL - 56 IS - 18 SP - 6474-6480 SN - 0013-4686 UR - https://publons.com/publon/6540061/ KW - Lithium-ion batteries KW - Separators KW - Glass-ceramics KW - LATP KW - Electrospinning KW - Sol-gel ER - TY - JOUR TI - Structure and Tensile Properties of Nanoclay-Polypropylene Fibers Produced by Melt Spinning AU - Rangasamy, Loganathan AU - Shim, Eunkyoung AU - Pourdeyhimi, Behnam T2 - JOURNAL OF APPLIED POLYMER SCIENCE AB - Abstract Nanocomposite fibers of polypropylene and montmorillonite‐based organoclay were produced by a melt‐spinning process, and their structures and mechanical properties were studied. The addition of nanoclay in polypropylene increased the rate of crystallization and altered the microstructures of the fibers. Increases in the crystal size and a reduction in the molecular orientation were observed in the nanoclay–polypropylene composite fibers. The tensile properties of nanoclay composite fibers were also studied, and decreases in the fiber modulus and tenacity and increases in the strain at break were observed. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011 DA - 2011/7/5/ PY - 2011/7/5/ DO - 10.1002/app.33619 VL - 121 IS - 1 SP - 410-419 SN - 0021-8995 KW - additives KW - extrusion KW - fibers KW - nanocomposites KW - poly(propylene) (PP) ER - TY - JOUR TI - Lithium-oxygen batteries-Limiting factors that affect performance AU - Padbury, Richard AU - Zhang, Xiangwu T2 - JOURNAL OF POWER SOURCES AB - Lithium–oxygen batteries have recently received attention due to their extremely high theoretical energy densities, which far exceed that of any other existing energy storage technology. The significantly larger theoretical energy density of the lithium–oxygen batteries is due to the use of a pure lithium metal anode and the fact that the cathode oxidant, oxygen, is stored externally since it can be readily obtained from the surrounding air. Before the lithium–oxygen batteries can be realized as high performance, commercially viable products, there are still many challenges to overcome, from designing their cathode structure, to optimizing their electrolyte compositions and elucidating the complex chemical reactions that occur during charge and discharge. The scientific obstacles that are related to the performance of the lithium–oxygen batteries open up an exciting opportunity for researchers from many different backgrounds to utilize their unique knowledge and skills to bridge the knowledge gaps that exist in current research projects. This article is a summary of the most significant limiting factors that affect the performance of the lithium–oxygen batteries from the perspective of the authors. The article indicates the relationships that form between various limiting factors and highlights the complex yet captivating nature of the research within this field. DA - 2011/5/15/ PY - 2011/5/15/ DO - 10.1016/j.jpowsour.2011.01.032 VL - 196 IS - 10 SP - 4436-4444 SN - 1873-2755 UR - https://publons.com/publon/7178316/ KW - Lithium-oxygen battery KW - Reaction kinetics KW - Energy density KW - Electrode structure KW - Electrolyte ER - TY - JOUR TI - Electrocatalytic interaction of nano-engineered palladium on carbon nanofibers with hydrogen peroxide and beta-NADH AU - Lin, Zhan AU - Ji, Liwen AU - Medford, Andrew J. AU - Shi, Quan AU - Krause, Wendy E. AU - Zhang, Xiangwu T2 - JOURNAL OF SOLID STATE ELECTROCHEMISTRY DA - 2011/6// PY - 2011/6// DO - 10.1007/s10008-010-1218-2 VL - 15 IS - 6 SP - 1287-1294 SN - 1432-8488 UR - https://publons.com/publon/3117879/ KW - Electrodeposition KW - Pd KW - Carbon nanofibers KW - Hydrogen peroxide KW - beta-NADH ER - TY - JOUR TI - One-step synthesis of silver nanoparticle-filled nylon 6 nanofibers and their antibacterial properties AU - Shi, Quan AU - Vitchuli, Narendiran AU - Nowak, Joshua AU - Noar, Jesse AU - Caldwell, Jane M. AU - Breidt, Frederick AU - Bourham, Mohamed AU - McCord, Marian AU - Zhang, Xiangwu T2 - JOURNAL OF MATERIALS CHEMISTRY AB - A novel and facile one-step approach to in situ synthesize silver nanoparticle-filled nylon 6 nanofibers by electrospinning is reported. The method does not need post-treatments and can be carried out at ambient conditions without using additional chemicals. It employs the electrospinning solvent as a reducing agent for in situ conversion of AgNO3 into silver nanoparticles during the solution preparation. The resultant silver nanoparticle-filled nylon 6 hybrid nanofibers show an excellent fibrous structure (fiber diameter at 50–150 nm), with narrow size 2–4 nm silver nanoparticles uniformly dispersed throughout the nylon 6 matrix. DSC analysis shows that the in situ incorporation of silver nanoparticles increased the Tg and crystallinity of the resultant nanofibers. These silver nanoparticle-filled nylon 6 nanofibers exhibit a steady and long-lasting silver ion release behavior, and robust antibacterial activity against both Gram-positive B. cereus and Gram-negative E. coli microorganisms. DA - 2011/// PY - 2011/// DO - 10.1039/c1jm11492a VL - 21 IS - 28 SP - 10330-10335 SN - 1364-5501 UR - https://publons.com/publon/274770/ ER - TY - JOUR TI - Notes on the application of the standardized residual sum of squares index for the assessment of intra- and inter-observer variability in color-difference experiments AU - Melgosa, Manuel AU - Garcia, Pedro A. AU - Gomez-Robledo, Luis AU - Shamey, Renzo AU - Hinks, David AU - Cui, Guihua AU - Luo, M. Ronnier T2 - JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION AB - The standardized residual sum of squares index was proposed to examine the significant merit of a given color-difference formula over another with respect to a given set of visual color-difference data [J. Opt. Soc. Am. A 24, 1823-1829, 2007]. This index can also be employed to determine intra- and inter-observer variability, although the full complexity of this variability cannot be described by just one number. Appropriate utilization of the standardized residual sum of squares index for the assessment of observer variability is described with a view to encourage its use in future color-difference research. The main goal of this paper is to demonstrate that setting the F parameters of the standardized residual sum of squares index to 1 results in a loss of essential properties of the index (for example, symmetry), and is therefore strongly discouraged. DA - 2011/5// PY - 2011/5// DO - 10.1364/josaa.28.000949 VL - 28 IS - 5 SP - 949-953 SN - 1520-8532 ER - TY - JOUR TI - Preparation and electrochemical characterization of ionic-conducting lithium lanthanum titanate oxide/polyacrylonitrile submicron composite fiber-based lithium-ion battery separators AU - Liang, Yinzheng AU - Ji, Liwen AU - Guo, Bingkun AU - Lin, Zhan AU - Yao, Yingfang AU - Li, Ying AU - Alcoutlabi, Mataz AU - Qiu, Yiping AU - Zhang, Xiangwu T2 - JOURNAL OF POWER SOURCES AB - Lithium lanthanum titanate oxide (LLTO)/polyacrylonitrile (PAN) submicron composite fiber-based membranes were prepared by electrospinning dispersions of LLTO ceramic particles in PAN solutions. These ionic-conducting LLTO/PAN composite fiber-based membranes can be directly used as lithium-ion battery separators due to their unique porous structure. Ionic conductivities were evaluated after soaking the electrospun LLTO/PAN composite fiber-based membranes in a liquid electrolyte, 1 M lithium hexafluorophosphate (LiPF6) in ethylene carbonate (EC)/ethyl methyl carbonate (EMC) (1:1 vol). It was found that, among membranes with various LLTO contents, 15 wt.% LLTO/PAN composite fiber-based membranes provided the highest ionic conductivity, 1.95 × 10−3 S cm−1. Compared with pure PAN fiber membranes, LLTO/PAN composite fiber-based membranes had greater liquid electrolyte uptake, higher electrochemical stability window, and lower interfacial resistance with lithium. In addition, lithium//1 M LiPF6/EC/EMC//lithium iron phosphate cells containing LLTO/PAN composite fiber-based membranes as the separator exhibited high discharge specific capacity of 162 mAh g−1 and good cycling performance at 0.2 C rate at room temperature. DA - 2011/1/1/ PY - 2011/1/1/ DO - 10.1016/j.jpowsour.2010.06.088 VL - 196 IS - 1 SP - 436-441 SN - 1873-2755 UR - https://publons.com/publon/6540087/ KW - Lithium-ion batteries KW - Separators KW - Electrospinning KW - Submicron fibers KW - LLTO ER - TY - JOUR TI - Polypropylene Surface Modification with Stearyl Alcohol Ethoxylates to Enhance Wettability AU - Datla, Vasantha M. AU - Shim, Eunkyoung AU - Pourdeyhimi, Behnam T2 - JOURNAL OF APPLIED POLYMER SCIENCE AB - Stearyl alcohol ethoxylated additives were melt-blended in polypropylene (PP) films, and the characteristics of the modified films were investigated. The melt blending of stearyl alcohol ethoxylates improved the hydrophilicity of the PP films through additive surface segregation. Surface specific techniques, such as X-ray photoelectron spectroscopy and time-of-flight secondary-ion mass spectrometry, were used to study the surface compositions of the samples modified with ethoxylated additives. This revealed that the surface concentrations of the additives were significantly higher than the bulk concentrations in all samples. In addition, the surface compositions of the additive-modified samples continuously changed, even after the films were fully solidified. We also found that the resulting surface characteristics were very dynamic, so the melt-additive-containing polymer surfaces responded to water exposure, and their surface properties and morphologies were altered as a result. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011 DA - 2011/8/5/ PY - 2011/8/5/ DO - 10.1002/app.31051 VL - 121 IS - 3 SP - 1335-1347 SN - 0021-8995 KW - additives KW - blends KW - poly(propylene) (PP) KW - surfaces ER - TY - JOUR TI - Meltblowing: Multiple polymer jets and fiber-size distribution and lay-down patterns AU - Yarin, A. L. AU - Sinha-Ray, S. AU - Pourdeyhimi, B. T2 - POLYMER AB - In this work a comprehensive model of three-dimensional configurations of polymer jets in meltblowing from die exit to deposition screen is developed. In addition, multiple jets were modeled simultaneously, as well as deposition on a screen moving normally to the principal jet direction was accounted for. All important properties of polymer melts are used in the simulations, namely density, zero-shear viscosity and the viscoelastic relaxation time. In addition, the material parameters responsible for the temperature-dependent variation of the material properties are used. All the other parameters are the operational parameters characterizing gas flow. The results include prediction of the fiber deposition patterns and fiber-size distributions in the resulting nonwovens. The angular distributions in lay-down nonwovens are also predicted. Comparisons with the experimental data suggest that the model captures main trends rather accurately. DA - 2011/6/8/ PY - 2011/6/8/ DO - 10.1016/j.polymer.2011.04.039 VL - 52 IS - 13 SP - 2929-2938 SN - 0032-3861 KW - Meltblowing KW - Multiple polymer jets KW - Turbulent flow field ER - TY - JOUR TI - Development of a Comprehensive Visual Dataset Based on a CIE Blue Color Center: Assessment of Color Difference Formulae Using Various Statistical Methods AU - Lee, Seung Geol AU - Shamey, Renzo AU - Hinks, David AU - Jasper, Warren T2 - COLOR RESEARCH AND APPLICATION AB - The objectives of this work were to develop a comprehensive visual dataset around one CIE blue color center, NCSU-B1, and to use the new dataset to test the performance of the major color difference formulae in this region of color space based on various statistical methods. The dataset comprised of 66 dyed polyester fabrics with small color differences () around a CIE blue color center. The visual difference between each sample and the color center was assessed by 26 observers in three separate sittings using a modified AATCC gray scale and a total of 5148 assessments were obtained. The performance of CIELAB, CIE94, CMC(l:c), BFD(l:c), and CIEDE2000 (KL:KC:KH) color difference formulae based on the blue dataset was evaluated at various KL (or l) values using PF/3, conventional correlation coefficient (r), Spearman rank correlation coefficient (ρ) and the STRESS function. The optimum range for KL (or l) was found to be 1–1.3 based on PF/3, 1.4–1.7 based on r, and 1–1.4 based on STRESS, and in these ranges the performances of CIEDE2000, CMC, BFD and CIE94 were not statistically different at the 95% confidence level. At KL (or l) = 1, the performance of CIEDE2000 was statistically improved compared to CMC, CIE94 and CIELAB. Also, for NCSU-B1, the difference in the performance of CMC (2:1) from the performance of CMC (1:1) was statistically insignificant at 95% confidence. The same result was obtained when the performance of all the weighted color difference formulae were compared for KL (or l) 1 versus 2. © 2009 Wiley Periodicals, Inc. Col Res Appl, 2011 DA - 2011/2// PY - 2011/2// DO - 10.1002/col.20549 VL - 36 IS - 1 SP - 27-41 SN - 1520-6378 KW - color difference KW - visual assessment KW - gray scale KW - PF/3 KW - STRESS KW - CIE blue color center ER - TY - JOUR TI - Review of retail store lighting: implications for colour control of products AU - Hinks, David AU - Shamey, Renzo T2 - COLORATION TECHNOLOGY AB - Lighting variables directly impact all areas of colour science. Lighting is of critical concern to the effective and consistent control of the perceived colour of all products. It is therefore important that all stakeholders involved in managing a commercial supply chain, including product design, colour standards development, manufacture and point of sale, work to understand and control the lighting environment during each stage of a product’s life cycle. New examples of lighting variability in a small and large US retail chain store are presented to illustrate key concepts. Some of the recent published work on retail lighting is reviewed, as well as some of the likely future directions of retail lighting in terms of environmental and technology development. DA - 2011/// PY - 2011/// DO - 10.1111/j.1478-4408.2011.00286.x VL - 127 IS - 2 SP - 121-128 SN - 1478-4408 ER - TY - JOUR TI - Finite element modelling of thermally bonded bicomponent fibre nonwovens: Tensile behaviour AU - Demirci, Emrah AU - Acar, Memis AU - Pourdeyhimi, Behnam AU - Silberschmidt, Vadim V. T2 - COMPUTATIONAL MATERIALS SCIENCE AB - Nonwovens are polymer-based engineered textiles with a random microstructure and hence require a numerical model to predict their mechanical performance. This paper focuses on finite element (FE) modelling the elastic–plastic mechanical response of polymer-based core/sheath type thermally bonded bicomponent fibre nonwoven materials. The nonwoven fabric is treated as an assembly of two regions having distinct mechanical properties: fibre matrix and bond points. The fibre matrix is composed of randomly oriented core/sheath type fibres acting as load-transfer link between bond points. Random orientation of individual fibres is introduced into the model in terms of the orientation distribution function (ODF) in order to determine the material’s anisotropy. The ODF is obtained by analysing the data acquired with scanning electron microscopy (SEM) and X-ray micro computed tomography (CT). On the other hand, bond points are treated as a deformable bicomponent composite material composed of the sheath material as matrix and the core material as fibres having random orientations. An algorithm is developed to calculate the anisotropic material properties of these regions based on properties of fibres and manufacturing parameters such as the planar density, core/sheath ratio and fibre diameter. Having distinct anisotropic mechanical properties for two regions, the fabric is modelled with shell elements with thicknesses identical to those of the bond points and fibre matrix. Finally, nonwoven specimens are subjected to tensile tests along different loading directions with respect to the machine direction of the fabric. The force–displacement curves obtained in these tests are compared with the results of FE simulations. DA - 2011/2// PY - 2011/2// DO - 10.1016/j.commatsci.2010.02.039 VL - 50 IS - 4 SP - 1286-1291 SN - 1879-0801 KW - Thermally bonded nonwoven KW - Bicomponent fibre KW - Orientation distribution function KW - Finite element analysis KW - Anisotropy ER - TY - JOUR TI - Analytical expressions for predicting performance of aerosol filtration media made up of trilobal fibers AU - Fotovati, S. AU - Tafreshi, H. Vahedi AU - Pourdeyhimi, B. T2 - JOURNAL OF HAZARDOUS MATERIALS AB - Despite the widespread use of fibrous filtration media made up of trilobal fibers (referred to as trilobal media here), no mathematical formulations have yet been developed to predict their collection efficiency or pressure drop. In this study, we model the cross-section of a trilobal fiber with three overlapping ellipses separated from one another by a 120° transformation. We generate 2-D models representing the internal structure of trilobal filters having fibers with different dimensions and aspect ratios, and used them to predict pressure drop and collection efficiency of trilobal filter media. This information is then utilized to define an equivalent medium with circular fibers for each trilobal filter. Our results indicate that the circumscribed circle of a trilobal fiber can serve as an equivalent circular diameter, and therefore be used in the existing empirical/semi-empirical correlations that have previously been developed for predicting performance of filters with circular fibers. We have also proposed easy-to-use expressions that can be used with our equivalent circumscribed diameters for calculating the pressure drop of trilobal media. DA - 2011/2/28/ PY - 2011/2/28/ DO - 10.1016/j.jhazmat.2010.12.027 VL - 186 IS - 2-3 SP - 1503-1512 SN - 1873-3336 KW - Aerosol filtration KW - Trilobal fibers KW - CFD simulation ER - TY - JOUR TI - Adapting lean manufacturing principles to the textile industry AU - Hodge, George L. AU - Ross, Kelly Goforth AU - Joines, Jeff A. AU - Thoney, Kristin T2 - PRODUCTION PLANNING & CONTROL AB - A research project was conducted to determine which lean principles are appropriate for implementation in the textile industry. Lean manufacturing involves a variety of principles and techniques, all of which have the same ultimate goal: to eliminate waste and non-value-added activities at every production or service process in order to give the most satisfaction to the customer. To stay competitive, many US textile manufacturers have sought to improve their manufacturing processes so that they can more readily compete with overseas manufacturers. This study identifies the different tools and principles of lean. The use of lean manufacturing in the textile industry was examined in this research through interviews, plant tours and case studies. A model for implementing lean tools and principles in a textile environment was developed. DA - 2011/// PY - 2011/// DO - 10.1080/09537287.2010.498577 VL - 22 IS - 3 SP - 237-247 SN - 0953-7287 KW - lean manufacturing KW - textiles KW - value stream mapping ER - TY - JOUR TI - Web fabrication and characterization of unique winged shaped, area-enhanced fibers via a bicomponent spunbond process AU - Yeom, Bong Yeol AU - Pourdeyhimi, Behnam T2 - JOURNAL OF MATERIALS SCIENCE DA - 2011/5// PY - 2011/5// DO - 10.1007/s10853-010-5212-y VL - 46 IS - 10 SP - 3252-3257 SN - 1573-4803 ER - TY - JOUR TI - Atmospheric Plasma Treatment of Pre-Electrospinning Polymer Solution: A Feasible Method to Improve Electrospinnability AU - Shi, Quan AU - Vitchuli, Narendiran AU - Nowak, Joshua AU - Lin, Zhan AU - Guo, Bingkun AU - McCord, Marian AU - Bourham, Mohamed AU - Zhang, Xiangwu T2 - JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS AB - Abstract The electrospinnability of polyethylene oxide (PEO) was manipulated by atmospheric plasma treatment of pre‐electrospinning solutions. Conductivity, viscosity, and surface tension of PEO solutions increased after plasma treatment, and the plasma effect remained longer when the solution concentrate increased. Both untreated and treated solutions were then electrospun, and the morphology of the resultant nanofibers was observed by SEM. Atmospheric plasma treatment improved the electrospinnability of PEO solutions and led to less beads and finer diameter distribution in the resultant nanofibers. Additionally, plasma treatment of the pre‐electrospinning solutions affected the crystal structure of resultant nanofibers. These results suggest that atmospheric plasma treatment is a feasible approach to improve the electrospinnability of polymer solutions and can used to control the structure of electrospun nanofibers. © 2010 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys, 2011 DA - 2011/1/15/ PY - 2011/1/15/ DO - 10.1002/polb.22157 VL - 49 IS - 2 SP - 115-122 SN - 1099-0488 UR - https://publons.com/publon/3117880/ KW - atmospheric plasma KW - electrospinning KW - fibers KW - melting point KW - nanofibers KW - poly(ethylene oxide) ER - TY - JOUR TI - Synthesis and Characterization of Polymer-Filled Nonwoven Membranes AU - Jung, Kyung-Hye AU - Pourdeyhimi, Behnam AU - Zhang, Xiangwu T2 - JOURNAL OF APPLIED POLYMER SCIENCE AB - Abstract Polymer‐filled nonwoven membranes were prepared by filling the open pores of nylon nonwovens with poly(2‐acrylamido‐2‐methyl‐1‐propanesulfonic acid) (PAMPS). PAMPS was synthesized via radical polymerization and crosslinked to prevent its dissolution in water. PAMPS‐filled nylon nonwoven membranes showed enhanced dimensional stability and mechanical properties when compared with PAMPS membranes without nonwovens. The conductivities of PAMPS‐filled nylon nonwovens were slightly lower than those of PAMPS membranes. Compared with PAMPS membranes without nonwoven hosts, both linear and crosslinked PAMPS‐filled nylon nonwoven membranes exhibited lower vapor permeabilities for water, methanol, acetone, and dimethyl methylphophonate (DMMP). In addition, crosslinked PAMPS‐filled nonwoven membranes presented high permselectivity on DMMP over water, which is critical for chemical protection application. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010 DA - 2011/3/5/ PY - 2011/3/5/ DO - 10.1002/app.32611 VL - 119 IS - 5 SP - 2568-2575 SN - 1097-4628 UR - https://publons.com/publon/7178333/ KW - barrier KW - composites KW - fibers ER - TY - JOUR TI - Scaffolds for drug delivery, part I: electrospun porous poly(lactic acid) and poly(lactic acid)/poly(ethylene oxide) hybrid scaffolds AU - Honarbakhsh, Sara AU - Pourdeyhimi, Behnam T2 - JOURNAL OF MATERIALS SCIENCE DA - 2011/5// PY - 2011/5// DO - 10.1007/s10853-010-5161-5 VL - 46 IS - 9 SP - 2874-2881 SN - 1573-4803 ER -