@article{ding_vallabhuneni_liu_wang_zhao_wang_tang_wang_zhang_kota_et al._2023, title={Eu<SUP>3+</SUP> Complex-Based Superhydrophobic Fluorescence Sensor for Cr(VI) Detection in Water}, volume={13}, ISSN={["2079-4991"]}, DOI={10.3390/nano13182574}, abstractNote={Cr(VI) compounds are bioaccumulative and highly toxic pollutants, and there is a need for simple and fast detection methods to monitor their trace levels. In this work, we developed a Eu3+ complex-based fluorescence sensor to easily detect Cr(VI) in water droplets. Our sensor consists of a nanofibrous membrane electrospun with a blend of polyvinylidene fluoride (PVDF), silica particles, and Eu3+ complex. Upon modifying the membrane surface with fluoroalkyl chemistry, the sensor displayed superhydrophobicity. When a water droplet with Cr(VI) was placed on such a superhydrophobic fluorescence sensor, the overlapping absorption of Cr(VI) and Eu3+ complex facilitated the inner filter effect, allowing the selective detection of Cr(VI) down to 0.44 µM (i.e., 45.76 µg L−1). We proposed and designed of new inexpensive and fast sensor for the detection of Cr(VI).}, number={18}, journal={NANOMATERIALS}, author={Ding, Wei and Vallabhuneni, Sravanthi and Liu, Jin and Wang, Xinzhi and Zhao, Yue and Wang, Yao and Tang, Qinglin and Wang, Yanxin and Zhang, Xiaolin and Kota, Arun Kumar and et al.}, year={2023}, month={Sep} }
 @article{sutherland_rather_sabino_vallabhuneni_wang_popat_kota_2023, title={Hemp-Based Sustainable Slippery Surfaces: Icephobic and Antithrombotic Properties}, volume={11}, ISSN={["2168-0485"]}, url={https://doi.org/10.1021/acssuschemeng.2c06233}, DOI={10.1021/acssuschemeng.2c06233}, abstractNote={With the passage of the 2018 Farm Bill that removed hemp from the Controlled Substances Act altogether, production of hemp is experiencing a renaissance. Building on this revival and re-emergence of hemp, we designed and fabricated hemp-based sustainable and robust slippery surfaces by coating hemp paper with beeswax and subsequently infusing it with hemp oil. A wide variety of aqueous liquids and beverages easily slide on our hemp-based sustainable slippery surfaces, without leaving a trace. We also fabricated hemp-based sustainable slippery surfaces using different textured metals. Our hemp-based sustainable slippery metal surfaces display good icephobic and antithrombotic properties. With these attributes, we envision that our hemp-based sustainable slippery surfaces will pave the path to more safe, non-toxic, and biodegradable or recyclable slippery surfaces for applications in food packaging, anti-icing or de-icing coatings, and antithrombotic medical devices.}, number={6}, journal={ACS SUSTAINABLE CHEMISTRY & ENGINEERING}, author={Sutherland, Daniel J. and Rather, Adil M. and Sabino, Roberta M. and Vallabhuneni, Sravanthi and Wang, Wei and Popat, Ketul C. and Kota, Arun K.}, year={2023}, month={Feb} }
 @article{kantam_manivasagam_jammu_sabino_vallabhuneni_kim_kota_popat_2023, title={Interaction of Blood and Bacteria with Slippery Hydrophilic Surfaces}, ISSN={["2196-7350"]}, DOI={10.1002/admi.202300564}, abstractNote={Abstract}, journal={ADVANCED MATERIALS INTERFACES}, author={Kantam, Prem and Manivasagam, Vignesh K. and Jammu, Tarun Kumar and Sabino, Roberta Maia and Vallabhuneni, Sravanthi and Kim, Young Jae and Kota, Arun K. and Popat, Ketul C.}, year={2023}, month={Oct} }
 @article{movafaghi_vallabhuneni_wang_jathar_kota_2023, title={Rapid and Onsite Detection of Fuel Adulteration}, ISSN={["1520-5827"]}, DOI={10.1021/acs.langmuir.3c00578}, abstractNote={In numerous developing countries, the lower cost of subsidized liquid fuels such as kerosene compared to market-rate fuels often results in fuel adulteration. Such misuse of kerosene is hard to detect with conventional detection technologies because they are either time consuming, expensive, not sensitive enough or require well-equipped analytical laboratories. In this work, we developed an inexpensive and easy-to-use device for rapid and onsite detection of fuel adulteration. The working principle of our fuel adulteration detection is sensing changes in the mobility of fuel droplets on non-textured (i.e., smooth) and non-polar solid surfaces. Using our device, we demonstrated rapid detection of diesel (market-rate fuel) adulterated with kerosene (subsidized fuel) at concentrations an order of magnitude below typical adulteration concentrations. We envision that our inexpensive, easy-to-use, and field-deployable device as well as the design strategy will pave the way for novel fuel quality sensors.}, journal={LANGMUIR}, author={Movafaghi, Sanli and Vallabhuneni, Sravanthi and Wang, Wei and Jathar, Shantanu and Kota, Arun K.}, year={2023}, month={Jun} }
 @article{vahabi_vallabhuneni_hedayati_wang_krapf_kipper_miljkovic_kota_2022, title={Designing non-textured, all-solid, slippery hydrophilic surfaces}, volume={5}, ISSN={["2590-2385"]}, DOI={10.1016/j.matt.2022.09.024}, abstractNote={Slippery surfaces are sought after due to their wide range of applications in self-cleaning, drag reduction, fouling-resistance, enhanced condensation, biomedical implants etc. Recently, non-textured, all-solid, slippery surfaces have gained significant attention because of their advantages over super-repellent surfaces and lubricant-infused surfaces. Currently, almost all non-textured, all-solid, slippery surfaces are hydrophobic. In this work, we elucidate the systematic design of non-textured, all-solid, slippery hydrophilic (SLIC) surfaces by covalently grafting polyethylene glycol (PEG) brushes to smooth substrates. Furthermore, we postulate a plateau in slipperiness above a critical grafting density, which occurs when the tethered brush size is equal to the inter-tether distance. Our SLIC surfaces demonstrate exceptional performance in condensation and fouling-resistance compared to non-slippery hydrophilic surfaces and slippery hydrophobic surfaces. Based on these results, SLIC surfaces constitute an emerging class of surfaces with the potential to benefit multiple technological landscapes ranging from thermofluidics to biofluidics.}, number={12}, journal={MATTER}, author={Vahabi, Hamed and Vallabhuneni, Sravanthi and Hedayati, Mohammadhasan and Wang, Wei and Krapf, Diego and Kipper, Matt J. and Miljkovic, Nenad and Kota, Arun K.}, year={2022}, month={Dec}, pages={4502–4512} }
 @article{wang_sun_vallabhuneni_pawlowski_vahabi_nellenbach_brown_scholle_zhao_kota_2022, title={On-demand, remote and lossless manipulation of biofluid droplets}, ISSN={["2051-6355"]}, DOI={10.1039/d2mh00695b}, abstractNote={To minimize exposure of healthcare workers and clinical laboratory personnel to infectious liquids, we designed biofluid manipulators for on-demand handling of liquid droplets, in-plane or out-of-plane, in a remote and lossless manner.}, journal={MATERIALS HORIZONS}, author={Wang, Wei and Sun, Jiefeng and Vallabhuneni, Sravanthi and Pawlowski, Benjamin and Vahabi, Hamed and Nellenbach, Kimberly and Brown, Ashley C. and Scholle, Frank and Zhao, Jianguo and Kota, Arun K.}, year={2022}, month={Sep} }
 @article{channon_menger_wang_carrao_vallabhuneni_kota_henry_2021, title={Design and application of a self-pumping microfluidic staggered herringbone mixer}, volume={25}, ISSN={["1613-4990"]}, DOI={10.1007/s10404-021-02426-x}, number={4}, journal={MICROFLUIDICS AND NANOFLUIDICS}, author={Channon, Robert B. and Menger, Ruth F. and Wang, Wei and Carrao, Daniel B. and Vallabhuneni, Sravanthi and Kota, Arun K. and Henry, Charles S.}, year={2021}, month={Mar} }
 @article{hatoum_vallabhuneni_kota_bark_popat_dasi_2020, title={Impact of superhydrophobicity on the fluid dynamics of a bileaflet mechanical heart valve}, volume={110}, ISSN={["1878-0180"]}, DOI={10.1016/j.jmbbm.2020.103895}, abstractNote={The objective of this study is to evaluate the impact of superhydrophobic coating on the hemodynamics and turbulence characteristics of a bileaflet mechanical valve in the context of evaluating blood damage potential. Two 3D printed bileaflet mechanical valves were hemodynamically tested in a pulse duplicator under physiological pressure and flow conditions. The leaflets of one of the two valves were sprayed with a superhydrophobic coating. Particle Image Velocimetry was performed. Pressure gradients (PG), effective orifice areas (EOA), Reynolds shear stresses (RSS) and instantaneous viscous shear stresses (VSS) were calculated. (a) Without SH coating, the PG was found to be 14.53 ± 0.7 mmHg and EOA 1.44 ± 0.06 cm2. With coating, the PG obtained was 15.21 ± 1.7 mmHg and EOA 1.39 ± 0.07 cm2; (b) during peak systole, the magnitude of RSS with SH coating (110Pa) exceeded that obtained without SH coating (40 Pa) with higher probabilities to develop higher RSS in the immediate wake of the leaflet; (c) The magnitudes range of instantaneous VSS obtained with SH coating were slightly larger than those obtained without SH coating (7.0 Pa versus 5.0 Pa). With Reynolds Shear Stresses and instantaneous Viscous Shear Stresses being correlated with platelet damage, SH coating did not lead to their decrease. While SH coating is known to improve surface properties such as reduced platelet or clot adhesion, the relaxation of the slip condition does not necessarily improve overall hemodynamic performance for the bileaflet mechanical valve design.}, journal={JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS}, author={Hatoum, Hoda and Vallabhuneni, Sravanthi and Kota, Arun Kumar and Bark, David L. and Popat, Ketul C. and Dasi, Lakshmi Prasad}, year={2020}, month={Oct} }