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Research Summary

We are developing micromachined sensors, actuators and microfluidic components for handling a small quantity of liquid and gas samples for bio/chemical applications. The scale of sensor and surrounding components ranges from nanometers to millimeters. Majority of our research is currently supported by the National Science Foundation.

List of Publications

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R. Shabani, R. Kumar, and H. J. Cho, “Droplets on liquid surfaces: Dual equilibrium states and their energy barrier,” Applied Physics Letters, vol. 102, no. 18, p. 184101, 2013.

R. Shabani and H. J. Cho, “Flow rate analysis of an EWOD-based device: how important are wetting-line pinning and velocity effects?,” Microfluidics and Nanofluidics, Apr. 2013.

R. Shabani and H. J. Cho, “Active surface tension driven micropump using droplet/meniscus pressure gradient,” Sensors and Actuators B: Chemical, vol. 180, pp. 114-121, Apr. 2013.

J. Lee, J. Kim, H. Kim, Y. M. Bae, K.-H. Lee, and H. J. Cho, “Effect of thermal treatment on the chemical resistance of polydimethylsiloxane for microfluidic devices,” Journal of Micromechanics and Microengineering, vol. 23, no. 3, p. 035007, Mar. 2013.doi:10.1088/0960-1317/23/3/035007

S.-H. Bae, O. Kahya, B. K. Sharma, J. Kwon, H. J. Cho, B. zyilmaz, and J.-H. Ahn, “Graphene-P(VDF-TrFE) Multilayer Film for Flexible Applications,” ACS Nano, vol. 7, no. 4, pp. 3130-3138, Apr. 2013.

R. McCormack, N. Shirato, U. Singh, S. Das, A. Kumar, H. J. Cho, R. Kalyanaraman, and S. Seal, “Laser irradiated nano-architectured undoped tin oxide arrays: mechanism of ultrasensitive room temperature hydrogen sensing,” Nanoscale, vol. 4, no. 22, pp. 7256-7265, 2012.

R. Shabani and H. J. Cho, “Review of Nanomaterials in Actuators”, Reviews in Nanoscience and Nanotechnology, pp. 85-102, vol. 1, 2012.

E. Yakhshi-Tafti, R. Kumar, and H. J. Cho, “Measurement of Surface Interfacial Tension as a Function of Temperature Using Pendant Drop Images,” International Journal of Optomechatronics, vol. 5, no. 4, pp. 393-403, 2011.

R. Shabani and H. J. Cho, “A micropump controlled by EWOD: wetting line energy and velocity effects”, Lab Chip, pp. 3401-3403, Vol. 11, 2011. 

H. A. Lee, Y.-C. Byun, U. Singh, H. J. Cho and H. Kim, “Surface Modification of Carbon Post Arrays by Atomic Layer Deposition of ZnO Film”, pp. 7322-7326, Vol. 11, No. 8, 2011. DOI: 10.1166/jnn.2011.4827

S.-E. Zhu, R. Shabani, J. Rho, Y. Kim, B, Hong, J.-H. Ahn and H. J. Cho, “Graphene-based Bimorph Microactuators,” Nano Letters, pp.977-981, Vol. 11, 2011. DOI: 10.1021/nl103618e

E. Yakhshi-Tafti, G. Londe, A. Chunder, L. Zhai, R. Kumar, and H. J. Cho, “Wettability Control and Flow Regulation Using a Nanostructure-Embedded Surface,” Journal of Nanoscience and Nanotechnology, pp. 1417-1420, Vol. 11, No. 2, 2011, DOI: 10.1166/jnn.2011.3400 

N. Shirato, J. Strader, A. Kumar. A. Vincent, P. Zhang, A. Karaoki, P. Nacchimuthu, H. J. Cho. S. Seal and R. Kalyanaraman, “Thickness dependent self limiting 1-D tin oxide nanowire arrays by nanosecond pulsed laser irradiation,” Nanoscale, pp.1090-1101, Vol. 3, 2011.  DOI: 10.1039/C0NR00689K 

E. Yakhshi-Tafti, H. J. Cho, and R. Kumar, “Diffusive Mixing Through Velocity Profile Variation in Microchannels”, Experiments in Fluids, pp. 535-545, Vol. 50, No. 3, pp.535-545, 2011, DOI 10.1007/s00348-010-0954-5 

E. Yakhshi-Tafti, H. J. Cho, and R. Kumar, “Impact of drops on the surface of immiscible liquids,” Journal of Colloid and Interface Science,pp.373-376, Vol. 350, No. 1, 2010, doi:10.1016/j.jcis.2010.06.029

E.Yakhshi-Tafti, H. J. Cho and R. Kumar, “Droplet actuation on a liquid layer due to thermocapillary motion: Shape effect”, Applied Physics Letters, 264101 (3 pages), Vol.. 96,  2010

P. Zhang, A. Vincent, A. Kumar, S. Seal and H. J. Cho, “A Low-Energy Room-Temperature Hydrogen Nanosensor: Utilizing the Schottky Barriers at the Electrode/Sensing-Material Interfaces”, IEEE Electron Device Letters, pp. 770-772, Vol. 31, Issue 7, 2010

G. Londe, A. Chunder, L. Zhai and H. J. Cho, “An Analytical Model for Wettability Switching Characteristic of a Nanostructured Thermoresponsive Surface”, Applied Physics Letters, 164104, Vol. 94, 2009

A. Chunder, K. Etcheverry, G. Londe, H. J. Cho and L. Zhai, “Conformal switchable superhydrophobic/hydrophilic surfaces for microscale flow control”, Colloids and Surfaces A: Physicochem. Eng. Aspects, pp. 187-193,  Vol. 333, 2009