Dr. Choi analyses Nanopatterning and Nanostructure Fabrication, where the concentration is to develop simple but efficient methods of nanofabrication that display superior pattern regularity, size, and shape over a large area. This research improves upon standard lithography methods such as e-beam or scanning probe lithography, which do not cover an area large enough to successfully employ electronic applications. Dr. Choi is also involved in Biomaterials and Nanobio-Science/Engineering, in which their well-defined nanostructured surfaces provide a unique opportunity, whereby the well-controlled surface structures in the nanoscale can elucidate many aspects of the nanobiology of the cell. It can further lead to novel applications to bioengineering such as implanting biomedical devices and tissue engineering.
Dr. Choi’s work has resulted in NSF Fellowship, Korea-U.S. Science Cooperation Center (KUSCO) and Korean-American Scientists and Engineering Association (KSEA) awards.
He has contributed to many publications and conference proceedings, as well as a book entitled, "Design, Fabrication, and Applications of Large-Area Well-Ordered Dense-Array Three-Dimensional Nanostructures", Nanostructures in Electronics and Photonics, Faiz Rahman, Pan Stanford Publishing. (2008). His research has also recognized as a Research Highlight in the journal Nature, in which he demonstrates that textured hydrophobic surfaces can achieve slip lengths almost 10 times longer than previously achieved. Such work could potentially be used to significantly reduce drag in fluidics applications. |
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K. Schenke-Layland, F. Rofail, S. Heydarkhan, J. M. Gluck, N. P. Ingle, E. Angelis, C.-H. Choi, W. R. MacLellan, R. E Beygui, R. J. Shemin, S. Heydarkhan-Hagvall. (2009). The use of three-dimensional nanostructures to instruct cells to produce extracellular matrix for regenerative medicine strategies, Biomaterials 30. 4665-4675 . Link
C. Lee, C.-H. Choi, C.-J. Kim. (Jun 2008). Structured Surfaces for a Giant Liquid Slip, Physical Review Letters 101, 064501 (2008). Link
C.-H. Choi, S. H. Hagvall, B. M. Wu, J. C. Y. Dunn, R. E. Beygui, C.-J. Kim. Cell Interaction with Three-Dimensional Sharp-Tip Nanotopography, Biomaterials 28, 1672-1679 (2007). Link
C.-H. Choi, C.-J. Kim. Fabrication of Dense Array of Tall Nanostructures over a Large Sample Area with Sidewall Profile and Tip Sharpness Control, Nanotechnology 17, 5326-5333 (2006). Link
C.-H. Choi, C.-J. Kim. Choi and Kim Reply (A Reply to the Comment on ‘Large Slip of Aqueous Liquid Flow over a Nanoengineered Superhydrophobic Surface’), Physical Review Letters 97, 109602 (2006)
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C.-H. Choi, U. Ulmanella, J. Kim, C.-M. Ho, C.-J. Kim. Effective Slip and Friction Reduction in Nanograted Superhydrophobic Microchannels, Physics of Fluids 18, 087105 (2006) (also in Virtual Journal of Nanoscale Science & Technology 14(10), September 4, 2006)
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C.-H. Choi, C.-J. Kim. Large Slip of Aqueous Liquid Flow over a Nanoengineered Superhydrophobic Surface, Physical Review Letters 96, 066001 (2006) (also in Virtual Journal of Nanoscale Science & Technology, 13(8), February 27, 2006). Link
C.-H. Choi, K. J. A. Westin, K. S. Breuer. Apparent Slip Flows in Hydrophilic and Hydrophobic Microchannels, Physics of Fluids 15, 2897-2902 (2003)
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K. J. A. Westin, C.-H. Choi, K. S. Breuer. A Novel System for Measuring Liquid Flow Rates with Nanoliter per Minute Resolution, Experiments in Fluids 34, 635-642 (2003). Link
C.-H. Choi, S. H. Hagvall, B. M. Wu, J. C. Y. Dunn, R. E. Beygui, C.-J. Kim. Cell Growth as a Sheet on Three-Dimensional Sharp-Tip Nanostructures, Journal of Biomedical Materials Research 89A, 804-817 (2009). Link
S. Heydarkhan-Hagvall, C.-H. Choi, J. Dunn, S. Heydarkhan, K. Schenke-Layland, W. R. MacLellan, R. E. Beygui. Influence of Systematically Varied Nano-Scale Topography on Cell Morphology and Adhesion, Cell Communication & Adhesion 14, 181-194 (2007)
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C.-H. Choi, C.-J. Kim. Droplet Evaporation of Pure Water and Protein Solution on Nanostructured Superhydrophobic Surfaces of Varying Heights, Langmuir 25, 7561-7567 (2009). Link
C.-H. Choi, C.-J. Kim. Design, Fabrication, and Applications of Large-Area Well-Ordered Dense-Array Three-Dimensional Nanostructures, Nanostructures in Electronics and Photonics, Faiz Rahman, Pan Stanford Publishing. (2008) (invited). Link
C.-H. Choi, C.-J. Kim. Novel method simplifies large-scale nanofabrication process, (2006). Nanowerk
C.-H. Choi, C.-J. Kim. Weniger Reibung durch spitze Nadeln, (2006). Deutschlandfunk: German National Public Radio
C.-H. Choi, C.-J. Kim. A Superhydrophobic Surface, (2006). Physics News Update: The AIP Bulletin of Physics News
C.-H. Choi, C.-J. Kim. Researchers Discover No-slip Condition Does Not Hold at the Nanoscale, (2006). UCLA Engineer
K. J. A. Westin, C.-H. Choi, K. S. Breuer. Rheological Shear Experiments in Micron Scale Geometries, Proceedings of the 5th International Conference on Micro Total Analysis Systems (MicroTAS2001). October 2001, Monterey, CA, USA
K. J. A. Westin, C.-H. Choi, P. Huang, Z. Cao, K. S. Breuer, B. Caswell, P. Richardson, M. Sibulkin. Liquid Transport Properties in Submicron Channel Flows, Proceedings of ASME IMECE. November 2001, New York, NY, USA
C.-H. Choi, K. J. A. Westin, K. S. Breuer. To Slip or Not to Slip: Water Flows in Hydrophilic and Hydrophobic Microchannels, Proceedings of ASME IMECE. November 2002, New Orleans, LA, USA
C.-H. Choi, J. Kim, C.-J. Kim. NanoTurf Surfaces for Reduction of Liquid Flow Drag in Microchannels, Proceedings of NANO2004 Integrated Nanosystems: Design, Synthesis and Applications. September 22-24, 2004, Pasadena, CA, USA
C.-J. Kim, C.-H. Choi. Nano-engineered Low Friction Surface for Liquid Flow, Proceedings of the 6th KSME-JSME Thermal and Fluids Engineering Conference. March 20-23, 2005, Jeju, Korea
C.-H. Choi, C.-J. Kim. Fabrication of Silicon Nanostructures with Various Side Wall Profiles and Sharp Tips, Proceedings of Transducers’05: The 13th International Conference on Solid-State Sensors, Actuators and Microsystems. June 5-9, 2005, Seoul, Korea
C.-H. Choi, C.-J. Kim. Control of Sidewall Profile of Silicon Nanostructures in Bosch Process and Its Use for Sharp Tip Fabrication, Proceedings of UKC2005: The 2005 US-Korea Conference on Science, Technology, & Enterpreneurship. August 11-13, 2005, Irvine, CA, USA
C.-H. Choi, C.-J. Kim. Measurement of Liquid Slip on NanoTurf Surfaces, Proceedings of NANO2005 Integrated Nanosystems: Design, Synthesis and Applications
. September 14-16, 2005, University of California, Berkeley, CA, USA
C.-H. Choi, S. H. Hagvall, J. C. Y. Dunn, B. M. Wu, C.-J. Kim. Cell Adhesions on NanoTurf Surfaces, Proceedings of MEMS 2006: The 19th International Conference on Micro Electro Mechanical Systems
. January 22-26, 2006, Istanbul, Turkey
C.-H. Choi, C.-J. Kim. Droplet Evaporation in Nanostructured Superhydrophobic Surfaces, in Proceedings of the 12th International Conference on Miniaturized Systems for Chemistry and Life Sciences (MicroTAS 2008), October 12-16, 2008, San Diego, CA, USA
C. Lee, C.-H. Choi, C.-J. Kim. Effect of Geometric Parameters of Superhydrophobic Surface on Liquid Slip, in Proceedings of ASME IMECE, November 2-6, 2008, Boston, MA, USA
Y.-T. Tsai, W. Xu, E.-H. Yang, C.-H. Choi. Interfacial-Tension-Directed Self-Assembly of Nanowires on a Superhydrophobic Surface, in Proceedings of ASME IMECE, November 2-6, 2008, Boston, MA, USA
C.-H. Choi, C.-J. Kim. Nanostructured surfaces for anti-biofouling/anti-microbial applications, in Proceedings of the SPIE Defense, Security, and Sensing, April 13-17, 2009, Orlando, FL, USA
C.-H. Choi, C.-J. Kim. Cell Growth on Three-Dimensional Sharp-Tip Nanostructures of Hydrophilic and Hydrophobic Surfaces, in Proceedings of the 13th International Conference on Miniaturized Systems for Chemistry and Life Sciences (MicroTAS 2009), November 1-5, 2009, Jeju, Korea
W. Xu, C.-H. Choi. Evaporation Kinetics of Nanofluid Droplets on Superhydrophobic Surfaces, in Proceedings of the 13th International Conference on Miniaturized Systems for Chemistry and Life Sciences (MicroTAS 2009), November 1-5, 2009, Jeju, Korea
R. Leeladhar, W. Xu, Y.-T. Tsai, E.-H. Yang, C.-H. Choi. Nanowire Self-Assembly in Droplet Evaporation on Superhydrophobic Surfaces, in Proceedings of the 13th International Conference on Miniaturized Systems for Chemistry and Life Sciences (MicroTAS 2009), November 1-5, 2009, Jeju, Korea
C.-H. Choi, S. H. Hagvall, B. M. Wu, J. C. Y. Dunn, R. E. Beygui, C.-J. Kim. The Year in Images, Biomaterials 2007
R. Leeladhar, W. Xu, C.-H. Choi. Effects of Nanofluids on Droplet Evaporation and Wetting on Nanoporous Superhydrophobic Surfaces, in Proceedings of ASME MNHMT, December 18-22, 2009, Shanghai, China
W. Xu, C.-H. Choi. Effects of Structural Topography on Nanofluids Droplet Evaporation on Multifarious Superhydrophobic Surfaces, in Proceedings of ASME MNHMT, December 18-22, 2009, Shanghai, China
I. Wathuthanthri, C.-H. Choi. Tunable Lloyd-Mirror Interferometer for Large-Area Nanopatterning, in Proceedings of ASME IMECE, November 15-19, 2009, Orlando, FL, USA
R. Leeladhar, W. Xu, C.-H. Choi. Evaporation of Nanoparticles Droplets on Nano-Porous Superhydrophobic Surfaces, in Proceedings of ASME IMECE, November 15-19, 2009, Orlando, FL, USA
W. Xu, C.-H. Choi. Nanofluids Evaporation Kinetics on Microstructured Superhydrophobic Surfaces, in Proceedings of ASME IMECE, November 15-19, 2009, Orlando, FL, USA
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