Dr. Chang-Hwan Choi

Assistant Professor

Faculty/Professor
Building: Carnegie
Room: 204
Phone: 201.216.5579
Fax: 201.216.8315
Email: cchoi@stevens.edu
Personal website: http://www.stevens.edu/nmfl/

Appointments Thesis Supervisor

  • Assistant Professor, Department of Mechanical Engineering, Stevens Institute of Technology, January 2007 - present
  • Researcher, Satellite Division, Korea Aerospace Research Institute (Korea), December 1999 - June 2000
  • Lecturer, Foreign Language Department, Chandrakasem Rajabhat University (Thailand), March 1997 - November 1999
  • Assistant Researcher, Satellite Division, Korea Aerospace Research Institute (Korea), February 1996 - December 1996

Education

  • Ph.D., Department of Mechanical and Aerospace Engineering (Concentration in MEMS/Nanotechnology), University of California at Los Angeles (UCLA), 2006
  • M.S., Division of Engineering (Concentration in Fluids, Thermal, and Chemical Processes), Brown University, 2002
  • M.S., Department of Aerospace Engineering, Seoul National University (Korea), 1997
  • B.S. (Magna cum Laude, with Honors), Department of Aerospace Engineering, Seoul National University (Korea), 1995

Research: 

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.

Professional Activities/Services

  • Reviewer (Journal): Applied Materials & Interface, Applied Surface Science, Biomaterials, IEEE Spectrum, Journal of Fluids Engineering, Journal of Microelectromechanical Systems, Journal of Micromechanics and Microengineering, Lab on a Chip, Langmuir, Microfluidics and Nanofluidics,  Nanotechnology, Philosophical Transactions, Physical Review E, Physical Review Letters, Physics of Fluids 
  •  Reviewer (Conference Proceedings): ASME ICNMM, ASME IMECE, European Conference on Microfluidics
  •  Reviewer (Grant Proposal): the City University of New York Internal Research Award Program, US National Science Foundation, Swiss National Science Foudation

Research Projects Interests

  • Large-area 3-D nanopatterning and nanostructure fabrication
  • Multifunctional superhydrophobic nanostructured materials
  • Multiscale fluid physics and heat transfer on nanostructured surface
  • Microfluidic self-assembly of nanomaterials
  • Nanofluidic energy harvesting
  • Optofluidic waveguide and sensor

Awards and Honors

  • NSF Fellowship, National Science Foundation (Summer Institute on Nano Mechanics and Materials), 2007 
  • KUSCO/KSEA Scholarship, Korea-U.S. Science Cooperation Center/Korean-American Scientists and Engineers Association, 2006
  • Graduate Fellowship, California NanoSystems Institute, 2002
  • Engineering Research Fellowship, Brown University, 2000
  • National Fellowship, Korean Government, 2000
  • 'Magna cum laude' Honors, Seoul National University, 1995

Publications

  1. 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, p. 4665-4675.

  2. C. Lee, C.-H. Choi, C.-J. Kim (Dec 2008) "Structured Surfaces for a Giant Liquid Slip".

  3. R. Leeladhar, W. Xu, C.-H. Choi "Evaporation of Nanoparticles Droplets on Nano-Porous Superhydrophobic Surfaces".

  4. C.-H. Choi, K. J. A. Westin, K. S. Breuer "Apparent Slip Flows in Hydrophilic and Hydrophobic Microchannels".

  5. 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.

  6. W. Xu, C.-H. Choi "Nanofluids Evaporation Kinetics on Microstructured Superhydrophobic Surfaces".

  7. K. J. A. Westin, C.-H. Choi, K. S. Breuer "A Novel System for Measuring Liquid Flow Rates with Nanoliter per Minute Resolution".

  8. C.-H. Choi, S. H. Hagvall, B. M. Wu, J. C. Y. Dunn, R. E. Beygui, C.-J. Kim "The Year in Images".

  9. C.-H. Choi, C.-J. Kim "Nanostructures in Electronics and Photonics", Faiz Rahman, Pan Stanford Publishing.

  10. 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".

  11. 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".

  12. C.-H. Choi, C.-J. Kim "Novel method simplifies large-scale nanofabrication process".

  13. C.-H. Choi, C.-J. Kim "Droplet Evaporation of Pure Water and Protein Solution on Nanostructured Superhydrophobic Surfaces of Varying Heights".

  14. C.-H. Choi, C.-J. Kim "Weniger Reibung durch spitze Nadeln".

  15. C.-H. Choi, C.-J. Kim "Droplet Evaporation in Nanostructured Superhydrophobic Surfaces".

  16. C.-H. Choi, C.-J. Kim "A Superhydrophobic Surface".

  17. C. Lee, C.-H. Choi, C.-J. Kim "Effect of Geometric Parameters of Superhydrophobic Surface on Liquid Slip".

  18. C.-H. Choi, C.-J. Kim "Researchers Discover No-slip Condition Does Not Hold at the Nanoscale".

  19. Y.-T. Tsai, W. Xu, E.-H. Yang, C.-H. Choi "Interfacial-Tension-Directed Self-Assembly of Nanowires on a Superhydrophobic Surface".

  20. 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).

  21. C.-H. Choi, C.-J. Kim "Nanostructured surfaces for anti-biofouling/anti-microbial applications".

  22. 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.

  23. C.-H. Choi, C.-J. Kim "Cell Growth on Three-Dimensional Sharp-Tip Nanostructures of Hydrophilic and Hydrophobic Surfaces".

  24. W. Xu, C.-H. Choi "Evaporation Kinetics of Nanofluid Droplets on Superhydrophobic Surfaces".

  25. 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.

  26. R. Leeladhar, W. Xu, Y.-T. Tsai, E.-H. Yang, C.-H. Choi "Nanowire Self-Assembly in Droplet Evaporation on Superhydrophobic Surfaces".

  27. 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".

  28. 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.

  29. 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".

  30. 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.

  31. R. Leeladhar, W. Xu, C.-H. Choi "Effects of Nanofluids on Droplet Evaporation and Wetting on Nanoporous Superhydrophobic Surfaces".

  32. 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’)".

  33. 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.

  34. W. Xu, C.-H. Choi "Effects of Structural Topography on Nanofluids Droplet Evaporation on Multifarious Superhydrophobic Surfaces".

  35. C.-H. Choi, U. Ulmanella, J. Kim, C.-M. Ho, C.-J. Kim "Effective Slip and Friction Reduction in Nanograted Superhydrophobic Microchannels".

  36. 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.

  37. I. Wathuthanthri, C.-H. Choi "Tunable Lloyd-Mirror Interferometer for Large-Area Nanopatterning".

  38. C.-H. Choi, C.-J. Kim "Large Slip of Aqueous Liquid Flow over a Nanoengineered Superhydrophobic Surface".

  39. C.-H. Choi, C.-J. Kim "Measurement of Liquid Slip on NanoTurf Surfaces", Proceedings of NANO2005 Integrated Nanosystems: Design, Synthesis and Applications.

Professional Organizations and Societies

  • Member, American Society of Mechanical Engineers (ASME), 2005 - present
  • Member, Institute of Electrical and Electronic Engineers (IEEE), 2005 - present
  • Member, Korean-American Scientists and Engineers Association (KSEA), 2005 - present

Academic Activities/Services

  • Organizer: The 1st Stevens ME Dept. MEMS/NEMS Student Meeting (October 19, 2007)
  • Coordinator: Workshops on Biomaterials Sciences and Engineering (2007-2008)
  • Technical Program Committee: The 1st Metro Area MEMS/NEMS Workshop (July 23, 2007)
  • Session Chair: The 4th Annual DMI/ME Research Conference (May 16-17, 2007)