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Suk Tai Chang, Ph.D.

Biosystems Research and Development

Research Summary

The focus of my graduate research projects was the manipulation of particles and fluids on the microscale using evaporation-induced, dielectrophoretic, or electrokinetic forces. I demonstrated remotely powered self-propelling diode particles and their application for novel micro-pumps and mixers locally distributed in microfluidic chips. As a new droplet engineering technology, I explored vertical particle microseparations inside an evaporating droplet freely floating on a dielectrophoretic liquid chip, which found the application for innovative microbioassays. Also, I developed polyelectrolyte diodes based on aqueous agarose gel phases, which is an alternative way toward flexible and biocompatible electronic circuits.

I am currently working on the development of microfluidic technology to analyze lignin components in ionic liquids for biofuel research. In addition, I am pursuing the characterization of electrokinetic properties of ionic liquids for electrophoresis application.

Recent Publications

Suk Tai Chang, Ahmet Burak Ucar, Garrett R. Swindlehurst, Robert O. Bradley IV, Frederick J. Renk and Orlin D. Velev, Materials of controlled shape and stiffness with photocurable microfluidic endoskeleton, Advanced Materials (2009) in print.

Suk Tai Chang, Erin Beaumont, Dimiter N. Petsev and Orlin D. Velev, Remotely powered distributed microfluidic pumps and mixers based on miniature diodes, Lab on a Chip (2008) 8, 117-124.

Olivier J. Cayre, Suk Tai Chang and Orlin D. Velev, Polyelectrolyte Diode: Nonlinear Current Response of a Junction between Aqueous Ionic Gels, Journal of the American Chemical Society (2007) 129, 10801-10806.

Suk Tai Chang, Vesselin N. Paunov, Dimiter N. Petsev and Orlin D. Velev, Remotely Powered Self-Propelling Particles and Micropumps Based on Miniature Diodes, Nature Materials (2007) 6, 235-240.

Hye Young Koo, Suk Tai Chang, Won San Choi, Jeong Ho Park, Dong Yu Kim and Orlin D. Velev, Emulsion-Based Synthesis of Reversibly Swellable, Magnetic Nanoparticle-Embedded Polymer Microcapsules, Chemistry of Materials (2006) 18, 3308-3313.

Suk Tai Chang and Orlin D. Velev, Evaporation-Induced Particle Microseparations inside Droplets Floating on a Chip, Langmuir (2006) 22, 1459-1468.

Suk Tai Chang, Hyun Joo Lee and Man Bock Gu, Enhancement in the sensitivity of a soil biosensor for the detection of PAH toxicity using an immobilized recombinant bacterium and a biosurfactant, Sensors and Actuators B: Chemical (2004) 97, 272-276.

Man Bock Gu and Suk Tai Chang, Soil Biosensor for the Detection of PAH Toxicity Using an Immobilized Recombinant Bacterium and a Biosurfactant, Biosensors & Bioelectronics (2001) 16, 667-674.

Geun Cheol Gil, Robert J. Mitchell, Suk Tai Chang and Man Bock Gu, A biosensor for the detection of gas toxicity using a recombinant bioluminescent bacterium, Biosensors & Bioelectronics (2000) 15, 23-30.


2008 – present: Postdoctoral Fellow, Sandia National Laboratories, Livermore, CA


2003 – 2008: Ph.D. in Chemical Engineering, North Carolina State University, Raleigh, NC, (Advisor: Prof. Orlin D. Velev)

1999 – 2001: M.S. in Environmental Science and Engineering, Gwangju Institute of Science and Technology, Korea, (Advisor: Prof. Man Bock Gu)

1992 - 1999: B.S. in Chemical Engineering, Chung-Ang University, Korea

Contact Information

Dr. Suk Tai Chang
Biosystems Research Department
Sandia National Laboratories
MS 9292, PO Box 969
7011 East Avenue
Livermore, CA 94551-0969
Phone: 925-294-3895
Fax: 925-294-3020