题目：Particle and fluid manipulations in microfluidic devices
Dr. Xuan is currently an Associate Professor of Mechanical Engineering at Clemson University. He received his PhD degree from the Department of Mechanical and Industrial Engineering at University of Toronto in 2006 and Bachelor of Engineering degree from University of Science and Technology of China in 1995. Dr. Xuan was a recipient of NSF CAREER award in 2012. His research interests cover the fundamentals and applications of microfluidics with special interest in field-induced particle manipulations. He has published over 100 SCI journal articles with an H-index of 36.
Precise and effective manipulation (e.g., focusing, enrichment and sorting) of particles (both biological and synthetic) is critical in many chemical, biomedical and environmental applications. This can be achieved in microfluidic devices by an externally imposed force field, ranging from the ubiquitous gravity to electric, acoustic, optic and magnetic forces etc. Among this type of active approaches, the electric field-driven particle manipulation relies on electrokinetic phenomena and dielectrophoresis, where the former pumps the particle suspension via fluid electroosmosis and particle electrophoresis while the latter directs particles along or against electric field gradients. The magnetic field-driven particle manipulation is based on magnetophoresis that deflects particles either along or against magnetic field gradients. Microfluidic particle manipulation can also be implemented by the use of an inherent force field such as the flow and wall induced passive lift force. In this talk I will present the fundamental and applied studies completed and on-going in my group on electric field, magnetic field, and lift force-based particle manipulations in microfluidic devices. I will also talk about our recent research on nonlinear electrokinetic fluid flows in insulator-based dielectrophoretic microdevices.