报告题目：

Diamagnetic particle manipulation in ferrofluid-based

microfluidic devices

报告人:                   Prof. Xiangchun Xuan

Department of Mechanical Engineering, Clemson University, Clemson, SC 29634, USA

时间：2014年6月19日(周四)   9:30

地点：中科院力学所主楼334会议室

报告摘要：

Precise control of particle motion is required in many chemical and biomedical applications. A variety of force fields have been demonstrated to implement particle manipulation in microfluidic devices, ranging from the ubiquitous gravity to electric, hydrodynamic, acoustic, optic and magnetic forces. Magnetic particle control is based on magnetophoresis which deflects particles either along (i.e., positive magnetophoresis) or against (i.e., negative magnetophoresis) a magnetic field gradient. Positive magnetophoresis takes place for magnetic particles suspended in nonmagnetic fluids, and has so far been the primary form of magnetic field-driven particle manipulations in microfluidics. In contrast, diamagnetic (or simply speaking, nonmagnetic) particles experience negative magnetophoresis in magnetic fluids (e.g., paramagnetic solution and ferrofluid), and can be non-invasively controlled without being magnetically labeled. However, the applications of negative magnetophoresis in microfluidic devices are still very limited and the fundamental transport phenomena behind it still remain unsystematically explored. In this talk I will present our recent results on both the fundamental and applied studies of diamagnetic particle manipulations, which include particle focusing, enrichment and sorting, in ferrofluid-based microfluidic devices.

报告人简介：

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. He also had a Doctor of Engineering degree on Physical Electronics from Shanghai Institute of Technical Physics in 2000. Dr. Xuan was a recipient of NSF CAREER award in 2012. His research interests cover micro/nanofluidics fundamentals and lab-on-a-chip applications. He has published over 80 articles in leading international journals with an SCI h-index of 26.