A new experimental approach to the study of electro-kinetics
报告题目：A new experimental approach to the study of electro-kinetics
The competition between charge-charge interaction and the thermal motion of ions and small particles sets the conditions of stability of charged particles in solution, their aggregation in some situations, as well as their mobility under an external electric field. The conventional measurement of electrophoretic mobility is typically reported as the zeta potential around the charged particles. However, the zeta potential itself is defined based on mean field, electrostatic theories. The measurement of zeta potential is often problematic, as it does not take into consideration of complicating factors such as electro-osmotic flow, counterion condensation effect, and scattering intensities dependent on the particle shape and orientation, etc. In this seminar, I describe using a direct imaging method to measure electrophoretic mobility of charged protein filaments, filamentous viruses, and live bacteria. By considering complications due to electro-osmotic flow and self-propulsion, for the case of swimming bacteria, we seek to better define the motions of charged particles in electric field, and explore for potential applications of such studies.
Vitae of Jay X. Tang（唐建新）
Name, Position and Academic Department(s)
Jay X. Tang, Professor of Physics and Engineering
Ø Postdoctoral Research Fellow supported by a National Institute of Health (NIH) training grant, Harvard Medical School, July, 1994-September, 1997
Ø Instructor of Medicine, Harvard Medical School, October, 1997-August, 1999
Ø Assistant Professor of Physics, Indiana University, August, 1999-December, 2002
Ø Guest Faculty at the Institute of Theoretical Physics (ITP), University of California-Santa Barbara,Program Title: Complex Fluids, Feb-March, 2002
Ø Assistant Professor of Physics and Engineering, Brown University, July, 2002- June, 2008
Ø Guest Professor, Institute of Physics, Chinese Academy of Sciences, 2005-2008
Ø Associate Professor of Physics and Engineering, Brown University, July, 2008- 2015
Ø Professor of Physics and Engineering, Brown University, July, 2015-present
Ø Faculty Trainer, Biomedical Engineering (BME) and Molecular Pharmacology and Physiology (MPP)
Ø graduate programs, 2010-present.
Academic Honors and Fellowships
• China and the U. S. Physics Examination and Application (CUSPEA), a joint program designed to select top Chinese physics students for graduate study in the US, July, 1987.
• Martin Fisher Scholar of Physics, Brandeis University, Sept., 1988 - May, 1991.
• Stephen Berko Memorial Prize for Outstanding Research, Brandeis University, May, 1994.
• Departmental Nomination for Sloan Fellowship, Sept, 2000.
• Joseph and Sophia Konopinski Award for Teaching Excellence, April, 2002, Indiana University.
• Salomon Research Award, Brown University, 2004.
• Kuanchen Wang Travel Award to visit Institute of Genetic Engineering, Beijing, China, Dec, 2006; Aug,
• Salomon Teaching Award, Brown University, 2008.
• Santander Universities Travel Award for International Collaboration, 2011.
• Elected American Physical Society Fellow (Biological Physics), 2016