报告题目：Light scattering made difficult: polyelectrolytes in nonaqueous media and scattering from light absorbing solutions
报告人：Thomas A. P. Seery教授（University of Connecticut）
报告时间：2015年7月4日（周五）上午10：00
报告地点：独墅湖校区907号楼1445报告室
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报告内容：
Dynamics light scattering is a powerful tool for the in situ characterization of macromolecular species in solution. The time scale for data acquisition is rapid enough for kinetic work, sizes and size distributions can be obtained, and, when total intensities are acquired, molecular weights and virial coefficients can also be determined. However, in some systems, extraordinary behavior or anomalous scattering can occur and be difficult to interpret.
Polyelectrolytes in low salt exhibit scattering that points to dynamics that are not explained or predicted by theory. Work in our lab and elsewhere has demonstrated that these dynamic phenomena are present but masked at higher salt concentrations. Since polyelectrolytes are commonly in need of characterization it is important to understand what the results of a simple DLS measurement are telling us.
Light absorbing solutions show the effects of dissipating the heat resulting from absorption and this complicates the interpretation of the DLS relaxation function. Since absorption of light occurs with many systems of interest – conducting polymers, nanoparticles, proteins, carbon nanotubes – there is some value in developing an interpretation of these data that provides information on molecular sizes.
Thomas A. P. Seery教授简介：
Dr. Thomas A. P. Seery received his B.S. degree in Chemistry from Harvard University in 1985, and Ph.D. in Chemistry from University Of Southern California in 1991. After that, he is a postdoctoral associate at the University Of Southern California, 1992, and University Of California, Berkeley during 1993-1994. He joined the University of Connecticut as an assistant professor in 1994, and promoted to associate professor in 2000. He is the director of Polymer Program at University of Connecticut during 2005-2008. His research interests include nanocomposite syntheses, polymer solutions, hydrogels with hydrophobic associations, polyelectrolytes in nonaqueous solvents, and light scattering.
