Talk: Responsive polymer colloids as model atoms with tunable interactions

Prof. Dr. Peter Schurtenberger

Adolphe Merkle Institute, University of Fribourg, Switzerland

Monday, November 9, 2009, at 11:00 a.m.

Hermann Staudinger Lecture Hall, 1.520, MPI-P (Mainz)

Thermosresponsive charged microgel particles serve as ideal model systems in order to investigate the influence of charges, ionic strength, volume fraction and particle softness on the phase behavior and the associated structural and dynamic properties. I shall present a study of the phase behaviour of PNIPAM (N-isopropylacrylamide) micro-gel particles by static and dynamic light scattering, Diffusing wave spectroscopy (DWS) and confocal laser scanning microscopy (CLSM). The combination of DWS and CLSM not only provides us with dynamic information over a very large range of time scales, it also gives access to detailed and spatially resolved structural data such as the correlation functions through multiple particle tracking in different regions of the phase diagram.

Host: Kurt Kremer