Regensburg 2010 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 21: Soft Matter II

DY 21.4: Talk

Wednesday, March 24, 2010, 17:15–17:30, H47

Heterodyne electrophoretic light scattering of a interacting colloidal system — •Martin Medebach — Stranski Laboratory, Technische Univeristät Berlin, Strasse des 17.Juni 124, 10623 Berlin

A heterodyne light scattering technique is used to measure the electrophoretic flow behavior of a concentrated, deionized colloidal suspension. It was found that the measured power spectra show an increase of the frequency-integrated intensity with the electric field. Because the number of particles should remain constant this finding is unusual. Further on, the width of the spectra depends linearly on the electric field. Although the system is interacting an influence of the structure factor on the spectra is apparently missing. A model that explains the intensity effect and the missing structural influence on the spectra will be discussed in detail.