Dresden 2006 – scientific programme
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CPP: Chemische Physik und Polymerphysik
CPP 13: POSTER New Experimental Techniques
CPP 13.11: Poster
Tuesday, March 28, 2006, 17:00–19:00, P3
Spectroscopic Ellipsometric Light Scattering: a Tool for the Detection of Anisotropic Layers on the Interface of Colloidal Particles — •Arne Stark1, Andreas Erbe2 und Reinhard Sigel1 — 1Max-Planck-Institut of Colloids and Interfaces, D-14476 Golm — 2University of Leeds, Leeds, UK
The sensitivity of ellipsometric light scattering (ELS) to anisotropy is demonstrated by model calculations and experiments on lipid vesicles. ELS is the combination of light scattering with the polarization optics and nulling scheme of an ellipsometer. Similar to reflection ellipsometry it is sensitive on interface layers, however not on flat interfaces but at the interface of colloidal particles to the surrounding solvent. The presented model calculations based on Mie theory indicate a change of the information content with varying wavelength. In addition, a strong effect of the layer anisotropy on the signal is found. Experiments on lipid vesicles confirm the significant effect of anisotropy. We were able to determine the optical anisotropy of these vesicles. From this, it is possible to estimate the average tilt angle of the lipid chain in the vesicle.