Dresden 2011 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 38: Poster: Colloids and Complex Liquids
CPP 38.16: Poster
Wednesday, March 16, 2011, 17:00–19:00, P2
Bicontinuous microemulsions at solid surfaces — •Stefan Wellert1, Ralf Stehle2, Christoph Schulreich3, Roland Steitz2, and Thomas Hellweg3 — 1Stranski-Laboratorium für Physikalische und Theoretische Chemie, Inst. f. Chemie TU Berlin, Strasse des 17. Juni 124, D-10623 Berlin — 2Helmholtz Zentrum Berlin, Hahn-Meitner Platz 1, D-14109 Berlin — 3Universität Bielefeld, Physikalische und Biophysikalische Chemie (PC III) Universitätsstr. 25, D-33615 Bielefeld
The commercial availability of a large variety of bioinspired surfactants results in a renewed interest in microemulsions being thermodynamically stable self-assembled structures of oil, water and amphiphiles.
Solid surfaces play an essential role in many desired applications. The involved real surfaces can be of variable hydrophobicity due to external influences (e.g. weathering) leading to continuously modified physico-chemical properties of these surfaces. Especially bicontinuous microemulsions are of great interest and the physico-chemical properties of these structure in the bulk phase were studied in many surfactant systems but much less is known about the behaviour or changes of this structure in the presence of a solid surface.
Neutron reflectometry is well suited to resolve the structure of the interface between the microemulsion and the solid surface and we report on measurements on bicontinuous structures on hydrophilic and hydrophobic surfaces. Additionally, we discuss the wetting properties in terms of contact angles at different oil-water ratios at hydrophilic, -phobic and partially hydrophobic surfaces.