Regensburg 2016 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 82: Structure of Solid/Liquid Interfaces I
O 82.3: Vortrag
Donnerstag, 10. März 2016, 11:00–11:15, H6
Model free method to measure the surface potential of colloidal particles in aqueous solution — •Grazia Gonella1, Cornelis Lütgebaucks2, and Sylvie Roke2 — 1Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany — 2Laboratory for fundamental BioPhotonics (LBP), Institute of Bioengineering (IBI), and Institute of Materials Science (IMX), School of Engineering (STI), and Lausanne Centre for Ultrafast Science (LACUS), École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
Retrieval of information regarding properties of, and processes at, interfaces is notoriously difficult especially at the surface of colloidal particles in solution. Determination of the surface potential, Φ0, is a particularly important albeit difficult task. For instance Φ0 affects the stability of a colloidal suspension and in turn is affected by the opening of ion-channels in a membrane, just to cite two core problems in colloids and soft matter. Computations have shown that in theory the SH scattering pattern contains enough information to determine Φ0 without making any assumptions on the structure or state of the interface. We implement this theory and extend it to low ionic strengths and use it to determine the surface potential of a variety of colloidal systems in aqueous solution.