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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 50: Poster Session III
CPP 50.51: Poster
Dienstag, 17. März 2020, 14:00–16:00, P1C
Characterization of nano-particles with regard to hydrophobicity, size and emulsion-stabilizing capabilities — •Kai Luca Spanheimer1, Sebastian Stock1, Annika Schlander2, Marcus Gallei2, and Regine von Klitzing1 — 1TU Darmstadt, Condensed Matter Physics — 2TU Darmstadt, Makromolekulare Chemie
For particle stabilized foams and emulsions the hydrophobicity of the used particles is an important parameter. For instance in case of Pickering emulsions(PE) the main effect of the particle hydrophobicity is the emulsion type (oil in water or water in oil). In an attempt to find a procedure determining the hydrophobicity of colloidal particles different types of silica-spheres were modified to achieve specific surface properties. Using silanization differently charged and hydrophobic groups were bound the surface. Contact angle measurements via sessile-drop are used to determine the surface energy of water on the coated wafer, which is a measure for the hydrophobicity of the surface. In the wetting case the contact angle depends on the roughness of the surface. Therefore, atomic-force-microscopy studies of the particle-layer were performed to determine the roughness and to ensure the comparability. It could be shown that the resulting emulsion type for prepared Pickering emulsions corresponds to the prediction (Bancroft rule) based on the measured particle-hydrophobicity.