Berlin 2018 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 33: Poster Session III

CPP 33.18: Poster

Dienstag, 13. März 2018, 14:00–16:00, Poster C

Modification of polymer particles with Rh-catalyst for stabilization of Pickering emulsions in catalysis — •Sandra Forg, Dmitrij Stehl, and Regine von Klitzing — Institut für Festkörperphysik, Technische Universität Darmstadt, Alarich-Weiss-Straße 10, D-64287 Darmstadt

Particle stabilized oil-in-water emulsions, so called Pickering emulsions, are useful for many applications, i.e. the liquid/liquid catalysis. To create such emulsions nanoparticles accumulate at the interface of the two liquids to prevent them to coalesce. The benefit of these emulsions is the increase of the surface area available for catalytic reactions, which enhances the efficiency of these reactions. Besides, the stabilized Pickering emulsions should make it easier to recover the catalyst.

Due to this reason, emulsions stabilized both with Poly(N-isopropylacrylamide) (PNIPAM) and with Polystyrene-NH2 (PS-NH2) will be used during this work. Both particles will have a positive charge and thus, the negatively charged Rh-catalyst will adsorb on them. By modification of the ratio between particles and catalyst, the hydrophobicity will be changed. Furthermore, PNIPAM has the benefit that it is temperature-responsive. Due to this temperature-dependence, the diameter of PNIPAM and its chemical affinity to water can be easily affected by changing the temperature. This will result in changes in the stability of the emulsion. A main goal of this work will also be the improvement of knowledge of Pickering emulsions with respect of different properties such as their stability, their structure or the immobilization of the catalyst on the particles.