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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 17: Poster 2

CPP 17.21: Poster

Dienstag, 6. September 2022, 11:00–13:00, P2

Adsorption kineticts of microgel particles at the air/water interface — •Kai Luca Spanheimer, Daniel Jäger, Sebastian Stock, and Regine von Klitzing — Department of Physics, TU Darmstadt, Hochschulstraße 8, 64289 Darmstadt

Interest in microgel particles (MGs) based on poly-N-isopropyl acrylamide (PNIPAM) as surface-active material remains high. The nano- to micrometer sized, cross-linked polymer particles are able to adsorb to water/air or water/oil interfaces spontaneously. Combined with their ability to act as carriers for drugs, recent studies showed, that they may act as transport vehicles for amphiphilic catalysts to the interface, resulting in improved interfacial catalysis, e. g., in Pickering emulsions. Despite much research on the interaction of MGs with various low and higher molecular weight material, the adsorption of MG/catalyst complexes at the interface is not yet well understood. In the presented work, the adsorption kinetics at the air/water interface is measured via change in surface tension over time by drop shape analysis. In order to disentangle different effects in case of MG/catalyst complexes the adsorption kinetics of pure MGs and mixtures of MGs with simple anionic and cationic surfactants as model systems for the catalysts is studied and compared with the adsorption of MG/catalysts complexes.