Regensburg 2022 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 17: Poster 2

CPP 17.20: Poster

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

Interaction of soft microgel with solid silica particles at the air-water interface — •Carina Schneider, Sebastian Stock, Kevin Gräff, Franziska Jakob, and Regine von Klitzing — Departement of Physics, TU Darmstadt, Hochschulstraße 8, 64289, Darmstadt

Emulsions stabilized by multiple particle systems are interesting in various research fields, e. g., in the food industry or interfacial catalysis. The interaction of two or more nano-particle systems of different properties at liquid interfaces is important for the coalescence behavior of emulsion droplets stabilized by these particle mixtures. For instance, a mixture of hydrophilic microgel particles (MGs) and hydrophobic silica nano-particles (SiNP) is able to stabilize water in oil emulsions, which is not possible with MGs alone. Therefore, it is of special interest to understand the interaction of those particles at the interface. In this context, their lateral compression may simulate the droplet interfaces under coalescence conditions. For this purpose, we spread mixtures of poly-NIPAM MGs and spherical SiNPs at the air-water interface of a Langmuir trough and determined the compression isotherms. For deeper insights into the lateral structure formation, the particle layers were transferred onto Silicon wafers and scanned by atomic force microscopy. For low compressions, the elastic MG network dominates the isotherm while SiNP are situated between the MGs with low impact. For higher compressions, the inelastic SiNP structures are pushed onto the MGs and take over the resistance to the outer pressure.