Dresden 2017 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 68: Hydrogels and Microgels II
CPP 68.3: Vortrag
Freitag, 24. März 2017, 10:45–11:00, ZEU 260
Structure and rheology of microgel monolayers at the water/oil interface — •Shilin Huang1, Kornelia Gawlitza2, Regine von Klitzing2, Werner Steffen1, and Günter K. Auernhammer1 — 1Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany — 2Stranski-Laboratorium für Physikalische und Theoretische Chemie, Technische Universität, Berlin, Strasse des 17. Juni 124, 10623 Berlin, Germany
We investigate the rheological property of microgel monolayers at the water/oil interface using passive and active microrheological methods. At low surface coverage, the microgels at the water/oil interface have a tendency to form aggregated structures (networks) with dominating elasticity. At high surface coverage the microgels form densely packed monolayers. Using microsized magnetic particles as the local rheological probes in the dense microgel monolayers, we perform in situ study of their rheolocial properties and structures. We observe four regimes where the elasticity of the microgel monolayer has different dependence on the microgel concentration at the interface. The rheological properties of the microgel monolayers are not only dependent on the concentration, but also strongly correlated with the inter-microgel distance and spacial arrangement of the microgels at the interface. Our results also show that the microgel monolayers act similar to soft glassy materials.