Berlin 2018 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 51: Hydrogels and Microgels

CPP 51.2: Vortrag

Mittwoch, 14. März 2018, 15:15–15:30, C 264

Foams stabilized by PNIPAM microgels — •Matthias Kühnhammer and Regine von Klitzing — Technical University of Darmstadt, Department of Physics, Soft Matter at Interfaces, 64287 Darmstadt, Germany

Cross-linked, short-chained poly-N-isopropylacrylamide (NIPAM) polymers, also referred to as microgels, have attracted much attention during the last years and were studied with various techniques and in the context of multiple possible applications. Since these microgels are responsive to external stimuli like temperature, materials made from them can be considered 'smart' materials. A prominent example are thermo-responsive emulsions stabilized by microgel particles adsorbed at the water-oil interface. In these systems the emulsion stability can be controlled by changing the temperature [1,2].

In this contribution we report on our experiments with aqueous foams, which are stabilized by PNIPAM microgel particles. We present how microgel properties like size, cross-linking density and particle concentration can influence properties of macroscopic foams prepared with them. In addition we attempt to link the differences in foamability and foam stability to the properties of the different microgels in solution. [1] B. Brugger, B. Rosen, W. Richtering, Langmuir, (2008), p. 12202. [2] V. Schmitt, V. Ravaine, Curr. Opin.Colloid Interface Sci. (2013), p. 532.