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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 51: Poster Session III-2
CPP 51.10: Poster
Dienstag, 17. März 2020, 14:00–16:00, P2/EG
PNIPAM microgels at the air-water interface - Influence of cross-linking concentration and distribution — •Franziska Jakob, Matthias Kühnhammer, and Regine von Klitzing — Technical University of Darmstadt, Department of Physics, Soft Matter at Interfaces, 64287 Darmstadt, Germany
Poly-N-isopropylacrylamide (PNIPAM) is a deformable and temperature-responsive polymer microgel, which can adsorb at liquid interfaces. It has been in the focus of multitudinous studies in the past years and is still being discussed very actively in the context of various possible applications, because of their ability to respond to external stimuli like temperature.
Spreading of microgels at the air-water interface depends considerably on various parameters. One important factor is the cross-linking density that has a strong influence on the microgel film formed at the air-water interface, and thus a significant impact on the compression isotherm1.
In this contribution, films prepared from microgels with different cross-linking concentrations and different cross-linking distributions are studied. From this, conclusions regarding the degree of interdigitation (transition from core-core to shell-shell contact) of different microgels are drawn.
[1] C. Picard et al. Organization of Microgels at the Air-Water Interface under Compression: Role of Electrostatics and Cross-Linking Density. Langmuir 2017, p.7973 f.