Dec 7 – 8, 2021 Online only
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Influence of Hofmeister Salts on the Swelling Behavior of PNIPMAM Thin Films

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Dec 8, 2021, 10:30 AM
1h 30m
Board: P-58
Poster Soft Matter Poster Session II


Julija Reitenbach


Thermoresponsive polymer thin films have gained a lot of attention in the past decades due to their attractiveness for a wide range of applications. A variety of polymer showing LCST- or UCST-type behavior are known, and their transition temperatures can be influenced by various factors such as molar mass, end groups, copolymerization, or by the addition of salts. For polymers in aqueous solution, it was found that the folding of the polymer chains can be strongly influenced by the type of salt and this ability follows a trend called the Hofmeister series. While this effect is well known in solution, the influence on the swelling behavior of PNIPMAM thin films has yet to be investigated thoroughly. We aim to elucidate the underlying mechanism by spectral reflectance and time-of-flight neutron reflectometry on a macroscopic scale and by in situ Fourier-transform infrared spectroscopy on a molecular level.

Primary authors

Robert Cubitt Christina Geiger (Technical University of Munich, Chair of Functional Materials) Viet Hildebrandt Lucas P. Kreuzer (TUM Physik E13) Prof. André Laschewsky Peter Müller-Buschbaum (1 Technische Universität München, Fakultät für Physik, Lehrstuhl für Funktionelle Materialien, James-Franck-Str.1, 85748 Garching, Germany 2 Heinz Maier-Leibnitz-Zentrum (MLZ), Technische Universität München, Lichtenbergstr. 1, 85748 Garching, Germany) Christine Papadakis (Technische Universität München, Physik-Department, Fachgebiet Physik weicher Materie) Julija Reitenbach Peixi Wang (Workgroup Polymer Interfaces, TUM Department of Physics, Technical University of Munich)

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