Regensburg 2019 – wissenschaftliches Programm
CPP 25.52: Poster
Dienstag, 2. April 2019, 14:00–16:00, Poster B1
Buckling patterns and their elastic response on the surface of polyelectrolyte multilayer films with short PSS chains — •Amir Azinfar1, Sven Neuber1, Jiří Vaněček2, Marie Vancová2,3, Jan Sterba2,3, Vítězslav Straňák3, and Christiane A. Helm1 — 1Institute of Physics, University of Greifswald, 17489 Greifswald, Germany — 2Biology Centre, Czech Academy of Sciences, 37005 Ceske Budejovice, Czech Republic — 3Faculty of Science, University of South Bohemia, B 37005 Ceske Budejovice, Czech Republic
We investigate the surface morphology of polyelectrolyte multilayers (PEMs) after drying. A buckling pattern is observed. PEMs are made from poly(diallyldimethylammonium (PDADMA) and poly(styrene sulfonate) (PSS) in 0.1 M NaCl with non-linear and linear growth regimes. When more PSS/PDADMA layer pairs are deposited, for PSS-terminated films the wavelength of the buckling pattern increased from 185 nm to 225 nm. For PDADMA-terminated films the wavelength was always greater. The buckling pattern is correlated with the elastic modulus of the film, which decreased with increasing film thickness. Annealing in high salt concentrations (0.5 -1.0 mol/l NaCl) decreased the surface roughness and increased the wavelength of the buckling pattern. However, for films containing mobile PSS, annealing caused a damped oscillation of the buckling pattern.