Berlin 2018 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 20: Poster Session I
CPP 20.45: Poster
Montag, 12. März 2018, 17:30–19:30, Poster A
Roughness and Salt Annealing in a Polyelectrolyte Multilayer — •Amir Azinfar1, Sven Neuber1, Jiri Vanecek2, Maria Vancova2, Viteslav Stranak2, and Christiane A. Helm1 — 1Inst. f. Physics, Greifswald University, Germany — 2Fac. of Science, University of South Bohemia, Ceske Budejovice, Czech Republic
The surface roughness of polyelectrolyte multilayers made from poly(diallyldimethylammonium chloride) (PDADMA) and poly(styrene sulfonate) (PSS,10.6 kDa) increases with the number of deposition steps until the linear growth regime is reached; then it is constant. AFM and Electron microscopy show the formation of micrometer-sizes features. The wavelength of the roughness features is approximately proportional to film thickness, which supports a mechanism whereby roughness is generated by anisotropic shrinking due to dehydration. Due to the viscous response of polyelectrolyte complexes the surface features are possibly better described as *damped* creases, where a small amount of flow is allowed in the most stressed regions. Annealing in high salt decreases in the long term the roughness.