Berlin 2018 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 20: Poster Session I

CPP 20.19: Poster

Monday, March 12, 2018, 17:30–19:30, Poster A

A wide range of surface forces of PSS terminated polyelectrolyte multilayers — •Heba Soker Mohamad, Sven Neuber, Annkatrin Sill, and Chistiane A. Helm — Institut für Physik, Uni. Greifswald, Felix-Hausdorff-Str. 6 17489 Greifswald

Films built from the Poly (styrenesulfonate) (PSS) and poly (diallylmethylammonium) (PDADMA) in 0.1 Mol/L NaCl are investigated. Film build-up starts with a parabolic growth regime, followed by a linear growth regime. In the former positive PDADMA and negative PSS monomers are balanced; in the latter an excess of PDADMA monomers is balanced by Cl- ions. Colloidal probe measurements show that in the former PSS-terminated films are flat and negative, in the latter they are electrically neutral at 0.1 Mol/L NaCl and are positively charged at other ion concentrations . If exceeds 1 Mol/L steric forces are found. Thus, by choosing the growth regime and suitable post-preparation treatment the surface forces can be tuned.