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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 18: Interfaces and Thin Films II

CPP 18.6: Vortrag

Dienstag, 23. März 2010, 15:15–15:30, H39

Polyelectrolyte Solutions Confined between Two Solid Surfaces — •Cagri Üzüm and Regine v. Klitzing — Stranski-Laboratorium für Physikalische und Theoretische Chemie - Institut für Chemie TU Berlin, Sekr. TC 9 Strasse des 17. Juni 124 D-10623 Berlin

Thin liquid films play an important role in macroscopic colloidal systems. Stability of a colloidal suspension -in which particles are dispersed in a liquid- is mainly dominated by the stability of the thin films seperating the dispersed particles.

In this contribution, liquid thin films of polyelectrolyte (PSS and PAMPS derivatives) solutions confined between two solid surfaces are studied. Colloidal Probe AFM is used to study the structure formation of aqueous polyelectrolyte solutions under geometrical confinement.

It was observed that AFM force measurements on the polyelectrolyte solutions lead to oscillatory force curves in a certain concentration range. These oscillatory curves can be used to study the interactions between the polyelectrolyte chains, which were described also by theoritical models. Concentration, type of the monomers and charge fraction of the polyelectrolyte chains determine the structuring [1]. In addition to those, effect of surfactant in the system, molecular weight and architecture of the polyelectrolyte chains on the structuring were investigated. Viscosity and conductivity measurements were taken for a better understanding of the phenomena.

[1] D. Qu, J.S. Pedersen, S. Garnier, A. Laschewsky, H. Möhwald and R. v. Klitzing. Macromolecules 39, 7364 (2006).