Dresden 2009 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 16: POSTERS Polyelectrolytes and Biological Systems

CPP 16.20: Poster

Tuesday, March 24, 2009, 14:00–16:30, P3

Structuring of Polyelectrolye Solutions Under Confinement of Solid-Solid and Air-Air Interfaces — •Cagri Üzüm¹, Jérome Delacotte², Dominique Langevin², and Regine v. Klitzing¹ — ¹Stranski-Laboratorium für Physikalische und Theoretische Chemie - Institut für Chemie TU Berlin, Sekr. TC 9 Strasse des 17. Juni 124 D-10623 Berlin, Germany — ²Laboratoire de Physique des Solides, UMR 8502 Université Paris-Sud, Bât. 510 91405 Orsay cedex, France

The presented work focuses on the structuring of polyelectrolyte solutions(PAMPS) which are confined either between two fluid interfaces in a free-standing foam film or between two solid interfaces. The forces between the opposing interfaces depend on the composition of the film interfaces and charasteristics(e.g. type of charged and neutral groups, charge fraction, concentration) of the film fluid [1]. The confinement leads to oscillatory forces in a Colloidal Probe AFM and to a stepwise thinning in foam films. The oscillatory pressure curves are then compared to small angle scattering(SANS or SAXS, which give information about bulk structuring) spectra. Solutions of linear polyelectrolytes show a structure peak scaling with the polyelectrolyte concentration c as q[max] ∼ c^1/2. The scaling law is predicted by theoretical models [2, 3]. The effect of the molecular architecture, e.g. linear, comb-like and branched polyelectrolytes on the structuring will be shown. [1] R. v. Klitzing. Adv. Coll. Interf. Sci. 2005, 114/115, 253. [2] R. v. Klitzing, B. Kolaric, W. Jaeger, A. Brandt. Phys. Chem. Chem. Phys. 2002, 4, 1907. [3] D. Qu, J.S. Pedersen, S. Garnier, A. Laschewsky, H. Möhwald, R. v. Klitzing. Macromolecules. 2006, 39, 7364.