Dresden 2003 – wissenschaftliches Programm

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CPP: Chemische Physik und Polymerphysik

CPP 22: POSTER C

CPP 22.59: Poster

Donnerstag, 27. März 2003, 12:00–14:00, ZEU/250

Adsorption of nanoparticles onto thin polymer brushes — •Nikolay Houbenov, Sergiy Minko, and Manfred Stamm — Institut fuer Polymerforschung, Dresden

In this study we investigate the interaction between charged nanoparticles and a thin polymer brush, composed of two oppositely charged polyelectrolytes. By a simple pH adjustment we can charge the surface positively or negatively in dependence which one of the polyelectrolytes occupies it.

We synthesized a 7 nm thick Poly(tert-butyl acrylate)-Poly(2-vinylpyridine) (PtBuA-P2VP, 1:1) brush via No-dqgrafting toNo-dq method and converted it to a polyelectrolyte brush Polyacrylic acid-Poly(2-vinylpyridine) (PAA-P2VP).a/par Polystyrene latex particles, d =15 nm, with SO3H (negative Zeta potential) and NR3+ (positive Zeta potential) functionalized surfaces were adsorbed onto the PAA-P2VP polyelectrolyte brush at varied pH of the aqueous medium. A strong particles adsorption was detected at pH values where the brush and the particles are oppositely charged. The main driving force for the adsorption was clarified as electrostatic. Not significant adsorption was observed around the isoelectric point of the substrate, at pH 5, and within the pH range where the componets are equally charged.