Berlin 2005 – wissenschaftliches Programm

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O: Oberflächenphysik

O 15: Postersitzung (Adsorption an Oberfl
ächen, Epitaxie und Wachstum, Organische Dünnschichten, Oxide und Isolatoren, Rastersondentechniken, Zeitaufgelöste Spektroskopie, Methoden)

O 15.16: Poster

Freitag, 4. März 2005, 17:00–20:00, Poster TU D

Engineering the Adsorption of Latex Spheres on Charged Surfaces II: Switching the Surface Charge by Adsorption of Layered Double Hydroxides on Mica — •D. Rapp¹, H. Gliemann², P.G. Weidler¹, R. Nüesch¹, Th. Schimmel^2,3, Y. Mei⁴, A. Wittemann⁴, G. Sharma⁴, and M. Ballauff⁴ — ¹ITC-WGT, Forschungszentrum Karlsruhe, 76021 Karlsruhe — ²INT, Forschungszentrum Karlsruhe, 76021 Karlsruhe — ³Institut für Angewandte Physik, Universität Karlsruhe, 76128 Karlsruhe — ⁴Institut für Physikalische Chemie I, Universität Bayreuth, 95447 Bayreuth

Layered Double Hydroxides (LDH) are rare in nature but easy to synthesize in the laboratory. Because of their positive layer charge LDH can be used to modify negatively charged surfaces or to adsorb negatively charged particles (e.g. polymer particles). The applications of polymer nanoparticles (like coatings or paints) are based on the adsorption of the particles on organic or inorganic surfaces. Therefore the investigation of the adsorption behavior of spherical core-shell polymer particles with negatively charged chains (anionic SPB) on different charged inorganic surfaces was aim of this work. As negatively charged substrate we used freshly cleaved mica. AFM investigations of anionic SPB adsorbed on mica showed the formation of a densely packed particle layer with a two-dimensional long-range order. By the adsorption of LDH on mica the surface charge of the substrate was switched from negative to positive. On this modified surface anionic SPB adsorb as single particles.