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CPP: Chemische Physik und Polymerphysik
CPP 30: POSTER: Chemical physics
CPP 30.39: Poster
Dienstag, 8. März 2005, 16:30–18:30, Poster TU D
Amphiphilic Colloidal Particles at the Water-Air and the Water-Dodecane Interface — •Reinhard Sigel1, Lakshmanan Sannachi1, Javier I. Amalvy2, and Steve P. Armes2 — 1Max-Planck-Institut of Colloids and Interfaces, Am Mühlenberg 1, D-14476 Golm — 2University of Sussex, Brighton, UK
For sterically stabilized polystyrene latex particles it was shown before that they reduce the surface tension of water [1]. This amphiphilic property is due to the [2-(dimethylamino)ethyl methacrylate-block-methyl methacrylate] [PDMA-b-PMMA] diblock copolymer used as stabilizer in the dispersion polymerisation. In addition, the hydrophilic character of the spherical PDMA brush can be adjusted by changing the solution pH.
For the investigation of the particle location in the interface and the interface concentration, ellipsometric measurements at the water-air and water-dodecane interface were performed for different pH-values and temperatures. Difficulties in ellipsometry for this specific system are discussed and first results are presented.
[1] J. I. Amalvy, S. P. Armes, B. P. Binks, J. A. Rodrigues, and G-F. Unali, Chem. Commun., 1826 (2003)