Dresden 2006 – wissenschaftliches Programm

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CPP: Chemische Physik und Polymerphysik

CPP 12: POSTER Colloids, Nanoparticles and Self-Organizing Systems

CPP 12.23: Poster

Dienstag, 28. März 2006, 17:00–19:00, P3

Self-Assembly of Inorganic and Biological Nanoparticles at Fluid Interfaces: Kinetics and Structure Formation — •Sergej Koutouzov, Günther Jutz, Michaela Hoffmann, and Alexander Böker — Lehrstuhl für Physikalische Chemie II, Universität Bayreuth, 95440 Bayreuth, Germany

We report on the self-assembly processes of photoluminescent CdSe nanoparticles and fluorescently labeled CPMV bionanoparticles at oil/water liquid interfaces and their ability to stabilize so-called Pickering emulsions. The adsorption kinetics and particle density at the interface were followed by the changes in interfacial tension during the particle segregation to the interface using a pendant drop tensiometer. In addition, we monitored the increase in luminescence or fluorescence light emission from the interface via 2-dimensional spectroscopy, which allows for a time resolved direct determination of the particle concentration gradient at the interface. Concentration as well as size dependence of the nanoparticle diffusion to the interface was investigated using the above mentioned methods. Finally, the morphology of the resulting aggregates was investigated using TEM.