Berlin 2012 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

CPP: Fachverband Chemische Physik und Polymerphysik

CPP 8: Poster: Nanoparticles and Composite Materials

CPP 8.11: Poster

Montag, 26. März 2012, 17:30–20:00, Poster A

Stabilizing Foams with Nanoparticles — •Adrian Carl and Regine von Klitzing — Stranski-Laboratorium, Institute of Chemistry, Berlin Institute of Technology, Strasse des 17. Juni 124, 10623 Berlin, Germany

In the recent years, it has been show by various groups that nanoparticles can be used to stabilize aqueous and oily foams [1]. The stabilization can be achieved without the use of surfactants. By appropriate tuning of the nanoparticle wetting properties, the adsorption of particles to the interface can be strongly favored. Due to the irreversible attachment of nanoparticles at the air/water interface, the surface elasticity and rheology of those foams is remarkably different from foams stabilized by surfactants. Various approaches can be used to hydrophobize particles. In addition, the process of foam formation has a strong impact on the resulting foam structure. An optimum in foamability of particle solutions is found for intermediate wettability.

Our work focuses on basic understanding of how the surface properties of modified silica nanoparticles influence their wetting behavior. Nanoparticles with varying degrees of functionalization and the resulting foams were characterized by scattering and microscopic techniques to gain insight into the governing principles of this comparatively young research field.

[1] A. Carl, R. von Klitzing, Angew. Chem., Int. Ed. 2011, 50, 11290-11292