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O: Oberflächenphysik

O 13: Solid-liquid interfaces

O 13.10: Talk

Monday, March 27, 2006, 17:15–17:30, WIL C207

Probing interfaces of particle suspensions using vibrational sum frequency scattering — •Sylvie Roke — Max-Planck Institute for Metals Research, Heisenbergstr. 3, Stuttgart, Germany

Many important chemical, physical and biological phenomena occur at interfaces of particles in suspension. Most of the tools presently available to study these interfaces use invasive techniques or model systems. Ideally, one would want a non-invasive technique that allows to study interface structure and dynamics with molecular specificity.

We have for the first time used the nonlinear optical technique vibrational sum frequency generation to study the interfaces of sub-micron particles in suspension. As a model system we use a suspension of silica particles covered with alkane (C18) chains [1]. We obtain information about the molecular structure (molecular order and orientation) as well as particle morphology, by analyzing both the spectra as well as the angle dependent scattered intensity. Finally, we show that the interfacial order and structure is strongly influenced by the solvent [3].

[1] S. Roke, W. G. Roeterdink, J. E. G. J. Wijnhoven, A. V. Petukhov, A. W. Kleyn and M. Bonn, Phys. Rev. Lett., 91, 258302 (2003)

[2] S. Roke, M. Bonn, A. V. Petukhov, Phys. Rev. B, 70, 115106 (2004)

[3] S. Roke, J. Buitenhuis, J. C. van Miltenburg, M. Bonn and A van Blaaderen, J. Phys. Condens. Matter, 17, S3469 (2005)