Raman spectroscopy studies of liquids confined to porous silica glasses
| Autor: | Yoo Joong Kim, Claus Czeslik, J. Jonas |
|---|---|
| Rok vydání: | 2000 |
| Předmět: |
Chemistry
Physics::Medical Physics Intermolecular force Analytical chemistry General Physics and Astronomy Condensed Matter::Soft Condensed Matter symbols.namesake Chemical physics symbols Vibrational energy relaxation Molecule Surface layer Physics::Chemical Physics Anisotropy Porosity Raman spectroscopy Rotational–vibrational coupling |
| Zdroj: | Le Journal de Physique IV. 10:Pr7-103 |
| ISSN: | 1155-4339 |
| Popis: | Raman spectroscopic experiments are presented to investigate the dynamics and structure of liquids confined to porous silica glasses. Using dimethyl sulfoxide (DMSO) as an illustrative example, it is reported that the vibrational correlation time of the SO stretching vibration in DMSO is decreased by confinement and scales with the reciprocal pore radius. This result is interpreted on the basis of a two-state model for surface and bulk molecules. The different contributions to the SO vibrational relaxation are discussed. Furthermore, using the noncoincidence of the isotropic and anisotropic Raman frequencies of the SO vibrational mode, which is a result of an intermolecular vibrational coupling, the surface layer structure of DMSO in pores of silica glass is derived. |
| Databáze: | OpenAIRE |
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