Glass-forming liquids in mesopores probed by solvation dynamic and dielectric techniques

X. Yan, C. Streck, Ranko Richert

Research output: Chapter in Book/Report/Conference proceedingConference contribution

12 Scopus citations

Abstract

The orientational dynamics of organic supercooled liquids of low molecular weight confined to the geometry of porous glasses are studied by two highly related techniques, the optical method of probing the dynamics of solvation regarding a chromophoric host molecule and dielectric relaxation spectroscopy. The dielectric results display marked effects of the confinement to mesopores in terms of altered structural dynamics which appear to separate into a faster and slower responses relative to the bulk liquid. We also demonstrate that there is no trivial relation between the ε*(ω) data and the liquid dynamics in these heterogeneous samples. These effects are partially paralleled by the solvation dynamics results, but with the spatial range inherent in the optical technique being inconsistent with associating the fast and slow dynamical components to spatially distinct regimes. We conclude on the slow component being a signature of non-ergodicity which arises from the competition between the length scale of cooperativity and the pore size.

Original languageEnglish (US)
Title of host publicationMaterials Research Society Symposium - Proceedings
PublisherMaterials Research Society
Pages33-44
Number of pages12
Volume464
StatePublished - 1997
Externally publishedYes
EventProceedings of the 1996 MRS Fall Meeting - Boston, MA, USA
Duration: Dec 2 1996Dec 5 1996

Other

OtherProceedings of the 1996 MRS Fall Meeting
CityBoston, MA, USA
Period12/2/9612/5/96

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials

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