Dynamics of solvation in supercooled liquids confined to the pores of sol-gel glasses

C. Streck, Yu B. Melșnichenko, R. Richert

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Abstract

We have measured the solvation dynamics of the probe molecule quinoxaline in a glass-forming solvent, 2-methyltetrahydrofuran, geometrically confined to the pores of sol-gel glasses having nominal pore diameters (Formula presented) nm. Within the time range (Formula presented) the (Formula presented) process and a second extremely slow process are observed. On the basis of emission spectra, the latter relaxation is assigned to a surface layer with strongly frustrated dynamics, opposed to the picture of a certain fraction of pores entirely filled with liquid of reduced molecular mobility. According to the Stokes-shift results for porous samples, the thickness of this surface layer increases significantly with (Formula presented) for the system under study. The results are compared with solvation dynamic experiments for the bulk solvent and with dielectric relaxation measurements.

Original languageEnglish (US)
Pages (from-to)5341-5347
Number of pages7
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume53
Issue number9
DOIs
StatePublished - Jan 1 1996
Externally publishedYes

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ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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