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 ø=2.5, 5.0, and 7.5 nm. Within the time range l ms≤t≤l s the a 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 Tg←T for the system under study. The results are compared with solvation dynamic experiments for the bulk solvent and with dielectric relaxation measurements.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 5341-5347 |
| Number of pages | 7 |
| Journal | Physical Review B - Condensed Matter and Materials Physics |
| Volume | 53 |
| Issue number | 9 |
| State | Published - Mar 1 1996 |
| Externally published | Yes |
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ASJC Scopus subject areas
- Condensed Matter Physics
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Dynamics of solvation in supercooled liquids confined to the pores of sol-gel glasses. / Streck, C.; Mel'nichenko, Yu B.; Richert, Ranko.
In: Physical Review B - Condensed Matter and Materials Physics, Vol. 53, No. 9, 01.03.1996, p. 5341-5347.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Dynamics of solvation in supercooled liquids confined to the pores of sol-gel glasses
AU - Streck, C.
AU - Mel'nichenko, Yu B.
AU - Richert, Ranko
PY - 1996/3/1
Y1 - 1996/3/1
N2 - 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 ø=2.5, 5.0, and 7.5 nm. Within the time range l ms≤t≤l s the a 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 Tg←T for the system under study. The results are compared with solvation dynamic experiments for the bulk solvent and with dielectric relaxation measurements.
AB - 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 ø=2.5, 5.0, and 7.5 nm. Within the time range l ms≤t≤l s the a 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 Tg←T for the system under study. The results are compared with solvation dynamic experiments for the bulk solvent and with dielectric relaxation measurements.
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UR - http://www.scopus.com/inward/citedby.url?scp=0000615738&partnerID=8YFLogxK
M3 - Article
VL - 53
SP - 5341
EP - 5347
JO - Physical Review B-Condensed Matter
JF - Physical Review B-Condensed Matter
SN - 0163-1829
IS - 9
ER -