TY - JOUR
T1 - Dynamics of solvation in supercooled liquids confined to the pores of sol-gel glasses
AU - Streck, C.
AU - Melșnichenko, Yu B.
AU - Richert, R.
N1 - Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.
PY - 1996
Y1 - 1996
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 (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.
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 (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.
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U2 - 10.1103/PhysRevB.53.5341
DO - 10.1103/PhysRevB.53.5341
M3 - Article
AN - SCOPUS:0000615738
VL - 53
SP - 5341
EP - 5347
JO - Physical Review B-Condensed Matter
JF - Physical Review B-Condensed Matter
SN - 0163-1829
IS - 9
ER -