Dielectric properties of supercooled glycerol-water solutions

Dielectric properties of glycerol-water mixtures from 5 mHz to 2 MHz are studied over the temperature range 140 to 350 K. Dielectric relaxation time can be fitted according to the new free-volume percolation model of Cohen and Grest (1981, 1984). Static permittivity varies linearly with reciprocal temperature. Suitable extrapolations to zero glycerol concentration allowed the calculation of the dielectric relaxation time and the static permittivity of supercooled water with the relationship xi =-36.7+33980/T behavior is in good agreement with the random network model proposed by Sceats and Rice (1982).