A computer simulation is performed to study the dynamics of binary liquids in the pores of Vycor glasses. The pores are modeled with glass walls that form randomly interconnected tunnels. When the relaxation is probed with a particular wavelength, the time autocorrelation function depends on whether or not there is a significant periodic or quasiperiodic structure in the distribution of the walls with that wavelength. If there is not, the relaxation may be fitted as the sum of an exponential term and a nonexponential activated term. If there is, the relaxation shows a long-lasting tail that can be fitted by introducing an additional constant term in the above fitting function. The relaxation time measured from the exponential term supports the dynamic scaling with the same dynamic exponent as in the bulk. In the long length scales, however, the data show a trend of deviation from this scaling in the direction of faster relaxation. We interpret this behavior as a confining effect of the walls.
Physical Review E
(1995). Dynamics of Binary Liquids in Pores. Physical Review E, 52(6), 6368-6374.
Available at: http://aquila.usm.edu/fac_pubs/5995