RELAXATION IN RANDOM PORES

To study the dynamics of a binary liquid mixture in glass pores we hav e performed a molecular dynamics simulation and measured the concentra tion fluctuation autocorrelation function F-m(q,t) and several other d ynamic functions. The relaxation pattern of F-m may be described with an exponentially decaying diffusion term and a logarithmically decayin g activation term. Although the system is at a very high temperature i n the one-phase region, the results for the velocity autocorrelation f unctions and the mean-square displacement functions are deceptively si milar to those of the bulk when the bulk is in its two-phase region. W e discuss what this may mean when the pore size is very large. (C) 199 8 American Institute of Physics.