SELF-DIFFUSION OF ETHANOL IN SILICA-GELS

The peculiarities of ethanol self-diffusion in silica gels of differen t concentrations were studied by the quasi-elastic neutron scattering method. The full self-diffusion coefficient and also its components, w hich correspond to collective and single-particle diffusion modes of s olute molecules, were determined. It was established that scattering o il obstacles (monomers) influences the collective motion of ethanol mo lecules, while their single-particle diffusion is characterized mainly by hydrodynamic self-interactions of diffusible molecules.