ABSTRACT
The kinetics of mass transfer processes is influenced by some changes of physical properties of liquids in thin layers such as viscosity, dielectric permittivities, density, surface tension and solvent power. Density oscillations caused by formation of a layered molecular structure are common for all, including nonpolar, liquids. The oscillations reflect the discrete liquid structure, the finite size of its molecules. Even in the absence of surface forces, a flat solid boundary is a strong structuring factor acting like a defect disturbing the structure of liquid layers adjacent to the surface. The density of the liquid placed in a cylindrical pore is only increased and the period of oscillations is lower. Some information about the distribution pattern may be gained from experiments with capillaries of various radii or porous bodies differing only by the mean pore size. The density of liquids in fine pores has been far less intensively investigated experimentally than viscosity.
