SURFACE ROUGHNESS EFFECT IN THE KINETICS OF HETEROGENEOUS PROCESSES

Abstract

The review analyzes and gives generalization of the data on the role of geometric inhomogeneity of solid surfaces in the kinetics of heterogeneous processes. The generalized classi¿ cation of rough surfaces on the type and size of irregularities is given. The basic approaches to the mathematical description of fractal and non-fractal interfaces, as well as methods of modeling the diffusion-controlled processes taking into account the roughness effect are discussed. It is shown that the problem of interface roughness is quite versatile in the physical chemistry of heterogeneous processes. Obviously, this effect is complex, and it is of non-linear manner and should manifest itself in the kinetics of diffusion-controlled processes studied by different transient methods. Therefore, their correct application to establish the diffusion-kinetic parameters of such processes is possible only on the basis of the solution of the corresponding non-stationary problem, taking into account the roughness effect. Of particular note is the question of its role in the mixed kinetics of heterogeneous processes, as well as in the case of diffusion fluxes conjugation at the interface. It is necessary to systematically analyze the role of geometrical irregularities of various fractal and non-fractal type with the same roughness factor in the value of the measured extensive characteristics of a physicochemical process.