Abstract
An equation for the mutual diffusion coefficient for the components of a binary mixture occurring in various aggregation states has been derived. Situations of this type arise in narrow pores in which the adsorbate density sharply changes across the pore cross-section. The equation was derived with the assumption that molecules of the mixture components have a spherical shape and are similar in size. The constructed equations are based on the lattice-gas model applicable to any aggregation state. The migration of particles is described in terms of the transition state theory. At low mixture densities corresponding to an ideal gas phase, the equations are based on expressions of the rigorous kinetic theory of gases. The theory takes into account the change in the mechanism of particle migration in different phases: from pair collisions for the gas to the overcoming of the activation barrier by thermofluctuation for dense phases.
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Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 8, pp. 1717–1725, August, 2005.
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Tovbin, Y.K. Mutual diffusion coefficient in binary mixtures in different aggregation states. Russ Chem Bull 54, 1768–1776 (2005). https://doi.org/10.1007/s11172-006-0035-3
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DOI: https://doi.org/10.1007/s11172-006-0035-3