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Microheterogeneous systems and the phase rule

  • Chemical Thermodynamics and Thermochemistry
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Abstract

The correctness of using the macroscopic Gibbs phase rule in microheterogeneous systems is considered. Results from using molecular theory are discussed for a single-component substance in describing delamination and fusion on open surfaces and in the pores of a solid, along with the interfaces between three states of a substance in the bulk phase. It is established that the form of adsorption system phase diagrams is determined by the surface potential, depending on the composition and structure of heterogeneous surfaces, and is characterized by multiple first-order phase transitions. It is concluded that the thermodynamic approach to heterogeneous systems makes any microscale description of the real interface distribution of molecules less accurate, and all quasithermodynamic theories are insufficiently precise for describing small systems (adsorption systems and interfaces).

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Authors and Affiliations

  1. Karpov Physicochemical Research Institute, Moscow, 103064, Russia

    Yu. K. Tovbin

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  1. Yu. K. Tovbin
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Correspondence to Yu. K. Tovbin.

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Original Russian Text © Yu.K. Tovbin, 2013, published in Zhurnal Fizicheskoi Khimii, 2013, Vol. 87, No. 6, pp. 928–936.

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Tovbin, Y.K. Microheterogeneous systems and the phase rule. Russ. J. Phys. Chem. 87, 906–914 (2013). https://doi.org/10.1134/S0036024413060290

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  • DOI: https://doi.org/10.1134/S0036024413060290

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