Effect of the collective motions of molecules inside a condensed phase on fluctuations in the density of small bodies
- Authors: Tovbin Y.K.1
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Affiliations:
- Karpov Institute of Physical Chemistry
- Issue: Vol 91, No 11 (2017)
- Pages: 2271-2274
- Section: Short Communications
- URL: https://journals.rcsi.science/0036-0244/article/view/169782
- DOI: https://doi.org/10.1134/S0036024417110292
- ID: 169782
Cite item
Abstract
An approach to calculating the effects of fluctuations in density that considers the collective motions of molecules in small condensed phases (e.g., droplets, microcrystals, adsorption at microcrystal faces) is proposed. Statistical sums of the vibrational, rotational, and translational motions of molecules are of a collective character expressed in the dependences of these statistical sums on the local configurations of neighboring molecules. This changes their individual contributions to the free energy and modifies fluctuations in density in the inner homogeneous regions of small bodies. Interactions between nearest neighbors are considered in a quasi-chemical approximation that reflects the effects of short-range direct correlations. Expressions for isotherms relating the densities of mixture components to the chemical potentials in a thermostat are obtained, along with equations for pair distribution functions.
About the authors
Yu. K. Tovbin
Karpov Institute of Physical Chemistry
Author for correspondence.
Email: tovbin@cc.nifhi.ac.ru
Russian Federation, Moscow, 105064