Abstract
Comparative patterns of equilibrium adsorption of argon on the surface of graphitized thermal carbon black (GCB) and the inhomogeneous surfaces of nongraphitized carbon black and silica at 77 and 87.3 K were considered. It was shown that argon acquires the properties of a special phase with a layered structure and exhibits two-dimensional phase transitions with the formation of crystal-like layers near the homogeneous surface of GCB even at a temperature exceeding the triple point. However, already at a distance of three-four molecular diameters from the surface, adsorbed argon behaves as a bulk phase in a weak external field. The defect surface of nongraphitized carbon black and the amorphous surface structure of silica destroy the longrange order of adsorbed argon and lower its solidification temperature. Therefore, argon adsorbed at a temperature of 77 K, i.e., below the triple point, exhibits the properties of a supercooled liquid. The applicability of density functional theory to describe argon isotherms and heat of adsorption on inhomogeneous surfaces was demonstrated.
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Original Russian Text © E.A. Ustinov, 2008, published in Zhurnal Fizicheskoi Khimii, 2008, Vol. 82, No. 12, pp. 2367–2375.
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Ustinov, E.A. The special features of equilibrium adsorption of argon on homogeneous and inhomogeneous surfaces. Russ. J. Phys. Chem. 82, 2134–2141 (2008). https://doi.org/10.1134/S0036024408120285
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DOI: https://doi.org/10.1134/S0036024408120285