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Study of Redlich-Kwong and Virial equations in the case of bidimensional films

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Simple models of adsorption of gas or of liquid on solids have been proposed. The formation and study of bidimensional films have been constantly developed over the last few years because of their commercial and practical interests. The proposed models were transposed from the tridimensional state to the bidimensional state, e.g. as in the Redlich-Kwong and Virial models. These models were then tested experimentally and compared with the classical models of Langmuir, Van der Waals, Volmer, and Fowler and Guggenheim. We have shown by calculus that the bidimensional critical isotherms of Redlich-Kwong and Virial are given by the following equations: where Pr and r, are, respectively, the reduced pressure and the reduced rate of recovery for a monolayer; Ω1, Ω2, Ω3 and Ω4 are known numerical constants. These two models concur the best with the experiments and allow us to explain the transitions of bidimensional phases.

Affiliations: 1: CNRS Mulhouse, 24, avenue du President Kennedy, 68200 Mulhouse, France


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