Features of Molecular Interaction in Liquid Media

The constant of molecular interaction under these conditions is determined by the following expression  

For two identical solid bodies, when Aio -A20, Eq (11.82) assumes the form 

Having substituted the expressions (11.84) into Eq. (11.82), we obtain after appropriate simplifications 

The energy of interaction between surfaces separated by a layer of electrolyte can be determined on the basis of the properties of the boundary layers of liquid (see Section 26), and the width of the gap is determined from the following formula  

Malkina and Deryagin, using a value of equilibrium adhesion that they had determined by means of a crossed-fiber method [7, p. 206], obtained a value. 4 = 1.3 10 erg in an aqueous medium. This value of A, however, cannot be regarded as sufficiently accurate since the width of the gap separating the contiguous solids was not measured, but was rather assumed by Malkina and Deryagin to be 10 cm. The value of A can be determined on the basis of Eqs. (II.8) and (II.9). 

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