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By Anatolii D. Zimon (auth.)

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Example text

Fuks [2] is correct in that the quantity r in Eq. 39) must not be considered the particle radius, but rather the radius of those submicroscopic projections through which actual contact occurs between the particle and surface. Hence, in Chapter V we will be examining the influence of surface roughness and radius of curvature of the contacting bodies on the magnitude of adhesion. In certain cases in which some specific force is responsible for adhesion (Chapters IV -VI), the force of adhesion can be calculated.

K. Then, the energy of interaction of a molecule of the surface with molecules of the particle at a distance of a, 2a, 3a, ... , ka will be E = - [Usn/en - m)] (I + 1/2m + 1/3m + ... 28) From Eq. (II. 27) it follows that the energy of interaction drops off sharply with increasing distance between the molecules of the condensed system and reaches a maximum at H = a when the gap between the condensed systems is of the same order as the distance between molecules and atoms of these systems. The number of molecules and atoms N of condensed systems participating in adhesive interaction is determined by the geometry of the contiguous bodies.

53), have different dimensions. The constantA is usually given in ergs, and the constant B in ergs· cm. The constants A and B can be determined by calculation, using Eqs. 44), and also on the basis of experimental data. In the latter case, it is necessary to measure the force of interaction of the bodies with a fixed gap between them, while observing conditions that will eliminate the effect of all components of adhesive interaction other than the molecular component. Let us examine the determination of the constant A in the case in which there is direct contact of the particle with the surface.

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