By Anatolii D. Zimon (auth.), Morton Corn (eds.)
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Additional info for Adhesion of Dust and Powder
Attempts to use these methods for determining the adhesive forces of microscopic particles direct1y have not so far yielded the desired results. ), and hence offer the possibility of obtaining reproducible results. In experiments intended to determine the forces of interaction between macroscopic particles one uses either two spherical particles of a diameter of the order of a few millimeters, or one such particle and aplane, or the fused ends of glass, quartz, or metal filaments (Fig. 12). The form of the ends may be rounded (a), spherical (b), or plane (c).
13). Then the plate is moved in a direction perpendicular to the area of contact. The deviation (angle a) of the suspended sphere from the vertical due to the action of the adhesive forces serves as a measure of the adhesion: Fad = mg sin a. Fig. 13. Pendulum method of determining forces of adhesion. Fig. 14. Principle of Stone's apparatus for determining the adhesive force between particles. 1) Glass fiber; 2) fused ends (or particles); 3) micrometer. 10) The angle a is either measured directly [48, 81, 82] or calculated from the deviation (measured with a micrometer) of the filament with the fused end from the original position (Fig.
However, the theory of London dispersion forces on which the calculations in question are based takes no account of electromagnetic lagging. This is equivalent to the assumption that the rate of propagation of electromagnetic waves is infinitely great and the distances between the molecules infinitely small compared with the absorption wavelengths A which are characteristic of the atoms and molecules of the contiguous bodies. , when it is of the order of magnitude of the absorption wavelengths of the ato~s and molecules (for - H; -0; -CH3 ; -OH; -Cl; -F this is 5-7 A).
Adhesion of Dust and Powder by Anatolii D. Zimon (auth.), Morton Corn (eds.)