Solid State Physics

Download e-book for kindle: Adhesion of Dust and Powder by Anatolii D. Zimon (auth.)

By Anatolii D. Zimon (auth.)

ISBN-10: 1461585767

ISBN-13: 9781461585763

ISBN-10: 1461585783

ISBN-13: 9781461585787

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I and the constant A for NaCI molecules; the respective values were 10-58 erg· cm 6 and ~ 10- 12 erg. The calculation of the constant A can be performed by a different method. , without accounting for electromagnetic lag, can be represented not only by Eq. 54) The quantity hv by analogy with the constant of molecular interaction, is ADHESION, MOLECULAR INTERACTION, AND SURFACE ROUGHNESS 43 sometimes called the Lifshits constant. This quantity is equal to 00 hv=1i ~ [(Si. 55) where ~ is the argument, the same as in Eq.

If the gap is increased to 104 A, the force of interaction drops to 5 . 10-3 dyn/cm 2 [60]. Experimental data on the change in molecular interaction as a function of the gap separating the contiguous bodies offer the possibility of testing the validity of Eqs. 42). It was found in [57] that, in all cases of interaction of a spherical surface with a plane surface, the relationship between log F and log H is linear and has a slope equal to 3; i. , the force of molecular interaction is inversely proportional to H3.

10 19 [Eq. 49)] B2 . 10 19 [Eq. 0 ... 65 Let us emphasize the basic difference in the expressions for the interaction energy between two condensed bodies as obtained by Hamaker and by Lifshits. The interaction energy according to Hamaker is represented in the form of two factors where II (t: I , t:2) is a function depending on the properties (in particular the permittivity) of the contiguous bodies t: I and the medium t:2; 12 (Q) is a function that is determined by the geometric configuration of the contiguous bodies [47].

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Adhesion of Dust and Powder by Anatolii D. Zimon (auth.)

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