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

By Anatolii D. Zimon (auth.)

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The experimental data deviate by 10-15% from the results calculated on the basis of the Lifshits theory. The value of the constant B is determined by the properties of the contact surfaces, depending in particular on the thickness of the layer of metal deposited on the quartz [62] . 2. Values of Constant B Obtained as a Result of Measurements of Adhesive Force. B'10 19 , erg'cm Material and form of contiguous surfaces Sphere and plane (44) quartz/quartz Sphere and plane [57) quartz/quartz (fused) quartz/ quartz (crystalline) quartz/chromium Sphere and plane [58) quartz/ quartz quartz/ chromium quartz/thorium halides Sphere and plane [59) gold/ germanium gold/glass Quartz plates (44) Borosilicate glass plates (60) Plates (61) chrome steel chromium Radius, cm calculation experiment by Eq.

20) . 10- 19 ergs· cm. For quartz surfaces covered with a layer of metal, the constant B takes on higher values, increasing with increasing thickness of the metal layer [62]. 2-3) . 10 9 dyn/cm 2 • With allowance for electromagnetic lag, and with a gap of 20 A between these surfaces, the force of interaction is 3 . 5 . 106 dyn/cm 2 [63]. 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.

50) From a comparison of Eqs. 8. As can be seen from the data that have been presented (see p. 38), this is possible only if [0 ""* 00. In all other cases, calculations of the constant B by Eqs. 50) give different results; certain values are shown below in relation to the permittivity: [0 ............... B I . 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.

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