By Anatolii D. Zimon (auth.), Morton Corn (eds.)

ISBN-10: 148996276X

ISBN-13: 9781489962768

ISBN-10: 1489966005

ISBN-13: 9781489966001

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The plate]. Under our conditions, ßZ/Z < 5%. The error associated with the determination of ßl/ Z may be reduced if only particles lying on the axis of the plate are considered (ßZ ~ 0). , ßdp/ d av ' was considered earlier (page 40). 7)], we may conclude that the main error in the centrifugal method is due to the different sizes of the particles in a specified fraction. In order to avoid errors associated with the rate of rotation, we must increase (or reduce) the revolutions of the centrifuge smoothly in order to eliminate the effects of inertial forces, holding the specified number of revolutions for several seconds (16].

London interaction is valid for two very rarefied systems. e •• gases. The extension of the additivity of the forces to condensed systems not constituting a simple sum of free molecules has not yet been given a firm theoretical basis. 24 [CH. I FUNDAMENTAL CONCEPTS a b Fig. 8. Interaction between two spherical particles (a) and between a particle and a plane (b). However, Bradley [43] experimentally determined the force of interaction between two quartz and borate spheres; the result was close to the calculated value obtained on the principle of additive molecular interaction.

28) where his Planck's constant. vi and Vj are the frequencies of the oscillations of the interacting electron oscillators. j are the polarizabilities of molecules i and j. A characteristic feature of the dispersion (London) forces is their additivity. A molecule induces periodic dipoles in several neighboring molecules. The induced dipole is attracted to the original dipole. In view of this. the energy of attraction between the two bodies may be regarded as the sum of the energies of attraction between the corresponding pairs of molecules forming the bodies in question.

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Adhesion of Dust and Powder by Anatolii D. Zimon (auth.), Morton Corn (eds.)


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