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

ISBN-10: 148996276X

ISBN-13: 9781489962768

ISBN-10: 1489966005

ISBN-13: 9781489966001

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Acceleration acting on a particle on rotating the dustladen surface around a horizontal axis. a) General case ö b) particle lying on the surface ö c) hanging particle. a b c Hg. H. 7. Acceleration acting on a particle on rotating the dustladen surface around a vertical axis. a, b, c) See Fig. 6. Fig. 8. Plate holder with rotating head. 1) Test plate ö 2) rotating head ö 3) axis. [eH. H § 6] DETACHMENT OF MICROPARTICLES 43 For an air medium, when Pi» P2' and for w 2x» g, Eq. 6) The centrifugal method has been widely used for determining adhesive forces both in air [10, 16,45, 63-66] and in liquids [10, 45, 59].

1) Thermostat; 2) vessel containing solution; 3) cassette for samples; 4) stand; 5) thread carrying weight. [CH. II place in the zone of contact between the dust particles and substrate as functions of time. The apparatus consists of three units: I) a system for vibrating the dust-laden plates; II) an amplification (electrometric) system; and, III) a photographic unit. Both the sign and absolute magnitude of the charge arising as a result of contact or disconnection between the particles and test surfaces may be determined in this way; the variation in the charge on the particles may be determined as a function of time both visually and photographically, and the relationship between the adhesive force of the dust and the charge on breaking contact may be established by varying the value of the detaching force (the smallest value of charge capable of determination is 5 • 10- 13 C).

Then the original substrate is placed at the appropriate angle in the sockets of the centrifuge. or else a holder (Fig. 8) with a rotating head for the plate is employed. 7) where B is the error of determination in %. The error represented by the quantity tm/ n (curve 2. Fig. 9) depends on the accuracy of measuring the rotations of the centrifuge. For TsLN and TsUM centrifuges, tm == 200 rpm. In air, the detachment of the particles usually occurs at n > 4000 rpm. * In this case the experimental error is no greater than 10%.

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

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