Abstract
ONE of the common principles of contact electrification is that considerable electrification accompanies the relative motion of two surfaces only if one or both of them has a low electrical conductivity. Dealing with the electrification which occurs when a powder or sand flows down an inclined earthed metal surface, Hudson1 has shown, by an indirect method, that a typical insulator (zircon sand) acquires a much larger charge than a semiconductor (rutile sand). Hudson's findings were confirmed by measuring directly the charge acquired by these sands from various lengths of an earthed aluminium chute. Fig. 1 shows the results for sands of 114µ average particle size.
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References
Hudson, Proc. Australasian Inst. Min. Met., 145 (1950).
Vick, Brit. J. App. Phys., Supp. 2, S. 1 (1953). Henry, ibid., S.6 (1953).
Forrest, Brit. J. App. Phys., S. 37 (1953).
Peterson, J. App. Phys., 25, 501 (1954).
Mott and Gurney, “Electronic Processes in Ionic Crystals” (Clarendon Press, Oxford, 1940 and 1953).
de Boer, “Electron Emission and Adsorption Phenomena”, 43 (University Press, Cambridge, 1935).
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COOKE, B. Charge acquired by Powdered Salts on moving over Metal Surfaces. Nature 176, 264 (1955). https://doi.org/10.1038/176264a0
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DOI: https://doi.org/10.1038/176264a0
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