Results 141 to 150 of about 45,213 (186)

Contact electrification of metals

Journal of Physics D: Applied Physics, 1975
The author has measured the electrostatic charging of two metal bodies which have been brought into contact and then separated. The charge Q is found to be given by Q=C0Vc, where Vc is the contact potential difference and C0 is the 'contact capacitance'.
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Contact electrification of semiconductors

British Journal of Applied Physics, 1960
Recently published experimental findings on the electrification of rutile powder by sliding down a metal chute can be explained by an extension of the present author's theory of the separation electrification of metals. The mechanism of the electrification of insulators must, in most cases, be quite different.
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Ice‐crystal contact electrification

Quarterly Journal of the Royal Meteorological Society, 1960
AbstractAn experimental investigation of electrification accompanying the momentary single contact of vapourgrown ice crystals at the same or at different temperatures suggests than any such effect is much smaller than might be expected from Reynolds's report on charging observed with riming spheres and vapour‐grown ice crystals.
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Contact electrification and surface composition

Journal of Physics D: Applied Physics, 1995
We have studied the charge transfer to polypropylene films containing varying concentrations of amide (donor) and fluorine (acceptor) groups grafted onto the polymer backbone. Pure polypropylene charges very weakly but the addition of amide causes the charging to become strongly positive, and fluorine causes it to become strongly negative.
W J Brennan, J Lowell, G W Fellows, M P W Wilson   +3 more
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Ion transfer in contact electrification

SPIE Proceedings, 1990
The contact charge on polymers is influenced by added organic salts, and the charge is higher when the additive is polymer-bound rather than molecular.'7 In our studies, the presence of an ionomer consisting of a polystyrene random copolymer with pendent N-methylpyridinium toluenesulfonate groups in the host resin produces a positive charge, and the ...
Arthur F. Diaz, Debra Fenzel-Alexander, Daphne Wollmann, A. Eisenberg   +3 more
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Contact electrification of insulating materials

Journal of Physics D: Applied Physics, 2011
The electrostatic charge that is generated when two materials are contacted or rubbed and then separated is a well-known physical process that has been studied for more than 2500 years. Contact electrification occurs in many contexts, both natural and technological.
Daniel J Lacks, R Mohan Sankaran
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Theory of contact electrification

British Journal of Applied Physics, 1953
After an outline of the relevant parts of the modern theory of solids, the transfer of electrons when metals, semiconductors and insulators are placed in contact is discussed. The importance of surface states is stressed.
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Gas breakdown in contact electrification

Journal of Physics D: Applied Physics, 1992
Electrification of various materials (silicon, epoxy resin and coal) by repeated contact with a metal plate has been investigated. The authors observed gas breakdown in a nitrogen atmosphere upon separation of the contact partners. The total amount of charge acquired by the surfaces on contact is reduced at higher gas pressures.
B A Kwetkus, K Sattler, H -C Siegmann
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Air Breakdown in Contact Electrification

2022
Contact electrification of solids in a gas medium involves two stages, i.e., surface charge deposition immediately at separation, and dissipation due to dielectric breakdown of the medium as the gap increases. The presumption that such gas breakdown obeys Paschen's law, which is conventionally determined for gas between electrodes with constant charge ...
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Contact electrification of dielectric solids

Journal of Electrostatics, 1978
Abstract The main questions of the basic concept dealing with contact electrification of dielectric solids are summarized. Recent results which have a direct bearing on static electrification of polymer solids are reviewed. Differences between equilibrium contact electrification, transient contact electrification, and steady-state contact ...
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