Results 201 to 210 of about 3,348 (242)

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'.
openaire   +1 more source

Contact electrification using force microscopy

Physical Review Letters, 1989
One of the oldest unresolved problems in physics is the mechanism of charge exchange between contacting surfaces when at least one of them is insulating. We describe a new technique, using force microscopy, for studying this problem with greater lateral resolution than has been previously possible. The force microscope is shown to have 0.2 \ensuremath{\
, Terris, , Stern, , Rugar, , Mamin
openaire   +2 more sources

Electrons on dielectrics and contact electrification

Chemical Physics Letters, 2009
Surfaces of dielectrics (insulators) often become charged following contact with metals, semiconductors, and dielectrics with or without rubbing. The mechanism and participants in the charge transfer (electrons or ions), although widely investigated, are still controversial.
Chong-yang Liu, Allen J. Bard
openaire   +1 more source

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.
openaire   +1 more source

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
openaire   +1 more source

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.
openaire   +1 more source

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
openaire   +1 more source

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
openaire   +1 more source

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
openaire   +1 more source

Contact electrification-why is it variable?

Journal of Physics D: Applied Physics, 1988
Research into the causes of triboelectrification is hampered by the well known problem of irreproducibility. Charge transfer by contact of a metal to a polymer, for example, may vary widely from one contact to another, even on the surface of a single polymer sample.
J Lowell, A R Akande
openaire   +1 more source