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  • 1
    Electronic Resource
    Electronic Resource
    Charge distribution in Teflon FEP (fluoroethylenepropylene) negatively corona-charged to high potentials (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 71 (1992), S. 2280-2284 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The charge distribution in negatively corona-charged Teflon FEP (fluoroethylenepropylene) films was investigated with the laser-induced pressure-pulse method. The 12.7- and 25.4-μm samples were charged to potentials up to −2500 and −4500 V, respectively, and thereafter stored at room temperature. Measurements of the charge distribution were taken at time intervals ranging from 1 min to several days after charging. The results indicate that the corona charge is initially trapped at the surface of the samples. A negative bulk charge which is nonuniformly distributed over the entire volume with a density of ∼1013 e/cm3 is found for samples kept at the highest voltages for periods of the order of hours. Within the resolution of the method, a spatial broadening of the surface-charge layer is not observed. These findings suggest that in highly surface-charged samples shallow-trapped holes in the bulk of the material, which compensate deeply trapped electrons, drift to the charged surface and thus cause the observed net-negative charge in the bulk.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.351127
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  • 2
    Electronic Resource
    Electronic Resource
    Polarization of thick polyvinylidene fluoride/trifluoroethylene copolymer films (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 80 (1996), S. 3982-3991 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Thick (800 μm) polyvinylidene fluoride/trifluoroethylene (P(VDF-TrFE)) copolymer films for transducer applications are poled under applied voltage at elevated temperatures. By using different heat treatments, poling temperatures, and poling time, we are able to prepare a uniformly poled film with a single resonance peak at 1.3 MHz, or a nonuniformly poled film with two resonances (1.3 and 2.6 MHz), or a film with bimorph structure with a single resonance at 2.6 MHz. The nonuniform polarization which arises from charge injection from the cathode is checked by the pressure wave propagation method. The polarization mechanisms in these thick films are expected to be similar to those previously reported for thin films. The results obtained in this work may lead to practical applications because they suggest a means for controlling transducer frequency by poling. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.363356
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  • 3
    Electronic Resource
    Electronic Resource
    Direct observation of injected charges at insulator-electrode interfaces in strongly diverging fields (1995)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 67 (1995), S. 1025-1027 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Various theoretical models have been proposed to explain the behavior of insulator-electrode interfaces in the case of strongly diverging electric fields. Until now, direct measurement of the charge transferred at these interfaces could not be performed. In this letter, we propose a novel structure which allows for such measurements. An application is presented in which charge transfer around 30 μm diameter wires embedded in an insulator is directly observed. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.114718
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  • 4
    Electronic Resource
    Electronic Resource
    Electrostatic imaging of particle trajectories
    Amsterdam : Elsevier
    Nuclear Instruments and Methods 192 (1982), S. 235-239 
    Details
    ISSN: 0029-554X
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0029-554X(82)90828-X
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  • 5
    Electronic Resource
    Electronic Resource
    Vapor-induced depolarization currents in electrets (1979)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Physics Edition 17 (1979), S. 95-101 
    Details
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The charge decay of polymer electrets in the presence of solvent vapor is analyzed. In order to account for this phenomenon, several hypotheses are considered and tested experimentally. It is shown that the penetration of the solvent is responsible for the observed charge decay, and that it is the rate limiting factor. Moreover, the phenomenon is not due to the screening of the injected charges, but to the motion of these charges, which are liberated by the penetration of the solvent. Finally, the possible applications of this phenomenon in investigations on both the microscopic and macroscopic scale are outlined.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1979.180170109
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