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Suche nach „[A.] [Malygin]“ hat 5 Publikationen gefunden
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    NachhaltigF: Angewandte Naturwissenschaften und WirtschaftsingenieurwesenS: TSZ Weißenburg

    Beitrag (Sammelband oder Tagungsband)

    Dmitry Rychkov, Wirges, W., Gerhard, R., Rychkov, A. A., A. Malygin, Efimov, N.

    Stabilization of Positive Charge on FEP Electret Films Modified with Titanium-Tetrachloride Vapor: Formation of a Two-Dimensional Nanodielectric?

    2013 IEEE International Conference on Solid Dielectrics (ICSD)

    2013

    DOI: 10.1109/ICSD.2013.6619860

    Abstract anzeigen

    It has been shown recently that the stability of positively corona-charged polytetrafluoroethylene (PTFE) electrets is considerably enhanced as a result of a surface treatment with titanium-tetrachloride (TiCl 4 ) vapor. In the present study, we investigate the influence of a gas-phase treatment with TiCl 4 on the electret properties of tetrafluoroethylene-hexafluoropropylene copolymer (FEP) films. FEP-film samples were treated with titanium-tetrachloride vapor by means of a nanotechnological chemical process that is based on molecular-layer deposition. Subsequently, the samples were poled in a positive corona discharge at room temperature. A very significant improvement of the surface-charge stability has been observed on the modified FEP films. The phenomenon is not restricted to the thermal stability of the surface charge, but is also found in long-term charge-decay measurements. Typical relaxation times for positive charge under isothermal conditions are at least one order of magnitude higher after the surface modification. Thermally-stimulated-decay data indicate that the half-value temperatures of the vapor-treated samples have been enhanced to almost 200°C. Thus, the thermal stability of positive charge in modified FEP films may reach values that were so far only obtained on negatively charged FEP electrets. The results are discussed in connection with the formation of deep traps on the chemically modified polymer surfaces and in the context of two-dimensional surface-layer nanodielectrics.

    NachhaltigF: Angewandte Naturwissenschaften und WirtschaftsingenieurwesenS: TSZ Weißenburg

    Zeitschriftenartikel

    Dmitry Rychkov, Rychkov, A. A., Efimov, N., A. Malygin, Gerhard, R.

    Higher stabilities of positive and negative charge on tetrafluoroethylene–hexafluoropropylene copolymer (FEP) electrets treated with titanium-tetrachloride vapor

    Applied Physics A - Materials Science and Processing, vol. 112, no. 2, pp. 283-287

    2013

    DOI: 10.1007/s00339-013-7821-1

    Abstract anzeigen

    Tetrafluoroethylene–hexafluoropropylene copolymer (FEP) films were treated with titanium-tetrachloride vapor in a molecular-layer deposition process. As a result of the surface treatment, significant improvements of the thermal and temporal charge stability were observed. Charge-decay measurements revealed enhancements of the half-value temperatures and the relaxation times of positively charged FEP electrets by at least 120 °C and two orders of magnitude, respectively. Beyond previous publications on fluoropolymer electrets with surface modification, we here report enhanced charge stabilities of the FEP films charged in negative as well as in positive corona discharges. Even though the improvement for negatively charged FEP films is moderate (half-value temperature about 20 °C higher), our experiments show that the asymmetry in positive and negative charge stability that is typical for FEP electrets can be overcome by means of chemical surface treatments. The results are discussed in the context of the formation of modified surface layers with enhanced charge-trapping properties.

    NachhaltigF: Angewandte Naturwissenschaften und WirtschaftsingenieurwesenS: TSZ Weißenburg

    Zeitschriftenartikel

    Rychkov, A. A., S. Trifonov, A. Kuznetsov, E. Sosnov, Dmitry Rychkov, A. Malygin

    Influence of Chemical Modification of the Surface of Low-Density Polyethylene on Its Electret Properties

    Russian Journal of Applied Chemistry, vol. 80, no. 3, pp. 461-465

    2007

    DOI: 10.1134/S1070427207030214

    Abstract anzeigen

    The electret properties of low-density polyethylene with phosphorus-containing surface nanostructures were examined.

    NachhaltigF: Angewandte Naturwissenschaften und WirtschaftsingenieurwesenS: TSZ Weißenburg

    Zeitschriftenartikel

    Rychkov, A. A., A. Malygin, S. Trifonov, Dmitry Rychkov

    Influence of Chemical Modification of the Surface on the Electret Properties of Polytetrafluoroethylene

    Russian Journal of Applied Chemistry, vol. 77, no. 2, pp. 276-280

    2004

    DOI: 10.1023/B:RJAC.0000030366.96644.2c

    Abstract anzeigen

    Thermal stability of the electret state of polytetrafluoroethylene films with element oxide structures on the surface was studied. The frequency factor and the activation energies of the newly formed groups of deep centers that capture the electret charge were determined.

    NachhaltigF: Angewandte Naturwissenschaften und WirtschaftsingenieurwesenS: TSZ Weißenburg

    Beitrag (Sammelband oder Tagungsband)

    S. Trifonov, A. Malygin, Dmitry Rychkov

    The nature of electret charge traps in polymers with element-containing nanostructures on the surface

    Proceedings of the International Conference "INTERMATIC 2003"

    2003