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Broad-spectrum enhancement of polymer composite dielectric constant at ultralow volume fractions of silica-supported copper nanoparticles.
Kofod, Guggi; Risse, Sebastian; Stoyanov, Hristiyan; McCarthy, Denis N; Sokolov, Sergey; Kraehnert, Ralph.
Afiliação
  • Kofod G; Institute of Physics and Astronomy, University of Potsdam, Karl Liebknecht Strasse 24-25, 14476 Potsdam-Golm, Germany. gkofod@uni-potsdam.de
ACS Nano ; 5(3): 1623-9, 2011 Mar 22.
Article em En | MEDLINE | ID: mdl-21302931
A new strategy for the synthesis of high permittivity polymer composites is demonstrated based on well-defined spatial distribution of ultralow amounts of conductive nanoparticles. The spatial distribution was realized by immobilizing Cu nanoparticles within the pore system of silica microspheres, preventing direct contact between individual Cu particles. Both Cu-loaded and unloaded silica microspheres were then used as fillers in polymer composites prepared with thermoplastic SEBS rubber as the matrix. With a metallic Cu content of about 0.10 vol % [corrected] in the composite, a relative increase of 94% in real permittivity was obtained. No Cu-induced relaxations were observed in the dielectric spectrum within the studied frequency range of 0.1 Hz to 1 MHz. When related to the amount of conductive nanoparticles, the obtained composites achieve the highest broad-spectrum enhancement of permittivity ever reported for a polymer-based composite.
Assuntos

Texto completo: 1 Base de dados: MEDLINE Assunto principal: Dióxido de Silício / Cobre / Cristalização / Nanoestruturas Idioma: En Ano de publicação: 2011 Tipo de documento: Article

Texto completo: 1 Base de dados: MEDLINE Assunto principal: Dióxido de Silício / Cobre / Cristalização / Nanoestruturas Idioma: En Ano de publicação: 2011 Tipo de documento: Article