Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/65170
Type: Artigo de periódico
Title: Electrochemical impedance studies of hybrids of perfluorosulfonic acid ionomer and silicon oxide by sol-gel reaction from solution
Author: Zoppi, RA
Nunes, SP
Abstract: Hybrids of Nafion (R) and silica were prepared from solution, growing the inorganic phase by hydrolysis/condensation of alkoxy silanes. Using tetraethoxysilane (TEOS) as the inorganic precursor, transparent and rigid films were obtained. Substituting part of the TEOS (20 wt% substitution) by 1,1,3,3 tetramethyl-1,3-diethoxydisiloxane (TMDES) more flexible films were obtained. These films were translucent and showed a phase segregation which was clearly observed by transmission electron microscopy. The ionic conductivity of the hybrids was measured by electrochemical impedance spectroscopy using two stainless steel electrodes, a frequency range of 0.1 to 10(5) Hz, and temperatures from 25 to 100 degrees C. Samples were also characterized by modulated differential scanning calorimetry. (C) 1998 Elsevier Science S.A. All rights reserved.
Subject: ionic conductivity
Nafion (R)
hybrid materials
composites
Country: Suíça
Editor: Elsevier Science Sa
Rights: fechado
Identifier DOI: 10.1016/S0022-0728(97)00513-5
Date Issue: 1998
Appears in Collections:Unicamp - Artigos e Outros Documentos

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