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Registro Completo |
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Biblioteca(s): |
Embrapa Instrumentação. |
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Data corrente: |
01/03/2005 |
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Data da última atualização: |
25/04/2008 |
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Autoria: |
MELLO, S. V.; MATTOSO, L. H. C.; SANTOS JÚNIOR J. R.; GONÇALVES, D.; FARIA, R. M.; OLIVEIRA JÚNIOR, O. N. |
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Título: |
Electrochemical response of poly(o-ethoxyaniline) films produced by different techniques. |
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Ano de publicação: |
1995 |
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Fonte/Imprenta: |
Electrochimica Acta, Elmsford, v. 40, n. 12, p. 1851-1855, 1995. |
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Idioma: |
Inglês |
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Conteúdo: |
Poly(o-ethoxyanilines) (POEA) were synthesized electrochemically and chemicalIy in aqueous acid media. POEA films were readily obtained during the electrochemical deposition on platinum electrodes, while the chemicalIy synthesized material was processed in the form of films either by drop coating or by Langmuir-Blodgett (LB) deposition. The open circuit potential values measured during the chemical synthesis, as welI as the color changes observed, are in close agreement with those of the electro-polymerization indicating basicalIy the same changes in oxidation states of the polymer structures. The electrochemical response of alI films was investigated by cyclic voltammetry. Two redox processes were observed after stabilization in the electrolyte solution, which are associated with interconversion reactions involving different oxidation and protonation states. Ultra-thin LB films required the shortest time for stabilization. POEA films displayed electrochromism, with color changes from yelIow to violet as a function of the potential. |
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Palavras-Chave: |
filmes; Langmuir-Blodgett (LB); Polímeros condutores; Resposta eletroquímica; síntese. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01760naa a2200241 a 4500
001 1028827
005 2008-04-25
008 1995 bl --- 0-- u #d
100 1 $aMELLO, S. V.
245 $aElectrochemical response of poly(o-ethoxyaniline) films produced by different techniques.
260 $c1995
520 $aPoly(o-ethoxyanilines) (POEA) were synthesized electrochemically and chemicalIy in aqueous acid media. POEA films were readily obtained during the electrochemical deposition on platinum electrodes, while the chemicalIy synthesized material was processed in the form of films either by drop coating or by Langmuir-Blodgett (LB) deposition. The open circuit potential values measured during the chemical synthesis, as welI as the color changes observed, are in close agreement with those of the electro-polymerization indicating basicalIy the same changes in oxidation states of the polymer structures. The electrochemical response of alI films was investigated by cyclic voltammetry. Two redox processes were observed after stabilization in the electrolyte solution, which are associated with interconversion reactions involving different oxidation and protonation states. Ultra-thin LB films required the shortest time for stabilization. POEA films displayed electrochromism, with color changes from yelIow to violet as a function of the potential.
653 $afilmes
653 $aLangmuir-Blodgett (LB)
653 $aPolímeros condutores
653 $aResposta eletroquímica
653 $asíntese
700 1 $aMATTOSO, L. H. C.
700 1 $aSANTOS JÚNIOR J. R.
700 1 $aGONÇALVES, D.
700 1 $aFARIA, R. M.
700 1 $aOLIVEIRA JÚNIOR, O. N.
773 $tElectrochimica Acta, Elmsford$gv. 40, n. 12, p. 1851-1855, 1995.
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Embrapa Instrumentação (CNPDIA) |
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| 1. |  | SOUZA, H. A. de; MENESES, F. M. N.; ARAGÃO, M. F.; GUEDES, F. L.; SILVA, N. L. da; POMPEU, R. C. F. F. Adubos orgânicos e cobertura morta em atributos do solo e produtividade do estrato herbáceo em área degradada. In: CONGRESSO BRASILEIRO DE CIÊNCIA DO SOLO, 35., 2015, Natal. O solo e suas múltiplas funções: anais. Natal: Sociedade Brasileira de Ciência do Solo, 2015. 5 f.| Tipo: Artigo em Anais de Congresso |
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