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Registro Completo |
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Biblioteca(s): |
Embrapa Instrumentação. |
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Data corrente: |
22/12/1999 |
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Data da última atualização: |
22/12/1999 |
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Autoria: |
MELLO, S. V.; RIUL JUNIOR, A.; MATTOSO, L. H. C.; FARIA, R. M.; OLIVEIRA JUNIOR, O. N. |
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Afiliação: |
USP-IQSC; USP-IFSC; EMBRAPA-CNPDIA. |
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Título: |
Protonation effects in polyaniline Langmuir films investigated by surface potential measurements. |
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Ano de publicação: |
1996 |
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Fonte/Imprenta: |
In: INTERNATIONAL CONFERENCE ON SCIENCE AND TECHNOLOGY OF SYNTHETIC METALS, July-Aug. 1996, Snowbird, UT, Estados Unidos. Abstracts... Snowbird: Utah University, 1996. |
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Páginas: |
p.204. |
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Idioma: |
Inglês |
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Notas: |
Ref.P2.164. |
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Conteúdo: |
Doping parent polyaniline (PAni) and its derivatives has been proven essential by obtaining stable Langmuir monolayers that are amenable to transfer onto solid substrates by the Langmuir-Blodgett (LB) technique. The doping process is generally carried out on the Langmuir trough, by spreading the polymer on an acidic subphase. The degree of doping affects the monolayer surface potential as the positive contribution from the double-layer increases with increasing protonation of the polymer molecules. One could then expect that the surface potential should increase with the acid concentration in the subphase, but instead the potential diminishes for increasing concentration in the range 10E-4 - 10E-1 M. This occurs because the polymer is already probably fully protonated on the 10E-4 M subphase and the double-layer contribution then decreases with the ionic strength. Interestingly, the results have been discussed in terms of the simple Gouy-Chapman theory, despite the complexity of the macromolecules involved. |
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Categoria do assunto: |
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Marc: |
LEADER 01694naa a2200193 a 4500
001 1027116
005 1999-12-22
008 1996 bl uuuu u00u1 u #d
100 1 $aMELLO, S. V.
245 $aProtonation effects in polyaniline Langmuir films investigated by surface potential measurements.
260 $c1996
300 $ap.204.
500 $aRef.P2.164.
520 $aDoping parent polyaniline (PAni) and its derivatives has been proven essential by obtaining stable Langmuir monolayers that are amenable to transfer onto solid substrates by the Langmuir-Blodgett (LB) technique. The doping process is generally carried out on the Langmuir trough, by spreading the polymer on an acidic subphase. The degree of doping affects the monolayer surface potential as the positive contribution from the double-layer increases with increasing protonation of the polymer molecules. One could then expect that the surface potential should increase with the acid concentration in the subphase, but instead the potential diminishes for increasing concentration in the range 10E-4 - 10E-1 M. This occurs because the polymer is already probably fully protonated on the 10E-4 M subphase and the double-layer contribution then decreases with the ionic strength. Interestingly, the results have been discussed in terms of the simple Gouy-Chapman theory, despite the complexity of the macromolecules involved.
700 1 $aRIUL JUNIOR, A.
700 1 $aMATTOSO, L. H. C.
700 1 $aFARIA, R. M.
700 1 $aOLIVEIRA JUNIOR, O. N.
773 $tIn: INTERNATIONAL CONFERENCE ON SCIENCE AND TECHNOLOGY OF SYNTHETIC METALS, July-Aug. 1996, Snowbird, UT, Estados Unidos. Abstracts... Snowbird: Utah University, 1996.
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Registro original: |
Embrapa Instrumentação (CNPDIA) |
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| Registros recuperados : 9 | |
| 6. |  | AGUIAR, M. de J. N.; VIANA, T. V. de A.; AGUIAR, J. V. de; LIMA, J. B. de; CRISOSTOMO JUNIOR, R. R.; AQUINO, F. C. de; BARRETO JUNIOR, J. H. C. Dados climatológicos: Estação de Fortaleza, 2002. Fortaleza: Embrapa Agroindustria Tropical, 2003. 19 p. (Embrapa Agroindustria Tropical. Documentos, 75)| Biblioteca(s): Embrapa Agroindústria Tropical. |
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| 7. | | AGUIAR, M. de J. N; VIANA, T. V. de A; AGUIAR, J. V. de; LIMA, J. B. de; AQUINO, F. C. de; CRISOSTOMO JUNIOR, R. R; BARRETO JUNIOR, J. H. C; CARNEIRO, F. de A. Dados climatologicos: Estaçao de Pentecoste, 2001 Fortaleza: Embrapa Agroindustria Tropical, 2002. (Embrapa Agroindustria Tropical; Documentos, 62)| Biblioteca(s): Embrapa Agroindústria Tropical. |
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| 8. | | AGUIAR, M. de J. N.; VIANA, T. V. de A.; AGUIAR, J. V. de; LIMA, J. B. de; CRISOSTOMO JUNIOR, R. R.; AQUINO, F. C. de; BARRETO JUNIOR, J. H. C. Dados climatológicos: Estação de Pentecoste, 2002. Fortaleza: Embrapa Agroindustria Tropical, 2003. (Embrapa Agroindustria Tropical; Documentos, 76)| Biblioteca(s): Embrapa Agroindústria Tropical. |
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| 9. | | AGUIAR, M. de J. N.; VIANA, T. V. de A.; AGUIAR, J. V. de; LIMA, J. B. de; AQUINO, F. C. de; CRISOSTOMO JUNIOR, R. R.; BARRETO JUNIOR, J. H. C.; CARNEIRO, F. de A. Dados climatologicos: Estaçao de Quixada, 2001 Fortaleza: Embrapa Agroindustria Tropical, 2002. (Embrapa Agroindustria Tropical; Documentos, 63)| Biblioteca(s): Embrapa Agroindústria Tropical. |
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| Registros recuperados : 9 | |
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