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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: |
MATTOSO, L. H. C.; PATERNO, L. G.; CAMPANA, S. P.; OLIVEIRA JUNIOR, O. N. |
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Afiliação: |
EMBRAPA-CNPDIA; USP-IQSC; USP-IFSC. |
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Título: |
Effect of pH on the adsorption kinetics of self-assembled films from doped poly(o-ethoxyaniline). |
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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.356. |
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Idioma: |
Inglês |
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Notas: |
Ref.P3.102. |
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Conteúdo: |
The adsorption process of alternated, yltra-thin films of carboxymethylcellulose and HCI-doped poly(o-ethoxyaniline) onto glass substrates by the self-assembly technique was studied by ultraviolet-visible spectroscopy. The kinetics of adsorption for the 1st, 2nd, 5th and 10th bilayers obeys a first order process for a polymer concentration of 10E-3 M, with characteristic times in the order of 100s, independently of the solution pH in the range 1 to 5. This result is in contrast with data obtained for higher polymer concentrations where adsorption comprised two stages: a fast, first order kinetics process (characteristic time of only 5s) followed by a much slower process. It was also observed that adsorption is faster and more effective for pH=1. This probably occurs because at lower pHs the polymer is more strongly doped which promotes an increase in the electrostatic attraction of the polymeric molecules to the substrate. |
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Categoria do assunto: |
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Marc: |
LEADER 01580naa a2200181 a 4500
001 1027114
005 1999-12-22
008 1996 bl uuuu u00u1 u #d
100 1 $aMATTOSO, L. H. C.
245 $aEffect of pH on the adsorption kinetics of self-assembled films from doped poly(o-ethoxyaniline).
260 $c1996
300 $ap.356.
500 $aRef.P3.102.
520 $aThe adsorption process of alternated, yltra-thin films of carboxymethylcellulose and HCI-doped poly(o-ethoxyaniline) onto glass substrates by the self-assembly technique was studied by ultraviolet-visible spectroscopy. The kinetics of adsorption for the 1st, 2nd, 5th and 10th bilayers obeys a first order process for a polymer concentration of 10E-3 M, with characteristic times in the order of 100s, independently of the solution pH in the range 1 to 5. This result is in contrast with data obtained for higher polymer concentrations where adsorption comprised two stages: a fast, first order kinetics process (characteristic time of only 5s) followed by a much slower process. It was also observed that adsorption is faster and more effective for pH=1. This probably occurs because at lower pHs the polymer is more strongly doped which promotes an increase in the electrostatic attraction of the polymeric molecules to the substrate.
700 1 $aPATERNO, L. G.
700 1 $aCAMPANA, S. P.
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 : 88 | |
| 22. |  | OLIVEIRA JÚNIOR, O. N.; ZUCOLOTTO, V.; FERREIRA, M.; MATTOSO, L. H. C.; RIUL JÚNIOR, A. Nanostructured films employed in sensors. In: SUPRAMOLECULAR ENGINEERING OF CONDUCTING MATERIALS, 2005, Safety Harbor, USA. Capítulo de livro. Safety Harbor, USA: Fractal System, 2005.| Biblioteca(s): Embrapa Instrumentação. |
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| 23. | | MELLO, S. V.; MATTOSO, L. H. C.; OLIVEIRA JUNIOR, O. N.; FARIA, R. M. Processibility of poly(o-ethoxyaniline) via the Langmuir-Blodgett technique. In: INTERNATIONAL CONFERENCE ON ORGANIZED MOLECULAR FILMS, 7., Sept. 1995, Numana, Ancona, Italia. Abstract book... [S.l.: s.n.], 1995. p.33. Ref.P-1.97.| Biblioteca(s): Embrapa Instrumentação. |
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| 26. | | PATERNO, L. G.; CONSTANTINO, C. L.; OLIVEIRA JUNIOR, O. N.; MATTOSO, L. H. C. Self-assembled films of polyanilines complexed with polyions. In: INTERNATIONAL CONFERENCE ON ORGANIZED MOLECULAR FILMS, 9., 2000, Potsdam. Programme and abstracts? Golm: Max Planck Institute of Colloids and Interfaces; Potsdam: University Potsdam, 2000. v. 1, p. 226, ref. T 163.| Biblioteca(s): Embrapa Instrumentação. |
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| 27. | | RIUL JUNIOR, A.; DHANABALAN, A.; MATTOSO, L. H. C.; SOUZA, L. M. de; TICIANELLI, E. A.; OLIVEIRA JUNIOR, O. N. Characterization of 16-MER polyaniline composite LB films. In: INTERNATIONAL CONFERENCE ON ORGANIZED MOLECULAR FILMS, 8., aug. 1997, Asilomar, CA, USA. Abstract & program booklet... Davis: University of California, 1997. não paginado. Ref: 7-P-28.| Biblioteca(s): Embrapa Instrumentação. |
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| 28. | | RIUL JUNIOR, A.; OLIVEIRA JUNIOR, O. N.; TELLES, G. D.; MATTOSO, L. H. C.; FARIA, R. M. Characterization of Langmuir-Blodgett films of parent polyaniline. In: INTERNATIONAL CONFERENCE ON ORGANIZED MOLECULAR FILMS, 7., Sept. 1995, Numana, Ancona, Italia. Abstract book... [S.l.: s.n.], 1995. p.33. Ref.P-1.99.| Biblioteca(s): Embrapa Instrumentação. |
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| 32. | | LEITE, F. L.; MANZOLI, A.; ALVES, W. F.; HERRMANN P. S. P.; MATTOSO, L. H. C.; OLIVEIRA JUNIOR, O. N. Estimation of molecular weight and polydispersity in conducting polymers using single-molecule force spectroscopy. In: ENCONTRO DA SOCIEDADE BRASILEIRA DE PESQUISA EM MATERIAIS - SBPMat, 7., 2008, Guarujá; BRAZILIAN MRS MEETING, 7., 2008, Guarujá. Abstracts... Rio de Janeiro: SBPMat, 2008. não paginado. 1CD-ROM. Entrada padronizada: HERRMANN JUNIOR, P. S. de P.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Instrumentação. |
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| 33. | | TELLES, G. D; RIUL JUNIOR, A.; MELLO, S. V.; OLIVEIRA JUNIOR, O. N.; MATTOSO, L. H. C. Medidas de condutividade em filmes polimericos ultrafinos. In: ENCONTRO NACIONAL DE FISICA DA MATERIA CONDENSADA, 18., jun. 1995, Caxambu, MG. 1995. Resumos... Sao Paulo: Sociedade Brasileira de Fisica, 1995. p.272.| Biblioteca(s): Embrapa Instrumentação. |
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| 35. | | MATTOSO, L. H. C.; MELLO, S. V.; RIUL JÚNIOR, A.; TELLES, G. D.; OLIVEIRA JÚNIOR, O. N. Langmuir and Langmuir-blodgett films of parent polyaniline doped with functionalized acids. In: INTERNATIONAL CONFERENCE ON SCIENCE AND TECHONOLOGY OF SYNTHETIC METALS, jul. 1994, Seoul, Korea. Abstracts... Seoul, Korea: The Organizing Committee of ICSM '94, 1994. Ref. THR P83. 524| Biblioteca(s): Embrapa Instrumentação. |
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| 37. | | MELLO, S. V.; MATTOSO, L. H. C.; SANTOS JÚNIOR J. R.; GONÇALVES, D.; FARIA, R. M.; OLIVEIRA JÚNIOR, O. N. Electrochemical response of poly(o-ethoxyaniline) films produced by different techniques. Electrochimica Acta, Elmsford, v. 40, n. 12, p. 1851-1855, 1995.| Biblioteca(s): Embrapa Instrumentação. |
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| 38. | | BORATO, C. E.; HERRMANN, P. S. P.; COLNAGO, L. A.; OLIVEIRA JUNIOR, O. N.; MATTOSO, L. H. C. Influência do pH na cinética de formação de filmes ultrafinos automontados de lisozima. In: REUNIAO ANUAL DA SOCIEDADE BRASILEIRA DE QUIMICA, 19.; SIMPOSIO NACIONAL DE QUIMICA INORGANICA, 8., maio 1996, Pocos de Caldas, MG. Livro de resumos... Sao Paulo: Sociedade Brasileira de Quimica, 1996. FQ-032.| Biblioteca(s): Embrapa Instrumentação. |
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| 39. | | MELLO, S. V.; RIUL JUNIOR, A.; MATTOSO, L. H. C.; FARIA, R. M.; OLIVEIRA JUNIOR, O. N. Protonation effects in polyaniline Langmuir films investigated by surface potential measurements. In: INTERNATIONAL CONFERENCE ON SCIENCE AND TECHNOLOGY OF SYNTHETIC METALS, July-Aug. 1996, Snowbird, UT, Estados Unidos. Abstracts... Snowbird: Utah University, 1996. p.204. Ref.P2.164.| Biblioteca(s): Embrapa Instrumentação. |
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| 40. | | FERREIRA, E. J.; PEREIRA, R. C. T.; DELBEM, A. C. B.; OLIVEIRA JUNIOR, O. N.; MATTOSO, L. H. C. Random subspace method for analysing cofee with electronic tongue. Electronics Letters, London, v. 43, n. 21, p. 1138-1139, 2007.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: Internacional - A |
| Biblioteca(s): Embrapa Instrumentação. |
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| Registros recuperados : 88 | |
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| Nenhum registro encontrado para a expressão de busca informada. |
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