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Registro Completo |
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Biblioteca(s): |
Epagri-Sede. |
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Data corrente: |
18/04/2011 |
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Data da última atualização: |
18/04/2011 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
DAL BO, A.; SCHVEITZER, B.; FELIPPE, A. C.; ZANETTE, D.; LINDMAN, B. |
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Afiliação: |
Epagri |
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Título: |
Ethyl (hydroxyethyl) cellulose-sodium dodecanoate interaction investigated by surface tension and electrical conductivity techniques. |
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Ano de publicação: |
2005 |
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Fonte/Imprenta: |
Colloids and Surfaces A Physicochemical and Engineering Aspects, EUA, v. 256, p. 171-180, 2005. |
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Idioma: |
Inglês |
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Notas: |
ISSN, 09277757 |
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Conteúdo: |
Mixtures of ethyl(hydroxyethyl)cellulose (EHEC) and sodium dodecanoate (SDoD) were investigated using surface tension, conductivity and transmittance measurements. The parameters of the surfactant to polymer association processes such as the critical aggregation concentration (cac) and saturation of the polymer by SDoD (psp) were determined from the plots of surface tension and specific conductivity versus surfactant concentration. The transmittance versus [SDoD] profiles exhibited bands that, in conjunction with conductivity and surface tension data, gave support to the explanation of the behavior of EHEC?SDoD?water solutions. Transmittance bands determined in the presence of EHEC and surfactant are sensitive to the process of surfactant to polymer binding. In this process, a discontinuity point represented by a second broader peak in the transmittance plots was identified, implying a slight inhibition of the breakdown of the network process. This is explained as a kind of intermediate re-structural network of the complexes produced by the formation of regular SDoD micelles. It was demonstrated that the second conductivity breakpoint marks the polymer saturation by surfactant clusters, and the effect of the EHEC concentration on the process of binding can be described by a linear correlation when the psp breakpoint is plotted against the polymer concentration. |
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Palavras-Chave: |
Electrical conductivity; Surface tension Ethylhydroxyethylcellulose. |
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Categoria do assunto: |
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Marc: |
LEADER 01958naa a2200157 a 4500
001 1075775
005 2011-04-18
008 2005 bl uuuu u00u1 u #d
100 1 $aEpagri
245 $aEthyl (hydroxyethyl) cellulose-sodium dodecanoate interaction investigated by surface tension and electrical conductivity techniques.
260 $c2005
500 $aISSN, 09277757
520 $aMixtures of ethyl(hydroxyethyl)cellulose (EHEC) and sodium dodecanoate (SDoD) were investigated using surface tension, conductivity and transmittance measurements. The parameters of the surfactant to polymer association processes such as the critical aggregation concentration (cac) and saturation of the polymer by SDoD (psp) were determined from the plots of surface tension and specific conductivity versus surfactant concentration. The transmittance versus [SDoD] profiles exhibited bands that, in conjunction with conductivity and surface tension data, gave support to the explanation of the behavior of EHEC?SDoD?water solutions. Transmittance bands determined in the presence of EHEC and surfactant are sensitive to the process of surfactant to polymer binding. In this process, a discontinuity point represented by a second broader peak in the transmittance plots was identified, implying a slight inhibition of the breakdown of the network process. This is explained as a kind of intermediate re-structural network of the complexes produced by the formation of regular SDoD micelles. It was demonstrated that the second conductivity breakpoint marks the polymer saturation by surfactant clusters, and the effect of the EHEC concentration on the process of binding can be described by a linear correlation when the psp breakpoint is plotted against the polymer concentration.
653 $aElectrical conductivity
653 $aSurface tension Ethylhydroxyethylcellulose
773 $tColloids and Surfaces A Physicochemical and Engineering Aspects, EUA$gv. 256, p. 171-180, 2005.
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| 1. |  | DAL BO, A.; SCHVEITZER, B.; FELIPPE, A. C.; ZANETTE, D.; LINDMAN, B. Ethyl (hydroxyethyl) cellulose-sodium dodecanoate interaction investigated by surface tension and electrical conductivity techniques. Colloids and Surfaces A Physicochemical and Engineering Aspects, EUA, v. 256, p. 171-180, 2005. ISSN, 09277757| Tipo: Artigo em Periódico Indexado | Circulação/Nível: -- - -- |
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