The interaction between n-alkyl trimethylammonium bromides with poly(l-aspartate): a thermodynamics study |
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Authors: | J. M. Ruso F. Sarmiento |
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Affiliation: | (1) Grupo de Física de Coloides y Polímeros Departamento de Física Aplicada Facultad de Física Universidad de Santiago de Compostela 15706 Santiago de Compostela Spain e-mail: fsarmi@usc.es Tel.: +34-981-563100 Fax: +34-981-520676, ES |
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Abstract: | Specific conductivities of a homologous series of n-alkyl trimethylammonium bromides (C8,C10,C12 and C14TABs) in the presence of poly(l-aspartate) in glycine buffer at pH 3.2 and 25 ∘C have been measured over a range of C n TAB concentrations. From the conductivity changes, the number of surfactant molecules absorbed onto the polymer, the Gibbs free energies of adsorption and the equilibrium constants have been calculated. A statistical thermodynamics analysis was used to obtain the Gibbs free energies of adsorption. The results obtained using both methods are compared and analysed. Received: 15 December 1999 Revised form: 29 February 2000 Accepted: 3 March 2000 |
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Keywords: | n-Alkyl trimethylammonium bromides Specific conductivity Poly(l-aspartate) Gibbs free energy of adsorption |
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