Self-association of n -hexyltrimethyl-ammonium bromide in aqueous electrolyte solution |
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| Authors: | J M Ruso David Attwood P Taboada V Mosquera |
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| Institution: | (1) Grupo de Física de Coloides y Polímeros Departamento de Física Aplicada y Departamento de Física de la Materia Condensada, Facultad de Física Universidad de Santiago de Compostela 15706 Santiago de Compostela, Spain, ES;(2) School of Pharmacy and Pharmaceutical Sciences, University of Manchester Manchester M13 9PL, UK e-mail: david.attwood@man.ac.uk Tel.: +44-161-2752328 Fax: +44-161-2752396, GB |
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| Abstract: | The self-association of n-hexyltrimethylammonium bromide (C6TAB) in aqueous solution has been studied by static and dynamic light scattering and NMR spectroscopy at 25 °C in the presence
of added electrolyte, and critical aggregation concentrations, aggregation numbers and the degree of ionization have been
calculated. Aggregation numbers determined from light scattering and from the application of mass-action theory to the concentration
dependence of 1H NMR chemical shifts of four protons along the alkyl chain of C6TAB, were between three and four over the range of electrolyte concentration studied (0.2–0.7 molkg−1 NaBr). A structure for the small aggregates has been proposed from the NMR chemical shift data.
Received: 4 June 2001 Accepted: 17 September 2001 |
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| Keywords: | n-Hexyltrimethyl ammonium bromide Micelles Electrolyte effect on self-association |
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