Colloid and Polymer Science

, Volume 278, Issue 8, pp 800–804

The interaction between n-alkyl trimethylammonium bromides with poly(l-aspartate): a thermodynamics study

  • J. M. Ruso
  • F. Sarmiento

DOI: 10.1007/s003960000343

Cite this article as:
Ruso, J. & Sarmiento, F. Colloid Polym Sci (2000) 278: 800. doi:10.1007/s003960000343


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 CnTAB 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.

Key wordsn-Alkyl trimethylammonium bromides Specific conductivity Poly(l-aspartate) Gibbs free energy of adsorption 

Copyright information

© Springer-Verlag Berlin Heidelberg 2000

Authors and Affiliations

  • J. M. Ruso
    • 1
  • F. Sarmiento
    • 1
  1. 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: Tel.: +34-981-563100 Fax: +34-981-520676ES

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