Colloid and Polymer Science

, 289:1597 | Cite as

Thermodynamic and NMR study of aggregation of dodecyltrimethylammonium chloride in aqueous sodium salicylate solution

  • Bojan Šarac
  • Janez Cerkovnik
  • Bernard Ancian
  • Guillaume Mériguet
  • Gaëlle M. Roger
  • Serge Durand-Vidal
  • Marija Bešter-Rogač
Original Contribution

Abstract

The complex aggregation processes of dodecyltrimethylammonium chloride (DTAC) have been studied in dilute solutions of sodium salicylate (NaSal) by isothermal titration calorimetry and electrical conductivity at temperatures between 278.15 K and 318.15 K. A structural transformation that was dependent on the concentrations of DTAC and NaSal was observed. The micellization process in dilute solutions of DTAC has been subjected to a detailed thermodynamic analysis and shown to occur at considerably lower critical micelle concentrations than reported for DTAC in water and NaCl solutions. Gibbs free energy, ΔmicGo, and entropy, ΔmicSo, were deduced by taking into account the degree of micelle ionization, β, estimated from conductivity measurements. From the temperature dependence of the enthalpy of micellization, ΔmicHo, the heat capacities of micellization, \( {\Delta_{{{\rm mic} }}}c_p^o \) were determined and discussed in terms of the removal of large areas of non-polar surface from contact with water upon micellization. The process is exothermic at all temperatures, indicating, in addition to the hydrophobic effect, the presence of strong interactions between surfactant and salicylate ions. These were confirmed by 1H NMR spectroscopy and diffusion NMR experiments. Salicylate ions not only interact with the headgroups but also insert further into the micelle core. At cNaSal/cDTAC > 2.5, the structural rearrangements occur even at relatively low concentrations of NaSal.

Keywords

Dodecyltrimethylammonium chloride Sodium salicylate Micellization Thermodynamics Electrical conductivity Isothermal titration calorimetry NMR self-diffusion 

Supplementary material

396_2011_2480_MOESM1_ESM.doc (799 kb)
ESM 1(DOC 799 kb)

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Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  • Bojan Šarac
    • 1
  • Janez Cerkovnik
    • 1
  • Bernard Ancian
    • 2
  • Guillaume Mériguet
    • 2
  • Gaëlle M. Roger
    • 3
  • Serge Durand-Vidal
    • 2
  • Marija Bešter-Rogač
    • 1
  1. 1.Faculty of Chemistry and Chemical Technology, Aškerčeva 5University of LjubljanaLjubljanaSlovenia
  2. 2.UPMC Univ Paris 6–Laboratoire PECSA (UPMC–CNRS–ESPCI)ParisFrance
  3. 3.ANDRA, Parc de la Croix BlancheChâtenay-Malabry CedexFrance

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