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Thermally-induced Transition in Aqueous Solution of Cationic Surfactant Containing Aromatic Ring

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Abstract

Heat capacities of aqueous solutions of cetyltrimethylammonium (CTA) salicylate, of CTA m-hydroxybenzoate and of CTA p-hydroxybenzoate were measured using a scanning microcalorimeter. Only the salicylate solution exhibited heat-capacity anomaly around 330 K, depending on the heating rate. The transition enthalpy was 3.5±0.2 kJ mol−1, which was similar to that observed in solution of 1:1 intermolecular compound between CTA bromide (CTAB) and o-iodophenol (OIPh). The enthalpy of formation ΔHf of the 1:1 intermolecular compound from CTAB and OIPh was determined by measuring the enthalpies of solution of the relevant crystals into ethanol. Positive value ΔfH=3.0±0.3 kJ mol−1 was explained from a large difference between the heat capacities of the 1:1 compound and 1:1 mixture of the component crystals.

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Authors and Affiliations

  1. Research Institute for Science and Technology, Kinki University, Kowakae, Higashi-Osaka, 577-8502, Japan

    Kei-ichi Endoh & H. Suga

  2. Laboratory of Biophysical Chemistry, College of Agriculture, University of Osaka Prefecture, Sakai, Osaka, 599-8231, Japan

    H. Fukada

Authors
  1. Kei-ichi Endoh
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  2. H. Suga
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  3. H. Fukada
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Endoh, Ki., Suga, H. & Fukada, H. Thermally-induced Transition in Aqueous Solution of Cationic Surfactant Containing Aromatic Ring. Journal of Thermal Analysis and Calorimetry 57, 669–678 (1999). https://doi.org/10.1023/A:1010168010761

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  • DOI: https://doi.org/10.1023/A:1010168010761

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