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Hydration of the organized molecular assembly of ionic surfactants as studied by vapor pressure and x-ray diffraction

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Abstract

Equilibrium vapor pressure of water was measured for ionic surfactant-water binary systems as a function of water content over the temperature range 5–11°C. The measurement of x-ray powder diffraction has also been performed to characterize the microscopic structures of these two-component systems. Examined surfactants were the homologs of sodium alkyl sulfate and alkyltrimethylammonium bromide. It was found that dodecyl and decyl sulfate formed solid di-and trihydrate respectively, while octyl sulfate and the cationic surfactants formed lyotropic liquid crystal instead. The x-ray long spacing of the liquid crystals scarcely varied with water content.Enthalpy of vaporization was calculated for both solid hydrates and lyotropic liquid crystals.

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Fukada, K., Matsuzaka, Y., Ito, Y. et al. Hydration of the organized molecular assembly of ionic surfactants as studied by vapor pressure and x-ray diffraction. Colloid Polym Sci 271, 1197–1206 (1993). https://doi.org/10.1007/BF00657077

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Key words

  • Surfactant-water binary system
  • solid hydrate
  • lyotropic liquid crystal
  • vapor pressure
  • x-ray diffraction