The Effect of Temperature on the Heats of Solution and Micelle Formation of Sodium Dodecyl Sulfate

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概要

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• For the elucidation of molecular behaviors of surfactant solutions from the view-point of thermodynamic parameters, the standard heats of solution and micelle formation per mole of sodium dodecyl sulfate (NaDS), typical anionic surfactant, or ΔH°_sol and ΔH°_m were determined by calorimetry in the wide range of temperature from 20° to 45°, with parallel experiments determining critical micelle concentration by conductivity measurement and degree of Na+ ion dissociation on micelle by electromotive force measurement using Na+ ion responsive electrode. From the values of both the standard heats, the standard enthalpies of NaDS in monomeric and micellar states, H°_mono and H°_mie, were calculated on the relative base of standard enthalpy of solid state. The change of these values with temperature gave ca. 120 and 16 cal deg^<-1> mole^<-1> to the increases of the standard partial molar heat capacity of NaDS on transferring from solid state to monomeric and micellar states, i.e. ΔC°_p (solid→mono, NaDS) and ΔC°_p (solid→mic, NaDS), respectively. By applying a simple additivity rule, it was concluded that the change of heat capacity of the paraffin portion of NaDS plays an important role in the above-mentioned ΔC°_ps, implying the formation of hydrophobic interaction between the paraffin portion and water. With other experimental data, also the systematic description of surfactant solution was done in thermodymanic terms.

• 公益社団法人日本薬学会の論文
• 1974-05-25

著者

• 岸本 博

  Faculty Of Pharmaceutical Sciences Nagoya City University

• 住田 国治

  Faculty of Pharmaceutical Sciences, Nagoya City University

• 住田 国治

  Faculty Of Pharmaceutical Sciences Nagoya City University

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• ドテシル硫酸ナトリウムと非イオン性高分子との水溶液中における結合熱
• The Effect of Temperature on the Heats of Solution and Micelle Formation of Sodium Dodecyl Sulfate

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