The Effect of Temperature on the Heats of Solution and Micelle Formation of Sodium Dodecyl Sulfate
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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.
収録刊行物
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- CHEMICAL & PHARMACEUTICAL BULLETIN
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CHEMICAL & PHARMACEUTICAL BULLETIN 22 (5), 1108-1118, 1974
公益社団法人 日本薬学会
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詳細情報 詳細情報について
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- CRID
- 1390282679147197824
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- NII論文ID
- 110003654663
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- NII書誌ID
- AA00602100
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- COI
- 1:CAS:528:DyaE2cXkvVagsL0%3D
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- ISSN
- 13475223
- 00092363
- http://id.crossref.org/issn/00092363
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- Crossref
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可