引用本文:
张洪林, 闫咏梅, 孔哲. 非水胶束溶液中醇对CMC和热力学性质影响的量热法[J]. 应用化学,
2007, 24(5): 599-601.
Citation: ZHANG Hong-Lin, YAN Yong-Mei, KONG Zhe. Microcalorimetric Study of Influence of Alcohols on Critical Micelle Concentration and Thermodynamic Property of Non-Aqueous Micelle Solutions[J]. Chinese Journal of Applied Chemistry, 2007, 24(5): 599-601.
Citation: ZHANG Hong-Lin, YAN Yong-Mei, KONG Zhe. Microcalorimetric Study of Influence of Alcohols on Critical Micelle Concentration and Thermodynamic Property of Non-Aqueous Micelle Solutions[J]. Chinese Journal of Applied Chemistry, 2007, 24(5): 599-601.
非水胶束溶液中醇对CMC和热力学性质影响的量热法
摘要:
利用微量量热仪测定了十二烷酸钠在N,N-二甲基乙酰胺溶液及助表面活性剂(庚醇、辛醇、壬醇、癸醇)存在时,胶束形成过程的热功率-时间曲线。借助热力学理论,测得了临界胶束浓度(CMC)和胶束形成热(ΔHmθ),计算了ΔGmθ和ΔSmθ。讨论了醇中碳原子数、醇的浓度与CMC和热力学性质之间的关系。结果表明,对十二烷酸钠的N,N-二甲基乙酰胺溶液,在相同温度及相同浓度的醇体系中,CMC值随着醇中碳原子数的增加而降低。在相同温度及相同醇的体系中,CMC值随着醇浓度的增加而增加。胶束形成过程是放热过程,在相同温度及相同浓度的醇体系中,随着醇中碳原子数的增加而放热增加,在相同温度及相同醇的体系中,随着醇浓度的增加而放热增加。
English
Microcalorimetric Study of Influence of Alcohols on Critical Micelle Concentration and Thermodynamic Property of Non-Aqueous Micelle Solutions
Abstract:
The power-time curves of the micelle formation process were determined with microcalorimetry for sodium laurate sdution in N,N-dimehyl acetamide containing cosurfactant (heptanol,octanol,nonanol and decanol).The critical micelle concentration (CMC) and ΔHmθ were measured,and ΔGmθ and ΔSmθ were calculated.The relationship between the carbon number of the alcohol,the alcohol concentration and the thermodynamic properties (CMC,ΔHmθ,ΔGmθ and ΔSmθ) were discussed.For the N,N-dimethyl acetamide solution of sodium laurate,the CMC decreased with the increase of the carbon number of the alcohol,and increased with the increase of the alcohol concentration.The micelle formation process is an exothermic process,and -ΔHmθ increased with the increase of the carbon number of the alcohol,and the alcohol concentration.
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