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(ΔHθm),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。
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 △H^θm were measured, and △G^θm and △S^θm were calculated. The relationship between the carbon number of the alcohol, the alcohol concentration and the thermodynamic properties（CMC, △H^θm,△G^θm and △S^θm） 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 -△H^θm increased with the increase of the carbon number of the alcohol, and the alcohol concentration.
出处
《应用化学》
CAS
CSCD
北大核心
2007年第5期599-601,共3页
Chinese Journal of Applied Chemistry
基金
山东省自然科学基金资助(Y2006B13)
关键词
十二烷酸钠
醇类
非水溶液
CMC
热力学函数
微量量热法
sodium laurate, alcohol, non-aqueous solution, critical micelle concentration, thermodynamic function, microcalorimetric method
