十六烷基三甲基溴化铵在N,N二甲基乙酰胺/长链醇体系中临界胶束浓度和热力学函数的微量量热法研究 |
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引用本文: | 朱跃,张可,侯婷婷,刘海莹,崔茂金,张洪林,李干佐,于丽.十六烷基三甲基溴化铵在N,N二甲基乙酰胺/长链醇体系中临界胶束浓度和热力学函数的微量量热法研究[J].化学学报,2009,67(20):2309-2314. |
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作者姓名: | 朱跃 张可 侯婷婷 刘海莹 崔茂金 张洪林 李干佐 于丽 |
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作者单位: | 1. 曲阜师范大学化学科学学院,曲阜,273165 2. 山东大学胶体与界面化学教育部重点实验室,济南,250100 |
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基金项目: | 国家自然科学基金和山东省自然科学基金资助项目;国家级.国家自然科学基金 |
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摘 要: | 用微量量热法测定了阳离子表面活性剂十六烷基三甲基溴化铵(CTAB)在非水溶剂N,N二甲基乙酰胺(DMA)中,分别加入长链醇(正庚醇、正辛醇、正壬醇、正癸醇)体系的热功率一时间曲线,由测得的曲线上的数据得到了临界胶束浓度(CMC)和形成热(ΔHθm).根据热力学理论,计算了热力学函数(ΔGθm,ΔSθm),讨论了温度、醇中的碳原子数、醇的浓度与临界胶束浓度(CMC)和热力学函数之间的关系.结果表明:十六烷基三甲基溴化铵(CTAB)的DMA溶液,在含有相同浓度的各种醇的体系中,CMC,ΔHθm和ΔSθm的值随着温度的升高而增加;而ΔGθm的值随着温度的升高而略有降低.在相同温度及相同浓度的醇体系中,CMC,ΔHθm,ΔGθm和ΔSθm的值都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和ΔGθm的值随着醇的浓度的增加而增加;而ΔHθm和ΔSθm的值随着醇的浓度的增加而减少.
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关 键 词: | 十六烷基三甲基溴化铵(CTAB) N N-二甲基乙酰胺(DMA) 长链醇(庚醇 辛醇 壬醇 癸醇) 临界胶束浓度(CMC) 热力学函数(ΔHθm ΔGθm ΔSθm) 微量量热法 |
收稿时间: | 2008-05-06 |
修稿时间: | 2009-04-16 |
Studies on the CMC and Thermodynamic Functions of Cetyltrimethyl- ammonium Bromide in the N,N-dimethylacetamide/Long-chain Alcohol Systems using Microcalorimetric Method |
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Institution: | ( College of Chemical Science, Qufu Normal University, Qufu 273165) (Key Laboratory for Colloid and Interface Chemistry of Ministry of Education, Shandong University, Jinan 250100) |
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Abstract: | The power~time curves of the micelle formation process were determined by microcalorimetry for cetyltrimethylammonium bromide in N,N-dimehylacetamide containing cosurfactant ( heptanol, octanol, nonanol and decanol). The critical micelle concentration ( CMC) and ΔHθm were measured, and ΔGθm and ΔSθm were calculated. The relationship between the temperature, the carbon number of the alcohol, the alcohol concentration and the thermodynamic properties (CMC, ΔHθm , ΔGθm and ΔSθm ) were discussed. |
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Keywords: | cetyltrimethylammonium bromide N N-dimethylacetamide long-chain alcohol (heptanol octanol nonanol and decanol) critical micelle concentration thermodynamic function microcalorimetric meth |
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