详细信息

DMA/AOT摩尔比对非水微乳体系临界现象的影响  ( SCI-EXPANDED收录)  

Effects of DMA/AOT Molar Ratio on Critical Behavior of Nonaqueous Microemulsion

文献类型:期刊文献

中文题名:DMA/AOT摩尔比对非水微乳体系临界现象的影响

英文题名:Effects of DMA/AOT Molar Ratio on Critical Behavior of Nonaqueous Microemulsion

作者:蔡红兰[1];安学勤[2,3];朱银燕[3];吕辉鸿[3];沈伟国[2]

机构:[1]鲁东大学化学与材料科学学院,烟台264025;[2]华东理工大学化学与分子工程学院,上海200237;[3]江苏省生物功能材料重点实验室,南京210097

年份:2009

卷号:25

期号:5

起止页码:911

中文期刊名:物理化学学报

外文期刊名:Acta Physico-Chimica Sinica

收录:CSTPCD;;Scopus;WOS:【SCI-EXPANDED(收录号:WOS:000266221400016)】;北大核心:【北大核心2008】;CSCD:【CSCD2011_2012】;PubMed;

基金:国家自然科学基金(20573056;20673059;20603030);上海市纳米技术专项(0652nm010);上海基础重点研究项目(08jc1408100);山东省鲁东大学青年基金(LY20082901)资助

语种:中文

中文关键词:微乳液;临界现象;共存曲线;AOT

外文关键词:Microemulsion; Critical phenomena; Coexistence curve; AOT

摘要:采用折射率法测定了非水微乳体系{N,N-二甲基乙酰胺(DMA)/二(2-乙基己基)琥珀酸酯磺酸钠(AOT)/正辛烷}在不同DMA与AOT摩尔比ωs时的温度-折射率(T-n)共存曲线,并根据曲线推导出临界指数β和指前因子B.结果表明,临界组成准c(即DMA和AOT的体积之和在总体积中所占的分数)随ωs的增加而降低,而临界温度Tc随ωs增加而增大;临界指数β与ωs无关,其数值趋近于Fisher重整化理论值(0.365);与体系有关的指前因子B随ωs的增加而增大.
Coexistence curves of (T-n) (T and n are temperature and refractive index, respectively) for {N,N- dimethylaccetamide(DMA)/sodium bis(2-ethylhexyl)sulfosuccinate(AOT)/n-octane} nonaqueous microemulsion systems with various molar ratios ωs of DMA to AOT have been determined by the measurement of refractive index. Critical exponents (β) and critical amplitudes (B) were deduced from coexistence curves of (T-n). Results show that the critical volume fraction φc {i.e. φ=(VAOT+VDMA)/(VAOT+VDMA+Vn-octane)} increases as ωs decreases, but the critical temperature Tc increases with the increase in ωs. Value of the critical exponent β is independent of ωs and approaches 0.365, which is consistent with the Fisher-renormalization group theory. System-dependence amplitudes (B) increase almost linearly with the increase in ωs.

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