Critical behaviour of { water + n-nonane + sodium di(2-ethyl-1-hexyl)sulphosuccinate } microemulsions
Critical behaviour of { water + n-nonane + sodium di(2-ethyl-1-hexyl)sulphosuccinate } microemulsions
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DOI：
10.1006/jcht.2002.0985
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发表时间：
2002-07
期刊：
影响因子：
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通讯作者：
X. An;You-guo Huang;W. Shen
中科院分区：
文献类型：
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作者：
X. An;You-guo Huang;W. Shen
摘要 {水 + n-壬烷 + 钠三元微乳液体系的 ( T , n )、( T , Φ ) 和 ( T , ψ ) 共存曲线，其中 n 、 Φ 和 ψ 分别为折射率、体积分数和有效体积分数 ψ = Φ / { Φ + [(1 − Φ ) Φ c / (1 − Φ c )]}通过在恒压和水与二(2-乙基-1-己基)磺基琥珀酸钠的恒定摩尔比下测量折射率，在高于临界温度8.7 K的温度下测定了二(2-乙基-1-己基)磺基琥珀酸酯}。从 ( T , n )、( T , phi ) 和 ( T , Ψ ) 共存曲线推导出的临界指数 β 与在所有离子水溶液中观察到的非单调交叉一致。由实验数据推导出的β值在T c 以上1 K范围内与三维类伊辛系统的普适类一致。共存曲线已通过韦格纳展开式和直线直径的组合来解释。目前的结果表明，我们最近提出的临界振幅的摩尔质量依赖性对于微乳液体系是有效的。
Abstract Coexistence curves of ( T , n ), ( T , ϕ ), and ( T , Ψ ), where n , ϕ , and Ψ are the refractive index, volume fraction and effective volume fraction ψ = ϕ / { ϕ + [(1 − ϕ ) ϕ c / (1 − ϕ c )]}, respectively, for ternary microemulsion systems of {water + n -nonane + sodium di(2-ethyl-1-hexyl)sulphosuccinate} have been determined at temperatures within 8.7 K above the critical temperature by measurements of refractive index at constant pressure and a constant molar ratio of water to sodium di(2-ethyl-1-hexyl)sulphosuccinate. The critical exponent β deduced from ( T , n ), ( T , ϕ ), and ( T , Ψ ) coexistence curves was found consistent with nonmonotonic crossover observed in all aqueous ionic solutions. The values of β deduced from the experimental data in the range of 1 K above T c were consistent with the universality class of three-dimensional Ising-like systems. The coexistence curves have been interpreted by a combination of the Wegner expansion and the rectilinear diameter. The present results indicate that the molar mass dependence of critical amplitudes, we proposed recently, is valid for microemulsion systems.