Water-AOT-alkylbenzene microemulsions: influence of alkyl chain length on structure and percolation behavior.

Water-AOT-alkylbenzene microemulsions: influence of alkyl chain length on structure and percolation behavior.
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水-AOT-烷基苯微乳液:烷基链长度对结构和渗滤行为的影响

DOI:
10.1016/j.jcis.2012.02.062
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发表时间:
2012
影响因子:
9.9
通讯作者:
Stühn
Stühn
中科院分区:
化学1区
文献类型:
--
作者:
Stühn

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研究了以甲苯、乙苯、丁苯和辛苯为油相的AOT(琥珀酸双(2-乙基己基)酯磺酸钠)微乳液油包水(W/O)液滴相的渗流行为。我们使用不同组成的微乳液,其中水与表面活性剂的摩尔比为0 × 10 - 3 W × 10 - 50,液滴(水加表面活性剂)体积分数为10% × 10 - 50%。使用介电谱,观察到在w/o微乳液与丁苯或辛苯的逾渗转变。随着烷基苯分子量的增加,渗滤温度TP降低。用小角X射线散射法(SAXS)测定了微乳液的结构。随着烷基苯摩尔质量的增加,L2液滴相的稳定范围扩展到更高的W。较大的量的可溶解的水可以与可变的油渗透的AOT单层,这会影响表面活性剂壳的自发曲率。
We study the percolation behavior of the water-in-oil (w/o) droplet phase of AOT (sodium bis[2-ethylhexyl] sulfosuccinate)-based microemulsions with different alkylbenzenes (toluene, ethylbenzene, butylbenzene or octylbenzene) as oil phase. We use microemulsions of varying composition with molar water to surfactant ratios 0⩽W⩽ 50 and droplet (water plus surfactant) volume fractions 10%⩽ϕ⩽50%. Using dielectric spectroscopy, a percolation transition is observed in w/o microemulsions with butylbenzene or octylbenzene. With increasing molecular weight of the alkylbenzene, the percolation temperature TPdecreases. The structure of the microemulsions is determined by small angle X-ray scattering (SAXS). With increasing molar weight of the alkylbenzene, the stability range of the L2droplet phase extends to higher W. The larger amount of solubilizable water can be related to variable oil penetration of the AOT monolayer, which affects the spontaneous curvature of the surfactant shell.
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