Salabat Alireza, Eastoe Julian, Mutch Kevin J, Tabor Rico F
Chemistry Department, Arak University, P.O. Box 38156-879, Arak, Iran.
J Colloid Interface Sci. 2008 Feb 15;318(2):244-51. doi: 10.1016/j.jcis.2007.10.050. Epub 2007 Nov 12.
The effect of solvent on stability of water-in-oil microemulsions has been studied with AOT (sodium bis(2-ethylhexyl)sulfosuccinate) and different solvent mixtures of n-heptane, toluene and dodecane. Dynamic light scattering DLS was used to monitor the apparent diffusion coefficient D(A) and effective microemulsion droplet diameter on changing composition of the solvent. Interdroplet attractive interactions, as indicated by variations in D(A), can be tuned by formulation of appropriate solvent mixtures using heptane, toluene, and dodecane. In extreme cases, solvent mixtures can be used to induce phase transitions in the microemulsions. Aggregation and stability of model AOT-stabilized silica nanoparticles in different solvents were also investigated to explore further these solvent effects. For both systems the state of aggregation can be correlated with the effective molecular volume of the solvent V(mol)(eff) mixture.
已使用AOT（二（2-乙基己基）磺基琥珀酸钠）以及正庚烷、甲苯和十二烷的不同溶剂混合物，研究了溶剂对油包水微乳液稳定性的影响。使用动态光散射（DLS）来监测表观扩散系数D(A)以及在改变溶剂组成时微乳液液滴的有效直径。如D(A)的变化所示，液滴间的吸引相互作用可通过使用庚烷、甲苯和十二烷配制合适的溶剂混合物来调节。在极端情况下，溶剂混合物可用于诱导微乳液中的相变。还研究了模型AOT稳定的二氧化硅纳米颗粒在不同溶剂中的聚集和稳定性，以进一步探索这些溶剂效应。对于这两个体系，聚集状态都可与溶剂混合物的有效分子体积V(mol)(eff)相关联。
