Phase Separation and Liquid Crystal Self-Assembly in Surfactant−Inorganic−Solvent Systems
Phase Separation and Liquid Crystal Self-Assembly in Surfactant−Inorganic−Solvent Systems
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DOI：
10.1021/la026410d
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发表时间：
2003-02
期刊：
影响因子：
3.9
通讯作者：
Flor R. Siperstein and;K. Gubbins
中科院分区：
文献类型：
--
作者：
Flor R. Siperstein and;K. Gubbins
表面活性剂-无机氧化物-溶剂系统的行为进行了研究，使用晶格Monte Carlo模拟。在无无机缩合条件下，这些体系相分离成主要含有表面活性剂和无机氧化物的液晶相，与富溶剂相平衡。在所研究的体系中，溶剂和无机氧化物与表面活性剂头部具有有利的相互作用，但无机氧化物-表面活性剂相互作用比溶剂-表面活性剂相互作用更强，这导致相分离，而不管氧化物-溶剂的可溶解性如何。在含有高浓度表面活性剂的相中观察到有序液晶相的形成，并且该相的结构取决于系统组成和相互作用的强度。在不同条件下形成的六方和层状结构与表面活性剂-二氧化硅液晶的形成和合成的实验证据定性一致。
The behavior of surfactant−inorganic oxide−solvent systems is studied using lattice Monte Carlo simulations. Under no inorganic condensation conditions, these systems phase separate into a liquid crystal phase that contains mainly surfactant and inorganic oxide, in equilibrium with a solvent-rich phase. In the systems studied, the solvent and the inorganic oxide have favorable interactions with the surfactant head, but the inorganic oxide−surfactant interactions are stronger than the solvent−surfactant interactions, which leads to a phase separation, regardless of the oxide−solvent miscibility. The formation of ordered liquid crystal phases is observed in the phase containing a high surfactant concentration, and the structure of this phase depends on the system composition and strength of the interactions. The formation of hexagonal and lamellar structures at different conditions is in qualitative agreement with experimental evidence on the formation of surfactant−silica liquid crystals and the synthesis ...