Solubilization of oil in a mixed cationic liquid crystal
Solubilization of oil in a mixed cationic liquid crystal
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油在混合阳离子液晶中的溶解
DOI：
10.1007/s003960050364
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发表时间：
1999
影响因子：
2.4
通讯作者：
H. Kunieda
中科院分区：
文献类型：
--
作者：
K. Aramaki;H. Kunieda
二十二烷基二甲基溴化铵（DDAB）在十二烷基三甲基溴化铵+ DDAB中生成层状液晶（Lα）的混合分数在添加少量间二甲苯时突然降低，而在高二甲苯含量时混合分数保持不变。在饱和烃体系中也得到了类似的结果。认为表面活性剂栅栏层中的油分子增加了每个表面活性剂头基的有效横截面积，而如果油分子溶解在液晶核心，则为常数。通过小角x射线散射数据计算侵透油在总溶解油中的体积分数，定义为侵透参数Pe。Pe在二甲苯体系中含量高，在癸烷体系中含量低。即使在相同的油体系中，Pe也随着增溶程度的增加而急剧下降。因此，在加油初期，大部分加入的油渗透到栅栏层中。这引起了l α相中表面活性剂混合分数的变化。随后，随着油的进一步加入，油被溶解在双分子层的核心。
The mixing fraction of didodecyldimethylammonium bromide (DDAB) in dodecyltrimethylammonium bromide + DDAB to produce a lamellar liquid crystal (Lα) abruptly decreases upon addition of a small amount ofm-xylene, whereas the mixing fraction becomes constant at highm-xylene content. Similar results were obtained in saturated hydrocarbon systems. It is considered that oil molecules in the surfactant palisade layer increases the effective cross-sectional area per surfactant head group, as, whereas asis constant if the oil molecules are solubilized in the core of the liquid crystal. The volume fraction of penetrating oil in the total solubilized oil is defined as a penetration parameter, Pe, which is calculated from small-angle X-ray scattering data. Pe is high in them-xylene system, whereas it is low in then-decane system. Even in the same oil system, Pe decreases dramatically with increasing solubilization. Hence, most of the oil added penetrates into a palisade layer at an early stage of oil addition. This causes a change in the mixing fraction of surfactant in theLαphase. Thereafter the oil is solubilized in the core of the bilayer with further addition of oil.