ON THE SWELLING OF BICONTINUOUS LYOTROPIC MESOPHASES
ON THE SWELLING OF BICONTINUOUS LYOTROPIC MESOPHASES
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DOI：
10.1051/jp2:1995121
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发表时间：
1995-01-01
期刊：
影响因子：
--
通讯作者：
HYDE, ST
中科院分区：
文献类型：
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作者：
ENGBLOM, J;HYDE, ST
分析了两层表面活性剂（或脂质）在水中的海绵状双连续中间相随稀释度的变化。假设(i)聚集体厚度恒定，（ii）每个表面活性剂分子在双分子层内的假想表面上的表面积固定，推导出膨胀的解析公式。推导了双连续薄膜的近似膨胀规律，并与片状、棒状和球状聚集体的膨胀行为进行了比较。结果表明，海绵状的“水包油”双连续聚集体可以很容易地与表面活性剂/脂质聚集体中的棒状、片状或球状物区分开来；反曲率聚集体（“油包水”）的形态不容易从膨胀数据中推断出来。将（有序或无序）对称和不对称海绵、片、棒和球的准确结垢规律与二元单油酸甘油-水体系和伪二元二十二烷基溴化二甲基铵-环己烷-水体系的双连续立方相实验数据以及稀海绵样相的某些数据进行了比较。在后一种情况下，散射数据作为成分的函数可以识别对称和不对称海绵相。
The swelling of sponge-like bicontinuous mesophases of bilayers of surfactant (or lipid) in water as a function of dilution is analyzed. Analytic formulae for the swelling are derived assuming (i) constant aggregate thickness and (ii) fixed surface area per surfactant molecule at an imaginary surface located within the bilayer. Approximate swelling laws are derived for bicontinuous films and compared with swelling behaviour of disconnected sheet-like, rod-like and globular aggregates. It is shown that sponge-like ''oil-in-water'' bicontinuous aggregates can be readily distinguished from rods, sheets or globules in surfactant/lipid aggregates; the morphologies of aggregates of reversed curvature (''water-in-oil'') are less easily deduced from swelling data. Accurate scaling laws for (ordered or disordered) symmetric and asymmetric sponges, sheets, rods and globules are compared with experimental data of bicontinuous cubic phases in the binary glycerol monooleate - water system and the pseudo-binary didodecyl dimethyl ammonium bromide - cyclohexane - water system as well as some data within dilute sponge-like phases. In the latter cases, scattering data as a function of composition admit identification of symmetric and asymmetric sponge phases.