DILUTE LAMELLAR AND L3 PHASES IN THE BINARY WATER-C12E5 SYSTEM
DILUTE LAMELLAR AND L3 PHASES IN THE BINARY WATER-C12E5 SYSTEM
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DOI：
10.1039/ft9908602253
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发表时间：
1990-06-21
期刊：
影响因子：
--
通讯作者：
OLSSON, U
中科院分区：
文献类型：
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作者：
STREY, R;SCHOMACKER, R;OLSSON, U
水-C12 E5的二元相图已被研究，重点是L3和稀层状相，发现其分别溶胀至约99.5和98.8重量%的水，远比先前报道的。针对这两个阶段，我们进行了静态光和小角中子散射和电导率测量。发现层状相中的重复距离超过3000 μ m。观察到与理想一维溶胀的小但显著的偏差。这种偏差可以用仅平均平坦的双层的柔性来解释。从各向同性L3相的电导率和小角度中子散射数据，在大部分的稳定范围内，与三维连续双层结构一致。然而，在大的水含量的电导率的增加表明的结构分解成更小的片段。我们的研究结果表明，较简单的二元体系表现出相同的特征的更复杂的多组分系统，包括盐水，离子表面活性剂和助表面活性剂。
The binary phase diagram of water–C12E5 has been studied with emphasis on the L3 and dilute lamellar phases, which were found to swell to approximately 99.5 and 98.8 wt % of water, respectively, much further than has been reported previously. Focusing on these two phases, we have carried out static light and small-angle neutron scattering and electrical conductivity measurements. The repeat distance in the lamellar phase was found to exceed 3000 Å. A small, but significant deviation from ideal one-dimensional swelling was observed. This deviation may be explained in terms of flexibility of the bilayers that are flat only on average. Electrical conductivity and small-angle neutron scattering data from the isotropic L3 phase are, over most of the stability range, consistent with a three-dimensional continuous bilayer structure. However, at large water contents an increase in the conductivity indicates a breakup of the structure into smaller fragments. Our results show that the simpler binary system exhibits the same characteristic features as the more complex multicomponent systems, involving brine, ionic surfactant and cosurfactant.