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首页> 外文期刊>Tenside Surfactants Detergents: Journal for Theory, Technology and Application of Surfactants >Structures of Lyotropic-cholesteric Disk-like Phases Induced by Prednisolon in Lyotropic-nematic Host Phases
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Structures of Lyotropic-cholesteric Disk-like Phases Induced by Prednisolon in Lyotropic-nematic Host Phases

机译：泼尼松龙在溶致向列型宿主相中诱导的溶致胆甾型盘状相的结构

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摘要

In the tenary system hexadecyl dimethylethylammonium bromide (C-(16)Me_2EABr)/water-decanol, Iyotropic-cholesteric disk-Iike phases (ChD) were induced in a Iyotropic-nematic ma- trix by addition of prednisolon. They were characterised by their structural parameters obtained by X-ray measurements. In these studies, both the concentration of the prednisolon and the composition of the matrix were varied. The effect of the prednisolon concentration on the structural formation of the ChD phase is manifested in a decrease in helix length. By orientation in a magnetic field and the use of microslides, separation of the spaces between the micelles was achieved as Bragg values perpendicular to and parallel with the optical axis. With increasing content of prednisolon in the matrix of the ND phase, two different effects on the anisotropy of the periodicity volume are ob served. At first, the radial extension of the micelles of the ChD phase increased with constant micellar space in the normal direction. Further increase in the prednisolon concentration exceeding y > 1 % w/w resulted in the formation of an isotropic periodicity volume. The effect of the composition of the ND phase on the properties of the ChD phase crucially depends on the mole ratio between prednisolon and the surfactant. The diminution of micellar volumes and decreasing anisotropy of the periodicity volume with increasing surfactant concentration can be understood in terms of a transition from the disk-Iike to the spherical micelle.
机译：在辛酸体系中，十六烷基二甲基乙基溴化铵（C-（16）Me_2EABr）/水/正癸醇，通过添加泼尼松龙，在各向同性-向列型基质中诱导了各向同性-胆甾型盘状相（ChD）。它们的特征在于通过X射线测量获得的结构参数。在这些研究中，泼尼松龙的浓度和基质的组成均发生变化。泼尼松龙浓度对ChD相结构形成的影响表现为螺旋长度的减少。通过在磁场中的定向和微幻灯片的使用，胶束之间的空间的分离实现为与光轴垂直和平行的布拉格值。随着ND相基质中泼尼松龙含量的增加，观察到了对周期性体积各向异性的两种不同影响。首先，ChD相胶束的径向延伸随法向方向上恒定的胶束空间而增加。泼尼松龙浓度的进一步增加超过y> 1％w / w，导致形成各向同性的周期性体积。 ND相组成对ChD相性质的影响关键取决于泼尼松龙和表面活性剂之间的摩尔比。胶束体积的减小和周期性体积的各向异性随着表面活性剂浓度的增加而降低，可以理解为从盘状分子到球形胶束的转变。

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