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首页> 外文期刊>Chemistry: A European journal >Formation of Water-in-CO_2 Microemulsins with Non-fluorous Surfactant Ls-54 andSolubilization of Biomacromolecules
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Formation of Water-in-CO_2 Microemulsins with Non-fluorous Surfactant Ls-54 andSolubilization of Biomacromolecules

机译：具有无氟表面活性剂Ls-54的水包CO_2微乳胶的形成和生物大分子的增溶

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摘要

The solubility of Ls-54 surfactant in supercritical CO_2 was detrmined. It was foud that the surfctant was highly soluble in SC CO-2 and the water-inCO_2 microemulsions could be formed, despite it being a non-fluorous and non-siloxane nonionic surfactant. The main reasons for the high solubility and formation of the microemulsions may be that the surfactant has four CO_2-philic groups (propylene oxie) and five hydrophilic groups (ethylene oxide) and its molecuar weight are relatively low. The resutls of this work provide useful informaiton for designing CO_2-soluble non-fluorous and non-siloxane surfactants. The phase behavior of the CO_2/Ls54/H_2O system, solvatochromic probe study, and the UV spectrum fo lysozyme proved the existence of water domains in the SC CO_2 microemulsions. The method of synchrotron radiation smallangle X-ray scattering was used to obtian the structural information on the Ls54 based water-in-CO_2 reverse micelles. By using the Guinier plot (InI(q) versus q~2) on the data sets in defined small q range (0.022-0.040 A~(-1)), the radii of the reverse micelles were obtaiend at different pressures and molar ratio fo water to surfatant, V_0, which were in the range of 20.4-25.2 A.
机译：测定了Ls-54表面活性剂在超临界CO_2中的溶解度。尽管表面活性剂是一种非氟和非硅氧烷的非离子表面活性剂，但可以证明它在SC CO-2中的溶解度很高，并且可以形成水包二氧化碳的微乳液。高溶解度和形成微乳状液的主要原因可能是表面活性剂具有四个CO_2-亲电基团（环氧丙烷）和五个亲水基团（环氧乙烷），其分子量相对较低。这项工作的结果为设计可溶于CO_2的非氟和非硅氧烷表面活性剂提供了有用的信息。 CO_2 / Ls54 / H_2O系统的相行为，溶剂变色探针研究和紫外光谱溶菌酶证明了SC CO_2微乳中存在水域。采用同步辐射小角X射线散射的方法来掩盖基于Ls54的CO 2包胶水反胶束的结构信息。通过在规定的小q范围（0.022-0.040 A〜（-1））上使用数据集上的Guinier图（InI（q）vs q〜2），反胶束的半径在不同压力和摩尔比下均获得从水到表面活性剂V_0的范围为20.4-25.2A。

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