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首页> 外文期刊>The Journal of Chemical Physics >Small-angle-neutron-scattering from giant water-in-oil microemulsion droplets. II. Polymer-decorated droplets in a quaternary system
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Small-angle-neutron-scattering from giant water-in-oil microemulsion droplets. II. Polymer-decorated droplets in a quaternary system

机译：从巨大的油包水微乳液液滴中散射出小角度中子。二。四元体系中的聚合物装饰液滴

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Amphiphilic block copolymers of the type poly(ethylenepropylene)-co-poly(ethyleneoxide) dramatically enhance the solubilisation efficiency of non-ionic surfactants in microemulsions that contain equal volumes of water in oil. Consequently, the length scale of the microstructure of such bicontinuous microemulsions is dramatically increased up to the order of a few 100 nm. In this paper, we show that this so-called efficiency boosting effect can also be applied to water-in-oil microemulsions with droplet microstructure. Such giant water-in-oil microemulsions would provide confined compartments in which chemical reactions of biological macromolecules can be performed on a single molecule level. With this motivation we investigated the phase behavior and the microstructure of oil-rich microemulsions containing D2O, n-decane(d22), C10E4 and the amphiphilic block copolymer PEP5-PEO5 [poly(ethylenepropylene)-co-poly(ethyleneoxide), weight per block of 5000 g/mol]. We found that 15 wt % of water can be solubilised by 5 wt % of surfactant and block copolymer when about 6 wt % of surfactant is replaced by the block copolymer. Small-angle-neutron-scattering experiments were performed to determine the length scales and microstructure topologies of the oil-rich microemulsions. To analyze the scattering data, we derived a novel form factor that also takes into account the scattering contribution of the hydrophobic part of the block copolymer molecules that reside in the surfactant shell. The quantitative analysis of the scattering data with this form factor shows that the radius of the largest droplets amounts up to 30 nm. The novel form factor also yielded qualitative information on the stretching of the polymer chains in dependence on the polymer surface density and the droplet radius. (C) 2008 American Institute of Physics.
机译：聚（乙烯丙烯）-共聚（环氧乙烷）类型的两亲嵌段共聚物显着提高了非离子型表面活性剂在油中含水量相等的微乳液中的增溶效率。因此，这种双连续微乳液的微结构的长度尺度显着增加到几百nm。在本文中，我们证明了这种所谓的效率提升效果也可以应用于具有微滴结构的油包水型微乳液。这种巨大的油包水型微乳液将提供密闭的隔室，在其中可以在单分子水平上进行生物大分子的化学反应。以此动机，我们研究了含D2O，正癸烷（d22），C10E4和两亲嵌段共聚物PEP5-PEO5 [聚（乙烯丙烯）-共聚（环氧乙烷））的富油微乳的相行为和微观结构，每单位重量块5000克/摩尔]。我们发现当约6重量％的表面活性剂被嵌段共聚物代替时，15重量％的水可以被5重量％的表面活性剂和嵌段共聚物溶解。进行小角中子散射实验以确定富含油的微乳状液的长度尺度和微观结构拓扑。为了分析散射数据，我们得出了一种新颖的形状因数，该形状因数还考虑了驻留在表面活性剂壳中的嵌段共聚物分子疏水部分的散射贡献。使用这种形状因子对散射数据进行的定量分析表明，最大液滴的半径最大为30 nm。新颖的形状因数还根据聚合物表面密度和液滴半径得出有关聚合物链拉伸的定性信息。 （C）2008美国物理研究所。

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