Polar-Nonpolar Interfaces of Normal Bicontinuous Cubic Phases in Nonionic Surfactant/Water Systems Are Parallel to the Gyroid Surface.,Langmuir

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Polar-Nonpolar Interfaces of Normal Bicontinuous Cubic Phases in Nonionic Surfactant/Water Systems Are Parallel to the Gyroid Surface.
Langmuir ( IF 3.7 ) Pub Date : 2020-07-01 , DOI: 10.1021/acs.langmuir.0c00597
Toshihiko Oka , Noboru Ohta ₁ , Stephen T Hyde _{2,

3}

Affiliation

We investigated the structures of normal (type I) bicontinuous cubic phases in hexa-, hepta-, and octaethylene glycol dodecyl ether/water mixtures by small-angle X-ray crystallography of single-crystal domains. Reconstructed electron densities showed that the hydrophilic chains with high electron density are confined to a film centered on the surface of the Gyroid (a triply periodic minimal surface), while hydrophobic chains with low electron density are distributed within the pair of interwoven labyrinths carved out by the Gyroid. Further, the local minimum within the high electron density region, due to bulk water, coincides precisely with the Gyroid. This minimum is less pronounced in mixtures with longer ethylene glycol chains, consistent with their decreased water content. Our analysis clearly shows that the polar–nonpolar interfaces are parallel to the Gyroid surface in all mixtures. The repulsive hydration or overlapping force between the pair of facing monolayers of ethylene glycol chains on either side of the Gyroid surface is the likely origin of the parallel interfaces.

中文翻译：

非离子表面活性剂/水系统中正常双连续立方相的极性-非极性界面与陀螺表面平行。

我们通过单晶域的小角度X射线晶体学研究了六，七和八乙二醇十二烷基醚/水混合物中正常（I型）双连续立方相的结构。重建的电子密度显示，具有高电子密度的亲水链被限制在以Gyroid表面（周期性周期性最小表面）为中心的薄膜上，而具有低电子密度的疏水链则分布在由陀螺仪。此外，由于大量的水，在高电子密度区域内的局部最小值正好与陀螺仪一致。在具有更长的乙二醇链的混合物中，该最小值不太明显，这与它们降低的水含量一致。我们的分析清楚地表明，在所有混合物中，极性-非极性界面均与Gyroid表面平行。在Gyroid表面两侧的乙二醇链的一对面对的单分子层之间的排斥水合或重叠力是平行界面的可能来源。

更新日期：2020-08-04

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