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arXiv 1504.04561cond-mat.soft
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层状溶致相中的扩散系数:表面活性剂结构缺陷的证据

Diffusion Coefficients in a Lamellar Lyotropic Phase: Evidence for Defects Connecting the Surfactant Structure

Doru Constantin, Patrick Oswald

摘要:

我们使用光漂白后的荧光恢复法测量了非离子二元体系C $_{12}$ EO $_6$ /H $_2$ O在层状相中的扩散系数。在接近层状-各向同性相变时,沿层状的扩散系数突然增加。我们解释这一功能的缺陷连接的表面活性剂结构。在一个简单的模型中给出的缺陷密度和缺陷能量的变化接近过渡的估计。

英文摘要:

We measure diffusion coefficients in the lamellar phase of the nonionic binary system C$_{12}$EO$_6$/H$_2$O using fluorescence recovery after photobleaching. The diffusion coefficient across the lamellae shows an abrupt increase upon approaching the lamellar-isotropic phase transition. We interpret this feature in terms of defects connecting the surfactant structure. An estimation of the defect density and of the variation in defect energy close to the transition is given in terms of a simple model.

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