论文标题
剪切诱导的纳米倍数排序和浓缩表面活性剂网相中的不稳定性
Shear-induced ordering of nano-pores and instabilities in concentrated surfactant mesh phases
论文作者
论文摘要
具有牢固结合的柜台的混合表面活性剂系统显示出许多有趣的阶段，例如由无序缺陷阵列组成的随机网格相（双层中充满水填充的纳米倍）。本研究介绍了剪切下的随机网相到有序的网格相的非平衡相变，在三维中，纳米倍数之间具有高度的连贯性。在不同的剪切应力条件下的原位小角度同步加速器X射线研究显示，X射线衍射中的尖锐bragg峰成功地索引了r $ \ bar {3} $ m空间组对称性的菱形晶格。有序的网格相在较高的剪切应力下显示同构双胞胎和屈曲。我们的实验研究提出了在迄今尚未探索的浓缩阳离子表面活性剂系统中富含非平衡相变的，并为定量理解提供了动力。
Mixed surfactant systems with strongly bound counterions show many interesting phases such as the random mesh phase consisting of a disordered array of defects (water-filled nano-pores in the bilayers). The present study addresses the non-equilibrium phase transition of the random mesh phase under shear to an ordered mesh phase with a high degree of coherence between nano-pores in three-dimension. In-situ small-angle synchrotron X-ray study under different shear stress conditions shows sharp Bragg peaks in the X-ray diffraction, successfully indexed to the rhombohedral lattice with R$\bar{3}$m space group symmetry. The ordered mesh phase shows isomorphic twinning and buckling at higher shear stress. Our experimental studies bring out rich non-equilibrium phase transitions in concentrated cationic surfactant systems with strongly bound counterions hitherto not well-explored and provide motivation for a quantitative understanding.
