空气-水界面上近晶相液晶多层膜的线张力和结构
Line tension and structure of smectic liquid crystal multilayers at the air-water interface
摘要：
在空气/水界面上，不同厚度的4，-8-烷基[1，1，-联苯]-4-腈（8 CB）微区共存于同一层Langmuir膜中，形成多层膜。在畴界的刃位错导致线张力，这决定了畴的形状和动力学。通过观察从小变形开始的畴松弛过程，我们发现线张力线性依赖于膜中共存相之间的厚度差。与文献中的理论处理的比较表明，在边界处的刃位错位于膜的中心附近，这意味着8 CB多层膜几乎是对称的空气/水界面。
英文摘要：
At the air/water interface, 4,-8-alkyl[1,1,-biphenyl]-4-carbonitrile (8CB) domains with different thicknesses coexist in the same Langmuir film, as multiple bilayers on a monolayer. The edge dislocation at the domain boundary leads to line tension, which determines the domain shape and dynamics. By observing the domain relaxation process starting from small distortions, we find that the line tension is linearly dependent on the thickness difference between the coexisting phases in the film. Comparisons with theoretical treatments in the literature suggest that the edge dislocation at the boundary locates near the center of the film, which means that the 8CB multilayers are almost symmetric with respect to the air/water interface.
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