限制在亚微米胶囊中的液晶,Langmuir

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限制在亚微米胶囊中的液晶
Langmuir ( IF 3.7 ) Pub Date : 2018-08-21 00:00:00 , DOI: 10.1021/acs.langmuir.8b01056
Haiyan Peng _{1,

2} , Wenhong Jiang _{1,

3} , Qingkun Liu ₄ , Guannan Chen ₁ , Mingli Ni ₁ , Fuxin Liang ₃ , Yonggui Liao _{1,

2} , Xiaolin Xie _{1,

2} , Ivan I. Smalyukh _{2,

4}

Affiliation

受限条件下的液晶（LC）有序化和相变行为引起了广泛的关注，并使许多应用成为可能。但是，很少研究亚微米胶囊中LC的有序性和相变行为，这主要是由于缺乏对此类小型LC微胶囊的适当胶囊化和可视化方法。在本文中，我们通过使用基于乳液的界面溶胶-凝胶反应，获得了尺寸低至100 nm的亚微米级LC胶囊。研究了LC在亚微米限制条件下的行为，同时以可控制的方式调整了微囊壳表面的大小和化学组成。由于在强约束条件下LC的表面诱导有序排列，亚微米囊中的LC的相变温度不同于块状LC的相变温度，这会导致拓扑缺陷的形成并改变有序参数。使用非线性光学成像技术，我们研究了由于表面边界条件和LC弹性之间的竞争而产生的LC的指向矢场结构。结果表明，在各种限制条件下，纳米级封装可以显着影响液晶分子的指向矢和相变结构。我们探讨了由于表面边界条件和LC弹性之间的竞争而产生的LC的指向矢场结构。结果表明，在各种限制条件下，纳米级封装可以显着影响液晶分子的指向矢和相变结构。我们探讨了由于表面边界条件和LC弹性之间的竞争而产生的LC的指向矢场结构。结果表明，在各种限制条件下，纳米级封装可以显着影响液晶分子的指向矢和相变结构。

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Liquid Crystals under Confinement in Submicrometer Capsules

Liquid crystal (LC) ordering and phase transition behavior under confined conditions have attracted extensive attention and enabled many applications. However, the ordering and phase transition behavior of LCs in submicrometer capsules have seldom been studied, primarily due to the lack of proper capsulizing and visualization approaches to such small LC microcapsules. Herein, we achieve submicrometer LC capsules with the sizes down to 100 nm by using emulsion-based interfacial sol–gel reaction. The behavior of LCs under the submicrometer confinement conditions is investigated while the sizes and chemical composition of the microcapsule shell surface are tuned in a controllable way. The phase transition temperatures of LCs in the submicrometer capsules shift from those of bulk LCs due to the surface-induced ordering of LCs under the strong confinement conditions, which causes formation of topological defects and alters the order parameter. Using nonlinear optical imaging technology, we explore the structures of director field of LCs that arise as a result of the competition between the surface boundary conditions and LC elasticity. The results show that the nanoscale encapsulation can significantly influence the structural configurations of the director and phase transitions of LCs under various confinement conditions.

更新日期：2018-08-21

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