Phase behaviors of colloidal analogs of bent-core liquid crystals.
Phase behaviors of colloidal analogs of bent-core liquid crystals.
复制标题
弯芯液晶胶体类似物的相行为
DOI：
10.1126/sciadv.aas8829
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发表时间：
2018-05
期刊：
影响因子：
13.6
通讯作者：
Nie Z
中科院分区：
文献类型：
--
作者：
Yang Y;Pei H;Chen G;Webb KT;Martinez-Miranda LJ;Lloyd IK;Lu Z;Liu K;Nie Z
弯曲的胶体棒显示出迷人的极性有序和手性形成，尽管棒的非手性性质。弯曲核液晶(LC)分子形成的中间相具有迷人的极序和超分子手性，尽管介元具有非手性。具有几何相似性的胶体粒子的组装不仅对原子或分子的物理行为提供了新的见解，而且还导致了具有广泛应用的新材料的出现。尽管在胶体合成和组装方面取得了巨大的进展，但对于液晶性质的发现和应用开发，还缺乏弯芯分子介孔分子的胶体模型体系。本文从实验和模拟两个方面系统地研究了弯芯液晶介孔胶体类似物的相行为。我们证明了具有受控弯曲角度(α)和纵横比(L/D，分别为L和D分别为每根棒臂的长度和直径)的弯曲棒可以自发组装成几种典型的香蕉相，包括近晶A相、近晶C相、同斜倾斜类反铁电近晶相和扭曲近晶相，类似于弯曲核液晶分子。这些相的形成和转变强烈地依赖于棒材的几何参数。绘制了相图，说明了在α和L/D空间中所有LC相的存在和稳定范围。这项工作为开发新型复杂类型的分子或胶体自组织以及具有电光或非线性光学性质的新型功能材料打开了大门。
Bent colloidal rods exhibit fascinating polar ordering and chirality formation despite the achiral nature of the rods. Bent-core liquid crystal (LC) molecules are known to form mesophases with fascinating polar order and supramolecular chirality despite the achiral nature of the mesogens. The assembly of colloidal particles with geometrical similarity to bent-core molecular mesogens not only provides new insights into the physical behaviors of atoms or molecules but also leads to new materials with broad applications. Despite tremendous progress in colloidal synthesis and assembly, there has been a lack of colloidal model systems of bent-core molecular mesogens for LC property discovery and application development. This article describes a systematic study on the phase behaviors of colloidal analogs of bent-core LC mesogens in both experiments and simulations. We demonstrated that bent rods with controlled bending angle (α) and aspect ratio (L/D, with L and D as the length and diameter of each rod arm, respectively) can spontaneously assemble into several typical banana phases including smectic A, smectic C, synclinic tilted antiferroelectric-like smectic, and twist smectic phases, resembling bent-core LC molecules. The formation and transition of these phases were found to be strongly dependent on the geometric parameters of rods. Phase diagrams were developed to illustrate the existence and stability range of all the LC phases in α and L/D space. This work opens the door to the development of novel complex types of molecular or colloidal self-organization and new functional materials with electro-optical or nonlinear optical properties.
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