标题： 向列相层在无手性液晶中的波动表现为条纹纹理 显示英文标题

标题： Undulations of smectic A layers in achiral liquid crystals manifested as stripe textures

摘要： 有机分子的自组装代表了一个迷人的平台，用于创建各种液晶（LC）纳米结构。 在本研究中，我们研究了手性化合物在向列相中的微米尺度层波动，实验上表现为由热处理诱导的规则条纹图案。 通过不同厚度的细胞中的偏振成像和光衍射实验评估了波动及其非谐波特性。 条纹形成的关键作用是由热膨胀系数的高负值所扮演的。 显示英文摘要

摘要： Self-assembly of organic molecules represents a fascinating playground to create various liquid crystalline (LC) nanostructures. In this work, we study layer undulations on micrometer scale in smectic A phases for achiral compounds, experimentally demonstrated as regular stripe patterns induced by thermal treatment. Undulations including their anharmonic properties are evaluated by means of polarimetric imaging and light diffraction experiments in cells with various thicknesses. The key role in stripe formation is played by high negative values of the thermal expansion coefficient.