AI 中文总结
研究分子手性对液晶乳液中液滴分裂及螺旋纤维形成的控制，通过添加手性掺杂剂，利用胆甾相螺距这一设计变量，借助数值模拟，实现精确控制液滴分裂并使中尺度结构尺寸与温度解耦。
AI 中文摘要
分子手性是镜像对称性破缺的一个来源，但利用它来控制具有可调长度尺度的中尺度结构仍然具有挑战性。在此，我们证明向由可变形双表面活性剂界面界定的向列型液晶液滴中添加手性掺杂剂可控制其形态发生：液滴直径与胆甾相螺距的比值决定了液滴在冷却时是不对称还是对称分裂，以及它们是否转变为单链或双链螺旋纤维。纤维周期和厚度均与胆甾相螺距呈线性比例关系，在自成型窗口内随温度变化小于2%。数值模拟表明，界面处手性驱动的弹性应力使液滴失稳并触发尖点介导的形状转变。这些结果将胆甾相螺距确立为一个设计变量，以精确控制液滴分裂，并使自发形成的中尺度结构的尺寸与温度依赖性解耦。
英文摘要
Molecular chirality is a source of broken mirror symmetry, but using it to control mesoscale structures with a tunable length scale remains challenging. Here, we demonstrate that adding a chiral dopant to nematic liquid crystal droplets bounded by a deformable two-surfactant interface controls their morphogenesis: the ratio of droplet diameter to cholesteric pitch determines whether droplets divide asymmetrically or symmetrically upon cooling, and whether they transform into single- or double-strand helical fibers. The fiber periodicity and thickness both scale linearly with the cholesteric pitch, which varies by less than 2% with temperature across the self-shaping window. Numerical simulations reveal that chirality-driven elastic stresses at the interface destabilize the droplets and trigger cusp-mediated shape transformations. These results establish cholesteric pitch as a design variable to precisely control droplet division and decouple the dimensions of spontaneously formed mesoscale structures from temperature dependence.
Comments17 pages, 3 figures
