Force-Induced Formation of Twisted Chiral Ribbons
Force-Induced Formation of Twisted Chiral Ribbons
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DOI：
10.1103/physrevlett.125.018002
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发表时间：
2020-06-30
影响因子：
8.6
通讯作者：
Powers, Thomas R.
中科院分区：
文献类型：
--
作者：
Balchunas, Andrew;Jia, Leroy L.;Powers, Thomas R.
我们证明了非手性拉伸力将由手性棒组成的盘状胶体膜转变为具有与手性棒的优选扭转相反的手持手的扭曲带。利用一种施加无扭矩边界条件的实验技术，我们同时测量了力-伸长曲线和带状形状。一个有效的理论，解释了薄膜的弯曲能，并使用边缘的几何性质来模拟内部液晶自由度，解释了测量的力-伸长曲线和力诱导的扭曲形状。
We demonstrate that an achiral stretching force transforms disk-shaped colloidal membranes composed of chiral rods into twisted ribbons with handedness opposite the preferred twist of the rods. Using an experimental technique that enforces torque-free boundary conditions we simultaneously measure the force-extension curve and the ribbon shape. An effective theory that accounts for the membrane bending energy and uses geometric properties of the edge to model the internal liquid crystalline degrees of freedom explains both the measured force-extension curve and the force-induced twisted shape.