执行机构
微电子机械系统
材料科学
热的
弯曲
聚合物
方向(向量空间)
变形(气象学)
制作
吸收(声学)
分子
Crystal(编程语言)
液晶
光电子学
温度梯度
分子物理学
分子动力学
光学
复合材料
物理
计算机科学
热力学
几何学
病理
人工智能
量子力学
医学
程序设计语言
替代医学
数学
作者
Kenneth D. M. Harris,Ruud Cuypers,Patrick Scheibe,Grietje N. Mol,Johan Lub,Cees W. M. Bastiaansen,Dirk J. Broer
摘要
We present polymeric MEMS materials which reversibly respond to either thermal or UV stimuli by moving between nearly flat (r ~ infinity) and tightly curled states (r ~ 5mm) with variations in the radiation environment or temperature. The molecular orientation gradient of a liquid crystal network controls the primary bending axes, while controlled order parameter variations are responsible for the degree of deformation. In the case of thermal activation, these order changes are dominated by thermal motion, while UV-switchable defects bring about reduced network order in the case of UV actuation. We report fabrication and operation of the actuators and supplementary data regarding alignment configurations for controllable deformations, the phase behaviour of the liquid crystal constituents, thermal expansions, and absorption of the UV dyes are included. We find that splayed molecular configurations are preferred over twisted modes due to their single deformation axis, and that the optimum concentration of active molecules for UV-driven actuation is on the order of 7-8wt.%.
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