中胚层
材料科学
形状记忆合金
弹性体
液晶
相变
液晶
机制(生物学)
形状变化
实现(概率)
相(物质)
纳米技术
化学物理
复合材料
光电子学
凝聚态物理
有机化学
物理
统计
化学
生物
进化生物学
量子力学
数学
作者
Guancong Chen,Binjie Jin,Yongrong Shi,Qian Zhao,Youqing Shen,Tao Xie
标识
DOI:10.1002/adma.202201679
摘要
Realization of muscle-like actuation for a liquid crystal elastomer (LCE) requires mesogen alignment, which is typically achieved/fixed chemically during the synthesis. Post-synthesis regulation of the alignment in a convenient and repeatable manner is highly desirable yet challenging. Here, a dual-phase LCE network is designed and synthesized with a crystalline melting transition above a liquid crystalline transition. The crystalline phase can serve as an "alignment frame" to fix any mechanical deformation via a shape memory mechanism, leading to corresponding mesogen alignment in the liquid crystalline phase. The alignment can be erased by melting, which can be the starting point for reprogramming. This strategy that relies on a physical shape memory transition for mesogen alignment permits repeated reprogramming in a timescale of seconds, in stark contrast to typical methods. It further leads to unusual versatility in designing 3D printed LCE with unlimited programmable actuation modes.
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