Title: Discontinuous metric programming in liquid crystalline elastomers Show Chinese title

Title: 液晶弹性体中的不连续度量规划

Abstract: Liquid crystalline elastomers (LCEs) are shape-changing materials that exhibit large deformations in response to applied stimuli. Local control of the orientation of LCEs spatially directs the deformation of these materials to realize spontaneous shape change in response to stimuli. Prior approaches to shape programming in LCEs utilize patterning techniques that involve the detailed inscription of spatially varying nematic fields to produce sheets. These patterned sheets deform into elaborate geometries with complex Gaussian curvatures. Here, we present an alternative approach to realize shape-morphing in LCEs where spatial patterning of the crosslink density locally regulates the material deformation magnitude on either side of a prescribed interface curve. We also present a simple mathematical model describing the behavior of these materials. Further experiments coupled with the mathematical model demonstrate the control of the sign of Gaussian curvature, which is used in combination with heat transfer effects to design LCEs that self-clean as a result of temperature-dependent actuation properties. Show Chinese abstract

Abstract: 液晶弹性体（LCEs）是形状变化材料，它们对施加的刺激表现出大的变形。 LCEs 的局部取向控制在空间上引导这些材料的变形，以实现在刺激下的自发形状变化。 先前用于 LCEs 形状编程的方法利用了涉及空间变化向列场详细刻写的图案技术来产生薄片。 这些图案化的薄片变形为具有复杂高斯曲率的复杂几何形状。 在这里，我们提出了一种替代方法来实现 LCEs 的形状变化，其中交叉链接密度的空间图案在预定的界面曲线的两侧局部调节材料的变形程度。 我们还提出了一种简单的数学模型来描述这些材料的行为。 进一步的实验结合数学模型展示了高斯曲率符号的控制，该控制与热传递效应结合，用于设计由于温度依赖性驱动特性而自我清洁的 LCEs。