Reprogrammable 3D Shaping from Phase Change Microstructures in Elastic Composites
Reprogrammable 3D Shaping from Phase Change Microstructures in Elastic Composites
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DOI：
10.1021/acsami.9b20818
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发表时间：
2020-01-22
影响因子：
9.5
通讯作者：
Lin, Jian
中科院分区：
文献类型：
--
作者：
Deng, Heng;Xu, Xianchen;Lin, Jian
在这里，我们展示了可重新编程的3D结构，这些结构由弹性材料和相变微粒制成的弹性复合材料片组装而成。通过局部热图案化控制微粒的相变，在预拉伸的复合片材中产生各向异性残余应变，然后当复合片材从外部应力释放时触发3D结构组装。热图案的几何形状和位置的调制导致复杂的2D-3D成形行为，例如弯曲、折叠、屈曲和扭曲。由于微粒的可逆相变，一旦它们被加热以重新编程不同的3D结构，这些编程的3D结构可以稍后恢复为2D片材。为了预测由2D复合材料板组装的3D结构，采用有限元建模，其显示出与实验合理的一致性。通过控制弹性复合材料中的相变微结构来可逆地编程3D形状的所展示的策略在制造功能设备（诸如可重构“纸”和形状可重构气动致动器）中提供了独特的能力。
Herein, we demonstrate reprogrammable 3D structures that are assembled from elastic composite sheets made from elastic materials and phase change microparticles. By controlling the phase change of the microparticles by localized thermal patterning, anisotropic residual strain is generated in the pre-stretched composite sheets and then triggers 3D structure assembly when the composite sheets are released from the external stress. Modulation of the geometries and location of the thermal patterns leads to complex 2D-3D shaping behaviors such as bending, folding, buckling, and wrinkling. Because of the reversible phase change of the microparticles, these programmed 3D structures can later be recovered to 2D sheets once they are heated for reprogramming different 3D structures. To predict the 3D structures assembled from the 2D composite sheets, finite element modeling was employed, which showed reasonable agreement with the experiments. The demonstrated strategy of reversibly programming 3D shapes by controlling the phase change microstructures in the elastic composites offers unique capabilities in fabricating functional devices such as a rewritable "paper" and a shape reconfigurable pneumatic actuator.