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Harnessing Photochemical Shrinkage in Direct Laser Writing for Shape Morphing of Polymer Sheets
Advanced Materials ( IF 29.4 ) Pub Date : 2017-09-25 , DOI: 10.1002/adma.201703024
Anton A. Bauhofer 1, 2 , Sebastian Krödel 1, 2 , Jan Rys 1, 2 , Osama R. Bilal 1, 2 , Andrei Constantinescu 3 , Chiara Daraio 2
Affiliation  

Structures that change their shape in response to external stimuli unfold possibilities for more efficient and versatile production of 3D objects. Direct laser writing (DLW) is a technique based on two‐photon polymerization that allows the fabrication of microstructures with complex 3D geometries. Here, it is shown that polymerization shrinkage in DLW can be utilized to create structures with locally controllable residual stresses that enable programmable, self‐bending behavior. To demonstrate this concept, planar and 3D‐structured sheets are preprogrammed to evolve into bio‐inspired shapes (lotus flowers and shark skins). The fundamental mechanisms that control the self‐bending behavior are identified and tested with microscale experiments. Based on the findings, an analytical model is introduced to quantitatively predict bending curvatures of the fabricated sheets. The proposed method enables simple fabrication of objects with complex geometries and precisely controllable shape morphing potential, while drastically reducing the required fabrication times for producing 3D, hierarchical microstructures over large areas in the order of square centimeters.

中文翻译:

利用直接化学刻写中的光化学收缩来对聚合物片材进行形变

响应外部刺激而改变形状的结构为3D对象的更高效和多功能生产提供了可能性。直接激光写入(DLW)是一种基于双光子聚合的技术,允许制造具有复杂3D几何形状的微结构。在此表明,可以利用DLW中的聚合收缩来创建具有局部可控残余应力的结构,从而实现可编程的自弯曲行为。为了证明这一概念,对平面和3D结构的图纸进行了预编程,使其演变为具有生物灵感的形状(荷花和鲨鱼皮)。控制自我弯曲行为的基本机制已通过微型实验进行了识别和测试。根据调查结果,引入分析模型以定量地预测所制造的板的弯曲曲率。所提出的方法能够简单地制造具有复杂几何形状和精确可控的形状变形潜力的物体,同时极大地减少了在平方厘米量级的大面积上生产3D分层微结构所需的制造时间。
更新日期:2017-09-25
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