3D Printing of Hydrogel Architectures with Complex and Controllable Shape Deformation
3D Printing of Hydrogel Architectures with Complex and Controllable Shape Deformation
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具有复杂且可控形状变形的水凝胶结构的3D打印
DOI：
10.1002/admt.201800713
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发表时间：
2019-04-01
影响因子：
6.8
通讯作者：
Zhou, Feng
中科院分区：
文献类型：
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作者：
Ji, Zhongying;Yan, Changyou;Zhou, Feng
由于复杂的工艺技术和对活性材料的苛刻要求，快速制备具有精确控制形状变形的结构是至关重要的挑战。为了解决这一问题，新兴的3D打印技术被用于一步构建仅由一种材料组成的可编程水凝胶结构，以执行各种复杂的3D形状变形。其基本原理是在水凝胶条的侧面引入次级微结构，由于不对称膨胀而产生弯曲或扭转变形。利用自由形状设计和制造的优点，利用基于立体光刻的3D打印技术构建了各种水凝胶结构，包括条状、片状和3D物体，通过可编程的微结构在特征表面上实现复杂和可控的形状变形，例如弯曲、扭曲，甚至模仿植物卷云或花瓣。最重要的是，各种响应性水凝胶与该方法兼容，从而可以实现刺激可逆的形状变形。作为概念验证，热响应水凝胶夹持器很容易实现通过热诱导抓取和释放物品来执行运输。简单的3D打印方法在各种水凝胶中都是通用的，这使得它在软机器人、组织工程、执行器和其他需要可编程形状变形的设备上有广泛的机会。
Facile preparation of architectures with precise control of shape deformations are crucial challenges due to the complicated process technique and harsh demands of the active materials. To address, the emerging 3D printing is employed to one-step build programmable hydrogel architectures composed of only one type of material to perform various complex 3D shape deformations. The basic principle is that the secondary microstructures are introduced in the side of hydrogel strips and result in the bending or twisting deformations due to the asymmetrical swelling. With the merits of freeform design and fabrication, various hydrogel architectures including strips, sheets, and 3D objects are built with stereolithography-based 3D printing, which realize the complex and controllable shape deformations via the programed microstructures on feature surfaces, such as bending, twisting, and even mimicking plant cirrus or petals. Most importantly, various responsive hydrogels are compatible to the approach, which can thus achieve stimuli-reversible shape deformations. As proof-of-concept, a thermal-responsive hydrogel gripper is readily realized to perform transportation by thermal-induced grasping and releasing items. The facile 3D printing approach yet versatile in various hydrogels makes it broad opportunities for soft robotics, tissue engineering, actuators, and other devices where programmable shape deformations are required.