Dual-Gel 4D Printing of Bioinspired Tubes
Dual-Gel 4D Printing of Bioinspired Tubes
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DOI：
10.1021/acsami.8b17218
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发表时间：
2019-02-27
影响因子：
9.5
通讯作者：
Gracias, David H.
中科院分区：
文献类型：
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作者：
Liu, Jiayu;Erol, Ozan;Gracias, David H.
具有径向或双边对称性的材料周期性图案的分布是普遍的自然设计原则。在许多生物形式中，管状形状是许多生物体的常见图案，它们对于生物植入物和软机器人也很重要。然而，战略性放置 3D 打印的膨胀和非膨胀材料片段以实现广泛不同的功能的简单设计原理尚未得到证实。在这里，我们报告了分段 3D 打印凝胶管的设计、制造和表征，该凝胶管由主动热响应膨胀凝胶（聚二异丙基丙烯酰胺）和被动热非响应凝胶（聚丙烯酰胺）组成。通过有限元模拟和实验，我们报告了基于两种凝胶的各种形状变化，包括单轴伸长、径向膨胀、弯曲和夹紧。热诱导形状变化的实现和表征对于机器人和生物医学工程至关重要。我们的研究提出了合理的方法来设计复杂的参数，具有高水平的定制和可调性，用于动态凝胶结构的增材制造。
The distribution of periodic patterns of materials with radial or bilateral symmetry is a universal natural design principle. Among the many biological forms, tubular shapes are a common motif in many organisms, and they are also important for bioimplants and soft robots. However, the simple design principle of strategic placement of 3D printed segments of swelling and nonswelling materials to achieve widely different functionalities is yet to be demonstrated. Here, we report the design, fabrication, and characterization of segmented 3D printed gel tubes composed of an active thermally responsive swelling gel (poly Nisopropylacrylamide) and a passive thermally nonresponsive gel (polyacrylamide). Using finite element simulations and experiments, we report a variety of shape changes including uniaxial elongation, radial expansion, bending, and gripping based on two gels. Actualization and characterization of thermally induced shape changes are of key importance to robotics and biomedical engineering. Our studies present rational approaches to engineer complex parameters with a high level of customization and tunability for additive manufacturing of dynamic gel structures.