3D Printing Graphene Oxide Soft Robotics.
3D Printing Graphene Oxide Soft Robotics.
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DOI：
10.1021/acsnano.1c06823
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发表时间：
2022-02
期刊：
影响因子：
17.1
通讯作者：
Guo-Xiang Zhou;Yan-Ge Yu;Z. Yang;Dechang Jia;Philippe Poulin;Yu Zhou;Jing Zhong
中科院分区：
文献类型：
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作者：
Guo-Xiang Zhou;Yan-Ge Yu;Z. Yang;Dechang Jia;Philippe Poulin;Yu Zhou;Jing Zhong
我们提出了一种通用的策略来3D打印氧化石墨烯（GO）复合结构，其中GO高度对齐和致密，通过直接墨水书写和约束干燥的组合。该约束不仅允许在纳米尺度下产生伴随水蒸发的巨大毛细管力，这引起GO的高度压实和排列，而且还限制了挤出长丝仅沿沿着壁厚方向的收缩，因此，成功地保持了宏观尺度下结构的均匀性。研究发现，在干燥过程中，胶体的收缩应力逐渐增大，最大值超过0.74MPa，明显高于其他胶体体系。有趣的是，由于具有不同约束取向的板之间的收敛，在拐角处跨厚度方向自然形成孔隙率梯度。这使我们能够3D打印基于湿度敏感GO的软机器人。
We propose a universal strategy to 3D printing the graphene oxide (GO) complex structure with GO highly aligned and densely compacted, by the combination of direct ink writing and constrained drying. The constraints not only allow the generation of a huge capillary force accompanied by water evaporation at nanoscale, which induces the high compaction and alignment of GO, but also limit the shrinkage of the extruded filaments only along the wall thickness direction, therefore, successfully maintaining the uniformity of the structure at macroscale. We discover that the shrinkage stress gradually increased during the drying process, with the maximum exceeding ∼0.74 MPa, significantly higher than other colloidal systems. Interestingly, because of the convergence between plates with different orientations of the constraints, a gradient of porosity naturally formed across the thickness direction at the corner. This allows us to 3D print humidity sensitive GO based soft robotics.