Printability study of self-supporting graphene oxide-laponite nanocomposites for 3D printing applications
Printability study of self-supporting graphene oxide-laponite nanocomposites for 3D printing applications
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DOI：
10.1007/s00170-021-06870-5
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发表时间：
2021-03
期刊：
影响因子：
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通讯作者：
Manish Sakhakarmy;Siyu Tian;Lily Raymond;Guoping Xiong;Jihua Chen;Yifei Jin
中科院分区：
文献类型：
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作者：
Manish Sakhakarmy;Siyu Tian;Lily Raymond;Guoping Xiong;Jihua Chen;Yifei Jin
石墨烯是一种二维碳同素异形体，由于其优良的固有性质，在各个领域得到了广泛的应用。石墨烯及其衍生物通常具有较差的印刷性，这使得创建三维(3D)结构具有挑战性。本工作的目的是研究一种纳米粘土辅助的3D打印方法，以打印自支撑氧化石墨烯(GO)-磷灰石纳米复合材料的3D结构。由于纳米粘土和GO之间的物理交联性，所得到的纳米复合材料可以在空气中直接打印成复杂的几何形状。与以前报道的溶剂挥发法制备的GO-LUP复合材料相比，混合和离心法获得的GO-LUP复合材料的质量比(5.00~32.00)范围大得多。结果表明，纳米粘土添加剂和GO的浓度对挤出性能有显著影响。此外，通过评估长丝的形状/尺寸以及在支撑结构之间印刷时的长丝变形来研究挤压长丝的成形性。我们的结果表明，诸如点胶压力、路径速度、喷嘴直径和离线距离等操作条件可以用来控制基板上印刷细丝的宽度。由于所提出的氧化磷灰石纳米复合材料的自支撑特性，有可能在支撑结构之间形成连续的细丝而几乎没有偏转。从而成功地制备了形状定义良好、几何形状可控的3D支架，证明了利用纳米粘土辅助3D打印技术实现复杂的3D石墨烯结构是可行的。
Graphene, a two-dimensional (2D) carbon allotrope, has been widely used in various fields due to its excellent inherent properties. Graphene and its derivatives usually possess poor printability, which makes it challenging to create three-dimensional (3D) structures. The objective of this work is to investigate a nanoclay-assisted 3D printing approach to print 3D structures from self-supporting graphene oxide (GO)-laponite nanocomposites. Due to the physical crosslinking between nanoclay and GO, the resulted nanocomposites can be directly printed into complex geometries in air. A significantly large range of laponite to GO mass ratio (5.00 to 32.00) was achieved by a mixing and centrifuging method as compared to previously reported GO-laponite composites made by the solvent evaporation method. It is found that the concentrations of nanoclay additives and GO can significantly affect the extrudability. In addition, the formability of the extruded filaments was studied by assessing the filament shapes/dimensions as well as the filament deflections when printing between supporting structures. Our results show that operating conditions such as dispensing pressure, path speed, nozzle diameter, and stand-off distance can be used to control the width of printed filaments on a substrate. Due to the self-supporting property of the proposed GO-laponite nanocomposites, it is possible to form continuous filaments with negligible deflections between supporting structures. Thus, 3D scaffolds with well-defined shape and controllable geometries have been successfully fabricated, which proves the proposed nanoclay-assisted 3D printing technology to achieve complex 3D graphene structures is feasible.