Electrowetting-assisted direct ink writing for low-viscosity liquids
Electrowetting-assisted direct ink writing for low-viscosity liquids
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DOI：
10.1016/j.jmapro.2021.07.028
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发表时间：
2021-09
影响因子：
6.2
通讯作者：
Yizhou Jiang;Xinnian Wang;J. Plog;A. Yarin;Yayue Pan
中科院分区：
文献类型：
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作者：
Yizhou Jiang;Xinnian Wang;J. Plog;A. Yarin;Yayue Pan
在传统的直接墨水书写（DIW）工艺中，低粘度液体通常是不可打印的，这极大地限制了墨水的选择和DIW的潜在应用。为了应对这一挑战，本工作报告了一种新的电场辅助方法，使低粘度液体的DIW。施加一外部电场于该点胶喷嘴与该基板之间，以垂直地拉动该印刷细丝，以降低沿着印刷方向的内部压力。我们提出的方法克服了低粘度材料连续挤出常见的毛细管不稳定特性。与传统方法相比，电场辅助DIW工艺显著拓宽了工艺参数的可用范围，将产量提高了150%以上，并将打印精度提高了四倍以上。这些发现表明了一种使用低粘度液体制造下一代功能设备的创新方法，这种液体过去很难甚至不可能打印。
In conventional direct ink writing (DIW) process, low-viscosity liquids are usually nonprintable, which greatly limits the choices of inks and the potential applications of DIW. To address this challenge, the present work reports a novel electric-field-assisted method to enable DIW of low-viscosity liquids. An external electric field is applied between the dispensing nozzle and the substrate, to vertically pull the printed filament for decreasing the internal pressure along the printing direction. Our proposed method overcomes the common capillary instability characteristic of continuous extrusion of low-viscosity materials. Compared with conventional approaches, the electric-field-assisted DIW process significantly widens the available range of process parameters, increases the throughput by over 150%, and improves the printing accuracy by more than four-fold. These findings indicate an innovative approach for the fabrication of next-generation functional devices using low-viscosity liquids, which used to be difficult or even impossible to print.