Pneumatic Conveying Printing Based on Super Hydrophobic Surface
Pneumatic Conveying Printing Based on Super Hydrophobic Surface
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DOI：
10.1002/admi.201902131
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发表时间：
2020-03
影响因子：
5.4
通讯作者：
Dege Li;Yi Cao;Hang Dong;Xinlei Wu;Qiang Sun;Chi Ma;Bingfang Huang;S. Rastgar;G. Wittstock;Yonghong Liu;Yanzhen Zhang
中科院分区：
文献类型：
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作者：
Dege Li;Yi Cao;Hang Dong;Xinlei Wu;Qiang Sun;Chi Ma;Bingfang Huang;S. Rastgar;G. Wittstock;Yonghong Liu;Yanzhen Zhang
在当今时代，喷墨打印技术在机械、电子甚至生物器件的制造中发挥着重要作用。然而，目前的IJP技术无法处理粘性油墨，这极大地阻碍了其广泛的工业应用。研究发现，利用喷嘴端面的超疏水材料，结合气流的拖拽和剪切效应，可以在相当低的喷射/挤压压力下产生微米级的液滴。这种传统IJP技术的变化被称为气动输送印刷（PCP），能够处理粘性油墨。自制了两个PCP原型机，分别采用微泵和微压电作为油墨挤出机，以验证其印刷性能。对于PCP，使用粘度高达数千mPa的微泵油墨可以打印。对于使用微压电的PCP，最大允许粘度约为700 mPa s。此外，由于油墨的挤出速度较慢，PCP过程中管道或油墨室内的压力和孔口的剪切速率比传统的IJP小得多。通过实验和仿真，揭示了PCP技术的原理。
In today's era, the inkjet printing (IJP) technique plays important roles in the fabrication of mechanical, electronical, and even biological devices. However, the current IJP techniques are incapable of handling viscous inks, which greatly hinder the extensive industrial application. Here, it is found that utilizing the superhydrophobic materials on the end surface of a nozzle combined with the dragging and shearing effects of an airflow, micrometer‐sized droplets can be generated under a quite low ejection/extrusion pressure. This variation of the traditional IJP technique is called pneumatic conveying printing (PCP) and is capable of handling viscous inks. Two PCP prototypes using micropump and micropiezo as the ink extruder, respectively, are homemade to demonstrate the printing performance. For the PCP using micropump inks with viscosities as high as several thousand mPa s can be printed. For the PCP using a micropiezo, the maximum allowed viscosity is about 700 mPa s. Furthermore, the pressure within the pipeline or ink chamber and the shear rate at the orifice during PCP are much smaller than those of the traditional IJP due to the slower ink extrusion rate. Both experiment and simulation are carried out to reveal the mechanisms of the proposed PCP technique.