Xiao Xingzhi, Li Gang, Liu Tingting, Gu Mingfei
School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China.
Nanomaterials (Basel). 2022 Sep 5;12(17):3076. doi: 10.3390/nano12173076.
Inkjet printing of high-viscosity (up to 10 mPa·s) nanosilver inks is an interesting emerging technology to achieve the 3D fully printed fabrication of electronic products. The highly viscous force of the ink makes it impossible to achieve droplet ejection with the traditional piezoelectric-driven drop-on-demand inkjet method. In this study, a pneumatic needle jetting valve is adopted to provide sufficient driving force. A large number of high-viscosity inkjet printing tests are carried out, and the jetting behavior is recorded with a high-speed camera. Different jetting states are determined according to the recorded images, and the causes of their formation are revealed. Additionally, the effects of the operating pressure, preload angle, and fluid pressure on jetting states are elucidated. Furthermore, the jetting phase diagram is obtained with the characterization of the Reynolds number and the printable region is clarified. This provides a better understanding of high-viscosity inkjet printing and will promote the application of high-viscosity inkjet printing in 3D fully printed electronic products.
喷墨打印高粘度（高达10 mPa·s）纳米银墨水是一种有趣的新兴技术，可实现电子产品的3D全打印制造。墨水的高粘性使得无法通过传统的压电驱动按需滴墨喷墨方法实现液滴喷射。在本研究中，采用气动针式喷射阀来提供足够的驱动力。进行了大量高粘度喷墨打印测试，并用高速相机记录喷射行为。根据记录的图像确定不同的喷射状态，并揭示其形成原因。此外，阐明了操作压力、预载角度和流体压力对喷射状态的影响。此外，通过雷诺数的表征获得了喷射相图，并明确了可打印区域。这有助于更好地理解高粘度喷墨打印，并将推动高粘度喷墨打印在3D全打印电子产品中的应用。
