Fakhari Ahmad, Fernandes Célio, Galindo-Rosales Francisco José
Transport Phenomena Research Center (CEFT), Mechanical Engineering Department, Faculty of Engineering of the University of Porto, Rua Dr. Roberto Frias s/n, 4200-465 Porto, Portugal.
ALiCE-Associate Laboratory in Chemical Engineering, Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal.
Materials (Basel). 2022 Mar 31;15(7):2580. doi: 10.3390/ma15072580.
It is a common practice to add rheology modifiers to functional inks, such as graphene inks, to optimize the rheological properties so that they can be printed with a certain printing technique. This practice may lead to inks formulations with poorer electrical, optical, and mechanical performance upon its application, which are of paramount importance in printed electronics. In this study, we demonstrate for three different commercial graphene-based inks that it is possible to control the amount of ink transferred to the flat surface by tweaking printing parameters, such as the velocity and the length scale of the gravure cell, without modifying the rheology of the ink. Finally, the results are summarized in printing maps based on dimensionless numbers, namely, the capillary and Reynolds numbers.
在功能性油墨（如石墨烯油墨）中添加流变改性剂以优化流变性能，从而使其能够采用特定的印刷技术进行印刷，这是一种常见的做法。这种做法可能会导致油墨配方在应用时的电学、光学和机械性能变差，而这些性能在印刷电子学中至关重要。在本研究中，我们针对三种不同的商用石墨烯基油墨证明，通过调整印刷参数（如凹版网穴的速度和长度尺度），而不改变油墨的流变学性质，就有可能控制转移到平面上的油墨量。最后，基于无量纲数（即毛细管数和雷诺数）将结果总结在印刷图谱中。
