Wide range of droplet jetting angles by thin-film based surface acoustic waves

Jie Li, Seyedmehdi Hosseini Biroun, Ran Tao, Yong Wang, Hamdi Torun, Na Xu, Mohammad Rahmati, Yifan Li, Desmond Gibson, Chen Fu, Jingting Luo, Linxi Dong, Jin Xie, Richard Fu

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)
45 Downloads (Pure)


Nozzleless jetting of droplets with different jetting angles is a crucial requirement for 2D and 3D printing/bioprinting applications, and Rayleigh mode surface acoustic waves (SAWs) could be a potential technique for achieving this purpose. Currently, it is critical to vary the jetting angles of liquid droplets induced by SAWs and control the liquid jet directions. Generally, the direction of the liquid jet induced by SAWs generated from a bulk piezoelectric substrate such as LiNbO3 is along the theoretical Rayleigh angle of ∼22 . In this study, we designed and manufactured thin-film SAW devices by depositing ZnO films on different substrates (including silicon and aluminium) to realize a wide range of jetting angles from ∼16 to 55 using propagating waves generated from one interdigital transducer. We then systematically investigated different factors affecting the jetting angles, including liquid properties, applied SAW power and SAW device resonant frequency. Finally, we proposed various methods using thin-film SAW devices together with different transducer designs for realizing a wide range of jetting angles within the 3D domain. A nozzleless jetting method is proposed using thin-film based surface acoustic wave devices to achieve a wide range of jetting angles for droplets.

Original languageEnglish
Article number355402
Number of pages12
JournalJournal of Physics D: Applied Physics
Issue number35
Early online date17 Jun 2020
Publication statusPublished - 26 Aug 2020


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