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, Des Gibson, Chen Fu, Jingting Luo, Dong Linxi, Jin Xie, Yong Qing (Richard) Fu

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)
48 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 ~22o. 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 ~16o to 55o using propagating waves generated from one interdigital transducer (IDT). 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.
Original languageEnglish
Article number355402
Number of pages12
JournalJournal of Physics D: Applied Physics
Issue number35
Early online date1 May 2020
Publication statusPublished - 17 Jun 2020


  • Surface acoustic wave
  • Jetting angle
  • Rayleigh angle
  • Thin films
  • Droplet ejection


Dive into the research topics of 'Wide range of droplet jetting angles by thin-film based surface acoustic waves'. Together they form a unique fingerprint.

Cite this