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

Li, Jie, Hosseini Biroun, Seyedmehdi, Tao, Ran, Wang, Yong, Torun, Hamdi, Xu, Na, Rahmati, Mohammad, Li, Yifan, Gibson, Des, Fu, Chen, Luo, Jingting, Linxi, Dong, Xie, Jin and Fu, Richard (2020) Wide range of droplet jetting angles by thin-film based surface acoustic waves. Journal of Physics D: Applied Physics. ISSN 0022-3727 (In Press)

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Li+et+al_2020_J._Phys._D__Appl._Phys._10.1088_1361-6463_ab8f50.pdf - Accepted Version
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Official URL: https://doi.org/10.1088/1361-6463/ab8f50

Abstract

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.

Item Type: Article
Uncontrolled Keywords: Surface acoustic wave, jetting angle, Rayleigh angle, thin films, droplet ejection.
Subjects: F200 Materials Science
F300 Physics
H800 Chemical, Process and Energy Engineering
Department: Faculties > Engineering and Environment > Mechanical and Construction Engineering
Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: Elena Carlaw
Date Deposited: 05 May 2020 10:14
Last Modified: 05 May 2020 10:20
URI: http://nrl.northumbria.ac.uk/id/eprint/43006

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