NDLI: Nebulization of water/glycerol droplets generated by ZnO/Si surface acoustic wave devices

Content Provider	Springer Nature Link
Author	Guo, Y. J. Dennison, A. P. Li, Y. Luo, J. Zu, X. T. Mackay, C. L. Langridge Smith, P. Walton, A. J. Fu, Y. Q.
Copyright Year	2014
Abstract	Efficient nebulization of liquid sessile droplets (water and water/glycerol mixtures) was investigated using standing waves generated using ZnO/Si surface acoustic wave (SAW) devices under different RF powers, frequencies and liquid viscosity (varied glycol concentrations in water). At such high RF powers, there are strong competitions between vertical jetting and nebulization. At lower SAW frequencies of 12.3 and 23.37 MHz, significant capillary waves and large satellite droplets were generated before nebulization could be observed. At frequencies between 23.37 and 37.2 MHz, spreading, displacement or occasionally jetting of the parent sessile droplet was frequently observed before a significant nebulization occurred. When the SAW frequencies were increased from 44.44 to 63.3 MHz, the minimum RF power to initiate droplet nebulization was found to increase significantly, and jetting of the parent droplet before nebulization became significant, although the average size of the nebulized particles and ejected satellite droplets appeared to decrease with an increase in frequency. With the increase of glycerol concentration in the test sessile droplets (or increase in liquid viscosity), nebulization became difficult due to the increased SAW damping rate inside the liquid. Acoustic heating effects were characterized to be insignificant and did not show apparent contributions to the nebulization process due to silicon substrate’s natural effect as an effective heat sink and the employment of a metallic holder beneath the ZnO/Si SAW device substrates.
Starting Page	273
Ending Page	282
Page Count	10
File Format	PDF
ISSN	16134982
Journal	Microfluidics and Nanofluidics
Volume Number	19
Issue Number	2
e-ISSN	16134990
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2014-10-28
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Nebulization ZnO Microfluidics Surface acoustic wave Engineering Fluid Dynamics Biomedical Engineering Analytical Chemistry Nanotechnology and Microengineering
Content Type	Text
Resource Type	Article
Subject	Nanoscience and Nanotechnology Materials Chemistry Condensed Matter Physics Electronic, Optical and Magnetic Materials

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