A facile and flexible method for on-demand directional speed tunability in the miniaturised lab-on-a-disc

Tan, M, Siddiqi, A and Yeo, L 2017, 'A facile and flexible method for on-demand directional speed tunability in the miniaturised lab-on-a-disc', Scientific Reports, vol. 7, no. 1, 6652, pp. 1-7.


Document type: Journal Article
Collection: Journal Articles

Title A facile and flexible method for on-demand directional speed tunability in the miniaturised lab-on-a-disc
Author(s) Tan, M
Siddiqi, A
Yeo, L
Year 2017
Journal name Scientific Reports
Volume number 7
Issue number 1
Article Number 6652
Start page 1
End page 7
Total pages 7
Publisher Nature Publishing Group
Abstract The Miniaturised Lab-on-a-Disc (miniLOAD) platform, which utilises surface acoustic waves (SAWs) to drive the rotation of thin millimeter-scale discs on which microchannels can be fabricated and hence microfluidic operations can be performed, offers the possibility of miniaturising its larger counterpart, the Lab-on-a-CD, for true portability in point-of-care applications. A significant limitation of the original miniLOAD concept, however, is that it does not allow for flexible control over the disc rotation direction and speed without manual adjustment of the disc's position, or the use of multiple devices to alter the SAW frequency. In this work, we demonstrate the possibility of achieving such control with the use of tapered interdigitated transducers to confine a SAW beam such that the localised acoustic streaming it generates imparts a force, through hydrodynamic shear, at a specific location on the disc. Varying the torque that arises as a consequence by altering the input frequency to the transducers then allows the rotational velocity and direction of the disc to be controlled with ease. We derive a simple predictive model to illustrate the principle by which this occurs, which we find agrees well with the experimental measurements.
Subject Medical Biotechnology not elsewhere classified
Acoustics and Acoustical Devices; Waves
Fluid Physics
DOI - identifier 10.1038/s41598-017-07025-x
Copyright notice © The Author(s) 2017. Creative Commons Attribution 4.0 International License
ISSN 2045-2322
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Citation counts: TR Web of Science Citation Count  Cited 6 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 1 times in Scopus Article | Citations
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