Issue 1, 2017

Acoustofluidic particle trapping, manipulation, and release using dynamic-mode cantilever sensors

Abstract

We show here that dynamic-mode cantilever sensors enable acoustofluidic fluid mixing and trapping of suspended particles as well as the rapid manipulation and release of trapped micro-particles via mode switching in liquid. Resonant modes of piezoelectric cantilever sensors over the 0 to 8 MHz frequency range are investigated. Sensor impedance response, flow visualization studies using dye and micro-particle tracers (100 μm diameter), and finite element simulations of cantilever modal mechanics and acoustic streaming show fluid mixing and particle trapping configurations depend on the resonant mode shape. We found trapped particles could be: (1) rapidly manipulated on millimeter length scales, and (2) released from the cantilever surface after trapping by switching between low- and high-order resonant modes (less than 250 kHz and greater than 1 MHz, respectively). Such results suggest a potentially promising future for dynamic-mode cantilevers in separations, pumping and mixing applications as well as acoustofluidic-enhanced sensing applications.

Graphical abstract: Acoustofluidic particle trapping, manipulation, and release using dynamic-mode cantilever sensors

Supplementary files

Article information

Article type
Paper
Submitted
02 Aug 2016
Accepted
14 Nov 2016
First published
23 Nov 2016
This article is Open Access
Creative Commons BY-NC license

Analyst, 2017,142, 123-131

Acoustofluidic particle trapping, manipulation, and release using dynamic-mode cantilever sensors

B. N. Johnson and R. Mutharasan, Analyst, 2017, 142, 123 DOI: 10.1039/C6AN01743F

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