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Issue 23, 2020
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A two-chip acoustofluidic particle manipulation platform with a detachable and reusable surface acoustic wave device

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Abstract

This work describes a two-chip acoustofluidic platform for two-dimensional (2D) manipulation of microparticles in a closed microchamber on a reusable surface acoustic wave (SAW) device. This platform comprises two microfabricated chips: (1) a detachable silicon superstrate enclosed by a PDMS microfluidic chamber and (2) a reusable SAW device for generating standing SAW (SSAW), which is typically an expensive component. Critical to such a two-chip acoustofluidic platform is the selection of a suitable coupling agent at the interface of the SAW device and superstrate. To this end, we applied a polymer thin film as a coupling agent that balances between acoustic coupling efficiency, stability over time, and reusability. Recycling of the SAW device lowers the cost-barrier for acoustofluidic particle manipulation. The SSAW is transmitted into the silicon superstrate via the coupling agent to form a standing Lamb wave (SLW) to trap and move microparticles. The reported two-chip strategy enables the single-use microfluidic superstrates to avoid chemical and biological contaminations, while maintaining the merits of acoustofluidic manipulation of being noncontact and label-free and applicable to a wide range of microparticles with different shapes, density, polarity, and electrical properties.

Graphical abstract: A two-chip acoustofluidic particle manipulation platform with a detachable and reusable surface acoustic wave device

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Article information


Submitted
25 Jul 2020
Accepted
01 Sep 2020
First published
01 Sep 2020

Analyst, 2020,145, 7752-7758
Article type
Paper

A two-chip acoustofluidic particle manipulation platform with a detachable and reusable surface acoustic wave device

J. Qian, J. Ren, Y. Liu, R. H. W. Lam and J. E.-Y. Lee, Analyst, 2020, 145, 7752
DOI: 10.1039/D0AN01469A

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