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Issue 105, 2014
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Localization and shaping of surface acoustic waves using PDMS posts: application for particle filtering and washing

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Abstract

We introduce a technique to control the position and effective area of the surface acoustic wave (SAW) acting on a fluid in a PDMS microchannel. The acoustic force can be localized at specific areas of the channels using a structured, ultra-thin PDMS foil beneath the microchannel. This setup enables shaping of the standing surface acoustic waves (SSAW) only by changing the geometry of the PDMS foil. In this way the effect is independent of the design of the acoustic transducer and even a single interdigitated transducer can be used to excite standing surface acoustic waves. The alignment of the assembly is very flexible allowing for different orientation of the microchannels with respect to the IDT. To demonstrate the significance and versatility of this technique we use a diagonal orientation to separate and wash particles of different size with a total deflection length of several wavelengths.

Graphical abstract: Localization and shaping of surface acoustic waves using PDMS posts: application for particle filtering and washing

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Supplementary files

Article information


Submitted
16 Sep 2014
Accepted
04 Nov 2014
First published
04 Nov 2014

This article is Open Access

RSC Adv., 2014,4, 60534-60542
Article type
Paper
Author version available

Localization and shaping of surface acoustic waves using PDMS posts: application for particle filtering and washing

R. W. Rambach, V. Skowronek and T. Franke, RSC Adv., 2014, 4, 60534
DOI: 10.1039/C4RA13002B

This article is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported Licence. Material from this article can be used in other publications provided that the correct acknowledgement is given with the reproduced material and it is not used for commercial purposes.

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    [Original citation] - Published by The Royal Society of Chemistry.

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