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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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Publication details

The article was received on 16 Sep 2014, accepted on 04 Nov 2014 and first published on 04 Nov 2014


Article type: Paper
DOI: 10.1039/C4RA13002B
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Citation: RSC Adv., 2014,4, 60534-60542
  • Open access: Creative Commons BY-NC license
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    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

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