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Surface acoustic wave controlled integrated band-pass filter

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Abstract

We introduce a microfluidic band-pass filter for particles that is fully integrated in a polydimethylsiloxane-based microchannel device. This acoustic filter allows a continuous and label-free separation of particles. To demonstrate the functionality, mixtures of particles with different sizes are exposed to propagating surface acoustic waves generated by two laterally displaced interdigitated transducers, one on each side of the microchannel. Dependent on the frequency used, a specific size or even a size range of particles can be extracted. We sort particles of sizes of ~1–10 µm and estimate the size resolution to be smaller than ∆r < 0.88 µm. We examine the performance of the device and achieve a throughput of ~105 particles/s with an efficiency as high as 99 %.

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Acknowledgments

The authors thank Achim Wixforth for support and acknowledge support by the Center for NanoScience (CeNS). V. S. and R. R. thank Lothar Schmid and Thomas Geislinger for discussions. T. F. thanks the German Research Foundation (DFG) for financial support via priority programs and research grants. R. R. and T. F. acknowledge support by the “Bayerisches Staatsministerium für Umwelt und Verbraucherschutz”.

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Authors and Affiliations

  1. Experimentalphysik I, Soft Matter Group, University of Augsburg, Universitätsstr. 1, 86159, Augsburg, Germany

    Viktor Skowronek, Richard W. Rambach & Thomas Franke

  2. School of Engineering, Chair of Biomedical Engineering, University of Glasgow, Rankine Building, Oakfield Avenue, Glasgow, G12 8LT, UK

    Thomas Franke

Authors
  1. Viktor Skowronek
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  2. Richard W. Rambach
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  3. Thomas Franke
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Correspondence to Thomas Franke.

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Skowronek, V., Rambach, R.W. & Franke, T. Surface acoustic wave controlled integrated band-pass filter. Microfluid Nanofluid 19, 335–341 (2015). https://doi.org/10.1007/s10404-015-1559-3

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  • DOI: https://doi.org/10.1007/s10404-015-1559-3

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