Particle deflection in a poly(dimethylsiloxane) microchannel using a propagating surface acoustic wave: size and frequency dependence

Skowronek, V., Rambach, R. W., Schmid, L., Haase, K. and Franke, T. (2013) Particle deflection in a poly(dimethylsiloxane) microchannel using a propagating surface acoustic wave: size and frequency dependence. Analytical Chemistry, 85(20), pp. 9955-9959. (doi:10.1021/ac402607p)

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Abstract

We study the effect of a propagating surface acoustic wave (PSAW) with different frequencies on particles with different sizes in microfluidic channels. We find that the deflection critically depends on the applied frequency as well as on the particle size. For fixed frequencies, large particles are deflected and migrate perpendicular to the flow direction while smaller particles only follow the streamlines of the flow field. However, with increasing frequency of the PSAW above a size dependent limit, small particles are also actuated. This relation can be characterized by the wavenumber k and the particle radius r using the parameter κ = k · r. For the onset of deflection, we find a critical value κc ≅ 1.28 ± 0.20. Finally, we demonstrate how this device can be used for particle separation.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Franke, Professor Thomas and Schmid, Mr Lothar
Authors: Skowronek, V., Rambach, R. W., Schmid, L., Haase, K., and Franke, T.
College/School:College of Science and Engineering > School of Engineering > Biomedical Engineering
Journal Name:Analytical Chemistry
Journal Abbr.:Anal. chem.
Publisher:American Chemical Society
ISSN:0003-2700
ISSN (Online):1520-6882
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