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Surface acoustic wave-induced precise particle manipulation in a trapezoidal glass microfluidic channel
KTH, School of Engineering Sciences (SCI), Applied Physics, Biomedical and X-ray Physics.
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2012 (English)In: Journal of Micromechanics and Microengineering, ISSN 0960-1317, E-ISSN 1361-6439, Vol. 22, no 2, 025018- p.Article in journal (Refereed) Published
Abstract [en]

Surface acoustic wave (SAW) excitation of an acoustic field in a trapezoidal glass microfluidic channel for particle manipulation in continuous flow has been demonstrated. A unidirectional interdigital transducer (IDT) on a Y-cut Z-propagation lithium niobate (LiNbO3) substrate was used to excite a surface acoustic wave at approximately 35 MHz. An SU8 layer was used for adhesive bonding of the superstrate glass layer and the substrate piezoelectric layer. This work extends the use of SAWs for acoustic manipulation to also include glass channels in addition to prior work with mainly poly-di-methyl-siloxane channels. Efficient alignment of 1.9 mu m polystyrene particles to narrow nodal regions was successfully demonstrated. In addition, particle alignment with only one IDT active was realized. A finite element method simulation was used to visualize the acoustic field generated in the channel and the possibility of 2D alignment into small nodal regions was demonstrated.

Place, publisher, year, edition, pages
Institute of Physics Publishing (IOPP), 2012. Vol. 22, no 2, 025018- p.
Keyword [en]
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Engineering and Technology
URN: urn:nbn:se:kth:diva-90908DOI: 10.1088/0960-1317/22/2/025018ISI: 000299959000018ScopusID: 2-s2.0-84857935111OAI: diva2:507931
QC 20120307Available from: 2012-03-07 Created: 2012-03-05 Last updated: 2012-03-07Bibliographically approved

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