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Surface acoustic wave induced particle manipulation in a PDMS channel-principle concepts for continuous flow applications
KTH, School of Engineering Sciences (SCI), Applied Physics.
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2012 (English)In: Biomedical microdevices (Print), ISSN 1387-2176, E-ISSN 1572-8781, Vol. 14, no 2, 279-289 p.Article in journal (Refereed) Published
Abstract [en]

A device for acoustic particle manipulation in the 40 MHz range for continuous-flow operation in a 50 ÎŒm wide PDMS channel has been evaluated. Unidirectional interdigital transducers on a Y-cut Z-propagation lithium nixobate wafer were used to excite a surface acoustic wave that generated an acoustic standing wave inside the microfluidic channel. It was shown that particle alignment nodes with different inter-node spacing could be obtained, depending on device design and driving frequency. The observed inter-node spacing differed from the standard halfwavelength inter-node spacing generally employed in bulk acoustic transducer excited resonant systems. This effect and the related issue of acoustic node positions relative the channel walls, which is fundamental for most continuous flow particle manipulation operations in channels, was evaluated in measurements and simulations. Specific applications of particle separation and alignment where these systems can offer benefits relative state-of the art designs were identified.

Place, publisher, year, edition, pages
2012. Vol. 14, no 2, 279-289 p.
Keyword [en]
Acoustic particle manipulation, Particle alignment, PDMS, Surface acoustic wave, Ultrasound
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URN: urn:nbn:se:kth:diva-98429DOI: 10.1007/s10544-011-9606-7ISI: 000301544500004Scopus ID: 2-s2.0-84861461686OAI: oai:DiVA.org:kth-98429DiVA: diva2:537585
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QC 20120627

Available from: 2012-06-27 Created: 2012-06-26 Last updated: 2017-06-19Bibliographically approved

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