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Microparticle acoustophoresis in aluminum-based acoustofluidic devices with PDMS covers

Bodé, William Naundrup ; Jiang, Lei LU ; Laurell, Thomas LU and Bruus, Henrik (2020) In Micromachines 11(3).
Abstract

We present a numerical model for the recently introduced simple and inexpensive micromachined aluminum devices with a polydimethylsiloxane (PDMS) cover for microparticle acoustophoresis. We validate the model experimentally for a basic design, where a microchannel is milled into the surface of an aluminum substrate, sealed with a PDMS cover, and driven at MHz frequencies by a piezoelectric lead-zirconate-titanate (PZT) transducer. Both experimentally and numerically we find that the soft PDMS cover suppresses the Rayleigh streaming rolls in the bulk. However, due to the low transverse speed of sound in PDMS, such devices are prone to exhibit acoustic streaming vortices in the corners with a relatively large velocity. We predict... (More)

We present a numerical model for the recently introduced simple and inexpensive micromachined aluminum devices with a polydimethylsiloxane (PDMS) cover for microparticle acoustophoresis. We validate the model experimentally for a basic design, where a microchannel is milled into the surface of an aluminum substrate, sealed with a PDMS cover, and driven at MHz frequencies by a piezoelectric lead-zirconate-titanate (PZT) transducer. Both experimentally and numerically we find that the soft PDMS cover suppresses the Rayleigh streaming rolls in the bulk. However, due to the low transverse speed of sound in PDMS, such devices are prone to exhibit acoustic streaming vortices in the corners with a relatively large velocity. We predict numerically that in devices, where the microchannel is milled all the way through the aluminum substrate and sealed with a PDMS cover on both the top and bottom, the Rayleigh streaming is suppressed in the bulk thus enabling focusing of sub-micrometer-sized particles.

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author
; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Acoustofluidics, Aluminum microdevices, Microparticle acoustophoresis, Numerical modeling, Polydimethylsiloxane (PDMS) covers
in
Micromachines
volume
11
issue
3
article number
292
publisher
Multidisciplinary Digital Publishing Institute (MDPI)
external identifiers
  • pmid:32168805
  • scopus:85082884106
ISSN
2072-666X
DOI
10.3390/mi11030292
language
English
LU publication?
yes
id
33a255e5-6138-46b3-a4bb-62260c0e62f9
date added to LUP
2021-01-05 11:04:23
date last changed
2021-04-27 03:49:53
@article{33a255e5-6138-46b3-a4bb-62260c0e62f9,
  abstract     = {<p>We present a numerical model for the recently introduced simple and inexpensive micromachined aluminum devices with a polydimethylsiloxane (PDMS) cover for microparticle acoustophoresis. We validate the model experimentally for a basic design, where a microchannel is milled into the surface of an aluminum substrate, sealed with a PDMS cover, and driven at MHz frequencies by a piezoelectric lead-zirconate-titanate (PZT) transducer. Both experimentally and numerically we find that the soft PDMS cover suppresses the Rayleigh streaming rolls in the bulk. However, due to the low transverse speed of sound in PDMS, such devices are prone to exhibit acoustic streaming vortices in the corners with a relatively large velocity. We predict numerically that in devices, where the microchannel is milled all the way through the aluminum substrate and sealed with a PDMS cover on both the top and bottom, the Rayleigh streaming is suppressed in the bulk thus enabling focusing of sub-micrometer-sized particles.</p>},
  author       = {Bodé, William Naundrup and Jiang, Lei and Laurell, Thomas and Bruus, Henrik},
  issn         = {2072-666X},
  language     = {eng},
  number       = {3},
  publisher    = {Multidisciplinary Digital Publishing Institute (MDPI)},
  series       = {Micromachines},
  title        = {Microparticle acoustophoresis in aluminum-based acoustofluidic devices with PDMS covers},
  url          = {http://dx.doi.org/10.3390/mi11030292},
  doi          = {10.3390/mi11030292},
  volume       = {11},
  year         = {2020},
}