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Particle-size-dependent acoustophoretic motion and depletion of micro- and nano-particles at long timescales

Qiu, Wei LU ; Bruus, Henrik and Augustsson, Per LU (2020) In Physical Review E 102(1).
Abstract
We present three-dimensional measurements of particle-size-dependent acoustophoretic motion of micropar- ticles with diameters from 4.8 μm down to 0.5 μm suspended in either homogeneous or inhomogeneous fluids inside a glass-silicon microchannel and exposed to a standing ultrasound wave. To study the crossover from radiation force dominated to streaming dominated motion as the particle size is decreased, we extend previous studies to long timescales, where the particles smaller than the crossover size move over distances comparable to the channel width. We observe a particle-size-dependent particle depletion at late times for the particles smaller than the crossover size. The mechanisms behind this depletion in homogeneous fluids are... (More)
We present three-dimensional measurements of particle-size-dependent acoustophoretic motion of micropar- ticles with diameters from 4.8 μm down to 0.5 μm suspended in either homogeneous or inhomogeneous fluids inside a glass-silicon microchannel and exposed to a standing ultrasound wave. To study the crossover from radiation force dominated to streaming dominated motion as the particle size is decreased, we extend previous studies to long timescales, where the particles smaller than the crossover size move over distances comparable to the channel width. We observe a particle-size-dependent particle depletion at late times for the particles smaller than the crossover size. The mechanisms behind this depletion in homogeneous fluids are rationalized by numerical simulations which take the Brownian motion into account. Experimentally, the particle trajectories in inhomogeneous fluids show focusing in the bulk of the microchannel at early times, even for the particles below the critical size, which clearly demonstrates the potential to manipulate submicrometer particles. (Less)
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author
; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review E
volume
102
issue
1
article number
013108
pages
11 pages
publisher
American Physical Society
external identifiers
  • scopus:85089352455
  • pmid:32794927
ISSN
2470-0045
DOI
10.1103/PhysRevE.102.013108
language
English
LU publication?
yes
id
92ff1aa2-0d9f-46dd-a6e8-2254d012f61c
date added to LUP
2020-08-13 23:35:31
date last changed
2020-11-13 03:00:23
@article{92ff1aa2-0d9f-46dd-a6e8-2254d012f61c,
  abstract     = {We present three-dimensional measurements of particle-size-dependent acoustophoretic motion of micropar- ticles with diameters from 4.8 μm down to 0.5 μm suspended in either homogeneous or inhomogeneous fluids inside a glass-silicon microchannel and exposed to a standing ultrasound wave. To study the crossover from radiation force dominated to streaming dominated motion as the particle size is decreased, we extend previous studies to long timescales, where the particles smaller than the crossover size move over distances comparable to the channel width. We observe a particle-size-dependent particle depletion at late times for the particles smaller than the crossover size. The mechanisms behind this depletion in homogeneous fluids are rationalized by numerical simulations which take the Brownian motion into account. Experimentally, the particle trajectories in inhomogeneous fluids show focusing in the bulk of the microchannel at early times, even for the particles below the critical size, which clearly demonstrates the potential to manipulate submicrometer particles.},
  author       = {Qiu, Wei and Bruus, Henrik and Augustsson, Per},
  issn         = {2470-0045},
  language     = {eng},
  month        = {07},
  number       = {1},
  publisher    = {American Physical Society},
  series       = {Physical Review E},
  title        = {Particle-size-dependent acoustophoretic motion and depletion of micro- and nano-particles at long timescales},
  url          = {http://dx.doi.org/10.1103/PhysRevE.102.013108},
  doi          = {10.1103/PhysRevE.102.013108},
  volume       = {102},
  year         = {2020},
}