Acoustic Tweezing and Patterning of Concentration Fields in Microfluidics

Jonas Tobias Karlsen, Henrik Bruus

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Abstract

We demonstrate theoretically that acoustic forces acting on inhomogeneous fluids can be used to pattern and manipulate solute concentration fields into spatiotemporally controllable configurations stabilized against gravity. A theoretical framework describing the dynamics of concentration fields that weakly perturb the fluid density and speed of sound is presented and applied to study manipulation of concentration fields in rectangular-channel acoustic eigenmodes and in Bessel-function acoustic vortices. In the first example, methods to obtain horizontal and vertical multilayer stratification of the concentration field at the end of a flow-through channel are presented. In the second example, we demonstrate acoustic tweezing and spatiotemporal manipulation of a local high-concentration region in a lower-concentration medium, thereby extending the realm of acoustic tweezing to include concentration fields.
Original languageEnglish
Article number034017
JournalPhysical Review Applied
Volume7
Issue number3
Number of pages10
ISSN2331-7019
DOIs
Publication statusPublished - 2017

Cite this

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title = "Acoustic Tweezing and Patterning of Concentration Fields in Microfluidics",
abstract = "We demonstrate theoretically that acoustic forces acting on inhomogeneous fluids can be used to pattern and manipulate solute concentration fields into spatiotemporally controllable configurations stabilized against gravity. A theoretical framework describing the dynamics of concentration fields that weakly perturb the fluid density and speed of sound is presented and applied to study manipulation of concentration fields in rectangular-channel acoustic eigenmodes and in Bessel-function acoustic vortices. In the first example, methods to obtain horizontal and vertical multilayer stratification of the concentration field at the end of a flow-through channel are presented. In the second example, we demonstrate acoustic tweezing and spatiotemporal manipulation of a local high-concentration region in a lower-concentration medium, thereby extending the realm of acoustic tweezing to include concentration fields.",
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language = "English",
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Acoustic Tweezing and Patterning of Concentration Fields in Microfluidics. / Karlsen, Jonas Tobias; Bruus, Henrik.

In: Physical Review Applied, Vol. 7, No. 3, 034017 , 2017.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Acoustic Tweezing and Patterning of Concentration Fields in Microfluidics

AU - Karlsen, Jonas Tobias

AU - Bruus, Henrik

PY - 2017

Y1 - 2017

N2 - We demonstrate theoretically that acoustic forces acting on inhomogeneous fluids can be used to pattern and manipulate solute concentration fields into spatiotemporally controllable configurations stabilized against gravity. A theoretical framework describing the dynamics of concentration fields that weakly perturb the fluid density and speed of sound is presented and applied to study manipulation of concentration fields in rectangular-channel acoustic eigenmodes and in Bessel-function acoustic vortices. In the first example, methods to obtain horizontal and vertical multilayer stratification of the concentration field at the end of a flow-through channel are presented. In the second example, we demonstrate acoustic tweezing and spatiotemporal manipulation of a local high-concentration region in a lower-concentration medium, thereby extending the realm of acoustic tweezing to include concentration fields.

AB - We demonstrate theoretically that acoustic forces acting on inhomogeneous fluids can be used to pattern and manipulate solute concentration fields into spatiotemporally controllable configurations stabilized against gravity. A theoretical framework describing the dynamics of concentration fields that weakly perturb the fluid density and speed of sound is presented and applied to study manipulation of concentration fields in rectangular-channel acoustic eigenmodes and in Bessel-function acoustic vortices. In the first example, methods to obtain horizontal and vertical multilayer stratification of the concentration field at the end of a flow-through channel are presented. In the second example, we demonstrate acoustic tweezing and spatiotemporal manipulation of a local high-concentration region in a lower-concentration medium, thereby extending the realm of acoustic tweezing to include concentration fields.

U2 - 10.1103/PhysRevApplied.7.034017

DO - 10.1103/PhysRevApplied.7.034017

M3 - Journal article

VL - 7

JO - Physical Review Applied

JF - Physical Review Applied

SN - 2331-7019

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