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Acoustofluidic particle steering

Acoustofluidic particle steering
Acoustofluidic particle steering
Steering micro objects using acoustic radiation forces is challenging for several reasons: resonators tend to create fixed force distributions that depend primarily on device geometry, and even when using switching schemes, the forces are hard to predict a-priori. In this paper an active approach is developed that measures forces from a range of acoustic resonances during manipulation using a computer controlled feedback loop based in MATLAB, with a microscope camera for particle imaging. The arrangement uses a planar resonator where the axial radiation force is used to hold particles within a levitation plane. Manipulation is achieved by summing the levitation frequency with an algorithmically chosen second resonance frequency, which creates lateral forces derived from gradients in the kinetic energy density of the acoustic field. Apart from identifying likely resonances, the system does not require a-priori knowledge of the structure of the acoustic force field created by each resonance. Manipulation of 10 µm microbeads is demonstrated over 100s µm. Manipulation times are of order 10 seconds for paths of 200 µm length. The microfluidic device used in this work is a rectangular glass capillary with a 6 mm wide and 300 µm high fluid chamber.
0001-4966
Shaglwf, Zaid, Ibrahim
b63f055d-ef24-4fe3-ae04-0e7b24f0f020
Hammarstrom, Bjorn
c1f33fd2-4031-4ec7-b36a-ec3aff48c164
Laila, Dina Shona
41aa5cf9-3ec2-4fdf-970d-a0a349bfd90c
Hill, Martyn
0cda65c8-a70f-476f-b126-d2c4460a253e
Glynne-Jones, Peter
6ca3fcbc-14db-4af9-83e2-cf7c8b91ef0d
Shaglwf, Zaid, Ibrahim
b63f055d-ef24-4fe3-ae04-0e7b24f0f020
Hammarstrom, Bjorn
c1f33fd2-4031-4ec7-b36a-ec3aff48c164
Laila, Dina Shona
41aa5cf9-3ec2-4fdf-970d-a0a349bfd90c
Hill, Martyn
0cda65c8-a70f-476f-b126-d2c4460a253e
Glynne-Jones, Peter
6ca3fcbc-14db-4af9-83e2-cf7c8b91ef0d

Shaglwf, Zaid, Ibrahim, Hammarstrom, Bjorn, Laila, Dina Shona, Hill, Martyn and Glynne-Jones, Peter (2019) Acoustofluidic particle steering. Journal of the Acoustical Society of America, 145 (945). (doi:10.1121/1.5090499).

Record type: Article

Abstract

Steering micro objects using acoustic radiation forces is challenging for several reasons: resonators tend to create fixed force distributions that depend primarily on device geometry, and even when using switching schemes, the forces are hard to predict a-priori. In this paper an active approach is developed that measures forces from a range of acoustic resonances during manipulation using a computer controlled feedback loop based in MATLAB, with a microscope camera for particle imaging. The arrangement uses a planar resonator where the axial radiation force is used to hold particles within a levitation plane. Manipulation is achieved by summing the levitation frequency with an algorithmically chosen second resonance frequency, which creates lateral forces derived from gradients in the kinetic energy density of the acoustic field. Apart from identifying likely resonances, the system does not require a-priori knowledge of the structure of the acoustic force field created by each resonance. Manipulation of 10 µm microbeads is demonstrated over 100s µm. Manipulation times are of order 10 seconds for paths of 200 µm length. The microfluidic device used in this work is a rectangular glass capillary with a 6 mm wide and 300 µm high fluid chamber.

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More information

Accepted/In Press date: 28 January 2019
e-pub ahead of print date: 21 February 2019

Identifiers

Local EPrints ID: 428289
URI: http://eprints.soton.ac.uk/id/eprint/428289
ISSN: 0001-4966
PURE UUID: 2b0437b1-4c51-453c-a1a3-f32dffcd8955
ORCID for Martyn Hill: ORCID iD orcid.org/0000-0001-6448-9448
ORCID for Peter Glynne-Jones: ORCID iD orcid.org/0000-0001-5684-3953

Catalogue record

Date deposited: 20 Feb 2019 17:30
Last modified: 18 Feb 2021 16:54

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