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Microsecond resolution of cavitation bubble dynamics using a high-speed electrochemical impedance approach

Microsecond resolution of cavitation bubble dynamics using a high-speed electrochemical impedance approach
Microsecond resolution of cavitation bubble dynamics using a high-speed electrochemical impedance approach
A new method to detect the uncompensated resistance, the capacitance and the Faradaic current at an electrode exposed to ultrasonic cavitation is presented. The method enables these parameters to be resolved with a 2 microsecond resolution and relies on the detection of the impedance of an electrode recorded as a function of time with a suitable AC excitation signal (here 500 kHz). Data obtained from an aluminium electrode, held under potentiostatic control, is used to illustrate the technique with particular relevance to the effects of cavitation bubbles generated by ultrasound. Analysis of the data recorded shows that the cavitation bubbles form close to the surface of the electrode and collapse, causing damage to the passive film formed at the aluminium surface. The capacitance, uncompensated resistance and Faradaic signals are used to explore the dynamic processes and show expansion and collapse of bubbles prior to erosion/corrosion. The close proximity of the bubbles to the surface is deduced from the reductions in capacitance and increases in resistance prior to bubble collapse, which is then shown to trigger the onset of a Faradaic signal, thus confirming the erosion/corrosion mechanism previously assumed.
1359-7345
11406-11409
Birkin, Peter
ba466560-f27c-418d-89fc-67ea4f81d0a7
Foley, Thomas
bdc48726-5ece-4851-a8cc-2d05577d3189
Barber, Jennifer
39b1337b-1726-48fb-a371-8e074fc7b8f0
Martin, Hannah
0ad9ec1c-5e2e-419d-8602-6b3eaccaa65a
Birkin, Peter
ba466560-f27c-418d-89fc-67ea4f81d0a7
Foley, Thomas
bdc48726-5ece-4851-a8cc-2d05577d3189
Barber, Jennifer
39b1337b-1726-48fb-a371-8e074fc7b8f0
Martin, Hannah
0ad9ec1c-5e2e-419d-8602-6b3eaccaa65a

Birkin, Peter, Foley, Thomas, Barber, Jennifer and Martin, Hannah (2016) Microsecond resolution of cavitation bubble dynamics using a high-speed electrochemical impedance approach. Chemical Communications, 52 (76), 11406-11409. (doi:10.1039/C6CC06006D).

Record type: Article

Abstract

A new method to detect the uncompensated resistance, the capacitance and the Faradaic current at an electrode exposed to ultrasonic cavitation is presented. The method enables these parameters to be resolved with a 2 microsecond resolution and relies on the detection of the impedance of an electrode recorded as a function of time with a suitable AC excitation signal (here 500 kHz). Data obtained from an aluminium electrode, held under potentiostatic control, is used to illustrate the technique with particular relevance to the effects of cavitation bubbles generated by ultrasound. Analysis of the data recorded shows that the cavitation bubbles form close to the surface of the electrode and collapse, causing damage to the passive film formed at the aluminium surface. The capacitance, uncompensated resistance and Faradaic signals are used to explore the dynamic processes and show expansion and collapse of bubbles prior to erosion/corrosion. The close proximity of the bubbles to the surface is deduced from the reductions in capacitance and increases in resistance prior to bubble collapse, which is then shown to trigger the onset of a Faradaic signal, thus confirming the erosion/corrosion mechanism previously assumed.

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Chem comm microsecond cavitation Birkin et al revised.pdf - Accepted Manuscript
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More information

Accepted/In Press date: 26 August 2016
e-pub ahead of print date: 1 September 2016
Published date: 1 October 2016
Organisations: Computational Systems Chemistry

Identifiers

Local EPrints ID: 402242
URI: http://eprints.soton.ac.uk/id/eprint/402242
ISSN: 1359-7345
PURE UUID: 7ab6c072-08e9-491c-a753-863338851589
ORCID for Peter Birkin: ORCID iD orcid.org/0000-0002-6656-4074

Catalogue record

Date deposited: 03 Nov 2016 16:30
Last modified: 01 Apr 2020 04:01

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Contributors

Author: Peter Birkin ORCID iD
Author: Thomas Foley
Author: Jennifer Barber
Author: Hannah Martin

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