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Cavitation, shock waves and the invasive nature of sonoelectrochemistry

Cavitation, shock waves and the invasive nature of sonoelectrochemistry
Cavitation, shock waves and the invasive nature of sonoelectrochemistry
The invasive nature of electrodes placed into sound fields is examined. In particular, perturbations of the sound field due to the presence of the electrode support are explored. The effect of an electrode on the drive sound field (at ~23 kHz) is shown to be negligible under the conditions investigated in this paper. However, scattering of shock waves produced by cavity collapse is shown to exhibit a significant effect. To demonstrate this, multibubble sonoluminescence (MBSL) and electrochemical erosion measurements are employed. These measurements show an enhancement, due to the reflection by the solid/liquid boundary at the electrode support, of pressure pulses emitted when cavitation bubbles collapse.
To first order, this effect can be accounted for by a correction factor. However, this factor requires accurate knowledge of the acoustic impedance of the interface and the electrolyte media. These are measured for two commonly employed substrates (soda glass and epoxy resin, specifically Epofix). A scattering model is developed which is able to predict the acoustic pressure as a function of position over a disk-like electrode substrate. The effects of shock wave reflection and materials employed in the electrode construction are used to clarify the interpretation of the results obtained from different sonoelectrochemical experiments. Given the widespread experimentation involving the insertion of electrodes (or other sensors) into ultrasonic fields, this work represents a significant development to aid the interpretation of the results obtained.
1520-5207
16997-17005
Birkin, Peter R.
ba466560-f27c-418d-89fc-67ea4f81d0a7
Offin, Douglas G.
e7cbc36d-c3ae-431b-9f7a-8c38ccb53579
Joseph, Phillip F.
9c30491e-8464-4c9a-8723-2abc62bdf75d
Leighton, Timothy G.
3e5262ce-1d7d-42eb-b013-fcc5c286bbae
Birkin, Peter R.
ba466560-f27c-418d-89fc-67ea4f81d0a7
Offin, Douglas G.
e7cbc36d-c3ae-431b-9f7a-8c38ccb53579
Joseph, Phillip F.
9c30491e-8464-4c9a-8723-2abc62bdf75d
Leighton, Timothy G.
3e5262ce-1d7d-42eb-b013-fcc5c286bbae

Birkin, Peter R., Offin, Douglas G., Joseph, Phillip F. and Leighton, Timothy G. (2005) Cavitation, shock waves and the invasive nature of sonoelectrochemistry. The Journal of Physical Chemistry B, 109 (35), 16997-17005. (doi:10.1021/jp051619w).

Record type: Article

Abstract

The invasive nature of electrodes placed into sound fields is examined. In particular, perturbations of the sound field due to the presence of the electrode support are explored. The effect of an electrode on the drive sound field (at ~23 kHz) is shown to be negligible under the conditions investigated in this paper. However, scattering of shock waves produced by cavity collapse is shown to exhibit a significant effect. To demonstrate this, multibubble sonoluminescence (MBSL) and electrochemical erosion measurements are employed. These measurements show an enhancement, due to the reflection by the solid/liquid boundary at the electrode support, of pressure pulses emitted when cavitation bubbles collapse.
To first order, this effect can be accounted for by a correction factor. However, this factor requires accurate knowledge of the acoustic impedance of the interface and the electrolyte media. These are measured for two commonly employed substrates (soda glass and epoxy resin, specifically Epofix). A scattering model is developed which is able to predict the acoustic pressure as a function of position over a disk-like electrode substrate. The effects of shock wave reflection and materials employed in the electrode construction are used to clarify the interpretation of the results obtained from different sonoelectrochemical experiments. Given the widespread experimentation involving the insertion of electrodes (or other sensors) into ultrasonic fields, this work represents a significant development to aid the interpretation of the results obtained.

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Published date: 8 September 2005

Identifiers

Local EPrints ID: 28419
URI: https://eprints.soton.ac.uk/id/eprint/28419
ISSN: 1520-5207
PURE UUID: 516b5e7f-f674-48ad-bc7c-14b06274363a
ORCID for Peter R. Birkin: ORCID iD orcid.org/0000-0002-6656-4074
ORCID for Timothy G. Leighton: ORCID iD orcid.org/0000-0002-1649-8750

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Date deposited: 02 May 2006
Last modified: 20 Jul 2019 01:21

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Contributors

Author: Peter R. Birkin ORCID iD
Author: Douglas G. Offin

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