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An electrochemical and high-speed imaging study of micropore decontamination by acoustic bubble entrapment

An electrochemical and high-speed imaging study of micropore decontamination by acoustic bubble entrapment
An electrochemical and high-speed imaging study of micropore decontamination by acoustic bubble entrapment
Electrochemical and high-speed imaging techniques are used to study the abilities of ultrasonically-activated bubbles to clean out micropores. Cylindrical pores with dimensions (diameter × depth) of 500 ?m × 400 ?m (aspect ratio 0.8), 125 ?m × 350 ?m (aspect ratio 2.8) and 50 ?m × 200 ?m (aspect ratio 4.0) are fabricated in glass substrates. Each pore is contaminated by filling it with an electrochemically inactive blocking organic material (thickened methyl salicylate) before the substrate is placed in a solution containing an electroactive species (Fe(CN)6(3-)). An electrode is fabricated at the base of each pore and the Faradaic current is used to monitor the decontamination as a function of time. For the largest pore, decontamination driven by ultrasound (generated by a horn type transducer) and bulk fluid flow are compared. It is shown that ultrasound is much more effective than flow alone, and that bulk fluid flow at the rates used cannot decontaminate the pore completely, but that ultrasound can. In the case of the 125 ?m pore, high-speed imaging is used to elucidate the cleaning mechanisms involved in ultrasonic decontamination and reveals that acoustic bubble entrapment is a key feature. The smallest pore is used to explore the limits of decontamination and it is found that ultrasound is still effective at this size under the conditions employed.
1463-9076
4982-4989
Offin, Douglas G.
e7cbc36d-c3ae-431b-9f7a-8c38ccb53579
Birkin, Peter R.
ba466560-f27c-418d-89fc-67ea4f81d0a7
Leighton, Timothy G.
3e5262ce-1d7d-42eb-b013-fcc5c286bbae
Offin, Douglas G.
e7cbc36d-c3ae-431b-9f7a-8c38ccb53579
Birkin, Peter R.
ba466560-f27c-418d-89fc-67ea4f81d0a7
Leighton, Timothy G.
3e5262ce-1d7d-42eb-b013-fcc5c286bbae

Offin, Douglas G., Birkin, Peter R. and Leighton, Timothy G. (2014) An electrochemical and high-speed imaging study of micropore decontamination by acoustic bubble entrapment. Physical Chemistry Chemical Physics, 16 (10), 4982-4989. (doi:10.1039/C3CP55088E). (PMID:24477554)

Record type: Article

Abstract

Electrochemical and high-speed imaging techniques are used to study the abilities of ultrasonically-activated bubbles to clean out micropores. Cylindrical pores with dimensions (diameter × depth) of 500 ?m × 400 ?m (aspect ratio 0.8), 125 ?m × 350 ?m (aspect ratio 2.8) and 50 ?m × 200 ?m (aspect ratio 4.0) are fabricated in glass substrates. Each pore is contaminated by filling it with an electrochemically inactive blocking organic material (thickened methyl salicylate) before the substrate is placed in a solution containing an electroactive species (Fe(CN)6(3-)). An electrode is fabricated at the base of each pore and the Faradaic current is used to monitor the decontamination as a function of time. For the largest pore, decontamination driven by ultrasound (generated by a horn type transducer) and bulk fluid flow are compared. It is shown that ultrasound is much more effective than flow alone, and that bulk fluid flow at the rates used cannot decontaminate the pore completely, but that ultrasound can. In the case of the 125 ?m pore, high-speed imaging is used to elucidate the cleaning mechanisms involved in ultrasonic decontamination and reveals that acoustic bubble entrapment is a key feature. The smallest pore is used to explore the limits of decontamination and it is found that ultrasound is still effective at this size under the conditions employed.

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e-pub ahead of print date: 21 January 2014
Published date: 14 March 2014
Organisations: Inst. Sound & Vibration Research, Electrochemistry, National Oceanography Centre

Identifiers

Local EPrints ID: 365302
URI: http://eprints.soton.ac.uk/id/eprint/365302
ISSN: 1463-9076
PURE UUID: 7a1f6c57-9627-454f-b4bd-07a8a96ed2f6
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: 30 May 2014 10:29
Last modified: 17 Dec 2019 02:00

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