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Generation and in situ electrochemical detection of transient nanobubbles

Generation and in situ electrochemical detection of transient nanobubbles
Generation and in situ electrochemical detection of transient nanobubbles
Nanobubbles are fascinating but controversial objects. Although there is strong evidence for the existence of surface bound nano-bubbles, the possibility of stable nanobubbles in the bulk remains in question. In this work, we show how ultrasonication of electrolytes can create transient bulk nanobubbles. To do this, glass nanopores are used as Coulter counters in order to detect nanobubbles. During ultrasonication, these transient bulk nanobubbles are shown to exist in relatively high concentrations while bubble activity on the surface of a solid media close to the pore is driven by ultrasound. However, the transient nature of these bubbles is evident upon termination of the ultrasonic source. High-speed imaging suggests that these transient nanobubbles originate from the fragmentation of larger bubbles, which skate over the surface of the structure in the acoustic field present. Transient nanobubbles as small as ~100 nm diameter are detected. In contrast to previous work with microbubbles, no evidence for the oscillation of these nanobubbles during translocation was found. The novel experimental approach presented here provides strong evidence for the existence of transient nanobubbles in bulk solution.
acoustic cavitation, bubble fragmentation, nanopore detection, transient bulk nanobubbles
1932-7447
7544-7549
Birkin, Peter R.
ba466560-f27c-418d-89fc-67ea4f81d0a7
Linfield, Steven
0c96c9cf-24f8-4729-b635-15deb2d26e9c
Youngs, Jack
bdc2f78f-ae97-4faf-8930-1970ca697867
Denuault, Guy
5c76e69f-e04e-4be5-83c5-e729887ffd4e
Birkin, Peter R.
ba466560-f27c-418d-89fc-67ea4f81d0a7
Linfield, Steven
0c96c9cf-24f8-4729-b635-15deb2d26e9c
Youngs, Jack
bdc2f78f-ae97-4faf-8930-1970ca697867
Denuault, Guy
5c76e69f-e04e-4be5-83c5-e729887ffd4e

Birkin, Peter R., Linfield, Steven, Youngs, Jack and Denuault, Guy (2020) Generation and in situ electrochemical detection of transient nanobubbles. The Journal of Physical Chemistry C, 124 (13), 7544-7549. (doi:10.1021/acs.jpcc.0c00435).

Record type: Article

Abstract

Nanobubbles are fascinating but controversial objects. Although there is strong evidence for the existence of surface bound nano-bubbles, the possibility of stable nanobubbles in the bulk remains in question. In this work, we show how ultrasonication of electrolytes can create transient bulk nanobubbles. To do this, glass nanopores are used as Coulter counters in order to detect nanobubbles. During ultrasonication, these transient bulk nanobubbles are shown to exist in relatively high concentrations while bubble activity on the surface of a solid media close to the pore is driven by ultrasound. However, the transient nature of these bubbles is evident upon termination of the ultrasonic source. High-speed imaging suggests that these transient nanobubbles originate from the fragmentation of larger bubbles, which skate over the surface of the structure in the acoustic field present. Transient nanobubbles as small as ~100 nm diameter are detected. In contrast to previous work with microbubbles, no evidence for the oscillation of these nanobubbles during translocation was found. The novel experimental approach presented here provides strong evidence for the existence of transient nanobubbles in bulk solution.

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Birkin Nanobubble Main revised for Pure - Accepted Manuscript
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More information

Accepted/In Press date: 19 March 2020
e-pub ahead of print date: 19 March 2020
Published date: 2 April 2020
Keywords: acoustic cavitation, bubble fragmentation, nanopore detection, transient bulk nanobubbles

Identifiers

Local EPrints ID: 439358
URI: http://eprints.soton.ac.uk/id/eprint/439358
ISSN: 1932-7447
PURE UUID: 5de15ff1-333b-4342-ad49-f6bc527b8f12
ORCID for Peter R. Birkin: ORCID iD orcid.org/0000-0002-6656-4074
ORCID for Guy Denuault: ORCID iD orcid.org/0000-0002-8630-9492

Catalogue record

Date deposited: 17 Apr 2020 16:30
Last modified: 19 Mar 2021 05:01

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