The University of Southampton
University of Southampton Institutional Repository

Preparation of glass nanopores for the coulter counting of transient nanobubbles

Preparation of glass nanopores for the coulter counting of transient nanobubbles
Preparation of glass nanopores for the coulter counting of transient nanobubbles
Conventional characterisation techniques have so far provided insufficient explanations for the existence of bulk nanobubbles. This thesis proposes an alternative Coulter counting approach that has not yet been applied to nanobubbles and could help elucidate the reasons for their stability. The work herein details the procedure used to obtain glass nanopores and to apply them to the Coulter counting of ultrasonically generated bulk nanobubbles. Tungsten nanoelectrodes are prepared from the electrochemical etching of microwires and the electrochemistry of tungsten is explored in order to characterise and size these electrodes. Nanoelectrodes prepared in this fashion give reproducible diameters of ≈ 100 nm and show electrochemical traits similar to those seen with microelectrodes. Chemical etching of the nanoelectrodes yields glass nanopores that are sized and compared to the nanoelectrodes using voltammetry, simulations, and the Coulter counting of polystyrene nanoparticles. Using a unique differential approach, the sensitivity of the Coulter counting apparatus is shown to increase dramatically. Nanopores are then used to detect and size the transient bulk nanobubbles that are generated during the ultrasonication of potassium chloride solutions with a piston-like emitter. These nanobubbles are distinguished apart from nanoparticles, which are detected in the absence of a local acoustic environment, and microbubbles, which are shown to oscillate in the presence of a local acoustic environment.
University of Southampton
Linfield, Steven
0c96c9cf-24f8-4729-b635-15deb2d26e9c
Linfield, Steven
0c96c9cf-24f8-4729-b635-15deb2d26e9c
Denuault, Guy
5c76e69f-e04e-4be5-83c5-e729887ffd4e

Linfield, Steven (2020) Preparation of glass nanopores for the coulter counting of transient nanobubbles. Doctoral Thesis, 249pp.

Record type: Thesis (Doctoral)

Abstract

Conventional characterisation techniques have so far provided insufficient explanations for the existence of bulk nanobubbles. This thesis proposes an alternative Coulter counting approach that has not yet been applied to nanobubbles and could help elucidate the reasons for their stability. The work herein details the procedure used to obtain glass nanopores and to apply them to the Coulter counting of ultrasonically generated bulk nanobubbles. Tungsten nanoelectrodes are prepared from the electrochemical etching of microwires and the electrochemistry of tungsten is explored in order to characterise and size these electrodes. Nanoelectrodes prepared in this fashion give reproducible diameters of ≈ 100 nm and show electrochemical traits similar to those seen with microelectrodes. Chemical etching of the nanoelectrodes yields glass nanopores that are sized and compared to the nanoelectrodes using voltammetry, simulations, and the Coulter counting of polystyrene nanoparticles. Using a unique differential approach, the sensitivity of the Coulter counting apparatus is shown to increase dramatically. Nanopores are then used to detect and size the transient bulk nanobubbles that are generated during the ultrasonication of potassium chloride solutions with a piston-like emitter. These nanobubbles are distinguished apart from nanoparticles, which are detected in the absence of a local acoustic environment, and microbubbles, which are shown to oscillate in the presence of a local acoustic environment.

Text
2019_Steven Linfield_PhD Thesis Final
Restricted to Repository staff only until 24 June 2021.
Available under License University of Southampton Thesis Licence.
Text
Permission to deposit _STEVEN LINFIELD - signed
Restricted to Repository staff only

More information

Published date: January 2020

Identifiers

Local EPrints ID: 447585
URI: http://eprints.soton.ac.uk/id/eprint/447585
PURE UUID: 8b13a1f3-b566-4d04-8fb7-8d8d11034ec8
ORCID for Guy Denuault: ORCID iD orcid.org/0000-0002-8630-9492

Catalogue record

Date deposited: 16 Mar 2021 17:45
Last modified: 17 Mar 2021 02:34

Export record

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×