The University of Southampton
University of Southampton Institutional Repository

Ruthenium dioxide thick film pH electrodes

Mihell, John Alexander (1997) Ruthenium dioxide thick film pH electrodes University of Southampton, School of Engineering Sciences, Doctoral Thesis .

Record type: Thesis (Doctoral)

Abstract

PH sensitive electrodes have been fabricated using thick film screen printing techniques. Powdered ruthenium dioxide hydrate was incorporated in a printable paste by mixing with an uncured polymer precursor. This paste was printed onto alumina tiles which had been previously patterned with conductive tracking which enabled connection to measurement circuitry. The liquid polymer was cured to a resistant solid using either temperature or ultraviolet light treatments. Large numbers of electrodes were fabricated in this way, using ruthenium dioxide with varying levels of hydration.
Printed electrodes were tested for pH response using a number of fixed pH buffers. A commercial silver/silver chloride reference electrode was used to complete the potentiometric measurement cell. The response of electrodes was found to be comparable to that of commercial electrodes based upon a pH sensitive glass bulb. Electrodes were tested after prolonged soaking in various solutions, both acidic and alkali. Some types of printed electrode showed signs of chemical attack and failure after storage in acidic media. Charge was passed through electrodes to investigate the possible perturbation of electrochemical equilibria within the oxide.
Electrodes were characterised by microscope examination of used and unused samples. The hydration level of the oxide powders used was investigated using thermogravimetric analysis techniques.
The electrochemical mechanisms underlying the potentiometric pH response are speculated upon. The experimental evidence could indicate that an ion exchange mechanism involving hydroxide groups on the oxide surface is responsible for pH sensitivity. Results are discussed with respect to this and other mechanisms.

Full text not available from this repository.

More information

Published date: 1997
Organisations: University of Southampton

Identifiers

Local EPrints ID: 47133
URI: http://eprints.soton.ac.uk/id/eprint/47133
PURE UUID: bb54db1e-9a62-4be9-af77-68947e138429

Catalogue record

Date deposited: 16 Aug 2007
Last modified: 17 Jul 2017 15:04

Export record

Contributors

Author: John Alexander Mihell

University divisions

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.

×