All Outputs (72)

Thick film organic vapour sensors based on binary mixtures of metal oxides (2003)
Journal Article

Previously, composite sensors incorporating differing proportions of tin dioxide and zinc oxide were reported which exhibited high sensitivity to a range of organic vapours under dry conditions (0% relative humidity, RH). Most importantly, the compos... Read More about Thick film organic vapour sensors based on binary mixtures of metal oxides.

A prototype sensor system for the early detection of microbially linked spoilage in stored wheat grain (2003)
Journal Article

Spencer-Phillips was Co-Investigator, the lead biologist in this HGCA-funded multi-disciplinary work, and co-wrote the paper. The grant was based on his expertise in the microbiology of post-harvest spoilage.

Syntheses and polymerizations of (E)-2-styrylfurans and an investigation of their electrorheological properties (2003)
Journal Article

Novel furan compounds, which incorporate phenyl rings separated by alkene spacers, have been synthesized. Chemical polymerization of these compounds yielded black brittle powders, suspensions of which were found to exhibit significant electrorheologi... Read More about Syntheses and polymerizations of (E)-2-styrylfurans and an investigation of their electrorheological properties.

A prototype sensor system for the early detection of microbially linked spoilage in stored wheat grain (2003)
Journal Article

Sensors based on composites of metal oxides were fabricated and tested extensively under high-humidity and high-flow conditions with exposure to vapours reported to increase in the headspace of wheat grain (Triticum aestivum cv Hereward) colonized by... Read More about A prototype sensor system for the early detection of microbially linked spoilage in stored wheat grain.

Highly sensitive mixed oxide sensors for the detection of ethanol (2002)
Journal Article

Sensors consisting of mixtures of tin dioxide and zinc oxide powders in a range of proportions were constructed. Each mixture was applied to an electrode-bearing alumina substrate either as a paste, or by screen printing. The responses of these senso... Read More about Highly sensitive mixed oxide sensors for the detection of ethanol.

Experimental reaction-diffusion pre-processor for shape recognition (2002)
Journal Article

We have produced an experimental implementation of a massively-parallel reaction-diffusion processor which performs one of the most essential parts of shape recognition - construction of a skeleton. A skeleton is a unique, stable and invariant repres... Read More about Experimental reaction-diffusion pre-processor for shape recognition.

The fabrication and characterisation of a highly sensitive polypyrrole sensor and its electrical responses to amines of differing basicity at high humidities (2002)
Journal Article

Ammonia is a common feedstock for many chemical processes involving nitrogen compounds. It is a poisonous, colourless gas with a pungent smell and a fairly low odour threshold of approximately 5 ppm. The recommended threshold limit value for human ex... Read More about The fabrication and characterisation of a highly sensitive polypyrrole sensor and its electrical responses to amines of differing basicity at high humidities.

Conducting polymers as coatings: Electrochemical and density functional theory investigations of the polymerisation (2002)
Journal Article

Electroactive materials such as polypyrrole and polythiophene have many applications including their use as coatings in the metal finishing industry. Electrochemical and density functional theory (DFT) studies of a series of derivatised thiophene mol... Read More about Conducting polymers as coatings: Electrochemical and density functional theory investigations of the polymerisation.

Deposition and characterization by surface plasmon resonance of Langmuir-Blodgett monolayers of three macrocyclic conjugated tetrapyrrole compounds exposed to chlorine gas (2002)
Journal Article

Gas chromatography-mass spectrometry analyses of volatile organic compounds from potato tubers inoculated with Phytophthora infestans or Fusarium coeruleum (2001)
Journal Article

Volatile organic compounds (VOCs) collected from potato tubers inoculated with Phytophthora infestans (late blight), Fusarium coeruleum (dry rot) or sterilized distilled water (as a control) were analysed using gas chromatography-mass spectrometry (G... Read More about Gas chromatography-mass spectrometry analyses of volatile organic compounds from potato tubers inoculated with Phytophthora infestans or Fusarium coeruleum.

Ammonia vapour in the oral cavity as a diagnostic marker for infection with Helicobacter pylori: Preliminary 'proof of principle' pharmacological investigations (2001)
Journal Article

Most current non-invasive tests for Helicobacter pylori depend on the conversion of labelled (13C or 14C) urea to labelled carbon dioxide (13CO2 or 14CO2) and ammonium (NH4+) by the enzyme urease, with the labelled CO2 detected in exhaled air. Despit... Read More about Ammonia vapour in the oral cavity as a diagnostic marker for infection with Helicobacter pylori: Preliminary 'proof of principle' pharmacological investigations.

Development of a sensor system for the early detection of soft rot in stored potato tubers (2000)
Journal Article

A number of sensor types were fabricated and tested for their electrical resistance changes to compounds known to be evolved by potato tubers with soft rot caused by the bacterium Erwinia carotovora. On the basis of these tests, three sensors were se... Read More about Development of a sensor system for the early detection of soft rot in stored potato tubers.

A study of the effects of acid on the polymerisation of pyrrole, on the oxidative polymerisation of pyrrole and on polypyrrole (2000)
Journal Article

The polymer products arising from the hydrochloric acid treatment of aqueous pyrrole were shown to have spectroscopic data consistent with alternating pyrrole and pyrrolidine units with varying degrees of ring opening of the pyrrole units. The acid c... Read More about A study of the effects of acid on the polymerisation of pyrrole, on the oxidative polymerisation of pyrrole and on polypyrrole.

A study of methods for evaluating the integrity of plate type heat exchangers used in the dairy industry (2000)
Journal Article

An overview of leak testing methods for heat exchangers is presented. The problems associated with the presence of residual liquid during testing were assessed as it was shown experimentally that complete drainage of plate type heat exchangers is ver... Read More about A study of methods for evaluating the integrity of plate type heat exchangers used in the dairy industry.

Identification of volatiles generated by potato tubers (Solanum tuberosum CV: Maris piper) infected by Erwinia carotovora, Bacillus polymyxa and Arthrobacter sp. (1999)
Journal Article

Bacteria were isolated from internal tissues of surface sterilized healthy tubers of Solanum tuberosum cv. Maris Piper (8 different isolates) and from tubers inoculated with Erwinia carotovora ssp. carotovora showing soft-rot symptoms (3 different is... Read More about Identification of volatiles generated by potato tubers (Solanum tuberosum CV: Maris piper) infected by Erwinia carotovora, Bacillus polymyxa and Arthrobacter sp..

Identification of volatiles generated by potato tubers (Solanum tuberosum CV : Maris Piper) infected by erwinia carotovora, bacillus polymyxa and arthrobacter sp (1999)
Journal Article

Bacteria were isolated from internal tissues of surface sterilized healthy tubers of Solanum tuberosum cv. Maris Piper (8 different isolates) and from tubers inoculated with Erwinia carotovora ssp. carotovora showing soft-rot symptoms (3 different is... Read More about Identification of volatiles generated by potato tubers (Solanum tuberosum CV : Maris Piper) infected by erwinia carotovora, bacillus polymyxa and arthrobacter sp.

Simple Methods for the Extraction and Identification of Amine Malodurs from Spoiled Foodstuffs (1998)
Journal Article

Headspace GC-MS analysis was performed on potato tubers infected withErwinia carotovorabacteria and on Iberian cured ham infected withMicroccusandLactobacillusbacteria strains, which cause extensive losses in stored foodstuffs. Headspace samples of i... Read More about Simple Methods for the Extraction and Identification of Amine Malodurs from Spoiled Foodstuffs.

The use of thin silver films for the detection of low concentrations of hydrogen sulphide (1998)
Journal Article

This work describes the facile fabrication of a sensor for the visual detection of hydrogen sulphide at concentrations of ≤0.1 ppm. Colloidal silver films were prepared on PVC by a dip-coating method which, on exposure to hydrogen sulphide, underwent... Read More about The use of thin silver films for the detection of low concentrations of hydrogen sulphide.

Novel composite organic-inorganic semiconductor sensors for the quantitative detection of target organic vapours (1996)
Journal Article

Composites of tin dioxide (an n-type semiconductor) and derivatives of the conducting polymer polypyrrole (a p-type semiconductor) gave reversible changes in electrical resistance at room temperature when exposed to a range of organic vapours. The op... Read More about Novel composite organic-inorganic semiconductor sensors for the quantitative detection of target organic vapours.

Electrorheological properties of polypyrrole prepared by the action of mineral acids on pyrrole (1996)
Journal Article

Polypyrrole was prepared in high yield by the polymerisation of pyrrole in strongly acidic conditions using hydrofluoric, hydrochloric (at 20°C and 100°C), hydrobromic, nitric and orthophosphoric acids. The polymer products incorporated significant a... Read More about Electrorheological properties of polypyrrole prepared by the action of mineral acids on pyrrole.