Begbroke Science Park

Oxford, United Kingdom

Begbroke Science Park

Oxford, United Kingdom
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Xiong L.,University of Oxford | Batchelor-Mcauley C.,University of Oxford | Ward K.R.,University of Oxford | Downing C.,Begbroke Science Park | And 3 more authors.
Journal of Electroanalytical Chemistry | Year: 2011

Through theoretical modelling based upon a diffusion domain approach, we show that for a basal plane pyrolytic graphite electrode with a 10-20% surface coverage of edge plane sites, minimal differences in the voltammetric response should be expected from that of an edge plane pyrolytic graphite electrode. Further through the use of organic solvents, for the modification of the electrode surface, it is demonstrated that the voltammetry of the oxidation of ferrocyanide in aqueous solution is surface sensitive and we infer that it likely occurs through the formation of a bridging ion complex with the electrode surface. Accordingly it is suggested that the electron transfer mechanism for the oxidation of ferrocyanide at a graphite electrode should not be viewed as being outer-sphere in nature. These results have implications for voltammetric experimentation with both graphite and carbon nanotube modified electrodes. © 2011 Elsevier B.V. All rights reserved.

Al Kutubi H.,University of Bath | Al Kutubi H.,Technical University of Delft | Rassaei L.,Technical University of Delft | Olthuis W.,University of Twente | And 12 more authors.
RSC Advances | Year: 2015

The highly rigid molecular structure of Polymers of Intrinsic Microporosity (PIM) - associated with a high thermolysis threshold - combined with the possibility to fill intrinsic micropores allows the direct "one-step" templated conversion of metal nitrates into nano-structured metal oxides. This is demonstrated here with PIM-EA-TB and with PIM-1 for the conversion of Pr(NO3)3 to Pr6O11. This journal is © The Royal Society of Chemistry.

Neumann C.C.M.,University of Oxford | Batchelor-Mcauley C.,University of Oxford | Downing C.,Begbroke Science Park | Compton R.G.,University of Oxford
Chemistry - A European Journal | Year: 2011

Graphitic electrodes find widespread use throughout electrochemistry; understanding their fundamental electrochemical properties is imperative. It is widely thought that graphite edge plane sites exhibit faster rates of electron transfer as compared to basal plane sites. Hitherto the different rates of electron transfer at the edge and basal sites have been inferred indirectly using diffusional systems. To avoid possible complications we alternatively study a surface-bound system to simplify the interpretation. The voltammetric response of graphitic-surface-bound anthraquinone monosulfonate (AQMS) with varying pH, reveals two distinct voltammetric responses, ascribed as being due to the basal and edge plane sites; where the pKa s associated with the reduced anthraquinone are found to differ for the two sites. Through modelling of the system based upon a "scheme of squares" mechanism it is possible to conclude that both the thermodynamics and kinetics of the species differ in the two environments in which the rate of electron transfer at the basal plane site is shown to be 2-3 orders of magnitude slower than that of the edge plane site. This work provides the first example of a voltammetric response which is purely due to electron transfer at a basal plane site. Further, we believe this is the first time a full "scheme of squares" model has been used for the quantitative analysis of a diffusionless 2H+2e - system. Copyright © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Harfield J.C.,Physical and Theoretical Chemistry Laboratory | Toghill K.E.,Physical and Theoretical Chemistry Laboratory | Batchelor-Mcauley C.,Physical and Theoretical Chemistry Laboratory | Downing C.,Begbroke Science Park | Compton R.G.,Physical and Theoretical Chemistry Laboratory
Electroanalysis | Year: 2011

The electrooxidation of adenine, guanine and DNA was investigated under alkaline conditions at unmodified (BDDE) and at a nickel nanoparticle modified boron-doped diamond electrodes (Ni-BDDE). An oxidative response was observed at the Ni-BDDE for each analyte, particularly notable of the adenine as the oxidation overpotential was reduced to below 0.5V vs. SCE, and was otherwise unobserved at the unmodified electrode. © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Armstrong P.,Begbroke Science Park | Ager D.,Begbroke Science Park | Thompson I.,Begbroke Science Park | McCulloch M.,Begbroke Science Park
Energy | Year: 2014

Domestic hot water tanks represent a significant potential demand side management asset within energy systems. To operate effectively as energy storage devices, it is crucial that a stratified temperature distribution is maintained during operation; this paper details experimental and numerical work conducted to understand the influence that wall material specification has on de-stratification within domestic hot water tanks. A 2d axisymmetric CFD (Computational Fluid Dynamic) model was consistent with experiments which showed that switching from copper to stainless steel resulted in a 2.7 fold reduction in useable hot water loss through reduced de-stratification for a 74L UK domestic hot water tank over a 48h period. During simulation, a counter rotating convection system, with peak velocities of 0.005m/s, was observed above and below the thermocline. Minimizing de-stratification, through appropriate wall material selection, increases the performance of hot water tanks and scope for their use in demand side management applications. Given the inconclusive evidence surrounding copper's efficacy as a sanitizing agent, along with the low tensile strength of polyethylene, this paper advocates the use of stainless steel in hot water tank walls and further exploration of alternative materials and composites which have low cost and low thermal conductivity along with high strength and manufacturability. © 2014.

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