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University of Salford

UOA 29 - Metallurgy and Materials

RA1, RA2 and RA5c: Staff and output details and Category C staff circumstances

 

Abyaneh, M Y - Category : C

RA5c - Category C staff circumstances:

Professor Abyaneh holds a visiting professorship in the Centre for Theory and Modelling. His research is in the development of analytic models for the nucleation of nanocrystallite deposits by electrolysis, work that he first undertook in collaboration with Prof Martin Fleischman FRS, prior to the latter’s involvement with cold fusion. He has developed a comprehensive model of the deposits that can be deduced from the electrochemical response. His expertise is of interest to a number of members of the IMR, eg deposition of catalysts in carbon frameworks for hydrogen storage/fuel cell electrodes (Ross,Morrison), dendritic growth of electro-deposits (Pilkington)and modelling battery systems (Mellors).  Mellors and Abyaneh recently submitted a Joule Energy Research Centre (NWDA) grant application entitled “Necessary modification to the electrocrystallization models to make them relevant to battery systems”.

RA2 - Research outputs:

Number of outputs: 4

Output number: 1 of 4

Title

Extracting nucleation rates from current-time transients - Part I: the choice of growth models

Output type: Journal article
Journal title: Journal of Electroanalytical Chemistry
Month/year of publication: July 2002
Pagination: 82-88
Volume: 530 (1-2)
ISSN: 0022-0728
DOI: 10.1016/S0022-0728(02)00972-5 ?
Other relevant details: This paper proves for the first time and beyond any doubt,that,although we cannot assess the exact morphology of crystal growth in an electrochemical process,using the existing electrochemical techniques,we can extract information about the kinetics of the early stages of nucleation.Thus,we can use the simple mathematical model of growth of cones developed by Abyaneh&Fleischmann to obtain reasonable estimates of crystal morphology.This was proved by comparing the results obtained by using the conic model with the model of growth of hemispheres developed by Abyaneh. This paper has been cited 45 times

Output number: 2 of 4

Title

Extracting nucleation rates from current-time transients - Part II: comparing the computer-fit and pre-pulse method

Output type: Journal article
Journal title: Journal of Electroanalytical Chemistry
Month/year of publication: July 2002
Pagination: 89-95
Volume: 530 (1-2)
ISSN: 0022-0728
DOI: 10.1016/S0022-0728(02)00973-7 ?
Co-authors: Fleischmann M
Other relevant details: This paper shows for the first time that the so-called instantaneous model of nucleation cannot explain the transients obtained by use of a large prepulse potential, despite the fact that the initially rising transient has the same characteristic time dependence (as originally proposed by Avrami and others). Thus the suitability of the pre-pulse method as a means of estimating nucleation rate is questioned and the inability of classical and atomistic theories of nucleation to arrive at plausible values for critical nucleation size has once again been demonstrated. This paper has been cited 18 times.

Output number: 3 of 4

Title

Modelling diffusion controlled electrocrystallisation processes

Output type: Journal article
Journal title: Journal of Electroanalytical Chemistry
Month/year of publication: January 2006
Pagination: 196-203
Volume: 586 (2)
ISSN: 0022-0728
DOI: 10.1016/j.jelechem.2005.10.004 ?
Other relevant details: Equations are derived covering the early stages of the diffusion-controlled growth of electrodeposits, showing two independent processes contributing to the decreasing crystal growth rate. Firstly, the ionic concentration gradient gets smaller (successfully modelled using Fick's Laws of diffusion). Secondly, the successive overlap of the diffusion zones, together with the progressive coverage of the electrode surface by the growth centres, gradually transforms the ionic flow configuration from a radial to linear mode. This work demonstrates that all previously postulated current–time transient models (CTTs) only account for the first of these processes. The correct formulation has been proposed.

Output number: 4 of 4

Title

Kinetics of two-phase electrocrystallization processes IV. CTTs associated with the growth of dissimilar geometric shapes

Output type: Journal article
Journal title: Journal of the Electrochemical Society
Month/year of publication: November 2006
Pagination: D5-D12
Volume: 154 (1)
ISSN: 0013-4651
DOI: 10.1149/1.2364814 ?
Other relevant details: This paper, based on earlier analysis of complex 2-phase nucleation processes, mathematically models the transient behaviour when the two phases have dissimilar geometric growth forms. It is shown that during the pre-pulse potential, different phase can be formed, thus nullifing the use of the pre-pulse technique in measurements of the kinetics of nucleation. Taken with his previous publications, resulting from an original collaboration with Martin Fleischmann, these papers lay a firm theoretical basis for the process of electrocrystallisation, which can be used to optimise catalyst deposition in hydrogen storage systems relevant to work in the Centre for Functional Materials.