Imperial College London

ProfessorMaryRyan

Faculty of EngineeringDepartment of Materials

Vice-Dean (Research), Faculty of Engineering
 
 
 
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Contact

 

+44 (0)20 7594 6755m.p.ryan

 
 
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Location

 

B338Royal School of MinesSouth Kensington Campus

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Summary

 

Publications

Publication Type
Year
to

219 results found

Corni I, Ryan MP, Boccaccini AR, 2008, Electrophoretic deposition: From traditional ceramics to nanotechnology, JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, Vol: 28, Pages: 1353-1367, ISSN: 0955-2219

Journal article

Feng S, Shollock B, Reed RC, Ryan MPet al., 2008, Analysis of surface chemical contamination on ex-service industrial gas turbine components, 11th International Symposium on Superalloys, Publisher: MINERALS, METALS & MATERIALS SOC, Pages: 681-+

Conference paper

Ingham B, Lily BN, Mackay JR, White SP, Hendy SC, Ryan MPet al., 2007, In situ synchrotron X-Ray absorption experiments and modelling of the growth rates of electrochemically deposited zno nanostructures, Pages: 99-104, ISSN: 0272-9172

ZnO is known to produce a wide variety of nanostructures that have enormous scope for optoelectronic applications. Using an aqueous electrochemical deposition technique, we are able to tightly control a wide range of deposition parameters (Zn2 concentration, temperature, potential, time) and hence the resulting deposit morphology. By simultaneously conducting synchrotron x-ray absorption spectroscopy (XAS) experiments during the deposition, we are able to directly monitor the growth rates of the nanostructures, as well as providing direct chemical speciation of the films. In Situ experiments such as these are critical to understanding the nucleation and growth of such nanostructures. Recent results from in Situ XAS synchrotron experiments demonstrate the growth rates as a function of potential and Zn2 concentration. These are compared with the electrochemical current density recorded during the deposition, and the final morphology revealed through ex Situ high resolution electron microscopy. The results are indicative of two distinct growth regimes, and simultaneous changes in the morphology are observed. These experiments are complemented by modelling the growth of the rods in the transport-limited case, using the Nernst-Planck equations in 2 dimensions, to yield the growth rate of the volume, length, and radius as a function of time. © 2007 Materials Research Society.

Conference paper

Hutchens E, Williamson BJ, Anand M, Ryan MP, Herrington RJet al., 2007, Discriminating bacterial from electrochemical corrosion using Fe isotopes, CORROSION SCIENCE, Vol: 49, Pages: 3759-3764, ISSN: 0010-938X

Journal article

Hodges S, Laycock NJ, Krouse DP, Virtanen S, Schmutz P, Ryan MPet al., 2007, A microelectrochemical investigation of alloy C22 in chloride solutions below the critical pitting temperature, JOURNAL OF THE ELECTROCHEMICAL SOCIETY, Vol: 154, Pages: C114-C119, ISSN: 0013-4651

Journal article

Teng C-L, Ryan MP, 2007, A morphological study of nanocrystalline magnetite electrodeposited onto polycrystalline copper substrates, ELECTROCHEMICAL AND SOLID STATE LETTERS, Vol: 10, Pages: D108-D112, ISSN: 1099-0062

Journal article

Ingham B, Hendy SC, Laycock NJ, Ryan MPet al., 2007, Estimates of thermodynamic stability of iron-chromium spinels in aqueous solution based on first-principles calculations, ELECTROCHEMICAL AND SOLID STATE LETTERS, Vol: 10, Pages: C57-C59, ISSN: 1099-0062

Journal article

Ingham B, Illy BN, Mackay JR, White SP, Hendy SC, Ryan MPet al., 2007, In Situ Synchrotron X-Ray Absorption Experiments and Modelling of the Growth Rates of Electrochemically Deposited ZnO Nanostructures, Materials Research Society

Conference paper

Wang H, Branford WR, Cohen LF, Skinner SJ, Ryan MPet al., 2007, Preparation of Ferromagnetic Cobalt Substituted TiO2 (Anatase) Thin Films by Electrochemical Deposition, Chem. Mater., Vol: 19, Pages: 3084-3086

Journal article

Bocher F, Flower HM, Ryan MP, 2006, The effect of microstructure on localized corrosion in creep age-formable aluminum alloys - Identification of intermetallic particles and pit initiation sites, JOURNAL OF THE ELECTROCHEMICAL SOCIETY, Vol: 153, Pages: B551-B554, ISSN: 0013-4651

Journal article

Hendy SC, Laycock NJ, Ryan MP, 2005, Atomistic modeling of cation transport in the passive film on iron and implications for models of growth kinetics, JOURNAL OF THE ELECTROCHEMICAL SOCIETY, Vol: 152, Pages: B271-B276, ISSN: 0013-4651

Journal article

Illy B, Shollock BA, MacManus JL, Ryan MPet al., 2005, Electrochemical growth of ZnO nanoplates, Nanotechnology, Vol: 16, Pages: 320-324, ISSN: 0957-4484

Journal article

Ryan M, 2004, Corrosion - Peering below the surface, NATURE MATERIALS, Vol: 3, Pages: 663-664, ISSN: 1476-1122

Journal article

Winkler SL, Ryan MP, Flower HM, 2004, Pitting corrosion in cast 7XXX aluminium alloys and fibre reinforced MMCs, Corrosion Science, Vol: 46, Pages: 893-902, ISSN: 0010-938X

The corrosion behaviour of cast and heat-treated Al-6%Zn-1%Mg and Al-6%Zn-1%Mg-1%Ag alloys and metal matrix composites (MMCs) were investigated using dynamic polarisation techniques, followed by scanning electron microscopy (SEM) and secondary ion mass spectrometry (SIMS). The addition of silver and the incorporation of continuous Altex fibres into the alloys have a positive effect on the materials' corrosion resistance. It was observed that due to the presence of second phase particles and microsegregation, pitting occurs preferentially at the grain boundary and fibre/matrix interface regions in the cast alloys and composites, respectively. © 2003 Elsevier Ltd. All rights reserved.

Journal article

Winkler SL, Ryan MP, Flower HM, 2004, Pitting corrosion in cast 7XXX aluminium alloys and fibre reinforced MMCs, CORROSION SCIENCE, Vol: 46, Pages: 893-902, ISSN: 0010-938X

Journal article

Atkin J, Hendy S, Laycock N, Mackay J, Nanjo H, Ryan Met al., 2003, Atomistic modeling of the passive film on iron, Pages: 37-54

Atomistic modeling has been used to study the structure and transport properties of surface oxide films on pure iron. These calculations have been used to constrain parameters in the high-field model and diffusion-limited growth model for oxide growth kinetics. Only the Verwey high-field model is found to be consistent with the atomistic modeling, although consistency requires a large interstitial cation concentration. However, if cation transport is dominated by grain-boundary diffusion, the Mott-Cabrera high-field model can be reconciled with the atomistic modeling. Finally, we have considered models of grain ripening and examined the relationship between in-plane grain growth and out-of-plane thickening of the film. If grain ripening is occurring during film growth, then diffusion-limited growth is found to be consistent with empirical data.

Conference paper

Wong MH, Berenov A, Qi X, Kappers MJ, Barber ZH, Illy B, Lockman Z, Ryan MP, MacManus-Driscoll JLet al., 2003, Electrochemical growth of ZnO nano-rods on polycrystalline Zn foil, NANOTECHNOLOGY, Vol: 14, Pages: 968-973, ISSN: 0957-4484

Journal article

Ryan MP, Williams DE, Chater RJ, Hutton BM, McPhail DSet al., 2003, Metallurgy - Stainless-steel corrosion and MnS inclusions - Reply, NATURE, Vol: 424, Pages: 390-390, ISSN: 0028-0836

Journal article

Turnbull A, Ryan M, Willetts A, Zhou SQet al., 2003, Corrosion and electrochemical behaviour of 316L stainless steel in acetic acid solutions, CORROSION SCIENCE, Vol: 45, Pages: 1051-1072, ISSN: 0010-938X

Journal article

Hendy S, Walker B, Laycock N, Ryan Met al., 2003, Ab initio studies of the passive film formed on iron, PHYSICAL REVIEW B, Vol: 67, ISSN: 1098-0121

Journal article

Rees EE, McPhail DS, Ryan MP, Kelly J, Dowsett MGet al., 2003, Low energy SIMS characterisation of ultra thin oxides on ferrous alloys, 13th International Conference on Secondary Ion Mass Spectrometry and Related Topics (SIMS XIII), Publisher: ELSEVIER SCIENCE BV, Pages: 660-664, ISSN: 0169-4332

Conference paper

Laycock NJ, Ryan MP, Hendy S, Krouse D, Atkin J, Mackay J, Nanjo Het al., 2003, Modelling the formation and localised breakdown of passive films, Nagoya, Japan, AIST symposium

Conference paper

Ryan MP, Crouch DS, Virtanen S, Schmutz P, Suter T, Laycock NJet al., 2003, Pit nucleation events and compositional thresholds in the pitting of iron-chromium thin films, Pennington, N.J., Publisher: Electrochemical Society

Conference paper

Ryan MP, Williams DE, Chater R, Hutton BM, McPhail DSet al., 2003, Metallurgy - stainless steel corrosion and MnS inclusions - reply, Nature, Vol: 424, Pages: 389-390, ISSN: 0028-0836

Journal article

Mackay JR, Hendy S, Laycock NJ, Ryan MP, Toney MF, Oblonsky LJet al., 2003, The structure and growth of passive films on iron, chromium and iron-chromium alloys, Pennington, N.J., Critical factors in localized corrosion IV : a symposium in honor of the 65th birthday of Hans B"hni : proceedings of the international symposium, Salt Lake City, UT, October 20-25, 2002, Publisher: Electrochemical Society

Conference paper

Turnbull A, Francis PE, Ryan MP, Orkney LP, Griffiths AJ, Hawkins Bet al., 2002, A novel approach to characterizing the corrosion resistance of super duplex stainless steel welds, CORROSION, Vol: 58, Pages: 1039-1048, ISSN: 0010-9312

Journal article

Isaacs HS, Virtanen S, Ryan MP, Schmuki P, Oblonsky LJet al., 2002, Incorporation of Cr in the passive film on Fe from chromate solutions, ELECTROCHIMICA ACTA, Vol: 47, Pages: 3127-3130, ISSN: 0013-4686

Journal article

Rees EE, Ryan MP, McPhail DS, 2002, An STM study of the nanocrystalline structure of the passive film on iron, ELECTROCHEMICAL AND SOLID STATE LETTERS, Vol: 5, Pages: B21-B23, ISSN: 1099-0062

Journal article

Ryan MP, Williams DE, Chater RJ, Hutton BM, McPhail DSet al., 2002, Why stainless steel corrodes, NATURE, Vol: 415, Pages: 770-774, ISSN: 0028-0836

Journal article

Oblonsky LJ, Ryan MP, 2001, In situ X-ray absorption near-edge structure study of the active and transpassive dissolution of passive films on Ni and Ni-Cr alloys in 0.1 M H2SO4, JOURNAL OF THE ELECTROCHEMICAL SOCIETY, Vol: 148, Pages: B405-B411, ISSN: 0013-4651

Journal article

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