Dr Brant Walkley

PhD, BE(Hons), BSc, AMIChemE
Postdoctoral Research Associate

Dr Brant WalkleyAddress:
Department of Materials Science and Engineering
Sir Robert Hadfield Building
Mappin Street, Sheffield, S1 3JD

Email: b.walkley@sheffield.ac.uk

Brant joined The University of Sheffield in October 2016 as a Postdoctoral Research Associate after completing a PhD in Chemical and Biomolecular Engineering at The University of Melbourne, Australia (awarded December 2016). He also holds Bachelor degrees from The University of Melbourne in Chemical and Biomolecular Engineering (Honours) and Biochemistry and Molecular Biology, and has 6 years of international research and consulting experience across world leading academic institutions and industry.

Research Interests

Brant’s research focuses on development of sustainable and advanced materials for a wide variety of applications in infrastructure, energy and electronics industries. Particular focus is centred on investigation of composition-structure-property relationships, reaction mechanisms and kinetics in novel nanomaterials, nanocomposites, ceramics, and cementitious binders, using advanced spectroscopic and microstructural techniques, including solid state nuclear magnetic resonance spectroscopy. Current projects focus on development of low-CO2 cements for sustainable infrastructure; understanding and controlling radionuclide-mineral interactions in cement matrices used for immobilisation of nuclear waste; design, characterisation and exploitation of oxide-based functional ceramics for battery, solid oxide fuel cell, thermoelectric, dielectric, solid electrolyte and mixed conductor applications; and biologically inspired ‘green’ nanomaterials for applications in catalysis and carbon capture and storage.

Brant_Walkley_NMR_SEM

Solid state 27Al triple quantum magic angle spinning nuclear magnetic resonance spectrum and associated deconvolutions for a synthetic low-CO2 cement, with back-scattered electron images showing intimately mixed calcium silicate hydrate and hydrotalcite phases. Further details are available in the publications Walkley et al. Journal of Physical Chemistry C, 2018, 122 (10) 5673-5685 and Walkley et al. Cement and Concrete Research, 2017, 99 155-171.

Research Centres

Professional activities and recognition

 Key publications

Book chapters

[1] Walkley, B. (2018) Geopolymers in Marker, B. and Bobrowsky, P. T. (Ed.) Encyclopedia of Engineering Geology, Earth Sciences Series, Springer, Heidelberg. Link

[2] San Nicolas, R., Walkley, B., van Deventer, J. S. J. (2017) Fly ash based geopolymer chemistry and behaviour in Robl, T. L. and Oberlink, A. (Ed.) Coal combustion By-products: Characteristics, Utilization, Beneficiation and Risk Assessment. Woodhead Publishing. Link

Journal Articles

[1] Walkley, B., Kashani, A., Sani, M. –A., Ngo, T. D., Mendis, P. A. (2018) Examination of alkali-activated cement nanostructure during thermal treatment. Journal of Materials Science, DOI:10.1007/s10853-018-2270-z. Link

[2] Walkley, B., Rees, G. J., San Nicolas, R., van Deventer, J. S. J., Hanna, J. V., Provis, J. L., (2018) A new structural model of sodium aluminosilicate gels and the role of charge balancing extra-framework Al. Journal of Physical Chemistry C, 122 (10) 5673-5685. Link

[3] Kashani, A., Ngo, T. D., Walkley, B., Mendis, P. A. (2017) Thermal performance of calcium rich alkali activated materials: A microstructural and mechanical study. Construction and Building Materials, 153 225-237. Link

[4] Walkley, B., San Nicolas, R., Sani, M. –A., van Deventer, J. S. J., Provis, J. L., (2017) Structural evolution of synthetic alkali-activated CaO-MgO-Al2O3-SiO2-H2O materials is influenced by Mg content. Cement and Concrete Research, 99 155-171. Link

[5] Walkley, B., San Nicolas, R., Sani, M. –A., Rees, G. J., Hanna, J. V., van Deventer, J. S. J., Provis, J. L., (2016) Phase evolution of C-(N)-A-S-H/N-A-S-H gel blends via alkali-activation of synthetic precursors. Cement and Concrete Research, 89 120-135. Link

[6] Walkley, B., San Nicolas, R., Sani, M. –A., Gehman, J. D., van Deventer, J. S. J., Provis, J. L., (2016) Synthesis of stoichiometrically controlled reactive aluminosilicate and calcium-aluminosilicate powders. Powder Technology, 297 17-33. Link

[7] Walkley, B., San Nicolas, R., Sani, M. –A., Gehman, J. D., van Deventer, J. S. J., Provis, J. L., (2016) Phase evolution of Na2O–Al2O3–SiO2–H2O gels in synthetic aluminosilicate binders. Dalton Transactions, 45(13) 5521-5535. Link

[8] Walkley, B., Provis, J. L., San Nicolas, R., Sani, M. –A., Gehman, J. D., van Deventer, J. S. J., (2015) Stoichiometrically controlled C-(A)-S-H/N-A-S-H gel blends via alkali-activation of synthetic precursors. Advances in Applied Ceramics, 114(7) 372-377. Link

[9] Bernal, S. A., Provis, J. L., Walkley, B., San Nicolas, R., Gehman, J. D., Brice, D. G., Kilcullen, A. R., Duxson, P., van Deventer, J. S. J. (2013) Gel nanostructure in alkali-activated binders based on slag and fly ash, and effects of accelerated carbonation. Cement and Concrete Research, 53 127-144. Link

Conference proceedings

[1] Vasconcelos, R., Walkley, B., Hyatt, N., Provis, J. L., Corkhill, C. (2018) The physico-chemical evolution of a low-pH cement in contact with groundwater, 3rd Annual Workshop of the Cebama project, Nantes, France, 17th-18th April

[2] Yliniemi, J., Kinnunen, P., Walkley, B., Koistinen, S.-M., Provis, J. L., Illikainen, M. (2018) Alkali-activated mineral wool wastes, Young Researchers’ Forum IV, Newcastle upon Tyne, UK, 9th April

[3] Walkley, B., Rees, G. J., San Nicolas, R., van Deventer, J. S. J., Hanna, J. V., Provis, J. L., (2017) Molecular structure of alkali-activated cements as determined by solid state 27Al and 23Na MQMAS NMR, Proceedings of the 37th Annual Cement and Concrete Science Conference, London, UK, 11-12 Sept

[4] Kashani, A., Ngo, T. D., Walkley, B., Mendis, P. A. (2017) Thermal performance of calcium rich alkali activated materials: A microstructural and mechanical study. Proceedings of the 3rd International Conference on Chemically Activated Materials, Gold Coast, Australia, 8th – 13th Aug

[5] Walkley, B., San Nicolas, R., Bernal, S. A., Provis, J. L., van Deventer, J. S. J. (2015) The role of MgO in the phase assemblage of alkali-activated synthetic precursors within the system CaO-MgO-Al2O3-SiO2, Proceedings of the 14th International Congress on the Chemistry of Cement, Beijing, China, 13th Oct - 16th Oct

[6] Walkley, B., San Nicolas, R., Bernal, S. A., Provis, J. L., van Deventer, J. S. J. (2015) Effect of MgO incorporation on the structure of synthetic alkali-activated calcium aluminosilicate binders, Concrete 2015: Proceedings of the 27th Biennial National Conference of the Concrete Institute of Australia, Melbourne, Australia, 30th Aug - 2nd Sept

[7] Walkley, B., Provis, J. L., San Nicolas, R., van Deventer, J. S. J (2014) Stoichiometrically controlled C-A-S-H/N-A-S-H gel blends via alkali-activation of synthetic precursors, Proceedings of the 34th Annual Cement and Concrete Science Conference, Sheffield, United Kingdom, 14th Sept - 16th Sept

[8] Walkley, B., Provis, J. L., San Nicolas, R., van Deventer, J. S. J. (2014) Structural analysis of biphasic stoichiometrically controlled geopolymers, Non Traditional Cement and Concrete Conference, Brno, Czech Republic, 16th June - 19th June

Reports

[1] Rethinking Cement, Zero Carbon Industry Plan, Beyond Zero Emissions, 2017. Link.

 Further information

Scopus

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Researchgate