Dr Sam Walling

PhD, BSc

Department of Materials Science and Engineering

Research Associate

s.walling@sheffield.ac.uk

Sir Robert Hadfield Building

Full contact details

Dr Sam Walling
Department of Materials Science and Engineering
Sir Robert Hadfield Building
Mappin Street
Sheffield
S1 3JD

Profile: Sam is a research associate within the Immobilisation Science Laboratory. He currently focusses on the thermal treatment of radioactive wastes, with a particular focus on Fenton oxidation and hot isostatic pressing, from material treatment through to aqueous durability assessment.

Qualifications

PhD, The University of Sheffield (2016)

BSc, University of Plymouth (2009)

Research interests

Thermal treatment of radioactive wastes

Understanding the processing, phase assemblages, and aqueous durability of thermally treated radioactive wastes. Principally vitrified and hot isostatically pressed inorganic wastes.

Fenton oxidation

Utilising this lower temperature oxidation process (<100 °C) for treatment of organic radioactive wastes, using mixed metallic catalysts. Particular interest in processing ¹⁴C bearing wastes.

Magnesium based cements

General interest in further understanding the chemistry and applications of magnesium based cements, notably magnesium phosphate (struvite) cements.

Publications

Journal articles

Thorpe CL, Neeway JJ, Pearce CI, Hand RJ, Fisher AJ, Walling SA, Hyatt NC, Kruger AA, Schweiger M, Kosson DS , Arendt CL et al (2021) Forty years of durability assessment of nuclear waste glass by standard methods. npj Materials Degradation, 5.
Nava-Farias L, Neeway JJ, Schweiger MJ, Marcial J, Canfield NL, Pearce CI, Peeler DK, Vicenzi EP, Kosson DS, Delapp RC , McCloy JS et al (2021) Applying laboratory methods for durability assessment of vitrified material to archaeological samples. npj Materials Degradation, 5(1). View this article in WRRO
Hafeez MA, Hong SJ, Jeon J, Lee J, Singh BK, Hyatt NC, Walling SA, Heo J & Um W (2021) Co2+/PMS based sulfate-radical treatment for effective mineralization of spent ion exchange resin.. Chemosphere, 287(Pt 4), 132351.
Walling SA, Um W, Corkhill CL & Hyatt NC (2021) Fenton and Fenton-like wet oxidation for degradation and destruction of organic radioactive wastes. npj Materials Degradation, 5(1).
Walling SA, Gardner LJ, Pang HKC, Mann C, Corkhill CL, Mikusova A, Lichvar P & Hyatt NC (2021) Characterisation and durability of a vitrified wasteform for simulated Chrompik III waste. Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT), 19(3), 339-352. View this article in WRRO
Gardner LJ, Corkhill CL, Walling SA, Vigor JE, Murray CA, Tang CC, Provis JL & Hyatt NC (2021) Early age hydration and application of blended magnesium potassium phosphate cements for reduced corrosion of reactive metals. Cement and Concrete Research, 143, 106375-106375.
Gardner LJ, Walling SA, Corkhill CL, Bernal SA, Lejeune V, Stennett MC, Provis JL & Hyatt NC (2021) Temperature transformation of blended magnesium potassium phosphate cement binders. Cement and Concrete Research, 141. View this article in WRRO
Gardner LJ, Walling SA, Corkhill CL & Hyatt NC (2021) Thermal treatment of Cs-exchanged chabazite by hot isostatic pressing to support decommissioning of Fukushima Daiichi nuclear power plant. Journal of Hazardous Materials. View this article in WRRO
Walling SA, Kauffmann MN, Gardner LJ, Bailey DJ, Stennett MC, Corkhill CL & Hyatt NC (2021) Characterisation and disposability assessment of multi-waste stream in-container vitrified products for higher activity radioactive waste. Journal of Hazardous Materials, 401. View this article in WRRO
Gardner LJ, Walling SA, Lawson SM, Sun S, Bernal SA, Corkhill CL, Provis JL, Apperley DC, Iuga D, Hanna JV & Hyatt NC (2021) Characterization of and structural insight into struvite-K, MgKPO4·6H2O, an analogue of struvite. Inorganic Chemistry, 60(1), 195-205. View this article in WRRO
Blackburn LR, Crawford R, Walling SA, Gardner LJ, Cole MR, Sun S-K, Gausse C, Mason AR, Stennett MC, Maddrell ER , Hyatt NC et al (2021) Influence of accessory phases and surrogate type on accelerated leaching of zirconolite wasteforms. npj Materials Degradation, 5(1), 24. View this article in WRRO
Bailey DJ, Stennett MC, Sun SK, Gardner LJ, Walling SA, Corkhill CL, Ravel B & Hyatt NC (2020) Ce and U speciation in wasteforms for thermal treatment of plutonium bearing wastes, probed by L3 edge XANES. IOP Conference Series: Materials Science and Engineering, 818. View this article in WRRO
Nieminen M, Olin M, Laatikainen-Luntama J, Wickham SM, Doudou S, Fuller AJ, Kent J, Fournier M, Clarke S, Scales C , Hyatt NC et al (2020) Thermal treatment for radioactive waste minimisation. EPJ Nuclear Sciences & Technologies, 6. View this article in WRRO
Hughes CE, Walkley B, Gardner LJ, Walling SA, Bernal SA, Iuga D, Provis JL & Harris KDM (2019) Exploiting in-situ solid-state NMR spectroscopy to probe the early stages of hydration of calcium aluminate cement. Solid State Nuclear Magnetic Resonance, 99(J. Magn. Reson. 57 1984), 1-6. View this article in WRRO
Walling SA, Notman S, Watts P, Govan N & Provis JL (2019) Portland cement based immobilization/destruction of chemical weapon agent degradation products. Industrial & Engineering Chemistry Research, 58(24), 10383-10393. View this article in WRRO
Walling SA, Bernal SA, Gardner LJ, Kinoshita H & Provis JL (2018) Phase Formation and Evolution in Mg(OH)2–Zeolite Cements. Industrial & Engineering Chemistry Research, 57(6), 2105-2113. View this article in WRRO
Gardner LJ, Bernal SA, Walling SA, Corkhill CL, Provis JL & Hyatt NC (2018) Response to the discussion by Hongyan Ma and Ying Li of the paper “Characterization of magnesium potassium phosphate cement blended with fly ash and ground granulated blast furnace slag”. Cement and Concrete Research, 103, 249-253. View this article in WRRO
Walling SA & Provis JL (2016) Magnesia-Based Cements: A Journey of 150 Years, and Cements for the Future?. Chemical Reviews, 116(7), 4170-4204. View this article in WRRO
Walling SA & Provis JL (2016) A discussion of the papers “ Impact of hydrated magnesium carbonate additives on the carbonation of reactive MgO cements ” and “ Enhancing the carbonation of MgO cement porous blocks through improved curing conditions ”, by C. Unluer & A. Al-Tabbaa. Cement and Concrete Research, 79, 424-426. View this article in WRRO
Gardner LJ, Bernal SA, Walling SA, Corkhill CL, Provis JL & Hyatt NC (2015) Characterisation of magnesium potassium phosphate cements blended with fly ash and ground granulated blast furnace slag. Cement and Concrete Research, 74, 78-87. View this article in WRRO
Walling SA, Kinoshita H, Bernal Lopez SA, Collier NC & Provis JL (2015) Structure and properties of binder gels formed in the system Mg(OH)2–SiO2–H2O for immobilisation of Magnox sludge. Dalton Transactions, 44(17), 8126-8137. View this article in WRRO
Walling SA, Bernal SA, Kinoshita H, Collier NC & Provis JL (2014) Cementitious binders in the system Mg(OH)2–NaAlO2–SiO2–H2O. Advances in Applied Ceramics, 113(8), 496-501.
Walling SA, Bernal SA, Gardner LJ, Kinoshita H & Provis JL () Blast furnace slag-Mg(OH)2 cements activated by sodium carbonate. RSC Advances, 8(41), 23101-23118. View this article in WRRO

Chapters

Walling SA, Gardner LJ & Hyatt NC (2021) ILW conditioning and performance, Encyclopedia of Nuclear Energy (pp. 548-563). Elsevier

Conference proceedings papers

Gardner LJ, Walling SA & Hyatt NC (2020) Hot isostatic pressing: thermal treatment trials of inactive and radioactive simulant UK intermediate level waste. IOP Conference Series: Materials Science and Engineering, Vol. 818. Manchester, UK, 4 February 2020 - 5 February 2020. View this article in WRRO
Walling SA, Gardner LJ & Hyatt NC (2020) Characterisation of co-mixed HIP wasteforms for Magnox sludge and clinoptilolite wastes. IOP Conference Series: Materials Science and Engineering, Vol. 818. Manchester, UK, 4 February 2020 - 5 February 2020. View this article in WRRO