Dmitry Maltsev

Postdoctoral Research Associate - Molten Salt Chemistry

Dr. Maltsev has been involved in Molten Salt Chemistry since he was an undergraduate student. He has studied behaviour of oxygen containing uranium (V) ions, UO2+, in chloride melts that included studying processes of formation of U(V) ions under high temperature or electrochemical reduction of uranyl ions or oxidation of U(IV) ionsApart from its fundamental interest, this work was aimed at studying the reactions of uranyl ions reduction in melts contained imitators of fission products (Nb, Zr, Pd), and estimating possibility of joint separation of electropositive fission products from uranyl contained melts without employing electrolysis. Two patents were obtained based on the results of this work.

His project as a post-graduate student at Ural Federal University was to investigate the behaviour and properties of uranium in chloride melts as well as in liquid metal alloys based on binary alloys of Ga with In, Al, and Sn. The main goal was to obtain electrochemical and thermodynamic data necessary to estimate separation factor of actinides and lanthanides as well as to verify thermodynamic calculation by experiment. This was achieved and experimental values of separation factors were obtained.

His project as a master student at Ural Federal University was to study Gd behaviour in liquid metal alloys based on binary alloys of Ga with Zn and Sn, specifically determining solubility, activity and activity coefficients in the systems studied in a wide temperature range.

Results of his post-graduate and master work were the part of a large scale scientific project in Russia devoted to development of a process of separation fission products from fissile materials in a “chloride melt – liquid metal” system.

He has worked in a laboratory of high-temperature spectroscopy and continue spectroscopic, electrochemical and spectroelectrochemical investigation of behaviour and speciation of various elements in molten salts and liquid metals, including mutual effects when several elements are present together. The elements lately studied included uranium, lanthanum, zirconium, and gadolinium. In June 2017, a Master student under a joint supervision of Dr. V.A. Volkovich and Dr. Maltsev successfully defended their thesis on “Thermodynamic properties of rare earth elements in La–RE–Ga–In (RE = Nd, Y) Alloys”. 

Currently, Dr. Maltsev is working on enhancing the specific heat capacity of molten salts for heat transfer applications using nanoparticles. He will continue the spectroscopic study of behaviour and speciation of uranium in molten salts.

 

 

Research-related Skills and Scientific Interests

  • Electronic absorption spectroscopy and electrochemistry applied to molten salts over a wide temperature range. In particular, he has studied the behaviour of uranium in molten alkali chlorides, and in the presence of niobium, zirconium and molybdenum, investigated possibilities of using liquid metal systems in reprocessing spent nuclear fuels. Experienced in working with a range of conventional and fibre optic spectrophotometers and associated computer programs.

 

  • Enhancing the specific heat capacity of molten salts for heat transfer applications using nanoparticles.

 

  • Experience in investigating possible applications of molten salt and bimetallic liquid alloys media for technological purposes, including electroplating, refining, nuclear reactor fuels production and reprocessing.

 

  • Experience in investigating thermodynamic properties of uranium and rare earth elements in liquid metal alloys based on Ga, In, Al, Zn, Sn and their mixtures.

 

  • Experience in the classical methods of analysis, as well as several instrumental analytical techniques, including uv-vis., IR, Raman and diffuse reflectance spectroscopy, and X-ray powder diffraction.

 

  • Experience in molten salts preparation and purification.

 

  • Radiochemistry training. Worked with uranium.

 

Awards

2017 - 2019: Grant From Russian Science Foundation Within The Program “Research Conducted By Research Teams Under The Guidance of Young Scientists”.
2016: Scopus Award Russia 2016 For Outstanding Achievements In Research And Innovation.
2013 - 2015: Russian Foundation For Basic Research Grant For Young Scientist. Research Topic: “Study Of F-Elements Distribution In A “Molten Salt – Liquid Metal” System And Determining Influence Of Liquid Metal Phase Composition On Distribution Factor”.
2011: Awarded By The Government Of Sverdlovsk Region, The First Prize For The Best Graduation Work Of The Year In Physical Sciences.

Other Publications

He is the Co-Author of 111 publications including 53 full papers in refereed scientific journals and proceedings of Russian and international conferences. The major recent publications include:
1. V. A. Volkovich, D. E. Aleksandrov, D. S. Maltsev, B. D. Vasin, I. B. Polovov, T. R. Griffiths, “Reduction of uranyl(VI) species in alkali chloride melts”, in Molten Salts Chemistry and Technology, M. Gaune-Escard and G.M. Haarberg, Editors, John Wiley & Sons Inc., Hoboken, 2014, p. 507-520.
2. D. S. Maltsev, V. A. Volkovich, E. N. Vladykin, B. D. Vasin, “An electrochemical study of uranium (III) and (IV) species in fused alkali chlorides”, ECS Transactions, 2014, 64(4), 357-367.
3. S. Yu. Melchakov, D. S. Maltsev, V. A. Volkovich, L. F. Yamshchikov, A. G. Osipenko, “Separation of uranium and lanthanides in a fused salt – liquid gallium based alloy system”, ECS Transactions, 2014, 64(4), 369-375.
4. D. S. Maltsev, V. A. Volkovich, E. N. Vladykin, B. D. Vasin, “Electrode potentials of silver in LiCl–KCl–CsCl eutectic melt”, Rasplavy, 2014, (6), 36-40 (in Russian).
5. V. A. Volkovich, D. S. Maltsev, L. F. Yamshchikov, A. G. Osipenko, “Thermodynamic properties of uranium in liquid gallium, indium and their alloys”, J. Nuclear Material, 2015, 464, 263-269.
6. V. A. Volkovich, D. S. Maltsev, L. F. Yamshchikov, A. V. Chukin, V. V. Smolenski, A. V. Novoselova, A. G. Osipenko, “Thermodynamic properties of uranium in gallium-aluminium based alloys”, J. Nuclear Material, 2015, 465, 153-160.
7. S. Yu. Melchakov, D.S. Maltsev, V.A. Volkovich, L.F. Yamshchikov, D.G. Lisienko, A.G. Osipenko, M.A. Rusakov, “Uranium and neodymium partitioning in alkali chloride melts using low-melting gallium-based alloys”, Nukleonika, 2015, 60(4), 915-920.
8. D. S. Maltsev, V. A. Volkovich, B. D. Vasin, E. N. Vladykin, “An electrochemical study of uranium behaviour in LiCl-KCl-CsCl eutectic melt”, J. Nuclear Materials, 2015, 467 part 2, 956-963.
9. D. S. Maltsev, V. A. Volkovich, L. F. Yamshchikov, A. V. Chukin, “Thermodynamics of U in (Ga–Sn) eutectic alloy”, J. Chemical Thermodynamics, 2016, 93, 95-100.
10. D. S. Maltsev, V. A. Volkovich, B. D. Vasin, “Diffusion coefficients of uranium (III) and (IV) ions in LiCl–KCl–CsCl eutectic melt”, Rasplavy, 2016, (3), 226-237 (in Russian).
11. D. S. Maltsev, V. A. Volkovich, B. D. Vasin, “Red-ox potentials of uranium in lithium, potassium and cesium chlorides eutectic melt”, Rasplavy, 2016, (3), 238-244 (in Russian).
12. D. S. Maltsev, V. A. Volkovich, L. F. Yamshchikov, A. V. Chukin, “Thermodynamic properties of gadolinium in Ga–Sn and Ga–Zn eutectic based alloys”, AIP Proceedings, 2016, 1767, 020012 (1–10).
13. A. B. Ivanov, V. A. Volkovich, D. S. Maltsev, V. V. Sukhikh, T. R. Griffiths, “Precipitation of rare earth phosphates from molten salts: Particle size distribution analysis”, ECS Transactions, 2016, 75 (15), 313-321.
14. V. A. Volkovich, D. S. Maltsev, S. Yu. Melchakov, L. F. Yamshchikov, A. V. Novoselova, V. V. Smolensky, “Separation of lanthanides and actinides in a chloride melt – liquid metal system: The effect of phase composition”, ECS Transactions, 2016, 75 (15), 397-408.
15. E. V. Raguzina, D. S. Maltsev, V. A. Volkovich, L. F. Yamshchikov, A. V. Chukin, “Thermodynamic properties of rare earth elements in La–RE–Ga–In alloys (RE = Nd, Y)”, AIP Conference Proceedings, 2017, 1886, 020036 (1–8).
16. V.A. Volkovich, A.B. Ivanov, R.V. Kamalov, D.S. Maltsev, B.D. Vasin, T.R. Griffiths “Electrode and redox potentials of molybdenum and stability of molybdenum chloro-species in alkali chloride melts”, J. Electrochemical Society, 2017, 164 (8), H5336–H5344.
17. D. S. Maltsev, V. A. Volkovich, A. B. Ivanov, A. A. Ryzhov, K. E. Strepetov, A. A. Kozlova and M. N. Soldatova, “Electrochemical behavior of zirconium in LiCl–KCl eutectic melt”, AIP Conference Proceedings, 2018, 2015, 020057 (1-7).
18. D. S. Maltsev, V. A. Volkovich, E. V. Raguzina, K. E. Strepetov, A. A. Kozlova, M. N. Soldatova, “Electrochemical properties of uranium and zirconium on solid and liquid electrodes in 3LiCl–2KCl based melts”, ECS Transactions, 2018, 86(14), 55-67.
19. A. V. Shchetinskiy, A. S. Dedyukhin, V. A. Volkovich, R. Yu. Kaychenkova, D. S. Maltsev, I. B. Polovov, A. V. Chukin, “Interaction of neodymium containing chloride melts with oxygen species”, ECS Transactions, 2018, 86(14), 341-350.
20. V. A. Volkovich, Ya. A. Shatkovskyi, D. E. Aleksandrov, D. S. Maltsev, “Electronic absorption spectra of uranium(V) species in fused alkali chlorides”, ECS Transactions, 2018, 86(14), 367-376.
21. A. Rakhmatullin, I.B. Polovov, D.S. Maltsev, M. Allix, V.A. Volkovich, A.V. Chukin, M. Boca, C. Bessada “Combined approach for the structural characterization of alkali fluoroscandiates: Solid-state NMR, powder X-ray diffraction, and density functional theory calculations”, Inorganic Chemistry, 2018, Vol. 57, Issue 3, 1184–1195 p.
22. V.A. Volkovich, D.S. Maltsev, E.V. Raguzina, A.S. Dedyukhin, A.V. Shchetinskiy, L.F. Yamshchikov and A.V. Chukin, “Thermodynamics of rare earth elements and uranium in gallium based quaternary metallic alloys”, Journal of Alloys and Compounds, 2019, 787, 367-378.
23. A. Rakhmatullin, M. Allix, I.B. Polovov, D. Maltsev, A.V. Chukin, R. Bakirov, C. Bessada, “Combining solid state NMR, powder X-ray diffraction, and DFT calculations for CsSc3F10 structure determination”, Journal of Alloys and Compounds, 2019, 787, 1349-1355.
24. V.A. Volkovich, D.S. Maltsev, M.N. Soldatova, A.A. Ryzhov, A.B. Ivanov, “Separation of uranium and zirconium in alkali chloride melts using liquid metal cathodes”, ECS Transactions, 2020, Vol. 98, Issue 10, 355–364 p.
25. V.A. Volkovich, A.B. Ivanov, A.A. Ryzhov, D.S. Maltsev, T.R. Griffiths “Kinetics of reaction of oxygen with uranium(IV) chloride in alkali chloride melts”, ECS Transactions, 2020, Vol. 98, Issue 10, 365–372 p.
26. P.W. Halstenberg, D. Maltsev, D. Nguyen, E. Kim, S. Dai, “Mechanochemical Synthesis of High-Purity Anhydrous Binary Alkali and Alkaline Earth Chloride Mixtures”, Industrial and Engineering Chemistry Research, 2020.
27. Volkovich V.A., Maltsev D.S., Soldatova M.N., Ryzhov A.A., Ivanov A.B. “Application of low melting metals for separation of uranium and zirconium in a “fused chloride—liquid alloy” system”, Metals, Vol. 11 (4), 2021, Article number 550.
28. Volkovich V.A., Ryzhov A.A., Ivanov A.B., Shchetinskiy A.V., Maltsev D.S. “Reaction of Oxygen with Solutions of Neodymium Chloride in Alkali Chloride Melts: A Spectroscopy and Kinetics Study”, Journal of the Electrochemical Society, Vol. 168 (4), 2021, Article number 046513.
29. Volkovich V.A., Ivanov A.B., Ryzhov A.A., Mal’tsev D.S., Shchetinskii A.V. “Reaction of Oxygen with Uranium Trichloride in Molten Alkali Metal Chlorides”, Russian Metallurgy (Metally), Vol. 2021 (8), 2021, pp. 1040 – 1043.
30. Roy S., Brehm M., Sharma S., Wu F., Maltsev D.S., Halstenberg P., Gallington L.C., Mahurin S.M., Dai S., Ivanov A.S., Margulis C.J., Bryantsev V.S. “Unraveling Local Structure of Molten Salts via X-ray Scattering, Raman Spectroscopy, and Ab Initio Molecular Dynamics”, Journal of Physical Chemistry B, Vol. 125 (22), 2021, pp. 5971 – 5982.
31. Roy S., Sharma S., Karunaratne W.V., Wu F., Gakhar R., Maltsev D.S., Halstenberg P., Abeykoon M., Gill S.K., Zhang Y., Mahurin S.M., Dai S. “X-ray scattering reveals ion clustering of dilute chromium species in molten chloride medium”, Chemical Science, Vol. 12 (23), 2021, pp. 8026 – 8035.
32. Liu X., Ronne A., Yu L.-C., Liu Y., Ge M., Lin C.-H., Layne B., Halstenberg P., Maltsev D.S., Ivanov A.S., Antonelli S., Dai S. “Formation of three-dimensional bicontinuous structures via molten salt dealloying studied in real-time by in situ synchrotron X-ray nano-tomography”, Nature Communications, Vol. 12 (1), 2021, Article number 3441.

Patents

1. V. A. Volkovich, B. D. Vasin, D. S. Maltsev, D. E. Aleksandrov, Current-free method of producing uranium (V) in molten alkali chlorides, RF Patent 2518426, 2014.
2. V. A. Volkovich, B. D. Vasin, D. S. Maltsev D. E. Aleksandrov, Purification method of irradiated nuclear fuel. RF Patent 2499306, 2013.