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Production of Spherical Boron-Carbide Particles Encapsulated in a Graphite Shell

  • NANOSTRUCTURES, NANOTUBES
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Abstract

Laser ablation makes it possible to obtain boron-carbide nanoparticles suitable for subsequent use in boron neutron capture therapy. However, particles of boron and boric acid are formed in parallel. Boric acid is harmful to the human body, and boron can naturally form boric acid. A method is proposed for reducing the toxicity of the synthesis of boron-carbide nanoparticles by laser ablation by adding free carbon to the reaction and replacing the traditionally used buffer medium, ethyl acetate. Purified water is used as a dispersing medium. It is shown that the described technology has prospects for reducing the level of toxicity due to the choice of a suitable buffer medium. The formation of boron carbide is recorded by transmission electron microscopy and XRD analysis. The formed particles are predominantly spherical in shape and have a carbon shell. A mechanism is proposed for the formation of such a shell due to the diffusion of carbon from the bulk of the particle through the domain boundaries.

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ACKNOWLEDGMENTS

We are grateful to A.G. Ivanova for help in carrying out the powder X-ray diffraction experiments.

Funding

This work was supported by a grant from the President of the Russian Federation MD-3790.2021.1.2. Research by P.V. Zinin was supported by the Ministry of Science and Higher Education of the Russian Federation (FFNS-2022-0008).

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Authors and Affiliations

  1. Shubnikov Institute of Crystallography, Federal Research Center Crystallography and Photonics, Russian Academy of Sciences, Moscow, Russia

    I. S. Pavlov & A. L. Vasiliev

  2. Prokhorov Institute of General Physics, Russian Academy of Sciences, Moscow, Russia

    E. V. Barmina, M. I. Zhilnikova & G. A. Shafeev

  3. Scientific and Technological Center for Unique Instrumentation, Russian Academy of Sciences, Moscow, Russia

    I. S. Pavlov & P. V. Zinin

  4. Vereshchagin Institute of High-Pressure Physics, Russian Academy of Sciences, Moscow Troitsk, Russia

    V. P. Filonenko

  5. National Research Center Kurchatov Institute, Moscow, Russia

    A. L. Vasiliev

  6. Moscow Institute of Physics and Technology, 141701, Moscow, Russia

    A. L. Vasiliev

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  1. I. S. Pavlov
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  2. E. V. Barmina
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  3. M. I. Zhilnikova
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  4. G. A. Shafeev
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  5. P. V. Zinin
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  6. V. P. Filonenko
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  7. A. L. Vasiliev
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Correspondence to I. S. Pavlov.

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Pavlov, I.S., Barmina, E.V., Zhilnikova, M.I. et al. Production of Spherical Boron-Carbide Particles Encapsulated in a Graphite Shell. Nanotechnol Russia 17, 290–296 (2022). https://doi.org/10.1134/S2635167622030132

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  • DOI: https://doi.org/10.1134/S2635167622030132

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