Ядерна фізика та енергетика Nuclear Physics and Atomic Energy   ISSN: 1818-331X (Print), 2074-0565 (Online)   Publisher: Institute for Nuclear Research of the National Academy of Sciences of Ukraine   Languages: Ukrainian, English, Russian   Periodicity: 4 times per year   Open access peer reviewed journal

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V. I. Slisenko¹, O. A. Vasylkevych^1,*, N. I. Mazina¹, T. V. Karmazina<sup>2

1</sup> Institute for Nuclear Research, National Academy of Sciences of Ukraine, Kyiv, Ukraine
² Institute of Colloid and Water Chemistry, National Academy of Sciences of Ukraine, Kyiv, Ukraine

^*Corresponding author. E-mail address: a.vas@i.ua

Abstract: Influence of crystalline and amorphous silica on the diffusion coefficients of water molecules according to the experimental data on quasi-elastic scattering of slow neutrons is quantified. It was established that after the contact of silicon-containing compounds of natural origin chalcedony and spongolit with water, the mechanisms of its self-diffusion are significantly changed: self-diffusion is carried out only by the mechanism of continuous diffusion; the magnitude of the total self-diffusion coefficient of water molecules decreases and there is no contribution from the activation mechanism of self-diffusion by at least 24 hours after separation of the solid phase from the liquid. The pyrogenic amorphous silica has relatively little effect on the diffusion of water molecules.

Keywords: quasi-elastic scattering of slow neutrons, self diffusion coefficient, crystal-like and amorphous silica, silicon-containing compounds, aerosil, spongolit, chalcedony.

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