Self-diffusion of water molecules after contact with silicon-containing compounds

• Published in: I͡A︡derna fizyka ta enerhetyka Vol. 19; no. 2; pp. 131 - 135
• Main Authors: Slisenko, V.I., Vasylkevych, O.A., Mazina, N.I., Karmazina, T.V.
• Format: Journal Article
• Language: English; Ukrainian
• Published: Institute for Nuclear Research, National Academy of Sciences of Ukraine 25.06.2018
• Subjects: aerosil; chalcedony; crystal-like and amorphous silica; quasi-elastic scattering of slow neutrons; self diffusion coefficient; silicon-containing compounds; spongolit
• ISSN: 1818-331X; 2074-0565
• DOI: 10.15407/jnpae2018.02.131

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.