INFLUENCE OF ADSORBED METHANE ON THE STATE OF WATER IN THE INTERPARTICLE GAPS OF METHYLSILICA AM-1
DOI:
https://doi.org/10.15407/dopovidi2024.01.064Keywords:
methane, adsorption, hydration, hydrophobic silica, methane hydratesAbstract
Using low-temperature 1H NMR spectroscopy, the structure of adsorption complexes of water in the interparticle gaps of hydrophobic methylsilica AM-1 powder and the impact of water association on methane hydrate formation were studied. It is shown that with an increase in the mechanical processing time of a methylsilica sample leads to a higher proportion of weakly associated water, attributed to a reduction in the amount of strongly associated water. The study proposes that, in addition to mobile methane hydrates, a certain quantity of clathrate-type methane hydrates forms at the interphase boundary of AM-1 methylsilica. They are formed in liquid water through the dissolution of gaseous methane. Since both water and methane in clathrates are not observed in liquid NMR spectra, a plausible explanation for the decrease in the intensity of the narrow signal of one of the forms of strongly associated water (WAW2) with temperature may be an increase in the number of clathrate forms of adsorbed methane as temperature decreases.
Downloads
References
Yaminsky, V. V. & Vogler, E. A. (2001). Hydrophobic hydration. Curr. Opin. Colloid Interface Sci., 6, pp. 342- 349. https://doi.org/10.1016/S1359-0294(01)00104-2
Chandler, D. (2005). Interfaces and the driving force of hydrophobic assembly. Nature, 437, pp. 640-647. https:// doi.org/10.1038/nature04162
Snyder, P. W., Lockett, M. R., Moustakas, D. T. & Whitesides, G. M. (2014). Is it the shape of the cavity, or the shape of the water in the cavity? Eur. Phys. J. Spec. Top., 223, pp. 853-889. https://doi.org/10.1140/epjst/e2013- 01818-y
Imai, T. & Hirata, F. (2005). Hydrophobic effects on partial molar volume. J. Chem. Phys., 122, 094509. https:// doi.org/10.1063/1.1854626
Mao, W. L., Mao, H.-k., Goncharov, A. F., Struzhkin, V. V., Gou, Q., Hu, J., Shu, J., Hemley, R. J., Somayazulu, M.
& Zhao, Y. (2002). Hydrogen clusters in clathrate hydrate. Science, 297, pp. 2247-2249. https://doi.org/10.1126/ science.1075394
Chou, I.-M., Sharma, A., Burruss, R. C., Shu, J., Mao, H.-k., Hemley, R. J., Goncharov, A. F., Stern, L. A. & Kirby, S. H. (2000). Transformations in methane hydrates. Proc. Natl. Acad. Sci. USA, 97, pp. 13484-13487. https://doi.org/10.1073/pnas.250466497
Somayazulu, M., Shu, J., Zha, C.-s., Goncharov, A. F., Tschauner, O., Mao, H.-k. & Hemley, R. J. (2008). In situ high-pressure x-ray diffraction study of H2O ice VII. J. Chem. Phys., 128, 064510. https://doi.org/ 10.1063/1.2813890
Gun’ko, V. M., Turov, V. V. & Krupska, T. V. (2018). Interfacial behavior of methane and organic solvents with low freezing points upon interaction with hydrophilic and hydrophobic nanosilicas. Him. Fiz. Tehnol. Pover- hni, 9, No. 2, pp. 107-123. https://doi.org/10.15407/hftp09.02.107
Gun’ko, V. M., Turov, V. V., Krupska, T. V. & Pakhlov, E. M. (2017). Behavior of water and methane bound to hydrophilic and hydrophobic nanosilicas and their mixture. Chem. Phys. Lett., 690, pp. 25-30. https://doi. org/10.1016/j.cplett.2017.10.039
Pat. 105151 UA, IPC В01J 2/10, The method of compaction of nanosilica, Krupska, T. V., Turov, V. V., Barvinchenko, V. N., Filatova, K. O., Suvorova, L. A. & Kartel, M. T., Publ. 10.03.2016 (in Ukrainian).
Krupskaya, T. V., Turov, V. V., Barvinchenko, V. M., Filatova, K. O., Suvorova, L. A., Iraci, G. & Kartel, M. T. (2017). Influence of the “wetting—drying” compaction on the adsorptive characteristics of nanosilica A-300. Adsorp. Sci. Technol., 36, pp. 300-310. https://doi.org/10.1177/0263617417691768
Gun’ko, V. M., Turov, V. V., Pakhlov, E. M., Krupska, T. V. & Charmas, B. (2018). Effect of water content on the characteristics of hydro-compacted nanosilica. Appl. Surf. Sci., 459, pp. 171-178. https://doi.org/10.1016/j. apsusc.2018.07.213
Gun’ko, V. M., Turov, V. V., Krupska, T. V. & Pakhlov, E. M. (2017). Behavior of water and methane bound to hydrophilic and hydrophobic nanosiliсas and their mixture. Chem. Phys. Lett., 690, pp. 25-30. https://doi. org/10.1016/j.cplett.2017.10.039
Gun’ko, V. M. & Turov, V. V. (2013). Nuclear magnetic resonance studies of interfacial phenomena. Boca Raton: CRC Press. https://doi.org/10.1201/b14202
Turov, V. V. & Gun’ko, V. M. (2011). Clustered water and ways of its use. Kiev: Naukova Dumka (in Russian).
Gun’ko, V. M., Turov, V. V., Bogatyrev, V. M., Zarko, V. I., Leboda, R., Goncharuk, E. V., Novza, A. A., Turov, A. V. & Chuiko, A. A. (2005). Unusual properties of water at hydrophilic/hydrophobic interfaces. Adv. Colloid Inter- face Sci., 118, pp. 125-172. https://doi.org/10.1016/j.cis.2005.07.003
Downloads
Published
How to Cite
Issue
Section
License
Copyright (c) 2024 Reports of the National Academy of Sciences of Ukraine
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.
