Behavior of water and methane bound to hydrophilic and hydrophobic nanosilicas and their mixture

[Display omitted] •Water pre-adsorbed onto nanosilica affects adsorption of methane.•Methane adsorbed onto hydrated nanosilica affects bound water structure.•Mechanical treatment of wetted nanosilica affects the texture and adsorption capacity. Methane adsorption onto hydrated (0.1 g/g) initial and...

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Bibliographic Details
Published in:Chemical physics letters 2017-12, Vol.690, p.25-30
Main Authors: Gun'ko, Vladimir M., Turov, Vladimir V., Krupska, Tetyana V., Pakhlov, Eugeniy M.
Format: Article
Language:English
Subjects:
Bound water
Hydrophilic nanosilica
Hydrophobic nanosilica
Methane adsorption
Structural organization
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Summary:[Display omitted] •Water pre-adsorbed onto nanosilica affects adsorption of methane.•Methane adsorbed onto hydrated nanosilica affects bound water structure.•Mechanical treatment of wetted nanosilica affects the texture and adsorption capacity. Methane adsorption onto hydrated (0.1 g/g) initial and compacted nanosilica A-50 and compacted A-50/hydrophobic AM1 (based on nanosilica A-300) and water behavior vs. temperature were analyzed using 1H NMR and theoretical methods. Methane adsorption increases with temperature because of changes in structure of mobile water. Stronger compaction of A-50 than that of A-50/AM1 (due to negative effect of AM1 preventing formation of tight contacts between A-50 nanoparticles) leads to decrease in adsorption of methane onto dense A-50 alone. These effects cause the difference in temperature behavior of bound water.
ISSN:0009-2614
1873-4448
DOI:10.1016/j.cplett.2017.10.039