Interfacial gas enrichment at hydrophobic surfaces and the origin of promotion of gas hydrate formation by hydrophobic solid particles

Nguyen, Ngoc N., Nguyen, Anh V., Steel, Karen M., Dang, Liem X. and Galib, Mirza (2017) Interfacial gas enrichment at hydrophobic surfaces and the origin of promotion of gas hydrate formation by hydrophobic solid particles. Journal of Physical Chemistry C, 121 7: 3830-3840. doi:10.1021/acs.jpcc.6b07136


Author Nguyen, Ngoc N.
Nguyen, Anh V.
Steel, Karen M.
Dang, Liem X.
Galib, Mirza
Title Interfacial gas enrichment at hydrophobic surfaces and the origin of promotion of gas hydrate formation by hydrophobic solid particles
Journal name Journal of Physical Chemistry C   Check publisher's open access policy
ISSN 1932-7447
1932-7455
Publication date 2017-02-23
Sub-type Article (original research)
DOI 10.1021/acs.jpcc.6b07136
Open Access Status Not yet assessed
Volume 121
Issue 7
Start page 3830
End page 3840
Total pages 11
Place of publication Washington, DC, United States
Publisher American Chemical Society
Collection year 2018
Language eng
Formatted abstract
Hydrophobic solid surfaces have been found to promote the formation of gas hydrates effectively and thus help to realize the immense potential applications of hydrates in many sectors such as energy supply, gas storage and transportation, gas separation, and CO2 sequestration. Despite the well-known effectiveness, the molecular mechanism behind the promotion effect has not been thoroughly understood. In this work, we used both simulation and experimental means to gain insights into the microscopic level of the influence of hydrophobic solid surfaces on gas hydrate formation. On one hand, our simulation results show the presence of an interfacial gas enrichment (IGE) at hydrophobic surface and a gas depletion layer at hydrophilic surface. In the meantime, the analysis of water structure near the hydrophobic solid interface based on the molecular trajectories also shows that water molecules tend to get locally structured near a hydrophobic surface while becoming depressed near a hydrophilic surface. On the other hand, the experimental results demonstrate the preferential formation of gas hydrate on a hydrophobic surface. The synergic combination of simulation and experimental results points out that the existence of an IGE at hydrophobic solid surface plays a key role in promoting gas hydrate formation. This work advances the molecular level understanding of the role of hydrophobicity in governing the gas hydrate as well as interfacial phenomena in general.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
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