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Protocol for Measuring the Thermal Properties of a Supercooled Synthetic Sand-water-gas-methane Hydrate Sample
Published on: March 21, 2016
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CH4 Hydrate Formation between Silica and Graphite Surfaces: Insights from Microsecond Molecular Dynamics Simulations.
Zhongjin He1, Praveen Linga1, Jianwen Jiang1
1Department of Chemical and Biomolecular Engineering, National University of Singapore , Singapore 117576, Singapore.
Langmuir : the ACS Journal of Surfaces and Colloids
|October 10, 2017
Summary
Surface properties significantly impact methane (CH4) hydrate formation. Hydrophilic silica promotes nucleation, while hydrophobic graphite hinders it by forming nanobubbles and ordered water layers.
Area of Science:
- * Materials Science
- * Physical Chemistry
- * Geochemistry
Background:
- * Methane (CH4) hydrate formation is crucial for energy resources and climate regulation.
- * Interfacial phenomena between gas/water and solid surfaces influence hydrate nucleation and growth.
- * Silica and graphite surfaces present distinct chemical and physical properties affecting molecular interactions.
Purpose of the Study:
- * To investigate the influence of hydrophilic silica and hydrophobic graphite surfaces on CH4 hydrate formation.
- * To elucidate the molecular mechanisms governing hydrate nucleation and growth at these interfaces using microsecond simulations.
- * To compare the roles of surface chemistry, nanobubble formation, and interfacial water ordering.
Main Methods:
- * Performed microsecond molecular dynamics simulations of CH4/water systems.
- * Investigated gas/water two-phase systems between silica and graphite surfaces.
- * Simulated CH4/water homogeneous solution systems with graphite surfaces.
Main Results:
- * Hydrophilic silica surfaces promoted CH4 hydrate nucleation in the bulk due to high aqueous CH4 concentration and cylindrical nanobubbles.
- * Hydrophobic graphite surfaces inhibited nucleation by forming flat nanobubbles with low CH4 concentration and ordered water bilayers.
- * Graphite surfaces in homogeneous solutions facilitated nucleation and hydrate growth through CH4 adsorption and induced interfacial water ordering.
Conclusions:
- * Surface properties, specifically hydrophilicity/hydrophobicity and functional groups (silanols), critically control CH4 hydrate formation.
- * Silica's silanol groups stabilize incipient hydrate, while graphite's CH4 adsorption and water ordering promote hydrate-graphite contact.
- * Understanding these interfacial effects is key to controlling and utilizing CH4 hydrates.
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