clathrate hydrate

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clathrate hydrate

[¦klath‚rāt ′hī‚drāt]
(geochemistry)
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In other words, clathrate hydrates are clathrate compounds in which the host molecule is water and the guest molecule is typically a gas or liquid.
Among the topics are pressure-driven liquid-liquid transformations and corresponding bizarre viscosity behavior, the water proton environment as a possible new water anomaly at the atomic scale, water and biological macromolecules, water-like thermodynamics and dynamic anomalies and the evidence for polymorphism in computer simulations of liquid silica, and a statistical mechanical approach to the thermodynamic stability of clathrate hydrates.
Clathrate hydrates form when water molecules crystallize into a cage-like structure that can contain one or more molecules of natural gas or other hydrocarbons.
Clathrate hydrates primarily occur in one of three crystalline structures (termed sI, sII and sH), although a number of more exotic configurations are known.
It contains well defined and critically evaluated experimentally derived thermophysical and structural data for clathrate hydrates, including the complex systems associated with clathrate hydrates of natural gas.
It is expected that the Clathrate Hydrate Physical Property Database, available on a free and open basis and accessible through the World Wide Web, will facilitate research on and development of technologies relevant to clathrate hydrates by providing reliable, critically evaluated data sets from the scientific literature and an intuitive interface for visualizing and comparing those data sets against one another.
The 89th edition continues the format of the past, with new tables added for atomic radii, composition and properties of common oils and fats, global warming potential of greenhouse gases, weather-related scales, energy content of fuels, properties of gas clathrate hydrates, melting curve of mercury, enthalpy of hydration of gases, and electrical resistivity of graphite materials.
Clathrate hydrates are not chemical compounds, as the sequestered molecules are never bonded to the lattice.
Clathrate hydrates (or gas hydrates) are crystalline water-based solids physically resembling ice, in which small non-polar molecules (typically gases) or polar molecules with large hydrophobic moieties are trapped inside 'cages' of hydrogen bonded water molecules.
Clathrate hydrates are not chemical compounds as the sequestered molecules are never bonded to the lattice.
Sloan and Koh, both affiliated with the Colorado School of Mines, describe all major aspects of natural gas clathrate hydrates in this book/CD-ROM package for engineers and researchers.
Clathrate hydrates are ice-like inclusion complexes between small, usually gaseous guests and crystalline water hosts.

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