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Lattice constants and thermal expansion coefficient of air clathrate hydrate in deep ice cores from Vostok, Antarctica

Article Abstract:

Issues concerning the use of single-crystal X-ray diffraction to measure the temperature-dependent lattice constant of air hydrates in deep ice cores from Vostok, Antarctica, are discussed. It was possible to identify the thermal expansion coefficient.

Antarctica, Lattice dynamics, Ice, Expansion (Heat), Thermal expansion

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Texture change of ice on anomalously preserved methane clathrate hydrate

Article Abstract:

A confocal scanning microscope was used to observe growth and texture change of ice due to the dissociation of methane gas clathrate hydrate (CH4 hydrate). The experiments were done under CH(sub 4) gas atmospheric pressure and isothermal conditions between 170 and 268 K.

Science & research, Analytical Laboratory Instrument Manufacturing, Analytical instruments, Scanning Microscopy, Methane, Hydrates

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Highly selective encaging of carbon dioxide molecules in the mixed carbon dioxide and nitrogen hydrate at low temperatures

Article Abstract:

The structural identification and guest compositions of the mixed CO2 and N2 hydrates at low temperature conditions were investigated by both theoretical predictions and experimental measurements. The compositional analysis suggests that a favorable encaging of CO2 in the mixed hydrate could be obtained by the hydrate formation at low temperatures and relative amount of CO2 molecules in the mixed hydrates increases with a decrease of temperature.

All Other Basic Inorganic Chemical Manufacturing, Industrial Gas Manufacturing, Industrial gases, Industrial inorganic chemicals, not elsewhere classified, Carbon Dioxide, Nitrogen Compounds, Temperature measurements, Temperature measurement, Thermal properties, Chemical properties

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