Formation of methane hydrate from polydisperse ice powders

Article Abstract:

Neutron diffraction runs and gas-consumption experiments based on pressure-volume-temperature measurements are performed to evaluate the kinetics of methane hydrate formation from hydrogenated and deuterated ice powder samples. The permeation coefficient D is close to the energy of breaking hydrogen bonds in ice Ih and indicates that this process is the rate-limiting step in hydrate formation from ice in the slower diffusion-controlled part of the reaction.

Methane, Neutrons, Neutron diffraction, Hydrogen bonding, Hydrogen bonds

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Formation of porous gas hydrates from ice powders: diffraction experiments and multistage model

Article Abstract:

A study of gas hydrates grown at gas-ice interfaces which were examined by electron microscopy and found to have a submicron porous structure, is presented. Diffraction experiments were also performed with methane in hydrogenated samples and the isotopic differences were found to be insignificant.

Observations, Electron microscopy, Gas hydrates, Structure

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Comment on "Hofmeister effects in pH measurements: role of added salt and co-ions"

Article Abstract:

pH is defined by the activity of protons in aqueous solutions. It is stated that the activity can be determined by a hydrogen electrode and secondarily by a glass electrode with the usual calibrations.

Electrodes, Hydrogen-ion concentration, Aqueous solution reactions, pH

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