Structure, composition, and thermal expansion of CO(sub 2) hydrate from single crystal X-ray diffraction measurements

Article Abstract:

The structure and composition of CO(sub 2) hydrate is determined by using single-crystal X-ray diffraction data at 173 K for a crystal grown over heavy water and liquid CO(sub 2). The temperature dependence of the lattice parameters for the single crystal is measured between 123 and 223 K and found to be in good agreement with recent neutron powder diffraction results.

Primary nonferrous metals, not elsewhere classified, Primary Smelting and Refining of Nonferrous Metal (except Copper and Aluminum), Cobalt, Thermal properties, Chemical bonds

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Nuclear magnetic resonance studies of resorcinol-formaldehyde aerogels

Article Abstract:

A detailed study of resorcinol-formaldehyde (RF) aerogels prepared under different processing conditions, [resorcinol]/[catalyst] (R/C) ratios in the starting sol-gel solutions, is reported. The degree of polymerization and the mobility of the cross-linking functional groups in RF aerogels are examined and correlated with the R/C ratios.

Cyclic crudes and intermediates, Cyclic Crude and Intermediate Manufacturing, Formaldehyde, Resorcinol, Nuclear magnetic resonance, Chemical properties, Aerogels, Resorcinols

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Structure, dynamics and ordering in structure I ether clathrate hydrates from single-crystal x-ray diffraction and [super 2]H NMR spectroscopy

Article Abstract:

The structure, dynamics and the ordering of trimethylene oxide (TMO) and ethylene oxide (EO) structure I hydrates are studied. The analysis reveals that the interaction of the dipoles becomes stronger with a decrease in the temperature.

Ethylene Oxide, Analysis, Observations, Nuclear magnetic resonance spectroscopy, X-rays, X-ray diffraction, Spectra, Optical properties, Clathrate compounds

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