Chain length distribution and the lamellar crystal structure of a paraffin wax

Article Abstract:

The three-dimensional crystal structure of an artificial linear paraffin wax with a near Gaussian distribution of chain length and the known polydisperity (M(sub W)/M(sub n) of 1.003 was determined from electron diffraction intensity data. A distribution of fractional methylene group occupancies near the chain ends is suggested by the falloff of I(ool) but a more accurate vacancy model can be found from the known chain distribution of the wax.

Methyl groups, Methyl group, Paraffin wax

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Crystal structure of MCM-70: A microporous material with high framework density

Article Abstract:

The program FOCUS is used to determine the crystal structure of the borosilicate MCM-70 (siliceous framework formula Si12O24), from synchrotron powder diffraction data. The measurement results suggest sample heterogeneity, that is, a portion of the sample that is strongly coupled to hydrogen and efficiently cross polarizes and another portion that does not.

Silicates, Electrons, Electron diffraction, Properties

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Crystal structure of MCM-70: A microporous material with high framework density

Article Abstract:

The program FOCUS is used to determine the crystal structure of the borosilicate MCM-70 (siliceous framework formula Si12O24), from synchrotron powder diffraction data. The measurement results suggest sample heterogeneity, that is, a portion of the sample that is strongly coupled to hydrogen and efficiently cross polarizes and another portion that does not.

Zeolites, X-rays, X-ray diffraction, Spectra

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