Internal heteroatom substitution and the layer packing of polymethylene chains

Article Abstract:

Issues concerning the use of electron crystallography and infrared spectroscopy to investigate the layer packing of polymethylene chains and internal heteroatom substitution are reported.

Observations, Crystallography, Infrared spectroscopy, Amines, Ethers, Ethers (Class of compounds)

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Conformation of the acyl chains in diacylphospholipid gels by IR spectroscopy

Article Abstract:

A new study focuses on the conformational disorder of the acyl chains in the highly ordered gel phase of a diacylphosphatidylcholine bilayer. IR spectroscopy is used to establish the conformation of the CH2-CH2 bonds.

Lipid membranes, Molecular rotation, Bilayer lipid membranes

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Phase separation of a metastable three-component n-paraffin solid solution

Article Abstract:

The phase separation of a three-component assembly of equimolar amounts of n-C28H58, n-C32H66 and n-C36H74 has been studied. Its crystal structure reveals a pseudo n-C33H68 layer in the the space group A2(sub 1)am. It forms a superlattice after being exposed at room temperature for six days. Its crystal structure is a series of solid solution lamellar layers. Another superlattice develops after 16 months with a spacing twice as large as the first one. Its crystal structure is a sequence of nearly pure n-alkane chain layers.

Phase transformations (Statistical physics), Phase transitions (Physics), Crystals, Crystal structure, Superlattices as materials, Superlattices, Paraffin wax

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