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Journal of Lipid Research, Vol 26, 1142-1150, Copyright © 1985 by Lipid Research, Inc.

ARTICLES

Thermotropic mesomorphism of cholesteryl myristate. An electron diffraction study

DL Dorset

Electron diffraction measurements on heated or cooled microcrystals of cholesteryl myristate, which are grown from solution or epitaxially, on benzoic acid, provide further structural information about its mesomorphic behavior. At subambient temperatures (less than -65 degrees C), a new crystal form is observed which doubles the unit cell axes in the (001) plane. At the major crystalline in equilibrium with smectic endotherm at 70 degrees C, evidence is found for the existence of a pretransition crystal packing. The smectic phase, which coexists with this pretransition crystal form, is composed of relatively well-ordered layers, probably with a monolayer-type packing. Cooling the cholesteric phase to the crystalline form causes a rotational disorder which is not yet understood.
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