STRUCTURAL STUDY OF THE LAMELLAR TO COLUMNAR TRANSITION IN THERMOTROPIC LIQUID CRYSTALS : THE THERMOTROPIC CUBIC PHASE OF SOME PHASMIDIC MOLECULES

A. Levelut , Y. Fang

The thermotropic mesomorphism of four-chains phasmids is similar to that of lyotropic systems. A cubic Im3m mesophase can be detected between a lamellar phase on one side and a columnar phase on the other side. Moreover, the same cubic phase is found for some three-chains phasmids. The lattice cell unit of this phase has been measured for several pure compounds and for binary mixtures. These measurements are consistent with a model of the molecular organisation in which two labyrinthes, each made of two molecular layers, are delimited by a periodic minimal balance surface. The layer thicknesses and the mean chain area are calculated on the basis of this model.

Domaines: Articles anciens

A. Levelut, Y. Fang. STRUCTURAL STUDY OF THE LAMELLAR TO COLUMNAR TRANSITION IN THERMOTROPIC LIQUID CRYSTALS : THE THERMOTROPIC CUBIC PHASE OF SOME PHASMIDIC MOLECULES. Journal de Physique Colloques, 1990, 51 (C7), pp.C7-229-C7-236. ⟨10.1051/jphyscol:1990722⟩. ⟨jpa-00231121⟩