On the effects of doping calamitic and discotic nematics with materials of the opposite aspect ratio

Phillips, T. J.; Minter, Victoria; Jones, John C.

doi:10.1080/02678299608032866

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“…None of the compounds prepared exhibited a nematic phase, and so, to study in more detail the border-line between discotic and calamitic behaviour, we prepared binary mixtures of compound 9a (with a hexagonal columnar phase) and compound 7a (with a crystal B phase). The usual problem of poor miscibility and ready phase separation in mixtures of calamitic and discotics 28 was expected to be minimised for these two components since they have identical core structures which would be expected to enhance the interactions between the rod-like and disc-like molecules.…”

Section: Resultsmentioning

confidence: 99%

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et al. 2001

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The syntheses of novel octa-and tetra-substituted systems based on tetrabenz[a,c,h,j]anthracene are reported. The disc-shaped octa-substituted material exhibits a columnar mesophase, whereas the tetra-substituted material exhibits a lamellar phase. Binary mixtures of the two materials were examined in order to explore the change over from discotic to calamitic behaviour as a function of concentration. At the crossover point, the possibility of the formation of a biaxial phase was investigated.{Basis of a presentation given at Materials Discussion No. 4,[11][12][13][14]

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Section: Resultsmentioning

confidence: 99%