Liquid crystals of disc-like molecules

@article{Chandrasekhar1977LiquidCO,
  title={Liquid crystals of disc-like molecules},
  author={Sivaramakrishna Chandrasekhar and B. K. Sadashiva and Kattera A. Suresh},
  journal={Pramana},
  year={1977},
  volume={9},
  pages={471-480}
}
Thermotropic mesomorphism has been observed in pure compounds consisting of simple disc-like molecules, viz., benzene-hexa-n-alkanoates. Thermodynamic, optical and x-ray studies indicate that the mesophase is a highly ordered lamellar type of liquid crystal. Based on the x-ray data, a structure is proposed in which the discs are stacked one on top of the other in columns that constitute a hexagonal arrangement, but the spacing between the discs in each column is irregular. Thus the structure… 
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References

SHOWING 1-7 OF 7 REFERENCES
Disclinations in the Carbonaceous Mesophase
Abstract When the organic precursors to coke and manufactured graphite (petroleum and coal-tar pitches) are carbonized, large, flat, polynuclear aromatic molecules are formed by the reactions of…
The formation of graphitizing carbons from the liquid phase
The Problems of Polymorphism in Liquid Crystals
Abstract We deal with the actual position of the system of liquid crystalline modifications. This system is based on the relations of miscibility of the liquid crystalline modifications and on their…
Light scattering in organic plastic crystals
Brillouin-scattering measurements are reported for the hexagonal plastic crystal norbornylene. The five independent elastic constants at 296 K are determined from the observed Brillouin shifts to be…
X-ray diffraction
The scattering of x-rays by matter with accompanying variation in intensity in different directions …
Unified Hydrodynamic Theory for Crystals, Liquid Crystals, and Normal Fluids
Hexahydroxybenzene and Some of its Derivatives1