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    • Keywords


      Discotic liquid crystals; columnar mesophase; pressure studies; phase diagrams

    • Abstract


      Pressure-temperature diagrams have been studied for two discotic compounds, hexa-n-octyloxytriphenylene and hexa-n-decanoyloxytriphenylene, both of which exhibit the columnar (D) phase at atmospheric pressure. Two interesting results, common to both compounds, have been obtained: (a) in contrast to what is usually observed in liquid crystals of rod-like molecules, the columnar-isotropic (D-I) transition, which is enantiotropic at atmospheric pressure, becomes monotropic at high pressures; (b) dT/dP ≈ 0 for theD-I transition, implying that despite the drastic change in the molecular order at this transition, the associated volume change is extremely small.

    • Author Affiliations


      V N Raja1 R Shashidhar1 S Chandrasekhár1 R E Boehm1 2 D E Martire1 2

      1. Raman Research Institute, Bangalore - 560 080, India
      2. Department of Chemistry, Georgetown University, Washington DC - 20057, USA
    • Dates

  • Pramana – Journal of Physics | News

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      Posted on July 25, 2019

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