Pressure studies on two discotic liquid crystals

Raja, V. N. ; Shashidhar, R. ; Chandrasekhar, S. ; Boehm, R. E. ; Martire, D. E. (1985) Pressure studies on two discotic liquid crystals Pramana - Journal of Physics, 25 (1). L119-L122. ISSN 0304-4289

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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 the D-I transition, implying that despite the drastic change in the molecular order at this transition, the associated volume change is extremely small.

Item Type:Article
Source:Copyright of this article belongs to Indian Academy of Sciences.
Keywords:Discotic Liquid Crystals; Columnar Mesophase; Pressure Studies; Phase Diagrams
ID Code:7858
Deposited On:25 Oct 2010 10:05
Last Modified:16 May 2016 17:58

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