Differential thermal analysis (DTA) at high pressures: phase behaviour of pure and gas-saturated liquid crystals up to 270 MPa

The high-pressure phase behaviour of the liquid crystals 4- n-hexyloxy- and 4- n-decyloxy-4'-cyanobiphenyl (60CB and 10OCB) has been studied pure as well as saturated with some gases or gas mixtures (helium, nitrogen, argon, Ar/CO 2 mixtures) at pressures up to 270 MPa with a high-pressure DTA...

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Bibliographic Details
Published in:Thermochimica acta 1994-01, Vol.231, p.169-175
Main Authors: Krombach, R., Schneider, G.M.
Format: Article
Language:English
Subjects:
Chemical thermodynamics
Chemistry
Elements, mineral and organic compounds
Exact sciences and technology
General and physical chemistry
Thermodynamic properties
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Summary:The high-pressure phase behaviour of the liquid crystals 4- n-hexyloxy- and 4- n-decyloxy-4'-cyanobiphenyl (60CB and 10OCB) has been studied pure as well as saturated with some gases or gas mixtures (helium, nitrogen, argon, Ar/CO 2 mixtures) at pressures up to 270 MPa with a high-pressure DTA apparatus. Pure 60CB shows a nematic phase, whereas 100CB exhibits a smetic phase as well as an additional pressure-induced nematic phase above 35 MPa. The nematic and the smectic phases are destabilized under the influence of the gases mentioned above; in particular within the experimental pressure range the pressure-induced nematic phase of pure 10OCB is no longer observed under the influence of the gases and gas mixtures mentioned above with the exception of helium.
ISSN:0040-6031
1872-762X
DOI:10.1016/0040-6031(94)80019-7