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|Title: ||Dielectric and high-pressure investigations on a thermotropic cubic mesophase|
|Authors: ||Rao, Shankar D.S.|
Prasad, Krishna S.
|Issue Date: ||May-1999 |
|Publisher: ||American Physical Society|
|Citation: ||Physical Review E, 1999, V.59, p5572|
|Abstract: ||Optically isotropic cubic mesophases, which are commonly exhibited by lyotropic materials, have been
observed in a few thermotropic liquid crystalline systems also. Although the first thermotropic cubic mesophase
was reported about 40 years ago, its existence in diverse systems is only a recent finding. Moreover,
the investigations on this mesophase have mainly concentrated on the structural aspects. While the effect of
pressure has not been reported, only one dielectric measurement seems to have been carried out. In this paper
we present the results of our dielectric and high pressure investigations on a compound exhibiting a thermotropic
cubic mesophase. Two salient results are ~i! a low frequency relaxation mode is observed with a large
dielectric strength with appreciable changes across the columnar-cubic and cubic-smectic C transitions; and ~ii!
the cubic phase ceases to exist when the applied pressure exceeds about 400 bar. [S1063-651X~99!14705-6]|
|Description: ||Restricted Access|
|Copyright: ||1999 The American Physical Society|
|Appears in Collections:||Research Papers (SCM)|
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