Title:	Thermodynamic, optical and dielectric studies of the homologous members of columnar discotic compound Rufigallol hexa-n-alkoxylates
Authors:	Dhar, R. Kumar, Sandeep Gupta, Meenal Agrawal, V.K.
Keywords:	Hexagonal columnar phase Dielectric permittivity and loss Anisotropy Conductivity
Issue Date:	May-2008
Publisher:	Elsevier B.V.
Citation:	Journal of Molecular Liquids, 2008, Vol.141, p19
Abstract:	Thermodynamic, optical texture and frequency dependent dielectric studies of re-synthesized discotic compounds Rufigallol hexa-n-alkoxylates (for n = 6, 7, 8, 9) having wide temperature range hexagonal columnar (colh) mesophase have been carried out. The mesophase and their transition temperatures have been determined by using polarizing microscope and differential scanning calorimetry. Dielectric permittivity parallel (ε||′) and perpendicular (εperpendicular′) to column axis have been determined. Using these two sets of data, dielectric anisotropy (Δε′ = ε||′ − εperpendicular′) has been obtained which has been found to be positive throughout the entire range of the colh mesophase for all of the four compounds of this series. No relaxation phenomenon has been observed in the frequency range of measurement i.e. 10 Hz to 10 MHz. The DC conductivity of these compounds has been found to be rather low (~ 10− 10 to 10− 11 S m− 1). All the dielectric parameters show odd-even effect with the variation of n.
Description:	Restricted Access.
URI:	http://hdl.handle.net/2289/3881
ISSN:	0167-7322
Alternative Location:	http://dx.doi.org/10.1016/j.molliq.2008.02.010
Copyright:	2008 Elsevier B.V.
Appears in Collections:	Research Papers (SCM)

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