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Title: Dielectric properties of 4'-n-alkyl-4-cyanobiphenyls in their nematic phases
Authors: Ratna, B.R.
Shashidhar, R.
Keywords: Nematic liquid crystals
Dielectric anisotropy
Issue Date: 1976
Publisher: Indian Academy of Sciences, Bangalore, India.
Citation: Pramana, 1976, Vol. 6, p278-283.
Abstract: The principal dielectric constants of the pentyl to octyl derivatives of 4'-n-alkyl-4-cyanobiphenyl have been measured as functions of temperature in their nematic and isotropic phases. All the compounds exhibit a strong positive dielectric anisotropy due to the presence of a large dipole moment along the major molecular axis. The principal dielectric constants ε11 and εL as well as the anisotropy ∆ε decrease with increasing alkyl chain length. The experimental value of έ = ⅓( ε11+ 2εL) decreases with decreasing temperature, and is throughout less than the extrapolated isotropic value, in conformity with the model of antiferro- electric short range order propored by Madhusudana and Chandrasekhar.
ISSN: 0304-4289
Copyright: Indian Academy of Sciences, Bangalore, India.
Appears in Collections:Research Papers (SCM)

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