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http://hdl.handle.net/2289/914| 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 Cyanobiphenyl |
| 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. |
| URI: | http://hdl.handle.net/2289/914 |
| ISSN: | 0304-4289 |
| Copyright: | Indian Academy of Sciences, Bangalore, India. |
| Appears in Collections: | Research Papers (SCM) |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| 1976 Pramana V6 p278.pdf | 6p. | 219.13 kB | Adobe PDF | View/Open |
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