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http://hdl.handle.net/2289/2496
Title: | Effect of skew cybotactic structure on the optical properties of a nematogen with a lateral cyano substituent |
Authors: | Madhusudana, N.V. Moodithaya, K.P.L. Suresh, K.A. |
Issue Date: | Oct-1983 |
Publisher: | Gordon and Breach Science Publishers. |
Citation: | Molecular Crystals and Liquid Crystals, 1983, Vol.99, p239-247 |
Abstract: | We report an unusual thermal variation of the ordinary refractive index (no) of the nematogenic compound 2-cyano-4-heptyl-phenyl-4'-pentyl-4-biphenyl carboxylate, which has a cyano group making a large angle (~60°) with the molecular axis. As the sample is cooled from the NI transition point, no initially decreases as usual, but on further cooling it shows an increasing trend after reaching a broad minimum. On the other hand, the extraordinary index ne shows the normal temperature variation. X-ray investigations of a monodomain sample show that the nematic has a skewed cybotactic type of short-range order, the tilt angle increasing considerably as the temperature is lowered from the NI transition point. We have made a model calculation to explain the temperature variation of no in terms of the variation of the tilt angle. |
Description: | Restricted Access. Paper presented at the 9th international conference on liquid crystals held at Bangalore in 1982. |
URI: | http://hdl.handle.net/2289/2496 |
ISSN: | 1058-725X |
Alternative Location: | http://dx.doi.org/10.1080/00268948308072045 |
Copyright: | 1983 OPA (Overseas Publishers Association) N.V. |
Appears in Collections: | Research Papers (SCM) |
Files in This Item:
File | Description | Size | Format | |
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1983 MCLC V99 p239.pdf Restricted Access | Restricted Access | 271.08 kB | Adobe PDF | View/Open Request a copy |
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