Enantiotropic nematic phases of quaternary ammonium halide salts based on trioctadecylamine

Lu, L and Sharma, N and Gowda, GAN and Khetrapal, CL and Weiss, RG (1997) Enantiotropic nematic phases of quaternary ammonium halide salts based on trioctadecylamine. In: Liquid Crystals, 22 (1). pp. 23-28.

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Abstract

The neat phases of a series of quaternary ammonium halides based on trioctadecylamine have been investigated by optical microscopy, differential scanning calorimetry, and H-2 NMR spectroscopy. Phase behaviour depends primarily on the structure of the fourth substituent on nitrogen and the thermal history of the samples. For instance, the iodide salts with methyl, ethyl, or propyl as the fourth substituent form enantiotropic nematic phases, while those with a proton or a longer alkyl substituent exhibit complex phase behaviour that does not include a liquid crystalline phase. Possible reasons are advanced for the unprecedented formation of nematic phases.

Item Type:	Journal Article
Publication:	Liquid Crystals
Publisher:	Taylor and Francis Group
Additional Information:	Copyright of this article belongs to Taylor and Francis Group.
Department/Centre:	Division of Chemical Sciences > Sophisticated Instruments Facility (Continued as NMR Research Centre)
Date Deposited:	03 Jun 2009 06:28
Last Modified:	19 Sep 2010 05:26
URI:	http://eprints.iisc.ac.in/id/eprint/18940

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