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Title: | On the polymorphism of the smectic A phases of highly polar compounds |
Authors: | Madhusudana, N.V. |
Keywords: | Smectic A Polymorphism Reentrant phases Bilayer Smectics Induced Smectic Phases |
Issue Date: | Oct-1983 |
Publisher: | Indian Academy of Sciences, Bangalore, India. |
Citation: | Proceedings of the Indian Academy of Sciences (Chemical Sciences), 1983, Vol. 92, p509 -525. |
Abstract: | The smectic A phase is characterized by a layered arrangement of rod-like molecules, with the average orientation of the molecules normal to the layers and a liquid-like organization within the layers. When the molecules have a strongly polar end group (like C=N, -NO2 etc.,), neighbouring molecules prefer an antiparallel orientation. This results in a bilayer structure, with a layer spacing much larger than the molecular length. In many compounds, the structure of the bilayer is sensitive to temperature (or pressure). This results in some interesting phenomena: (a) reentrant phases, as for example, the appearance of a nematic phase below the temperature range of existence of the A phase; (b) a number of polymorphic forms of smectic A; and (c) an 'induced smectic A' phase when the compounds with the highly polar terminal groups are mixed with weakly polar compounds even when neither compound by itself exhibits the A phase. This article gives a brief summary of recent results on all these aspects. |
URI: | http://hdl.handle.net/2289/1057 |
ISSN: | 0253-4134 |
Copyright: | Indian Academy of Sciences, Bangalore, India. |
Appears in Collections: | Research Papers (SCM) |
Files in This Item:
File | Description | Size | Format | |
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1983 Proc Indian Acad Sci (Chem Sci) V92 p509.pdf | 17p. | 757.45 kB | Adobe PDF | View/Open |
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