Unusual patterns in the growth of smectic liquid crystals

Pratibha, R. ; Basappa, G. ; Madhusudana, N. V. (1995) Unusual patterns in the growth of smectic liquid crystals Solid State Phenomena, 42-43 . pp. 27-38. ISSN 1012-0394

Full text not available from this repository.

Official URL: http://www.scientific.net/SSP.42-43.27

Related URL: http://dx.doi.org/10.4028/www.scientific.net/SSP.42-43.27


Smectic liquid crystals have a layered arrangement of rod-like organic molecules. In the smectic A phase the average orientation direction of the molecules is parallel to the layer normal while in the smectic C, it is at an oblique angle. Usually when smectic A liquid crystals separate from the isotropic phase, they do so in the form of short rod-like structures called "batonnets" which are made of focal conic domains. It is now known that the batonnets arise because of the positive interfacial tension anisotropy γ∥ - γ⊥ of the smectic, in which the subscripts refer to directions ~arallel and perpendicular to the layer normal.In the present article we summarise our recent studies on some binary systems in which γ∥ - γ⊥ is negative, leading to some unusual structures like highly elongated cylinders which are stabilised by concentration gradients. We find other novel structures like discs, and 'ink-bottles' etc, when the interfacial tension anisotropy changes sign during the growth of smectics. In the smectic C phase, we find additional dynamics when the cylinders grow; soliton-like objects are generated at one end and propagate along the cylinder to the other end. Further, the cylinders as a whole have physical locomotion as they grow from the isotropic phase. We discuss the results in terms of simple physical models.

Item Type:Article
Source:Copyright of this article belongs to Trans Tech Publications Inc.
ID Code:76079
Deposited On:29 Dec 2011 07:35
Last Modified:29 Dec 2011 07:35

Repository Staff Only: item control page