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Materials 2014, 7(7), 5146-5168; doi:10.3390/ma7075146

Structural Rheology of the Smectic Phase

1
Department of Chemistry, Nagaoka University of Technology, Nagaoka 940-2188, Japan
2
Department of Materials and Interfaces, Weizmann Institute of Science, Rehovot 76100, Israel
3
Department of Chemistry, Tokyo Metropolitan University, Tokyo 192-0397, Japan
4
Department of Chemistry, National Taiwan University, Taipei 106, Taiwan
*
Author to whom correspondence should be addressed.
Received: 1 April 2014 / Revised: 13 June 2014 / Accepted: 24 June 2014 / Published: 16 July 2014
(This article belongs to the Special Issue Liquid Crystals)
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Abstract

In this review article, we discuss the rheological properties of the thermotropic smectic liquid crystal 8CB with focal conic domains (FCDs) from the viewpoint of structural rheology. It is known that the unbinding of the dislocation loops in the smectic phase drives the smectic-nematic transition. Here we discuss how the unbinding of the dislocation loops affects the evolution of the FCD size, linear and nonlinear rheological behaviors of the smectic phase. By studying the FCD formation from the perpendicularly oriented smectic layers, we also argue that dislocations play a key role in the structural development in layered systems. Furthermore, similarities in the rheological behavior between the FCDs in the smectic phase and the onion structures in the lyotropic lamellar phase suggest that these systems share a common physical origin for the elasticity.
Keywords: soft matter; structural rheology; smectic phase; dislocation loop; focal conic domain; unbinding transition; lamellar phase; onion structure soft matter; structural rheology; smectic phase; dislocation loop; focal conic domain; unbinding transition; lamellar phase; onion structure
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Fujii, S.; Komura, S.; Lu, C.-Y.D. Structural Rheology of the Smectic Phase. Materials 2014, 7, 5146-5168.

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