Title

Rheological Properties of Bent-Core Liquid Crystals

Publication Title

Soft Matter

Publication Date

2009

Document Type

Article

Disciplines

Physics

Abstract

We show that bent-core liquid crystalline materials exhibit non-Newtonian flow in their optically isotropic liquid phase. We conjecture that this behavior is due to the existence of nanostructured, fluctuating clusters composed of a few smectic-like layers. Shear alignment of these clusters explains the shear thinning observed in bent-core liquid crystals having either a nematic phase or non-modulated smectic phase. By contrast, smectogens having a modulated smectic phase do not shear thin at low shear rates, but even show a slight shear thickening which may be due to entanglements of wormlike and/or helical clusters.

Comments

Available on publisher's site at http://dx.doi.org/10.1039/b907261f.

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