Rheological properties of bent-core liquid crystals

被引：66

作者：

Bailey, C. ^{[1
,2
]}

Fodor-Csorba, K. ^{[1
,2
,4
]}

Gleeson, J. T. ^{[1
,2
,3
]}

Sprunt, S. N. ^{[1
,2
,3
]}

Jakli, A. ^{[1
,2
]}

机构：

[1] Kent State Univ, Inst Liquid Crystal, Kent, OH 44242 USA

[2] Kent State Univ, Chem Phys Interdisciplinary Program, Kent, OH 44242 USA

[3] Kent State Univ, Dept Phys, Kent, OH 44242 USA

[4] Res Inst Solid State Phys & Opt, Budapest, Hungary

来源：

SOFT MATTER | 2009年 / 5卷 / 19期

关键词：

BANANA-SHAPED MOLECULES; ISOTROPIC-PHASE; MESOGENS; MESOPHASE; BEHAVIOR;

D O I：

10.1039/b907261f

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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.

引用

页码：3618 / 3622

页数：5

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