Short-range smectic order in bent-core nematic liquid crystals

S. H. Hong; R. Verduzco; J. C. Williams; R. J. Twieg; E. DiMasi; R. Pindak; A. Jákli; J. T. Gleeson; S. Sprunt

doi:10.1039/C000362J

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Soft Matter

Issue 19, 2010

Where physics meets chemistry meets biology for fundamental soft matter research.

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Short-range smectic order in bent-core nematic liquid crystals

S. H. Hong,^a R. Verduzco,^b J. C. Williams,^c R. J. Twieg,^c E. DiMasi,^d R. Pindak,^d A. Jákli,^e J. T. Gleeson^a and S. Sprunt^a

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Department of Physics, Kent State University, Kent, USA

Department of Chemical and Biomolecular Engineering, Rice University, Houston, USA

Department of Chemistry, Kent State University, Kent, USA

National Synchrotron Light Source, Brookhaven National Laboratory, Upton, USA

Chemical Physics Interdisciplinary Program and Liquid Crystal Institute, Kent State University, Kent, USA

Soft Matter, 2010,6, 4819-4827

DOI: 10.1039/C000362J
Received 08 Jan 2010, Accepted 03 Jun 2010
First published online 13 Aug 2010

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Abstract
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Small angle X-ray diffraction from the uniaxial nematic phase of certain bent-core liquid crystals is shown to be consistent with the presence of molecular clusters possessing short-range tilted smectic (smectic-C) order. Persistence of these clusters throughout the nematic phase, and even into the isotropic state, likely accounts for the unusual macroscopic behavior previously reported in bent-core nematics, including an anomalously large flexoelectric effect ( [similar] 1000 times that of conventional calamitic nematics), very large orientational and flow viscosities ( 10–100 and 100–1000 times, respectively, typical values for calamitics), and an extraordinary flow birefringence observed in the isotropic state.

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S. H. Hong
R. Verduzco
J. C. Williams
R. J. Twieg
E. DiMasi
R. Pindak
A. Jákli
J. T. Gleeson
S. Sprunt

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