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Absolute determination of the orientational order quality in a columnar discotic liquid crystal

Published online by Cambridge University Press:  11 November 2011

M. Ndao ,
R. Lefort ,
P. Huber ,
J.-M. Zanotti ,
B. Frick ,
A. Schoenhals  and
D. Morineau
M. Ndao
Affiliation:
IPR, UMR CNRS 6251, Université de Rennes 1, France
R. Lefort*
Affiliation:
IPR, UMR CNRS 6251, Université de Rennes 1, France
P. Huber
Affiliation:
Experimental Physics, Saarland University, D-66041 Saarbücken, Germany
J.-M. Zanotti
Affiliation:
LLB, CEA Saclay, France
B. Frick
Affiliation:
Institut Laue Langevin, 6 rue Jules Horowitz, 38000 GRENOBLE, France
A. Schoenhals
Affiliation:
BAM Federal Institute for Materials Research and Testing; Unter den Eichen 87, 12205 Berlin, Germany
D. Morineau
Affiliation:
IPR, UMR CNRS 6251, Université de Rennes 1, France
*
*Email: ronan.lefort@univ-rennes1.fr
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Abstract

Simple NMR techniques can provide an absolute quantification of the quality of the orientational order of discotic columnar phases, provided the anisotropic local magnetic interactions are thoroughly characterized. For the prototypical discotic liquid crystal hexapentoxy-triphenylene, we measure the 13C chemical shift anisotropy of the triphenylene carbons, and use this result to analyze the orientational order, that occurs through a first order phase transition from the high temperature liquid phase, and is almost saturated (order parameter close to 0.85).

Keywords

liquid crystalnuclear magnetic resonance (NMR)phase transformation
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1349: Symposium DD – Quantitative Characterization of Nanostructured Materials , 2011 , mrss11-1349-dd02-05
Copyright
Copyright © Materials Research Society 2011

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References

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