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Issue 3, 2011
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Cybotaxis dominates the nematic phase of bent-core mesogens: a small-angle diffuse X-ray diffraction study

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Abstract

New temperature dependent X-ray diffraction (XRD) data on the bent-core mesogens based on the nonlinear 2,5-bis(p-hydroxyphenyl)-1,3,4-oxadiazole (ODBP) unit enable a consistent interpretation of the supramolecular structure in this class of liquid crystals. Strong evidence for cybotaxis in the high temperature phase explains the small-angle four-spot pattern and calls into question prior XRD interpretations. We find that the data can be satisfactorily explained by skewed cybotaxis, a stratified arrangement of tilted, bent-core mesogens (BCMs). We also observe the temperature-induced evolution of skewed cybotaxis to normal cybotaxis—strata wherein the long axes of the BCMs are normal to the layer fluctuations. Our XRD interpretation is compatible with the NMR data that exhibit biaxiality in the nematic phase of ODBP mesogens.

Graphical abstract: Cybotaxis dominates the nematic phase of bent-core mesogens: a small-angle diffuse X-ray diffraction study

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Article information


Submitted
29 Jul 2010
Accepted
05 Oct 2010
First published
28 Oct 2010

Soft Matter, 2011,7, 895-901
Article type
Paper

Cybotaxis dominates the nematic phase of bent-core mesogens: a small-angle diffuse X-ray diffraction study

O. Francescangeli, F. Vita, C. Ferrero, T. Dingemans and E. T. Samulski, Soft Matter, 2011, 7, 895
DOI: 10.1039/C0SM00745E

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