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Order Parameters, Orientational Distribution Functions and Heliconical Tilt Angles of Oligomeric Liquid Crystals

preprint
submitted on 06.02.2019 and posted on 06.02.2019 by Richard Mandle, John W. Goodby
We compare the order parameters, orientational distribution functions (ODF) and heliconical tilt angles of the TB phase exhibited by a liquid-crystalline dimer (CB7CB) to a tetramer (O47) and hexamer (O67) by SAXS/WAXS. Following the N-TB phase transition we find that all order parameters decrease, and while 〈P2 〉 remains positive 〈P4 〉 becomes negative. For all three materials the order parameter 〈P6 〉 is near zero in both phases. The ODF is sugarloaf-like in the nematic phase and volcano-like in the TB phase, allowing us to estimate the heliconical tilt angle of each material and its thermal evolution. The heliconical tilt angle appears to be largely independent of the material studied despite the differing number of mesogenic units.

Funding

EPSRC EP/K039660/1

History

Email Address of Submitting Author

richard.mandle@york.ac.uk

Institution

University of York

Country

UK

ORCID For Submitting Author

0000-0001-9816-9661

Declaration of Conflict of Interest

no conflict of interest

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