Determination of the translational order parameter for smectic liquid crystals 
using small-angle neutron scattering

Alexander, G. G.; King, S. M.; Richardson, R. M.; Zimmermann, Herbert

doi:10.1080/02678292.2010.481902

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Determination of the translational order parameter for smectic liquid crystals using small-angle neutron scattering

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Zimmermann, Herbert
Department of Biomolecular Mechanisms, Max Planck Institute for Medical Research, Max Planck Society;

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Citation

Alexander, G. G., King, S. M., Richardson, R. M., & Zimmermann, H. (2010). Determination of the translational order parameter for smectic liquid crystals using small-angle neutron scattering. Liquid Crystals, 37(6-7), 961-968. doi:10.1080/02678292.2010.481902.

Cite as: https://hdl.handle.net/11858/00-001M-0000-002C-5107-F

Abstract

A simple method to determine the translational order parameter of a smectic liquid crystal is presented. It is based on a measurement of the absolute intensity of the first-order layer reflection from an unaligned (powder) sample using small-angle neutron scattering. The Lorentz factor and molecular form factor are used to derive the order parameter from the intensity. The method is demonstrated for 4-octyl-4'-cyanobiphenyl (8CB), using two different isotopomers which give a consistent translational order parameter value of 0.5 in the smectic A phase.