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Liquid Crystals Volume 37, 2010 - Issue 6-7: Commemorative Issue dedicated to Alfred Saupe
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Invited Articles

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

G.G. Alexander H. H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol, BS8 1TL, UK
,
S.M. King Science and Technology Facilities Council, Rutherford Appleton Laboratory, Didcot, Oxon, OX11 OQX, UK
,
R.M. Richardson H. H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol, BS8 1TL, UKCorrespondence[email protected]
&
H. Zimmermann Max-Planck Institute for Medical Research, Jahnstrasse, 29, 69120, Heidelberg, Germany
Pages 961-968 | Received 22 Jan 2010, Accepted 17 Mar 2010, Published online: 06 Jul 2010
 
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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.

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