Smectic-A Order at the Surface of a Nematic Liquid Crystal: Synchrotron X-Ray Diffraction

Jens Aage Als-Nielsen, Finn Erland Christensen, P. S. Pershan

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

A novel geometry in which it is possible to do x-ray diffraction from a horizontal surface of fluids is applied to liquid crystals. A large-diameter drop of octyloxycyanobiphenyl (8OCB) on a glass plate treated for homeotropic alignment yields perfect alignment of the smectic-A layers at the top surface over an area of several square millimeters. The surface in the bulk nematic as well as in the isotropic phase was found to consist of smectic-A layers with a penetration depth equal to the longitudinal smectic-A correlation length ξ∥∼(T-TNA)-ν∥ determined previously.
Original languageEnglish
JournalPhysical Review Letters
Volume48
Issue number16
Pages (from-to)1107-1110
ISSN0031-9007
DOIs
Publication statusPublished - 1982

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