Volume 104, 1996

Smectic-A ordering in liquid crystal films

Abstract

We modify an earlier density-functional theory of inhomogeneous liquid crystals so that it is now able to account for enhanced smectic-A ordering at a free surface. The main modification is the use of different spatial ranges for different angular components of the intermolecular pair potential. We show that the modified theory is able to generate both partial and complete wetting by the smectic-A phase, as well as discrete layering transitions at an interface between isotropic liquid and vapour phases. The major application of the theory is to investigate the properties and conditions required for the existence of ‘layer-thinning’ transitions in freely suspended smectic-A films. Despite the existence of surface-enhanced smectic ordering, we find that layer-thinning transitions do not occur in most parameter ranges of the theory, and instead that freely suspended films will generally tend to rupture on heating. Thinning transitions analogous to those observed experimentally are found to occur within very limited parameter ranges, and are associated with melting of the film interior to a nematic rather than isotropic liquid phase.

Article information

Article type
Paper

Faraday Discuss., 1996,104, 111-126

Smectic-A ordering in liquid crystal films

Y. Martínez-Ratón, A. M. Somoza, L. Mederos and D. E. Sullivan, Faraday Discuss., 1996, 104, 111 DOI: 10.1039/FD9960400111

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements