Show simple item record

dc.contributor.authorBall, John M.
dc.contributor.authorMajumdar, Apala
dc.date.accessioned2016-02-25T13:44:35Z
dc.date.available2016-02-25T13:44:35Z
dc.date.issued2010-07-20
dc.identifier.citationBall JM, Majumdar A (2010) Nematic Liquid Crystals: From Maier-Saupe to a Continuum Theory. Molecular Crystals and Liquid Crystals 525: 1–11. Available: http://dx.doi.org/10.1080/15421401003795555.
dc.identifier.issn1542-1406
dc.identifier.issn1563-5287
dc.identifier.doi10.1080/15421401003795555
dc.identifier.urihttp://hdl.handle.net/10754/598965
dc.description.abstractWe define a continuum energy functional that effectively interpolates between the mean-field Maier-Saupe energy and the continuum Landau-de Gennes energy functional and can describe both spatially homogeneous and inhomogeneous systems. In the mean-field approach the main macroscopic variable, the Q-tensor order parameter, is defined in terms of the second moment of a probability distribution function. This definition imposes certain constraints on the eigenvalues of the Q-tensor order parameter, which may be interpreted as physical constraints. We define a thermotropic bulk potential which blows up whenever the eigenvalues of the Q-tensor order parameter approach physically unrealistic values. As a consequence, the minimizers of this continuum energy functional have physically realistic order parameters in all temperature regimes. We study the asymptotics of this bulk potential and show that this model also predicts a first-order nematic-isotropic phase transition, whilst respecting the physical constraints. In contrast, in the Landau-de Gennes framework the Q-tensor order parameter is often defined independently of the probability distribution function, and the theory makes physically unrealistic predictions about the equilibrium order parameters in the low-temperature regime. Copyright © Taylor & Francis Group, LLC.
dc.description.sponsorshipA. Majumdar is supported by Award No. KUK-C1-013-04, made by King Abdullah University of Science and Technology (KAUST) to the Oxford Centre for Collaborative Applied Mathematics. J. M. Ball is supported by EPSRC grants EP/E010288/1 and EP/E035027/1. The authors gratefully acknowledge helpful discussions with Geoffrey Luckhurst, Peter Palffy-Muhoray, Valery Slastikov and Tim Sluckin.
dc.publisherInforma UK Limited
dc.subjectEigenvalue constraints
dc.subjectelastic constants
dc.subjectLandau-de Gennes
dc.subjectMaier-Saupe
dc.subjectnematic liquid crystals
dc.titleNematic Liquid Crystals: From Maier-Saupe to a Continuum Theory
dc.typeArticle
dc.identifier.journalMolecular Crystals and Liquid Crystals
kaust.grant.numberKUK-C1-013-04


This item appears in the following Collection(s)

Show simple item record