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Effect of particle geometry on phase transitions in two-dimensional liquid crystals

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dc.affiliation.dptoUC3M. Departamento de Matemáticases
dc.affiliation.grupoinvUC3M. Grupo de Investigación: Interdisciplinar de Sistemas Complejos (GISC)es
dc.contributor.authorMartínez-Ratón, Yuri
dc.contributor.authorVelasco, Enrique
dc.contributor.authorMederos, Luis
dc.date.accessioned2010-02-25T09:53:05Z
dc.date.available2010-02-25T09:53:05Z
dc.date.issued2005-02-08
dc.description8 pages, 7 figures.-- PACS nrs.: 64.70.Md, 64.60.My.-- ArXiv pre-print available at: http://arxiv.org/abs/cond-mat/0411584
dc.description.abstractUsing a version of density-functional theory which combines Onsager approximation and fundamental-measure theory for spatially nonuniform phases, we have studied the phase diagram of freely rotating hard rectangles and hard discorectangles. We find profound differences in the phase behavior of these models, which can be attributed to their different packing properties. Interestingly, bimodal orientational distribution functions are found in the nematic phase of hard rectangles, which cause a certain degree of biaxial order, albeit metastable with respect to spatially ordered phases. This feature is absent in discorectangles, which always show unimodal behavior. This result may be relevant in the light of recent experimental results which have confirmed the existence of biaxial phases. We expect that some perturbation of the particle shapes (either a certain degree of polydispersity or even bimodal dispersity in the aspect ratios) may actually destabilize spatially ordered phases thereby stabilizing the biaxial phase.
dc.description.sponsorshipY.M.-R. was supported by a Ramón y Cajal research contract. This work is part of research Projects Nos. BFM2003-0180, BFM2001-0224-C02-01, BFM2001-0224-C02-02, and BFM2001-1679-C03-02 (DGI) of the Ministerio de Educación y Ciencia (Spain).
dc.description.statusPublicado
dc.format.mimetypeapplication/pdf
dc.identifier.bibliographicCitationJournal of Chemical Physics, 2005, vol. 122, n. 6, p. 064903-064903-8
dc.identifier.doi10.1063/1.1849159
dc.identifier.issn0021-9606 (Print)
dc.identifier.issn1089-7690 (Online)
dc.identifier.urihttps://hdl.handle.net/10016/7019
dc.language.isoeng
dc.publisherAmerican Institute of Physics
dc.relation.publisherversionhttp://dx.doi.org/10.1063/1.1849159
dc.rights© American Institute of Physics
dc.rights.accessRightsopen access
dc.subject.ecienciaMatemáticas
dc.subject.otherDensity functional theory
dc.subject.otherPhase diagrams
dc.subject.otherLiquid crystal phase transformations
dc.subject.otherNematic liquid crystals
dc.subject.otherMolecular orientation
dc.titleEffect of particle geometry on phase transitions in two-dimensional liquid crystals
dc.typeresearch article*
dc.type.reviewPeerReviewed
dspace.entity.typePublication
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