Biaxial nematic and smectic phases of parallel particles with different cross sections

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Show simple item record Martínez-Ratón, Yuri Varga, Szabolcs Velasco, Enrique 2010-02-23T11:24:04Z 2010-02-23T11:24:04Z 2008-09
dc.identifier.bibliographicCitation Physical Review E 78, 031705 (2008)
dc.identifier.issn 1539-3755
dc.description 12 pages, 11 figures.-- PACS nrs.: 61.30.Cz, 61.30.Hn, 61.20.Gy.-- ArXiv pre-print available at:
dc.description.abstract We have calculated the phase diagrams of one-component fluids made of five types of biaxial particles differing in their cross sections. The orientation of the principal particle axis is fixed in space, while the second axis is allowed to freely rotate. We have constructed a free-energy density functional based on fundamental-measure theory to study the relative stability of nematic and smectic phases with uniaxial, biaxial, and tetratic symmetries. Minimization of the density functional allows us to study the phase behavior of the biaxial particles as a function of the cross-section geometry. For low values of the aspect ratio of the particle cross section, we obtain smectic phases with tetratic symmetry, although metastable with respect to the crystal, as our Monte Carlo simulation study indicates. For large particle aspect ratios and in analogy with previous work [A. G. Vanakaras, M. A. Bates, and D. J. Photinos, Phys. Chem. Chem. Phys. 5, 3700 (2003)], we have found a four-phase point where four spinodals, corresponding to phase transitions between phases with different symmetries, meet together. The location of this point is quite sensitive to particle cross section, which suggests that optimizing the particle geometry could be a useful criterion in the design of colloidal particles that can exhibit an increased stability of the biaxial nematic phase with respect to other competing phases with spatial order.
dc.description.sponsorship Y.M.-R. gratefully acknowledges financial support from Ministerio de Educación y Ciencia (Spain) under a Ramón y Cajal research contract and the MOSAICO grant. This work is part of the research Projects Nos. FIS2005-05243-C02-01 and FIS2007-65869-C03-01, also from Ministerio de Educación y Ciencia, and Grant No. S-0505/ESP-0299 from Comunidad Autónoma de Madrid (Spain). Support from the Spanish-Hungarian "Integrated Actions" programme under Grant Nos. HH-2006-0005 is also acknowledged.
dc.format.mimetype application/pdf
dc.language.iso eng
dc.publisher The American Physical Society
dc.rights © The American Physical Society
dc.subject.other [PACS] Molecular and microscopic models and theories of liquid crystal structure
dc.subject.other [PACS] Surface phenomena: alignment, anchoring, anchoring transitions, surface-induced layering, surface-induced ordering, wetting, prewetting transitions, and wetting transitions
dc.subject.other [PACS] Theory and models of liquid structure
dc.title Biaxial nematic and smectic phases of parallel particles with different cross sections
dc.type article PeerReviewed
dc.description.status Publicado
dc.subject.eciencia Matemáticas
dc.identifier.doi 10.1103/PhysRevE.78.031705
dc.rights.accessRights openAccess
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