Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.21/5970
Título: Phase behavior of shape-changing spheroids
Autor: Teixeira, Paulo Ivo Cortez
Masters, Andrew J.
Palavras-chave: Rod-plate mixtures
Rodlike
Potentials
Model
Data: 4-Dez-2015
Editora: Amer Physical SOC
Citação: TEIXEIRA, Paulo Ivo Cortez; MASTERS, Andrew J.; Phase behavior of shape-changing spheroids. Physical Review E. ISSN 1539-3755. Vol. 92 (6), 2015
Relatório da Série N.º: ;062506
Resumo: We introduce a simple model for a biaxial nematic liquid crystal. This consists of hard spheroids that can switch shape between prolate (rodlike) and oblate (platelike) subject to an energy penalty Δε. The spheroids are approximated as hard Gaussian overlap particles and are treated at the level of Onsager's second-virial description. We use both bifurcation analysis and a numerical minimization of the free energy to show that, for additive particle shapes, (i) there is no stable biaxial phase even for Δε=0 (although there is a metastable biaxial phase in the same density range as the stable uniaxial phase) and (ii) the isotropic-to-nematic transition is into either one of two degenerate uniaxial phases, rod rich or plate rich. We confirm that even a small amount of shape nonadditivity may stabilize the biaxial nematic phase.
Peer review: yes
URI: http://hdl.handle.net/10400.21/5970
DOI: 10.1103/PhysRevE.92.062506
ISSN: 1539-3755
1550-2376
Versão do Editor: http://journals.aps.org/pre/abstract/10.1103/PhysRevE.92.062506
Aparece nas colecções:ISEL - Física - Artigos

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