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• W2078463822 abstract "Thermotropic biaxial nematic phases seem to be rare, but biaxial smectic A phases less so. Here we use molecular field theory to study a simple two-parameter model, with one parameter promoting a biaxial phase and the second promoting smecticity. The theory combines the biaxial Maier-Saupe and McMillan models. We use alternatively the Sonnet-Virga-Durand (SVD) and geometric mean approximations (GMA) to characterize molecular biaxiality by a single parameter. For non-zero smecticity and biaxiality, the model always predicts a ground state biaxial smectic A phase. For a low degree of smectic order, the phase diagram is very rich, predicting uniaxial and biaxial nematic and smectic phases, with the addition of a variety of tricritical and tetracritical points. For higher degrees of smecticity, the region of stability of the biaxial nematic phase is restricted and eventually disappears, yielding to the biaxial smectic phase. Phase diagrams from the two alternative approximations for molecular biaxiality are similar, except inasmuch that SVD allows for a first-order isotropic-biaxial nematic transition, whereas GMA predicts a Landau point separating isotropic and biaxial nematic phases. We speculate that the rarity of thermotropic biaxial nematic phases is partly a consequence of the presence of stabler analogous smectic phases." @default.
• W2078463822 created "2016-06-24" @default.
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• W2078463822 date "2013-10-01" @default.
• W2078463822 modified "2023-09-24" @default.
• W2078463822 title "Molecular field theory for biaxial smectic A liquid crystals" @default.
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• W2078463822 doi "https://doi.org/10.1063/1.4820555" @default.
• W2078463822 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/24116580" @default.
• W2078463822 hasPublicationYear "2013" @default.
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