Biaxial nematic mesophases from shape-persistent mesogens with a fluorenone bending unit.
Biaxial nematic mesophases from shape-persistent mesogens with a fluorenone bending unit.
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DOI：
10.1002/chem.201001214
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发表时间：
2010-07
期刊：
影响因子：
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通讯作者：
M. Lehmann;C. Köhn;J. Figueirinhas;G. Feio;Carlos Cruz;R. Y. Dong
中科院分区：
文献类型：
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作者：
M. Lehmann;C. Köhn;J. Figueirinhas;G. Feio;Carlos Cruz;R. Y. Dong
Nematic phases, applied in almost all commercial liquidcrystal (LC) displays, are LC phases with mesogens isotropically distributed and exhibiting orientational long-range order of one preferred molecular axis along a common direction defined by the so-called director. These are the phases with the lowest viscosity and besides the anisotropic properties, are most similar to isotropic liquids. Biaxial nematics should realise a long-range orientational order of all three molecular axes along three mutually perpendicular directors, but maintain the isotropic distribution of the molecular centres of gravity and their molecular mobility. Such phases are not only appealing from the viewpoint of basic research and theoretical modelling, but are also of technological interest to speed up the switching of LC displays. [1, 2, 3] After the prediction by Freiser, [4] Saupe and Yu were the first to discover such mesophases in a narrow region of the phase diagram of a lyotropic LC. [5] The much-pursued syn
