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X-Ray Studies of Nematic Systems

X-ray studies of nematic systems are the orientational order parameto. ... [Pg.132]

The chemical shifts allowed the local order parameters to be computed which indicated the uniaxial to biaxial nematic phase transition. The nematic phase of a deuterated fiuorenone nematogen has been studied by NMR and X-ray and evidence for biaxial order close to its glass transition temperature has been inferred. The possible symmetries of the biaxial nematic phase have been examined based on experimental results and it is concluded that a monoclinic symmetry rather than an orthorhombic symmetry that is more likely to be the cause for the observed phase biaxiality in thermotropic bent-core and calamitic-tetrapode nematic systems. Density functional theory has been employed in a detailed conformational study of a bent-core mesogen The chemical shielding... [Pg.569]

A new and effective method for studying biaxial nematics with X-rays has been described recently [33b] with the classic inorganic (aqueous) lyotropic liquid crystal, vanadium pentoxide [33c], exhibiting now a biaxial nematic gel phase. Undoubtedly, biaxial nematogens would indeed be of great importance for the system of phase types, the theory of liquid crystals, and the understanding of... [Pg.52]

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