Abstract
Current studies of thermotropic liquid crystals reveal a remarkable variety of smectic phases, distinguished by their molecular packing, symmetry of one and two-dimensional lattices and tilting. We review here the structure and phase behaviour of particular types of layering with emphasis on their relationship to asymmetry of the molecular structure and conformational mobility of different molecular moieties. The breaking of up-down symmetry in the orientation of the heads (tails) of molecules is considered as having either a steric or polar origin, or as induced by the polyphilic nature of molecules. The structure of tilted smectic phases and phases with alternating layer to layer tilt are discussed in detail. We consider also the possibility of transitions from the phases with one-dimensional periodicity (smectics) to columnar phases with two-dimensional positional order. The relevance of various types of molecular model that predict the regions of stability of different layered phases are discussed.
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Ostrovskii, B.I. (1999). Packing and Molecular Conformation, and Their Relationship with LC Phase Behaviour. In: Mingos, D.M.P. (eds) Liquid Crystals I. Structure and Bonding, vol 94. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-68305-4_5
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