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- W2079793910 abstract "The spin-gas model of liquid crystals is employed to describe and explain single, double and quadruple reentrances of nematic and smectic phases, as well as reentrances below the monolayer smectic A 1 phase, all of which are observed experimentally. New sextuple (and octuple) reentrances are predicted in the sequence nematic-smectic A d -nematic-smectic A 1 -nematic-smectic A d (-nematic-smectic A 1 ), as temperature is lowered. The multiple reentrances are very sensitive to molecular structure, in particular to the molecular tail length. The microscopic information available from the statistics of microscopic configurations is scrutinized. Statistical weights of classes of positional configurations are monitored. Two distinct mechanisms of nematic reentrance feature: microscopic frustation of dipoles and competing local antiferroelectric and ferroelectric orders. Frustration is relieved by atomic and librational permeations, causing distinct smectic reentrances. The continuum limit of librational permeation is taken. The subtle role played by molecular dimers is outlined and the concept of a dipolar-pair lenght is critically examined Emploi du modele de gaz de spins des cristaux liquides pour decrire et expliquer les reentrees simples, doubles et quadruples de phases nematiques (N) et smectiques (Sm) ainsi que les reentrees sous la phase monocouche smectique A 1 , qui sont toutes observees experimentalement. Prevision de nouvelles reentrees sextuples et octuples le long de la sequence N-SmAd-N-SmAd-N-SmA 1 -N-SmAd (-N-SmA 1 )" @default.
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- W2079793910 date "1988-01-01" @default.
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- W2079793910 title "Molecular structure and reentrant phases in polar liquid crystals" @default.
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- W2079793910 doi "https://doi.org/10.1051/jphys:01988004902035300" @default.
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