Sign inversion of the spontaneous polarization in a "de Vries"-type ferroelectric liquid crystal.
Sign inversion of the spontaneous polarization in a "de Vries"-type ferroelectric liquid crystal.
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“de Vries”型铁电液晶中自发极化的符号反转。
DOI:
10.1002/cphc.201301154
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发表时间:
2014
期刊:
影响因子:
--
通讯作者:
Nonnenmacher D
中科院分区:
文献类型:
--
作者:
Nonnenmacher D
In contrast to common ferroelectric smectic C* liquid crystals, the siloxane‐terminated smectic mesogenE6is characterized by an unusual temperature variation of the spontaneous polarization. The polarization starts to grow from nearly zero despite the first‐order SmA*‐SmC* transition, and increases faster than linearly over a large temperature interval while the tilt angle rapidly saturates. To study this behavior in more detail, binary mixtures of different concentrations ofE6in the achiral SmC materialC8Cl, which has a similar chemical structure, were investigated. Surprisingly, all mixtures show a temperature dependent polarization sign inversion, which shifts towards the SmC*‐SmA* transition with increasingE6concentration. For the pureE6the inversion temperature meets the SmA*‐SmC* phase transition temperature. In a second binary mixture withE6and a conventional materialC9–2PhPwe found out, that the dependence of the inversion temperature on the concentration ofE6changes qualitatively when the nanosegregation is partially destroyed. A molecular theory of the polarization sign inversion in smectics C* with strong polar intermolecular interactions is developed which enables one to explain the concentration dependence of the inversion temperature in both mixtures.
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DOI:
10.1103/physreve.77.031701
发表时间:
2007
期刊:
Physical review. E, Statistical, nonlinear, and soft matter physics
影响因子:
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作者:
M. Osipov;M. Gorkunov
通讯作者:
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DOI:
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1996
期刊:
Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics
影响因子:
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作者:
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1987
期刊:
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DOI:
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发表时间:
2008
期刊:
影响因子:
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作者:
M. Gorkunov;M. Osipov
通讯作者:
M. Osipov
DOI:
10.1103/physreve.71.041705
发表时间:
2005
期刊:
Physical review. E, Statistical, nonlinear, and soft matter physics
影响因子:
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作者:
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通讯作者:
S. Kondoh