Ferroelectric liquid crystals from achiral molecules
Article Abstract:
A group of achiral polyphilic molecules has the properties of ferroelectric liquid crystals. Tests of the polyphilic compounds found that they possessed two characteristics that define ferroelectricity: the piezoelectric response and the repolarization current. The production of the polar phase in these compounds should permit the creation of a phase in which the bulk polarization parallels the long axis of the molecular constituents. This research may point the way to the technological application of ferroelectric liquid crystals.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1992
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Two-dimensional ferroelectric films
Article Abstract:
Ultrathin crystalline films allow the exploration of phase transitions between two and three dimensions. Second-order ferromagnetic phase transitions have been see in monolayer magnetic films. The ferroelectric transition in crystalline films of a random copolymer of vinylidene fluoride and trifluorethylene was measured. First-order ferroelectric phase transition was observed, with a transition temperature almost equal to the bulk value.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1998
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Photochemical switching of polarization in ferroelectric liquid-crystal films
Article Abstract:
A photochemical process can be used to change the polarization of liquid crystal films which are ferroelectric. The process uses doping with a substance that can be irradiated to cause trans-cis isomerization. The switching potential of the film is changed wherever radiation hits. This process should be developed for use in devices since it is reliable, quick, reversible and stable.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1993
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