Journal ArticleDOI
Molecular Orientational Structures in Ferroelectric, Ferrielectric and Antiferroelectric Smectic Liquid Crystal Phases as Studied by Conoscope Observation
TLDR
In this paper, the conoscopic figure in the antiferroelectric smectic CA* phase does not shift its center and is biaxial with its optic plane perpendicular to the field direction.Abstract:
Molecular orientational structures in MHPOBC were studied by means of conoscope observation. Contrary to a ferroelectric response of the conoscope to an electric field in the smectic C* phase, the conoscopic figure in the antiferroelectric smectic CA* phase does not shift its center and is biaxial with its optic plane perpendicular to the field direction. This conoscope change is only due to a dielectric contribution, indicating the existence of the inherent threshold in the electric field induced transition to the ferroelectric phase. In between the ferroelectric and antiferroelectric phases, a kind of ferrielectric phase was clearly distinguished in the field response of the conoscopic figure; the shift of the conoscope center perpendicular to the applied field and the biaxial optic plane parallel to the field suggest a novel molecular orientational structure.read more
Citations
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Journal ArticleDOI
Antiferroelectric chiral smectic liquid crystals
TL;DR: In this paper, the authors have suggested the pair formation of transverse dipole moments in adjacent smectic layers as the cause of antiferroelectricity in liquid crystals.
Journal ArticleDOI
Chirality in liquid crystals
TL;DR: In this article, the various effects of chirality in liquid-crystalline systems are described in general terms, including the formation of helical ordering of the constituent molecules of the phase.
Journal ArticleDOI
Phase transitions in liquid crystals
TL;DR: A comprehensive overview of phase transition studies can be found in this article, where the authors identify the essential key concepts and points of difficulty associated with the study of phase transitions and discuss the most widely used experimental techniques for measuring these transition properties.
Journal ArticleDOI
Stability of Antiferroelectricity and Causes for its Appearance in SmCα* and SmCA* Phases of a Chiral Smectic Liquid Crystal, MHPOBC
Yoichi Takanishi,Kazuyuki Hiraoka,Vijay K. Agrawal,Hideo Takezoe,Atsuo Fukuda,Mitsugu Matsushita +5 more
TL;DR: In this article, two types of molecular interactions are proposed: the interaction between the spontaneous polarizations in the neighboring layers which is effective in SmCα*, and the pairing of transverse dipole moments responsible for the antiferroelectricity in SmCA*.
References
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Book
Principles of Optics
TL;DR: In this paper, the authors discuss various topics about optics, such as geometrical theories, image forming instruments, and optics of metals and crystals, including interference, interferometers, and diffraction.
Principles of Optics
TL;DR: In this article, the authors discuss various topics about optics, such as geometrical theories, image forming instruments, and optics of metals and crystals, including interference, interferometers, and diffraction.
Journal ArticleDOI
Antiferroelectric Chiral Smectic Phases Responsible for the Trislable Switching in MHPOBC
TL;DR: The antiferroelectric structure was strongly supported by selective reflections in oblique incidence; a full-pitch band does not appear in the antiferrous liquid crystalline phases, while it does appears in the ferroelectric phase as discussed by the authors.
Journal ArticleDOI
Tristable Switching in Surface Stabilized Ferroelectric Liquid Crystals with a Large Spontaneous Polarization
TL;DR: In this paper, a new switching process was observed in surface stabilized ferroelectric liquid crystals, associated with a third stable state in addition to the well-known bistable states.
Journal ArticleDOI
Novel Phases Exhibiting Tristable Switching
A. D. L. Chandani,Yukio Ouchi,Hideo Takezoe,Atsuo Fukuda,Kanetsugu Terashima,Kenji Furukawa,Akira Kishi +6 more
TL;DR: In this article, the phase transition from Sm C* to Sm CA* is not observable by AC calorimetry but small peaks comparable to the Sm A-Sm C* transition are discernible in DSC.