Dynamic Processes of Ferroelectric Liquid Crystal Molecules under an Applied Electric Field

The dynamic changes in the molecular alignment of ferroelectric liquid crystal under an applied electric field are studied by observation of conoscopic figures with a temporal resolution of 0.1 ms. Comparison of the observed conoscopic figures with simulations indicate that deformation of the helica...

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Bibliographic Details
Published in:Ferroelectrics 2008-05, Vol.365 (1), p.20-26
Main Authors: Takei, Misaki, Yamashita, Masafumi
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Condensed matter: structure, mechanical and thermal properties
conoscopic figure
Dielectric, piezoelectric, ferroelectric and antiferroelectric materials
Dielectrics, piezoelectrics, and ferroelectrics and their properties
dynamic orientation process
Exact sciences and technology
Ferroelectric liquid crystal
helical structure
Liquid crystals
Liquids and liquid crystals
Physics
Structure of solids and liquids
crystallography
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Summary:The dynamic changes in the molecular alignment of ferroelectric liquid crystal under an applied electric field are studied by observation of conoscopic figures with a temporal resolution of 0.1 ms. Comparison of the observed conoscopic figures with simulations indicate that deformation of the helical structures in the ferroelectric smectic C* phase initiates from the center of the liquid crystal cell within 0.1 ms under an electric field, propagating outward to the cell edges over a period of a few milliseconds. The fastest moving velocity (Δ φ/Δ t) is found to occur at molecular layers with azimuthal angles of π /2 and 3π /2 rad.
ISSN:0015-0193
1563-5112
DOI:10.1080/00150190802060191