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Structure of Ions in Liquid-Crystalline Materials

Published online by Cambridge University Press:  10 February 2011

Shohei Naemura ,
Yuji Nakazono ,
Kenichi Nishikawa ,
Atsushi Sawada ,
Peer Kirsch ,
Matthias Bremer  and
Kazuaki Tarumi
Shohei Naemura
Affiliation:
Atsugi Technical Center, Merck Japan Ltd., Aiko-gun, Kanagawa 243-0303, Japan
Yuji Nakazono
Affiliation:
Atsugi Technical Center, Merck Japan Ltd., Aiko-gun, Kanagawa 243-0303, Japan
Kenichi Nishikawa
Affiliation:
Atsugi Technical Center, Merck Japan Ltd., Aiko-gun, Kanagawa 243-0303, Japan
Atsushi Sawada
Affiliation:
Atsugi Technical Center, Merck Japan Ltd., Aiko-gun, Kanagawa 243-0303, Japan
Peer Kirsch
Affiliation:
Liquid Crystal Research, Business Unit LC, Merck KGaA, 64271 Darmstadt, Germany
Matthias Bremer
Affiliation:
Liquid Crystal Research, Business Unit LC, Merck KGaA, 64271 Darmstadt, Germany
Kazuaki Tarumi
Affiliation:
Liquid Crystal Research, Business Unit LC, Merck KGaA, 64271 Darmstadt, Germany
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Abstract

Both steady-state current and dielectric-loss measurements were performed on a liquid-crystalline material, 4-(trans-4-pentylcyclohexyl)benzonitryl, in an isotropic liquid phase, which provide information on generation and behavior of ions, dominating DC and AC conductivity, respectively. The frequency dependence measurements of dielectric-loss can successfully estimate such characteristics of ions as total quantity of electricity, diffusion constant (mobility), and the size. With help of chemical analysis like ion chromatography and semi-empirical quantum chemical computation, the majority of ions, especially dominating AC conductivity, were estimated to be inorganic cations with Stokes' radius of around 2 × 10−8(cm), either naked or hydrated, and solvated ions with Stokes' radius of around 5 × 10−8(cm), most probably with the liquid-crystalline molecules at the solvation number of 1.2 in average. The present microscopic investigation of conduction mechanism is of great help for development of liquid-crystalline materials, especially for use in sophisticated displays with excellent picture quality.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 508: Symposium B – Flat Panel Display Materials - 1998 , January 1998 , 235
Copyright
Copyright © Materials Research Society 1998

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References

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