Hostname: page-component-586b7cd67f-l7hp2 Total loading time: 0 Render date: 2024-11-29T10:50:37.191Z Has data issue: false hasContentIssue false
  • English
  • Français

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
Get access

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

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

1. Naemura, S., Mat. Res. Soc. Symp. Proc. 424, p.295 (1997).Google Scholar
2. Naemura, S., Nakazono, Y., Ichinose, H., Sawada, A., Boehm, E., Bremer, M., and Tarumi, K., SID'97 Digest Tech. Papers XXVIII, p. 199 (1997).Google Scholar
3. Nakazono, Y., Ichinose, H., Sawada, A., Naemura, S., Bremer, M., and Tarumi, K., Conf. Record Int'l. Display Res. Conf. '97, p.65 (1997).Google Scholar
4. Heilmeier, G.H. and Heyman, P. M., Phys. Rev. Lett. 18, p.583 (1967).Google Scholar
5. Murakami, S. and Naito, H., Jpn. J. Appl. Phys. 36, p.773 (1997).Google Scholar
6. Yanagisawa, T., Matsumoto, H., and Yahagi, K., Jap. J. Appl. Phys. 16, p.45 (1977).Google Scholar
7. Sawada, A., Nakazono, Y., Tarumi, K., and Naemura, S., to appear in Mol. Cryst. Liq. Cryst. (1998).Google Scholar
8. Verweire, B. and Colpaert, C., Conf. Record Int'l. Display Res. Conf. '97, p.9 (1997).Google Scholar
9. Eidenschink, R., Erdmann, D., Krause, J., and Pohl, L., Angew. Chem. 89, p.103 (1977).Google Scholar
10. Bremer, M., Naemura, S., and Tarumi, K., Jpn. J. Appl. Phys. 37, p.L88 (1998).Google Scholar