English
 
User Manual Privacy Policy Disclaimer Contact us
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
  Director dynamics in a monodomain thin smectic liquid crystal film

Ogaki, H., Okumoto, K., Sugimura, A., & Zimmermann, H. (2006). Director dynamics in a monodomain thin smectic liquid crystal film. Thin Solid Films, 499(1), 249-255. doi:10.1016/j.tsf.2005.07.042.

Item is

Basic

show hide
Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002A-EB19-2 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002A-EB1A-F
Genre: Journal Article
Alternative Title : Director dynamics in a monodomain thin smectic liquid crystal film

Files

show Files
hide Files
:
ThinSolidFilms_499_2006_249.pdf (Any fulltext), 260KB
 
File Permalink:
-
Name:
ThinSolidFilms_499_2006_249.pdf
Description:
-
Visibility:
Restricted (Max Planck Institute for Medical Research, Heidelberg; )
MIME-Type / Checksum:
application/pdf
Technical Metadata:
Copyright Date:
-
Copyright Info:
-
License:
-

Creators

show
hide
 Creators:
Ogaki, H., Author
Okumoto, Kanako, Author
Sugimura, Akihiko, Author
Zimmermann, Herbert1, Author              
Affiliations:
1Emeritus Group Biophysics, Max Planck Institute for Medical Research, Max Planck Society, ou_1497712              

Content

show
hide
Free keywords: Smectic liquid crystal; 8CB; Deuterium NMR; Nematic liquid crystal; Director dynamics; Rotational viscosity
 Abstract: Deuterium NMR spectroscopy has been used to investigate the director dynamics in the smectic A phase of perdeuteriated 4-octyl-4′-cyanobiphenyl-d25 (8CB-d25), where the director was aligned by an electric field. The electric field direction made an angle of 44.7° with the magnetic field in order to provide a unique alignment pathway; accordingly the director is expected to rotate as a monodomain. When the electric field is applied to the nematic film, the director moves from being parallel to the magnetic field to being at an angle with respect to it. After the electric field is switched off, the director relaxes back to being parallel to the magnetic field. Deuterium NMR spectra were recorded during the turn-on and the turn-off alignment processes as a function of time. This particular technique was chosen because the spectral peaks associated with each rigid group in the molecule are clearly resolved and of comparable intensity. For all of the experiments at different temperatures in the smectic A phase of 8CB-d25 we found that the relaxation times are independent of the group used to determine the director orientation during the alignment process as same as the results for the nematic phase. It also was found that the relaxation time in the smectic A phase is about 1,000,000 times as large as that in the nematic phase. This results in a strong pretransitional growth of the relaxation time as the transition to the smectic A phase is approached.

Details

show
hide
Language(s): eng - English
 Dates: 20052005-12-192005-12-192006-03-21
 Publication Status: Published in print
 Pages: 7
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Degree: -

Event

show

Legal Case

show

Project information

show

Source 1

show
hide
Title: Thin Solid Films
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: Lausanne, Switzerland, etc. : Elsevier
Pages: - Volume / Issue: 499 (1) Sequence Number: - Start / End Page: 249 - 255 Identifier: ISSN: 0040-6090
CoNE: /journals/resource/954925449792