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  Molecular dynamics and alignment studies of silica-filled 4-pentyl-4'-cyanobiphenyl (5CB) liquid crystal

Ewiss, M. A. Z., Nabil, G., Stoll, B., & Herminghaus, S. (2003). Molecular dynamics and alignment studies of silica-filled 4-pentyl-4'-cyanobiphenyl (5CB) liquid crystal. Liquid Crystals, 30(10), 1241-1250. doi:10.1080/02678290310001602003.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0029-A9E1-2 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0029-A9E2-F
Genre: Journal Article

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 Creators:
Ewiss, M. A. Zaki1, Author
Nabil, G., Author
Stoll, B., Author
Herminghaus, Stephan2, Author              
Affiliations:
1External Organizations, ou_persistent22              
2Group Granular matter and irreversibility, Department of Dynamics of Complex Fluids, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society, ou_2063306              

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 Abstract: A comprehensive study of the dielectric properties of 4-pentyl-4′-cyanobiphenyl (5CB) liquid crystal filled with silica particles (particle size 30–80 nm, concentration 2, 3, 5, 10 and 15 wt%). Dielectric spectroscopy in the frequency range 100 to 10 7 Hz was applied to investigate the influence of the filler on the dynamic behaviour of the liquid crystal molecules in both the nematic and isotropic phases. In this frequency range one relaxation process is observed (at f>106 Hz). The dynamical behaviour of the 5CB liquid crystal is described by the Cole-Cole relaxation function. The temperature dependence of the relaxation time obeys the empirical Arrhenius equation. The activation energies are approximately 75 kJ mol1 for the pure 5CB sample in the nematic phase and 50 kJ mol1 for the 5 wt% silica-filled 5CB sample. These values are compared with the corresponding literature values. The reversible electro-mechanical response of these samples under the influence of an applied a.c. electric field is investigated.

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Language(s): eng - English
 Dates: 2003
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Method: -
 Identifiers: DOI: 10.1080/02678290310001602003
BibTex Citekey: ewiss_molecular_2003
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Title: Liquid Crystals
Source Genre: Journal
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Publ. Info: London : Taylor and Francis
Pages: - Volume / Issue: 30 (10) Sequence Number: - Start / End Page: 1241 - 1250 Identifier: ISSN: 0267-8292
CoNE: /journals/resource/954925268301