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  Wetting behaviour of 5CB and 8CB and their binary mixtures above the isotropic transition

Zaki Ewiss, M. A., Nabil, G., Schlagowski, S., & Herminghaus, S. (2004). Wetting behaviour of 5CB and 8CB and their binary mixtures above the isotropic transition. Liquid Crystals, 31(4), 557-566. doi:10.1080/02678290410001666048.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0029-7FD5-D Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0029-7FD6-B
Genre: Journal Article

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 Creators:
Zaki Ewiss, M. A.1, Author
Nabil, G., Author
Schlagowski, S., Author
Herminghaus, S.2, 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: High resolution optical microscopy techniques have been employed to study the wetting properties of (5CB) x /(8CB)100-x (x=0, 10, 30, 50, 70, 90, and 100 wt %) binary mixture liquid crystal thin films above the isotropic transitions. Dewetting is found to occurr at T w=65 and 42.5°C for the 5CB and 8CB samples, respectively, and to depend strongly on the 5CB content in the mixtures. First-order wetting transitions were seen for pure 5CB and 8CB samples; a higher order wetting transitions were obtained for the mixtures. For thin film 5CB, a large hysteresis (ΔT=30°C) between wetting and dewetting during the heating and cooling is obtained. This hysteresis is compared with the corresponding values obtained for pure 8CB and mixture samples. Evidence of the formation of nematic layers on the surface of isotropic droplets was found. Attempts to extract values of the contact line tension for these materials are made. In this respect the applicability of the modified Young's equation is questionable.

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Language(s): eng - English
 Dates: 2004
 Publication Status: Published in print
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 Rev. Method: -
 Identifiers: DOI: 10.1080/02678290410001666048
BibTex Citekey: author_wetting_2004
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Title: Liquid Crystals
Source Genre: Journal
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Publ. Info: London : Taylor & Francis
Pages: - Volume / Issue: 31 (4) Sequence Number: - Start / End Page: 557 - 566 Identifier: ISSN: 0267-8292
CoNE: /journals/resource/954925268301