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  Surface ordering at the air-nematic interface. Part 1. A neutron reflection study of translational order.

Lau, Y. G. J., Richardson, R. M., Dalgliesh, R. M., & Zimmermann, H. (2007). Surface ordering at the air-nematic interface. Part 1. A neutron reflection study of translational order. Liquid Crystals, 34(3), 333-341. doi:10.1080/02678290601116316.

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Item Permalink: https://hdl.handle.net/11858/00-001M-0000-002C-AAE5-B Version Permalink: https://hdl.handle.net/11858/00-001M-0000-002C-AAE6-9
Genre: Journal Article
Alternative Title : Surface ordering at the air-nematic interface. Part 1. A neutron reflection study of translational order.

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LiqCryst_34_2007_333.pdf (Any fulltext), 515KB
 
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Lau, Y. G. J., Author
Richardson, R. M., Author
Dalgliesh, R. M., Author
Zimmermann, Herbert1, 2, Author           
Affiliations:
1Department of Molecular Physics, Max Planck Institute for Medical Research, Max Planck Society, ou_1497705              
2Department of Biomolecular Mechanisms, Max Planck Institute for Medical Research, Max Planck Society, ou_1497700              

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 Abstract: Neutron reflection was used to measure the build‐up of layers at the air surface as the smectic phase was approached from higher temperatures in a nematic liquid crystal. The liquid crystal was 4‐octyl‐4′‐cyanobiphenyl with a deuterated core and hydrogenous tails. The development of surface smectic layers in the nematic phase was followed by measuring specular reflectivity and monitoring the pseudo‐Bragg peak from the layers. The pseudo‐Bragg peak therefore corresponded to the formation of long‐range smectic layers at the surface as the transition temperature is approached. The results were consistent with the continuous growth of smectic layers at the surface and the amplitude of the smectic density wave decayed with increasing distance from the surface. The depth over which the smectic layering occurred at the interface was found to be ∼450 Å at a quarter of a degree above the nematic to smectic A bulk transition. The smectic order parameter at the surface was ∼0.1 which is much less that found for typical homeotropic alignment agents.

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Language(s): eng - English
 Dates: 2006-05-192006-09-062007-03-292007-03-29
 Publication Status: Issued
 Pages: 9
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: eDoc: 665272
DOI: 10.1080/02678290601116316
URI: http://www.tandfonline.com/doi/abs/10.1080/02678290601116316
URI: http://www.tandfonline.com/doi/full/10.1080/02678290601116316
URI: http://www.tandfonline.com/doi/pdf/10.1080/02678290601116316
Other: 6784
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Title: Liquid Crystals
Source Genre: Journal
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Publ. Info: London : Taylor & Francis
Pages: - Volume / Issue: 34 (3) Sequence Number: - Start / End Page: 333 - 341 Identifier: ISSN: 0267-8292
CoNE: https://pure.mpg.de/cone/journals/resource/954925268301