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  Director alignment by crossed electric and magnetic fields: a deuterium NMR study

Hamasuna, D., Luckhurst, G. R., Sugimura, A., Timimi, B. A., & Zimmermann, H. (2011). Director alignment by crossed electric and magnetic fields: a deuterium NMR study. Physical Review E, 84(1): 011705, pp. 1-11. doi:10.1103/PhysRevE.84.011705.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0024-12B4-8 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0024-12B5-6
Genre: Journal Article
Alternative Title : Director alignment by crossed electric and magnetic fields: a deuterium NMR study

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PhysRevE_ 84_2011_011705e.pdf (Any fulltext), 918KB
 
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 Creators:
Hamasuna, Daichi, Author
Luckhurst, Geoffrey R., Author
Sugimura, Akihiko, Author
Timimi, Bakir A., 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: The static director distribution in thin nematic liquid crystal cells, subject to both electric and magnetic fields, has been investigated using a combination of deuterium nuclear magnetic resonance (NMR) spectroscopy and continuum theory in terms of the director distribution function, which gives the probability density for finding the director at a given orientation. A series of deuterium NMR spectra for the nematic liquid crystal, 4−pentyl−d2−4−cyanobiphenyl deuteriated in the α position of the pentyl chain were acquired as a function of the applied electric field. This powerful experimental technique allowed us to observe uniform and nonuniform director alignment depending on the angle between the two fields and their relative strength. On the basis of the detailed experimental results, we have explored the factors that influence the nature of both the uniform and the nonuniform director distributions. We have discussed the questions that are raised by our attempt to understand the static director distribution as a function of the angle between the two fields. We have discovered that the alignment of the director at the surface of the Teflon spacers is essential in addition to the random variation in the cell thickness in order to account for the static director distribution determined from the NMR spectra

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Language(s): eng - English
 Dates: 2011-04-042011-07-15
 Publication Status: Published in print
 Pages: 11
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: eDoc: 664501
DOI: 10.1103/PhysRevE.84.011705
Other: 7692
 Degree: -

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Title: Physical Review E
  Other : Phys. Rev. E
Source Genre: Journal
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Publ. Info: Melville, NY : American Physical Society
Pages: - Volume / Issue: 84 (1) Sequence Number: 011705 Start / End Page: 1 - 11 Identifier: ISSN: 1539-3755
CoNE: https://pure.mpg.de/cone/journals/resource/954925225012