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Effect of sputtering with hydrogen dilution on fluorine concentration of low hydrogen content fluorinated amorphous carbon thin films with low dielectric constant
The fluorine concentration of fluorinated amorphous carbon (a-C:F) thin films with a low dielectric constant was controlled using magnetron sputtering with hydrogen gas dilution into CF4 gas. The stru...
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In recent years a number of models were proposed in which the electroplastic effect in the process of thermal fluctuation motion and generation of dislocations was considered to be a result of lowerin...

Influence of a surface electric field on the anchoring characteristics of nematic phases at rubbed polyimides

J. Appl. Phys. 86, 2473 (1999); doi:10.1063/1.371079

Issue Date: 1 September 1999

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Roland Meister and Blandine Jérôme
Instituut voor Technische Scheikunde, Universiteit van Amsterdam, Nieuwe Achtergracht 166, 1018 WV Amsterdam, The Netherlands
We report measurements of the anchoring energy of 5CB (4-cyano-4[prime]-n-pentyl-biphenyl) at a commercial polyimide (AL1051) with a method using a large applied electric field on thick measurement cells. The experiments reveal a deviation from the expected behavior of the system and cannot be described by the usual Frank elastic bulk energy density plus anchoring surface energy within the thermodynamic limit. We, therefore, discuss the effect of a surface electric field coupled to director distortions by the flexoelectric effect. Numerical calculations show, indeed, that the experiments can be described reasonably by the model. Experiments for thin cells indicate that the Debye screening length does not depend on the cell thickness. We derive an easy way to get an estimate of the Debye screening length from the experiments. ©1999 American Institute of Physics.
History: Received 29 December 1998; accepted 24 May 1999
Permalink: http://link.aip.org/link/?JAPIAU/86/2473/1
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KEYWORDS and PACS

Keywords
PACS
  • 61.30.Gd
    Structure of solids and liquids; crystallography Liquid crystals Orientational order of liquid crystals; electric and magnetic field effects on order
  • 68.35.Md
    Surfaces and interfaces; thin films and whiskers (structure and nonelectronic properties) Solid surfaces and solid–solid interfaces Surface energy; thermodynamic properties
  • 68.10.Cr
    Surfaces and interfaces; thin films and whiskers (structure and nonelectronic properties) Fluid surfaces and fluid–fluid interfaces Surface energy (surface tension, interface tension, angle of contact, etc.)
  • YEAR: 1999

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PUBLICATION DATA

ISSN:
0021-8979 (print)   1089-7550 (online)
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REFERENCES (18)
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