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Science 22 June 2001:
Vol. 292. no. 5525, pp. 2299 - 2302
DOI: 10.1126/science.1059866
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Reports

Liquid Crystal Alignment on Carbonaceous Surfaces with Orientational Order

J. Stöhr,1* M. G. Samant,1 J. Lüning,1* A. C. Callegari,2 P. Chaudhari,2 J. P. Doyle,2 J. A. Lacey,2 S. A. Lien,2 S. Purushothaman,2 J. L. Speidell2

We used near-edge x-ray absorption fine structure (NEXAFS) spectroscopy to link the orientational bond order at three carbonaceous surfaces--rubbed polyimide, ion beam-irradiated polyimide, and ion beam-irradiated diamondlike carbon films--with the direction of liquid crystal (LC) alignment on these surfaces. We show that, in general, LC alignment can be created on any carbonaceous substrate by inducing orientational order at its surface. Our results form the scientific basis for LC alignment layers consisting of amorphous carbon films in which orientational order near the surface is induced by a directional low-energy ion beam.

1 IBM Research Division, Almaden Research Center, 650 Harry Road, San Jose, CA 95120, USA.
2 IBM Research Division, T. J. Watson Research Center, Post Office Box 218, Yorktown Heights, NY 10598, USA.
*   Present address: Stanford Synchrotron Radiation Laboratory, Post Office Box 20450, Mail Stop 69, Stanford, CA 94309, USA.

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THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Carbon (1s) NEXAFS Spectroscopy of Biogeochemically Relevant Reference Organic Compounds.
D. Solomon, J. Lehmann, J. Kinyangi, B. Liang, K. Heymann, L. Dathe, K. Hanley, S. Wirick, and C. Jacobsen (2009)
Soil Sci. Soc. Am. J. 73, 1817-1830
   Abstract »    Full Text »    PDF »
Rubbed Thin Films of Well-defined Brush Polyimides for Flat-Panel Liquid Crystal Displays: Surface Morphology, Molecular Orientation, and Liquid Crystal Alignability.
S. G. Hahm, S. W. Lee, J. Suh, B. Chae, S. B. Kim, S. J. Lee, K. H. Lee, J. C. Jung, and M. Ree (2006)
High Performance Polymers 18, 549-577
   Abstract »    PDF »


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