Liquid Crystal Alignment on Carbonaceous Surfaces with Orientational Order

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Science  22 Jun 2001:
Vol. 292, Issue 5525, pp. 2299-2302
DOI: 10.1126/science.1059866

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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.

  • * Present address: Stanford Synchrotron Radiation Laboratory, Post Office Box 20450, Mail Stop 69, Stanford, CA 94309, USA.

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