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Article
What Aligns Liquid Crystals on Solid Substrates? the Role of Surface Roughness Anisotropy
Physical Review Letters
  • Satyendra Kumar, Kent State University - Kent Campus
  • Jae-Hoon Kim, Kent State University - Kent Campus
  • Yushan Shi, Kent State University - Kent Campus
Publication Date
2-25-2005
Document Type
Article
DOI
10.1103/PhysRevLett.94.077803
Keywords
  • Films,
  • Morphology,
  • Polyimide,
  • Polymers,
  • Angles
Disciplines
Abstract
The mechanism responsible for liquid crystal (LC) alignment on mechanically buffed or UV exposed polymer films is poorly understood. A comprehensive study of LC alignment on variously prepared substrates unequivocally shows that the anisotropy in the surface roughness of the substrate completely determines the direction of LC alignment. In all the cases studied, including those where an anchoring transition occurs with temperature, the LC director (re)aligns in the directions of low roughness.
Comments

Copyright 2005 American Physical Society. Available on publisher's site at http://dx.doi.org/10.1103/PhysRevLett.94.077803.

Citation Information
Satyendra Kumar, Jae-Hoon Kim and Yushan Shi. "What Aligns Liquid Crystals on Solid Substrates? the Role of Surface Roughness Anisotropy" Physical Review Letters Vol. 94 Iss. 7 (2005)
Available at: http://works.bepress.com/satyendra_kumar/22/