Higher-order surface free energy in azimuthal nematic anchoring on nanopatterned grooves

Jin Seog Gwag; Jin Hyuk Kwon; Masahito Oh-e; Jun-Ichi Niitsuma; Makoto Yoneya; Hiroshi Yokoyama

doi:10.1063/1.3225556

Higher-order surface free energy in azimuthal nematic anchoring on nanopatterned grooves

Jin Seog Gwag, Jin Hyuk Kwon, Masahito Oh-e, Jun-Ichi Niitsuma, Makoto Yoneya Hiroshi Yokoyama

Applied Physics Letters, Vol.95(10), 103101

2009

: https://doi.org/10.1063/1.3225556

: WOS:000269723500047

Physics and Astronomy (miscellaneous)

The higher-order component in liquid crystal (LC) surface free energy beyond the Rapini-Papoular anchoring potential was examined for azimuthal anchoring by analyzing nematic LC alignment on nanogrooved surfaces treated by rubbing or photoalignment. We confirmed that the surface anchoring energy for large director deviations cannot be properly described with the Rapini-Papoular form and should include higher order contributions in a power series of sin ² φ, as ∑ ² _n=1 W _n sin ²ⁿ φ, with φ being the azimuthal angular deviation. Based on the corrected Berreman's theory, we obtained the anchoring ratio between the first and second order terms, W ₂ /W ₁ ≈-1/4, and the surface elastic constant, K ₂₄ ≈-0.846K ₂₂ , for 4-n-pentyl- 4′ -cyanobiphenyl. © 2009 American Institute of Physics.

research.portal.fulldisplay.incitesHighlights.intro

esploro.research.conf.research.portal.label.prefix.inciteCollaboration: research.portal.fulldisplay.incitesHighlights.institutionCollaboration; research.portal.fulldisplay.incitesHighlights.internationalCollaboration
esploro.research.conf.research.portal.label.prefix.inciteCitationTopics: 2 Chemistry; 2.234 Photochemistry; 2.234.78 Liquid Crystals
esploro.research.conf.research.portal.label.prefix.inciteWOSResearchAreas: Physics, Applied
esploro.research.conf.research.portal.label.prefix.inciteESIResearchAreas: Physics

: Higher-order surface free energy in azimuthal nematic anchoring on nanopatterned grooves
: Higher-order surface free energy in azimuthal nematic anchoring on nanopatterned grooves
: Jin Seog Gwag (Author) - Yeungnam University
Jin Hyuk Kwon (Author) - Yeungnam University
Masahito Oh-e (Author) - Japan Science and Technology Agency
Jun-Ichi Niitsuma (Author) - Japan Science and Technology Agency
Makoto Yoneya (Author) - National Institute of Advanced Industrial Science and Technology
Hiroshi Yokoyama (Author) - Japan Science and Technology Agency
: Journal article
: 2009
: Applied Physics Letters, Vol.95(10), 103101
: English