TITLE

Scattering of gases from aligned liquid crystals: Collision-induced loss of order at the gas–liquid interface

AUTHOR(S)
Randall, Karen L.; Fan, Y. B.; Michel, Oliver; Goh, M. Cynthia; Donaldson, D. J.
PUB. DATE
December 1996
SOURCE
Journal of Chemical Physics;12/1/1996, Vol. 105 Issue 21, p9574
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
An atomic beam of helium is scattered from the surface of an aligned nematic liquid crystal film (4′-pentyl-4-cyanbo biphenyl, 5CB). Collisions of atoms with the surface initiate a transient loss of order in the film. The magnitude of this change depends on the momentum direction of the atomic beam with respect to the liquid crystal alignment director. The effect is significantly more pronounced when the incoming beam is perpendicular to the director than when it is parallel. This anisotropy may be due to a more efficient alignment-changing torque exerted on the 5CB molecules by perpendicular collisions with He. © 1996 American Institute of Physics.
ACCESSION #
7610500

 

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