Easy axis memorization with active control of the azimuthal anchoring energy in nematic liquid crystals
Université de Lyon, Ecole Normale Supérieure de Lyon, Laboratoire de Physique, UMR 5672 of the CNRS 46 Allée d'Italie, 69364 Lyon Cedex 07, France, EU
Received: 16 May 2014
Accepted: 30 June 2014
I show how to measure with a rotating magnetic field the azimuthal anchoring energy in a nematic liquid crystal. This technique is used to study the dynamics of memorization of an easy axis when a sample treated for planar sliding anchoring with a liquid polymer is maintained during a long time in a fixed magnetic field parallel to the glass plates. A method to actively control the anchoring energy is proposed. The classical model of passivation of the surface by the polymer is discussed in view of my results.
PACS: 61.30.Hn – Surface phenomena: alignment, anchoring, anchoring transitions, surface-induced layering, surface-induced ordering, wetting, prewetting transitions, and wetting transitions
© EPLA, 2014