45 research outputs found
Electric field induced order reconstruction in a nematic cell
We have experimentally observed the biaxial switching between two topologically distinct textures
of a nematic liquid crystal cell submitted to a strong electric field. The effect is deduced from optical
and electrical measurements across the cell. Above a static threshold, a bulk order reconstruction is observed,
where the final nematic orientation in the centre becomes perpendicular to its initial one, inducing
a total π change of orientation across the cell. Using short electric field pulses, a higher dynamical threshold
is observed. These experiments are explained by a Landau-de Gennes-Khalatnikov model. The threshold
implies the local exchange of two eigenvalues of the nematic order tensor through intermediate biaxial
states. The onset of the effect in a thin splay-bend wall decreases the static threshold by almost an order of
magnitude. The model explains reasonably well the static and dynamic measurements within the present
description of nematic biaxiality
Induced ferroelectric salicylidenanylene liquid crystals electrooptical properties and applications
EFFECTS OF CROSS-BORDER MERGERS AND ACQUISITIONS ON GDP PER CAPITA AND DOMESTIC INVESTMENT IN TRANSITION COUNTRIES
Nanoribbons from conjugated macromolecules on amorphous substrates observed by SFM and TEM
Shape amphiphiles: mixing rods and disks in liquid crystals
Mixtures of rodlike and disklike liquid crystals suffer from phase separation. However, such mixtures can be homogenized if a molecule is added which comprises a rod- and a disklike fragment linked together covalently. We have termed such a molecule a shape amphiphile and believe that this represents a new class of amphiphilicity