Surface breaking in lyotropic nematic liquid crystals induced by a magnetic field

AL Alexe-Ionescu, LM Vega, JJ Bonvent, EA Oliveira - Physical Review E, 1999 - APS
The twist deformation induced by a magnetic field H in a lyotropic liquid crystal is analyzed.
Our results show the existence of three regimes for the surface deformation related to two …

Periodic deformations induced by a magnetic field in planar twisted nematic layers

D Krzyzański, G Derfel - Liquid crystals, 2002 - Taylor & Francis
Magnetic field-induced spatially periodic deformations of planar nematic layers twisted by an
angle Φ were investigated numerically. Chiral nematics with pitches compatible with the …

Dynamical behavior of a nematic lyotropic liquid crystal in flat confined samples

IH Bechtold, JJ Bonvent, EA Oliveira - Physical Review E, 2001 - APS
We investigate the dynamical behavior of the director in the surface layer of lyotropic
nematic liquid crystals in an external magnetic field. The characteristic time of the orientation …

A phase transition-like instability in static samples of twisted nematic liquid crystal when the surfaces induce tilted alignments

G Porte, JP Jadot - Journal de Physique, 1978 - jphys.journaldephysique.org
There has been, in recent years, a great interest in twisted orientation patterns in static
samples of nematic liquid crystals (NLC). Here we investigate the behaviour of such …

Weak anchoring effects in nematic liquid crystals

G McKay, KJ Kidney, IW Stewart - Molecular Crystals and Liquid …, 2007 - Taylor & Francis
We consider a twisted nematic liquid crystal confined by two parallel boundary plates. The
nematic is subject to an in-plane magnetic field applied in a direction parallel to the plates …

Director orientation of a twisted nematic under the influence of an in-plane magnetic field

H Millar, G Mckay - Molecular Crystals and Liquid Crystals, 2005 - Taylor & Francis
We consider an incompressible nematic liquid crystal that exhibits an equilibrium twist
profile across the cell due to in-plane but opposing anchoring directions at the plates. We …

Critical orientational states in lyotropic liquid crystals induced by a magnetic field

LM Vega, JJ Bonvent, G Barbero, EA Oliveira - Physical Review E, 1998 - APS
The existence of a critical state in a lyotropic liquid crystal has been recently predicted,
induced by a magnetic field and corresponding to a uniform orientation parallel to the …

Dry-friction and critical state in lyotropic nematic liquid crystals in a magnetic field

EA de Oliveira, G Barbero, AMF Neto, AK Zvezdin - Physics Letters A, 1996 - Elsevier
The surface properties of planarly oriented lyotropic nematic liquid crystals are theoretically
described by means of a model based on the dry-friction like interaction among the nematic …

Dynamics of the field-induced twist deformation in weakly anchored nematic layers

G Derfel, B Gajewska - Liquid crystals, 1997 - Taylor & Francis
The dynamics of the field-induced one-dimensional twist deformation in weakly anchored
nematic layers was investigated by means of numerical simulation. The rise time constants …

Pattern formation in a twisted nematic liquid crystal cell under an external magnetic field

L Carlotti, S Faetti, M Nobili - Journal de Physique II, 1996 - jp2.journaldephysique.org
We analyze the spatially inhomogeneous dynamic behaviour of twisted NLC layer in a
magnetic field. When a magnetic field H is applied in the layer plane at a suitable angle …