Alignment-Inversion Walls in Nematic Liquid Crystals in the Presence of a Magnetic Field.

1969 ◽  
Vol 22 (24) ◽  
pp. 1342-1342 ◽  
Author(s):  
W. Helfrich
Keyword(s):  
Magnetic Field ◽  
Liquid Crystals ◽  
Nematic Liquid Crystals

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

1996 ◽  
Vol 222 (1-2) ◽  
pp. 113-118 ◽  
Author(s):  
E. Andreoli de Oliveira ◽  
G. Barbero ◽  
A.M. Figueiredo Neto ◽  
A.K. Zvezdin
Keyword(s):  
Magnetic Field ◽  
Liquid Crystals ◽  
Critical State ◽  
Dry Friction ◽  
Nematic Liquid Crystals

A DYNAMICAL METHOD FOR DETERMINING THE ELASTIC CONSTANTS AND RELAXATION PARAMETERS IN NEMATIC LIQUID CRYSTALS

2000 ◽  
Vol 14 (04) ◽  
pp. 139-146 ◽  
Author(s):  
EMIL PETRESCU ◽  
CORNELIA MOTOC ◽  
DOINA MANAILA
Keyword(s):  
Magnetic Field ◽  
Liquid Crystals ◽  
Elastic Constants ◽  
Light Transmission ◽  
Nematic Liquid Crystals ◽  
Relaxation Parameters ◽  
Nematic Director ◽  
Dynamical Method ◽  
The Magnetic Field ◽  
Good Agreement

The theoretical model proposed by Pieranski et al.3 to describe the phenomena occurring in nematic liquid crystals when the magnetic field is suddenly varied was extended by considering higher powers of the distortion angle for the nematic director. Equations giving the time evolution of the number of extinctions in the light transmission were obtained. These equations depend on some relaxation parameters (the time constants τA and τB intervening when the magnetic field was switched "on" or "off", respectively) and on the ratio of elastic constants. The equations were solved numerically and good agreement with the experimental data was obtained for the nematic MBBA.

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