Mean-field theory of isotropic-uniaxial nematic-biaxial nematic phase transitions in an external field

2019 ◽  
Vol 94 (2) ◽  
pp. 025702 ◽  
Author(s):  
Prabir K Mukherjee ◽  
Arnab Kumar De ◽  
Amitabha Mandal
Keyword(s):  
Field Theory ◽  
Phase Transitions ◽  
External Field ◽  
Nematic Phase ◽  
Mean Field Theory ◽  
Mean Field ◽  
Biaxial Nematic ◽  
Biaxial Nematic Phase

scholarly journals Volume Phase Transitions of Heliconical Cholesteric Gels under an External Field along the Helix Axis

Gels ◽  
2020 ◽  
Vol 6 (4) ◽  
pp. 40
Author(s):  
Akihiko Matsuyama
Keyword(s):  
Magnetic Field ◽  
Field Theory ◽  
Phase Transitions ◽  
External Field ◽  
Mean Field Theory ◽  
Mean Field ◽  
Helix Axis ◽  
Cholesteric Phase ◽  
Volume Phase ◽  
Phase Transition Temperatures

We present a mean field theory to describe cholesteric elastomers and gels under an external field, such as an electric or a magnetic field, along the helix axis of a cholesteric phase. We study the deformations and volume phase transitions of cholesteric gels as a function of the external field and temperature. Our theory predicts the phase transitions between isotropic (I), nematic (N), and heliconical cholesteric (ChH) phases and the deformations of the elastomers at these phase transition temperatures. We also find volume phase transitions at the I−ChH and the N−ChH phase transitions.

Role of molecular bend angle and biaxiality in the stabilization of the twist-bend nematic phase

Soft Matter ◽  
2020 ◽  
Vol 16 (18) ◽  
pp. 4350-4357 ◽  
Author(s):  
Wojciech Tomczyk ◽  
Lech Longa
Keyword(s):  
Field Theory ◽  
Nematic Phase ◽  
Mean Field Theory ◽  
Mean Field ◽  
Structural Features ◽  
Bend Angle ◽  
Nematic Phases

Within mean-field theory for V-shaped molecules, we have investigated how the alteration of a molecule's structural features influence the stabilization of modulated and non-modulated nematic phases.

scholarly journals Miscibility studies of two twist-bend nematic liquid crystal dimers with different average molecular curvatures. A comparison between experimental data and predictions of a Landau mean-field theory for the NTB–N phase transition

2016 ◽  
Vol 18 (6) ◽  
pp. 4394-4404 ◽  
Author(s):  
D. O. López ◽  
B. Robles-Hernández ◽  
J. Salud ◽  
M. R. de la Fuente ◽  
N. Sebastián ◽  
...  
Keyword(s):  
Field Theory ◽  
Experimental Data ◽  
Phase Transition ◽  
Liquid Crystal ◽  
Nematic Phase ◽  
Mean Field Theory ◽  
Mean Field ◽  
Landau Model ◽  
First Order ◽  
Miscibility Studies

We have developed a Landau model that predicts a first order twist-bend nematic–nematic phase transition.

Two-State Mean-Field Theory of Reentrant Phase Transitions

1985 ◽  
Vol 128 (1) ◽  
pp. 169-175 ◽  
Author(s):  
G. F. Kventsel ◽  
J. Katriel
Keyword(s):  
Field Theory ◽  
Phase Transitions ◽  
Mean Field Theory ◽  
Mean Field
Sign in / Sign up

Export Citation Format

Share Document