摘要 :
We present a Monte Carlo study of the effects of elastic anisotropy on the textures of nematic films with specific random hybrid boundary conditions. The polarized microscopy images and their evolution are analyzed in uniaxial sys...
展开
We present a Monte Carlo study of the effects of elastic anisotropy on the textures of nematic films with specific random hybrid boundary conditions. The polarized microscopy images and their evolution are analyzed in uniaxial systems for different values of the elastic constants.
收起
摘要 :
We present a detailed Monte Carlo study of the effects of biaxiality on the textures of nematic films with specific homeotropic boundary conditions. We have used the Straley generalized Hamiltonian for a wide range of biaxial para...
展开
We present a detailed Monte Carlo study of the effects of biaxiality on the textures of nematic films with specific homeotropic boundary conditions. We have used the Straley generalized Hamiltonian for a wide range of biaxial parameters and the differences obtained in the polarized microscopy images are analyzed for the various cases.
收起
摘要 :
We present a Monte Carlo study of the effects of elastic anisotropy on the textures of nematic droplets with different boundary conditions. Simulated polarized optical microscopy (POM) images are analysed for uniaxial nematics wit...
展开
We present a Monte Carlo study of the effects of elastic anisotropy on the textures of nematic droplets with different boundary conditions. Simulated polarized optical microscopy (POM) images are analysed for uniaxial nematics with radial, bipolar and toroidal boundaries and for numerous combinations of the splay, twist and bend elastic constant values. An atlas of simulated textures is presented as an aid to understanding new experimental results. (C) 2017 Elsevier B.V. All rights reserved.
收起
摘要 :
We revisit the classical problem of the molecular orientation inside a hybrid cell filled with liquid-crystals with various elastic constant anisotropies by means of Monte Carlo simulations using the Gruhn-Hess effective pair pote...
展开
We revisit the classical problem of the molecular orientation inside a hybrid cell filled with liquid-crystals with various elastic constant anisotropies by means of Monte Carlo simulations using the Gruhn-Hess effective pair potential. We find some unstable defect lines and we discuss their arising in the system. We study the effects of the elastic anisotropy on the profiles of the director close to the surface with weak anchoring. Our findings indicate that the elastic theory and computer simulations are in good qualitative agreement while quantitatively some discrepancies are found mainly when the ratio K-11/K-33 is larger than one.
收起
摘要 :
We present detailed Monte Carlo simulations of a simple model of a nematic liquid crystal channel waveguide investigating the effect of an applied electric external field. The simulations are based on the Lebwohl-Lasher lattice sp...
展开
We present detailed Monte Carlo simulations of a simple model of a nematic liquid crystal channel waveguide investigating the effect of an applied electric external field. The simulations are based on the Lebwohl-Lasher lattice spin model with boundary conditions chosen to mimic the homeotropic anchoring appropriate for PDMS polymer walls. The external field is modeled by adding an additional term to the Hamiltonian which describes its coupling to the mesogenic molecules. We have investigated the effect of the external field on the optical transmission and the ordering across the cell.
收起
摘要 :
We present detailed Monte Carlo (MC) simulations of a nematic cell with homeotropic boundary conditions at the four confining surfaces. The simulations are based on the Lebwohl-Lasher lattice spin model with boundary conditions ch...
展开
We present detailed Monte Carlo (MC) simulations of a nematic cell with homeotropic boundary conditions at the four confining surfaces. The simulations are based on the Lebwohl-Lasher lattice spin model with boundary conditions chosen to mimic the cell anchoring. We have investigated the model using a standard Metropolis Monte Carlo method to study the optical transmission and the ordering through the cell.
收起
摘要 :
Nematic systems confined to a bounded volume are particularly interesting because they present stable structure defects induced by the anchoring conditions on the surface. Here we present a Monte Carlo study of a hybrid nematic fi...
展开
Nematic systems confined to a bounded volume are particularly interesting because they present stable structure defects induced by the anchoring conditions on the surface. Here we present a Monte Carlo study of a hybrid nematic film with various strengths of coupling with the surfaces.
收起
摘要 :
The biaxial nematic phase diagram for the second rank Straley quadrupolar pair potential, as explored until now, implies that a direct transition from a biaxial nematic to an isotropic phase can occur, either at a single Landau po...
展开
The biaxial nematic phase diagram for the second rank Straley quadrupolar pair potential, as explored until now, implies that a direct transition from a biaxial nematic to an isotropic phase can occur, either at a single Landau point or even, as recently shown using mean field theory, along a line. We show by an extensive Monte Carlo investigation that a different topology can be found in a wide region of parameter space, with the passage from biaxial to isotropic always going through a uniaxial phase. We argue that this may hint in part at the difficulty in realising a biaxial nematic phase.
收起
原文获取