Can elastic constants and surface alignment be obtained from polarized microscopy images of nematic droplets? A Monte Carlo study

2018 ◽  
Vol 267 ◽  
pp. 158-165 ◽  
Author(s):  
C. Chiccoli ◽  
P. Pasini ◽  
C. Zannoni
Keyword(s):  
Monte Carlo ◽  
Elastic Constants ◽  
Monte Carlo Study ◽  
Surface Alignment ◽  
Polarized Microscopy ◽  
Microscopy Images

LATTICE SPIN SIMULATIONS OF TOPOLOGICAL DEFECTS IN NEMATIC FILMS WITH HYBRID SURFACE ALIGNMENTS

2011 ◽  
Vol 22 (05) ◽  
pp. 505-516 ◽  
Author(s):  
CESARE CHICCOLI ◽  
PAOLO PASINI ◽  
LUIZ ROBERTO EVANGELISTA ◽  
RODOLFO TEIXEIRA DE SOUZA ◽  
CLAUDIO ZANNONI
Keyword(s):  
Monte Carlo ◽  
Boundary Conditions ◽  
Elastic Constants ◽  
Elastic Anisotropy ◽  
Topological Defects ◽  
Monte Carlo Study ◽  
Lattice Spin ◽  
Polarized Microscopy ◽  
Microscopy Images

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.

LATTICE SPIN SIMULATIONS OF TOPOLOGICAL DEFECTS IN BIAXIAL NEMATIC FILMS WITH HOMEOTROPIC SURFACE ALIGNMENT

2013 ◽  
Vol 24 (05) ◽  
pp. 1350026 ◽  
Author(s):  
GOURIPEDDI SAI PREETI ◽  
CLAUDIO ZANNONI ◽  
CESARE CHICCOLI ◽  
PAOLO PASINI ◽  
VANKA S. S. SASTRY
Keyword(s):  
Monte Carlo ◽  
Boundary Conditions ◽  
Topological Defects ◽  
Monte Carlo Study ◽  
Surface Alignment ◽  
Lattice Spin ◽  
Polarized Microscopy ◽  
Wide Range ◽  
Microscopy Images ◽  
Biaxial Nematic

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.

scholarly journals From Point to Filament Defects in Hybrid Nematic Films

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Cesare Chiccoli ◽  
Paolo Pasini ◽  
Claudio Zannoni ◽  
Gregor Skačej ◽  
Hiroyuki Yoshida ◽  
...  
Keyword(s):  
Monte Carlo ◽  
Point Defects ◽  
Elastic Constants ◽  
3D Structure ◽  
Support Surface ◽  
Hybrid Films ◽  
Surface Ordering ◽  
Polarized Microscopy ◽  
Homeotropic Alignment

AbstractWe have studied nematic hybrid films with homeotropic alignment at the top surface and various controlled degrees of in plane ordering, going from a random degenerate organization to a completely uniform alignment along one direction, at the bottom one. We show, by Monte Carlo (MC) computer simulations and experiments on photopatterned films with the bottom support surface fabricated with in-plane order similar to the simulated ones, that the point defects observed in the case of random planar orientations at the bottom tend to arrange along a filament as the surface ordering is sufficiently increased. MC simulations complement the polarized microscopy texture observations allowing to inspect the 3D structure of the defects and examine the role of elastic constants.

Elastic constants and the formation of topological defects in hybrid nematic cells: A Monte Carlo study

2020 ◽  
Vol 102 (4) ◽  
Author(s):  
Cesare Chiccoli ◽  
Paolo Pasini ◽  
Luiz Roberto Evangelista ◽  
Gregor Skačej ◽  
Rodolfo Teixeira de Souza ◽  
...  
Keyword(s):  
Monte Carlo ◽  
Elastic Constants ◽  
Topological Defects ◽  
Monte Carlo Study

Elastic Constants of Solid Ar, Kr, and Xe: A Monte Carlo Study

1972 ◽  
Vol 6 (6) ◽  
pp. 2433-2442 ◽  
Author(s):  
M. L. Klein ◽  
R. D. Murphy
Keyword(s):  
Monte Carlo ◽  
Elastic Constants ◽  
Monte Carlo Study

Field effects on inversion walls in nematic films: A computer simulation study

2016 ◽  
Vol 27 (10) ◽  
pp. 1650114
Author(s):  
Cesare Chiccoli ◽  
Paolo Pasini ◽  
Luiz Roberto Evangelista ◽  
Rodolfo Teixeira De Souza ◽  
Claudio Zannoni
Keyword(s):  
Computer Simulation ◽  
Monte Carlo ◽  
External Field ◽  
Monte Carlo Simulations ◽  
Simulation Study ◽  
Computer Simulation Study ◽  
Spin Models ◽  
Polarized Microscopy ◽  
Lattice Spin Models ◽  
Microscopy Images

Monte Carlo simulations of lattice spin models are employed to investigate the effects of an external field on the creation and evolution of inversion walls in nematic films with conical boundary conditions. The simulations, based on the well known Lebwohl-Lasher potential, allow to produce simulated polarized microscopy images which are followed during their evolution when the field is applied.

On Defects in Biaxial Nematic Films with Random Planar Surface Alignment: A Monte Carlo Study

2013 ◽  
Vol 573 (1) ◽  
pp. 10-17 ◽  
Author(s):  
G. Sai Preeti ◽  
C. Chiccoli ◽  
P. Pasini ◽  
V. S. S. Sastry ◽  
C. Zannoni
Keyword(s):  
Monte Carlo ◽  
Monte Carlo Study ◽  
Planar Surface ◽  
Surface Alignment ◽  
Biaxial Nematic
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