scholarly journals Influence of X7GeS5I (X = Ag, Cu) Superionic Nanoparticles on Structural Changes in Nematic Liquid Crystal

Crystals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 413
Author(s):  
Peter Bury ◽  
Marek Veveričík ◽  
Peter Kopčanský ◽  
Milan Timko ◽  
Ihor P. Studenyak ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Electric Field ◽  
Nematic Liquid Crystal ◽  
Acoustic Waves ◽  
Structural Changes ◽  
Light Transmission ◽  
Surface Acoustic Waves ◽  
Switching Behavior ◽  
Suspension Stability ◽  
Linearly Polarized

The effect of two types of superionic nanoparticles; Cu7GeS5I and Ag7GeS5I, respectively on nematic liquid crystal (6CB) behavior under an external electric field is investigated. The response of both attenuation of surface acoustic waves propagating along with the substrate/liquid crystal interface and light transmission are used to study the structural changes induced by applied electric field. The increasing/decreasing regime as well as jumped change of applied field were used. The light transmission was investigated using linearly polarized laser beam (532 nm) propagating through the liquid crystal. Results obtained from both measurements for three different concentrations (0.01, 0.05 and 0.10 wt%) and in addition two different sizes of nanoparticles are compared and results, relying on structural changes, suspension stability and switching behavior are evaluated.

SURFACE ACOUSTIC WAVE INDUCED OPTICAL EFFECTS IN A NEMATIC LIQUID CRYSTAL

1993 ◽  
Vol 07 (17) ◽  
pp. 1167-1171
Author(s):  
A. K. GEORGE
Keyword(s):  
Liquid Crystal ◽  
Theoretical Model ◽  
Acoustic Wave ◽  
Nematic Liquid Crystal ◽  
Acoustic Waves ◽  
Surface Acoustic Waves ◽  
Acoustic Streaming ◽  
Crystal Film ◽  
Optical Effects ◽  
Wave Induced

The optical changes occurring in a homeotropically aligned nematic liquid crystal film when excited by surface acoustic waves have been studied. Striped domains at low acoustic intensities followed by acoustic streaming at high intensities have been observed. The increase in transparency of the oriented liquid crystal film under the action of surface acoustic waves also has been investigated. The experimental results compare favourably with the available theoretical model based on the effect of rotation of the plane of polarization.

scholarly journals Study of Structural Changes in Nematic Liquid Crystals Doped with Magnetic Nanoparticles Using Surface Acoustic Waves

Crystals ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1023
Author(s):  
Peter Bury ◽  
Marek Veveričík ◽  
František Černobila ◽  
Peter Kopčanský ◽  
Milan Timko ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystals ◽  
Magnetic Nanoparticles ◽  
Electric Fields ◽  
Acoustic Waves ◽  
Structural Changes ◽  
Surface Acoustic Waves ◽  
Theoretical Background ◽  
Isotropic Phase ◽  
Structure Of Nanoparticles

The surface acoustic waves (SAWs) were used to study the effect of magnetic nanoparticles on nematic liquid crystal (NLC) behavior in weak magnetic and electric fields. The measurement of the attenuation of SAW propagating along the interface between piezoelectric substrate and liquid crystal is showed as an effective tool to study processes of structural changes. The magnetic nanoparticles Fe3O4 of nanorod shape and different low volume concentration were added to the NLC (4-(trans-4′-n-hexylcyclohexyl)-isothiocyanatobenzene (6CHBT)) during its isotropic phase. In contrast to undoped liquid crystals the distinctive different SAW attenuation responses induced by both magnetic and also electric fields in studied NLC samples were observed suggesting both structural changes and the orientational coupling between both magnetic and electric moments of nanoparticles and the director of the NLC molecules. Experimental measurements including the investigation under linearly increasing and/or jumped magnetic and electrical fields, respectively, as well as the investigation of temperature and time influences on structural changes were done. The investigation of the SAW anisotropy gives supplemental information about the internal structure of nanoparticles in investigated NLCs. In addition, some magneto-optical investigations were performed to support SAW results and study their stability and switching time. The analysis of observed SAW attenuation characteristics confirmed the role of concentration of magnetic nanoparticles on the resultant behavior of investigated NLC compounds. Obtained results are discussed within the context of previous ones. The theoretical background of the presented SAW investigation is introduced, too.

LIQUID CRYSTLASLIGHT SCATTERING BY FLUCTUATIONS INDUCED BY AN APPLIED ELECTRIC FIELD IN A NEMATIC LIQUID CRYSTAL (APAPA)

1972 ◽  
Vol 33 (C1) ◽  
pp. C1-63-C1-67 ◽  
Author(s):  
M. BERTOLOTTI ◽  
B. DAINO ◽  
P. Di PORTO ◽  
F. SCUDIERI ◽  
D. SETTE
Keyword(s):  
Liquid Crystal ◽  
Electric Field ◽  
Nematic Liquid Crystal ◽  
Applied Electric Field

scholarly journals Modeling Static Electric Field Effect on Nematic Liquid Crystal Director Orientation in Side-Electrode Cell

2018 ◽  
Vol 173 ◽  
pp. 03002 ◽  
Author(s):  
Alexander Ayriyan ◽  
Edik Ayryan ◽  
Alexandre Egorov ◽  
Maria Dencheva-Zarkova ◽  
Georgi Hadjichristov ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Electric Field ◽  
Nematic Liquid Crystal ◽  
Finite Difference Methods ◽  
Electric Field Effect ◽  
Dimensional Model ◽  
Static Electric Field ◽  
Electrode Cell ◽  
Field Influence ◽  
Director Orientation

A two-dimensional model of Fredericks effect was used for the investigation of the static electric field influence on nematic liquid crystal director orientation in the side-electrode cell. The solutions of the equations describing the model were obtained by finite-difference methods. Fredericks transition threshold for the central part of the cell, as well as dependencies of the distribution of the director orientation patterns on the electric field and location, were obtained. The numerical results are found to agree qualitatively with the experiment. Further investigations are needed to elucidate completely the Fredericks effect.

Light-transmission study of coarsening in a nematic liquid crystal

1992 ◽  
Vol 45 (4) ◽  
pp. R2169-R2172 ◽  
Author(s):  
R. Snyder ◽  
A. N. Pargellis ◽  
P. A. Graham ◽  
B. Yurke
Keyword(s):  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Light Transmission ◽  
Transmission Study
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