scholarly journals Induced Magnetic Anisotropy in Liquid Crystals Doped with Resonant Semiconductor Nanoparticles

2016 ◽  
Vol 2016 ◽  
pp. 1-9
Author(s):  
Vicente Marzal ◽  
Juan Carlos Torres ◽  
Isabel Pérez ◽  
José Manuel Sánchez-Pena ◽  
Braulio García-Cámara
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystals ◽  
Magnetic Anisotropy ◽  
Effective Medium Theory ◽  
Semiconductor Nanoparticles ◽  
Medium Theory ◽  
Induced Magnetic Anisotropy ◽  
Different Types ◽  
Effective Magnetic Permeability ◽  
Electrooptical Properties

Currently, there are many efforts to improve the electrooptical properties of liquid crystals by means of doping them with different types of nanoparticles. In addition, liquid crystals may be used as active media to dynamically control other interesting phenomena, such as light scattering resonances. In this sense, mixtures of resonant nanoparticles hosted in a liquid crystal could be a potential metamaterial with interesting properties. In this work, the artificial magnetism induced in a mixture of semiconductor nanoparticles surrounded by a liquid crystal is analyzed. Effective magnetic permeability of mixtures has been obtained using the Maxwell-Garnett effective medium theory. Furthermore, permeability variations with nanoparticles size and their concentration in the liquid crystal, as well as the magnetic anisotropy, have been studied.

scholarly journals Multifrequency Driven Nematics

Crystals ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 275 ◽  
Author(s):  
Noureddine Bennis ◽  
Jakub Herman ◽  
Aleksandra Kalbarczyk ◽  
Przemysław Kula ◽  
Leszek R. Jaroszewicz
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystals ◽  
Electric Fields ◽  
Dielectric Anisotropy ◽  
Dielectric Measurements ◽  
Frequency Tunability ◽  
Frequency Tunable ◽  
Electrooptical Properties ◽  
Crystal Characterization

Liquid crystals act on the amplitude and the phase of a wave front under applied electric fields. Ordinary LCs are known as field induced birefringence, thus both phase and amplitude modulation strongly depend on the voltage controllable molecular tilt. In this work we present electrooptical properties of novel liquid crystal (LC) mixture with frequency tunable capabilities from 100Hz to 10 KHz at constant applied voltage. The frequency tunability of presented mixtures shown here came from composition of three different families of rodlike liquid crystals. Dielectric measurements are reported for the compounds constituting frequency-controlled birefringence liquid crystal. Characterization protocols allowing the optimum classification of different components of this mixture, paying attention to all relevant parameters such as anisotropic polarizability, dielectric anisotropy, and dipole moment are presented.

Phase transitions and fluidity characteristics of lipids and cell membranes

1975 ◽  
Vol 8 (2) ◽  
pp. 185-235 ◽  
Author(s):  
D. Chapman
Keyword(s):  
Phase Transitions ◽  
Liquid Crystal ◽  
Liquid Crystals ◽  
Living Cell ◽  
Molecular Orientation ◽  
Liquid Crystalline ◽  
Crystalline Solid ◽  
Living Tissue ◽  
Liquid Crystal Phase ◽  
Different Types

The concept that the liquid crystalline or mesomorphic condition was of importance to biological systems is a relatively old idea. Thus Bernal (1933) when discussing the different types of arrangements of molecules in liquid crystals commented ‘Such structures belong to the liquid crystal as a unit and not to its molecules which may be replaced by others without destroying them and they persist in spite of the complete fluidity of the substance. These are just the properties to be required for a degree of organization between that of the continuous substance, liquid or crystalline solid and even the simplest living cell.’ Stewart (1961) some thirty years later also stated that ‘It is this property – the combination of flow and lability with a preferred and relatively stable molecular orientation – that makes the mesomorphic (i.e. liquid crystal) phase uniquely appropriate to the structure of protoplasm and living tissue.’

scholarly journals Comparative electrooptic study of new orthoconic liquid crystals with fluorinated alkoxy terminal chains

2010 ◽  
Vol 18 (2) ◽  
Author(s):  
A. Spadło ◽  
E. Otón ◽  
R. Dąbrowski ◽  
M. Żurowska ◽  
J. Otón ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystals ◽  
Dynamic Range ◽  
Response Times ◽  
Dynamic Performance ◽  
Electrooptical Properties

AbstractElectrooptical properties of several new orthoconic antiferroelectric liquid crystal mixtures with partially fluorinated alkoxyalkoxy terminal chains have been investigated in order to select the best mixture for display applications. Electrooptical studies have been performed on these orthoconic materials aiming at evaluating their static and dynamic performance under passive multiplexing conditions. A number of parameters have been evaluated, static and dynamic contrast, driving scheme for passive multiplexing, rise and fall response times, dynamic range, and dynamic greyscale.

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