Modification of AFLC Physical Properties by Doping with BaTiO₃ Particles

Abstract

In this paper, for the first time, the influence of the BaTiO3 particles on the antiferroelectric liquid crystalline phase was shown. Low concentrations and two different sizes of BaTiO3 particles (nano- and submicroparticles) were used. It was found that admixture of the ferroelectric particles causes a decrease in the concentration of free ions in the liquid crystal matrix. Despite the small amount of admixture, a decrease in spontaneous polarization, switching time and rotational viscosity, was observed, while the tilt angle of molecules and the smectic layer thickness did not change. It turns out that BaTiO3 particles have a very large impact on the dielectric spectra not only in the antiferroelectric phase but also in the ferroelectric and paraelectric phases of the polymorphic mixture studied. The dopants affect also the complex conductivity. In this paper, we explain why some properties are modified by BaTiO3 particles and others are not.

The impact of ionic contribution to dielectric permittivity in 11CB liquid crystal and its colloids with BaTiO3 nanoparticles

“…Finally, we would like to address Eqs. ( 3) and ( 4), which are often recalled when discussing dielectric spectra in the LF domain [32][33][34][35][36][37][38][39][40]. The above discussion validated Eq.…”

“…1. For discussing this behavior, two relations are explored in LC materials and their nanocomposites [32][33][34][35][36][37][38][39][40]:…”

Modifications of FLC Physical Properties through Doping with Fe2O3 Nanoparticles (Part I)

“…30–50 nm), the nematic–isotropic liquid phase transition temperature increases by almost 40 °C, as well as an increase in dielectric and optical anisotropy is observed [ 13 ]. By doping antiferroelectric liquid crystal mixture with BaTiO 3 nanoparticles, we obtained faster molecular switching, a drop in threshold voltage and spontaneous polarization, as a result of modification of the local electric field [ 14 ]. In turn, Manepalli et al showed that the self-organization of ZnO nanoparticles (ca.…”

Donor-π-Acceptor-Type Fluorinated Tolane Containing a Semifluoroalkoxy Chain as a Condensed-Phase Luminophore

“…In 2a , which has a short fluoroalkyl moiety, no diffraction peak corresponding to the (001) plane index was observed ( Figure S18a ). It is considered that the fluorine atoms in the flexible chain formed an interdigitate structures, which formed many defects in the layer structure and reduced the domain size [ 24 , 25 ]. In contrast, 2b and 2c , which has an elongated fluoroalkyl structure, exhibited diffraction peaks corresponding to the (001) plane at 2 θ = 2.46° and 2.22°, respectively ( Figure 5 d and Figure S18e ).…”