Effect of polymeric nanoparticles on dielectric and electro-optical properties of ferroelectric liquid crystals

Abstract

It has been observed that the polymeric nanoparticles, copolymer of polybenzene and anthracene ͑PBA NPs͒, can induce a homeotropic ͑HMT͒ alignment in various ferroelectric liquid crystal ͑FLC͒ mixtures. The HMT alignment of various FLCs is attributable to the fact that the anthracene molecules favor an upright orientation ͑with a little tilt͒ on the surfaces of indium tin oxide and this upright orientation of anthracene molecules works as a template to align FLC molecules homeotropically. It has been concluded that the addition of ϳ0.5 wt % of PBA NPs is enough to induce a HMT alignment in a FLC material Felix 17/100. The influence of the PBA NPs concentrations on the transition temperature, physical constants ͑such as spontaneous polarization, rotational viscosity, and response time͒ and dielectric relaxation processes of FLC material ͑Felix 17/100͒ has also been investigated.

Reduction of optical response time for fluorescent dye doped ferroelectric liquid crystal

“…The lower value of the effective dielectric permittivity also shows that dipole moment of dye molecules and dipole moment of pure FLC are in the opposite N S N Benzo 2,1,3 thiadiazole direction. When the fluorescent dye is used for the doping into pure FLC then there are three interactions that take place (1) Interaction between the FLC and FLC molecules (2) Interaction between the fluorescent dye and FLC molecules (3) Interaction between the fluorescent dye and fluorescent dye molecules.…”

“…The FLC materials are useful in these applications due to their lower driving voltage, gray scale generation capability, easily achievable alignment and fast optical response [2]. The liquid crystal displays (LCDs) are more popular due to their low weight, thin shape and low power consumption.…”

“…Ferroelectric liquid crystals (FLCs) are the most promising materials for displays as well as non display applications in the modern technology [1][2][3][4]. The FLC materials are useful in these applications due to their lower driving voltage, gray scale generation capability, easily achievable alignment and fast optical response [2].…”

Nano-Objects and Ions in Liquid Crystals: Ion Trapping Effect and Related Phenomena

“…%) was reported in [210]. The trapping of ions by PBA nanoparticles was proposed to explain the measured decrease in  [210].…”

“…Conducting nanofiber NLC Increase in the conductivity [208,209] Polymeric nanoparticles FLC Decrease in dielectric losses [210] Nanoclay (montmorillonite) NLC Ion trapping, time dependent properties, and aggregation [211][212][213][214][215][216][217] x x S ZnO …”