Analysis of Dielectric and Electro-optic Responses of Nanomaterials Doped Ferroelectric Liquid Crystal Mixture

Comparisons on Different Liquid Crystals Doped with Various Sized Gold Nanoparticles for Nonvolatile Memory Effects

“…Figure 9 shows that when the bias is turned off, the system can be restored to the initial conditions. In this case no inhibition of modes is present but a certain memory effect is appreciable.When the GNPs coated with MEO 2 MA 90 -co-OEGMA 10 brushes are utilized for doping, no memory effect is visible when a bias of 4 V is applied, indicative of the important role of the capping polymers …”

“…The memory effect is quite weak when larger GNPs, namely Au 30 @MEO 2 MA 90 -co-OEGMA 10 . The spectra confirm the influence of the nanoparticles on the behavior (Figure 13, 14 and 15).…”

“…In order to completely remove free polymers, the aqueous dispersions of the resulting gnps were purified by repetition of the cycle of centrifugation, decanting supernatant, and redispersion in water till the supernatants exhibit no thermoresponsivity. The resulting gnps were denoted as Aun@ MEO 2 MA 90 -co-OEGMA 10 , where n represents the GNP core sizes; it being 12 (see Figure 1) and 32(see Figure 2). …”

“…Helix distortion in any manner will lead to suppression of GM and the decrease in dielectric permittivity and GM strength; in other terms this decrease can be understood on the basis of molecular interaction between ferroelectric LC and gold nanoparticles [10][11][12]. Usually it is assumed that doping with gold nanoparticles enhances the disorder in ferroelectric LC.…”

Carbon Nanotubes in Liquid Crystals: Fundamental Properties and Applications

“…Dielectric and rotational viscosity measurements for FLC (smectic cyclohexane derivatives) doped (0.01 wt%) by silica nanoparticles (5-15 nm in diameter) and MWCNTs (110-170 nm in diameter, 5-9 μm in length) were carried out [224]. The lower value of the rotational viscosity and higher values of permittivity and dielectric losses were observed for silica-doped sample than those of MWCNT doped sample.…”