Electrically charged dispersions of ferroelectric nanoparticles

Abstract

International audienceno abstrac

Terahertz properties of liquid crystals doped with ferroelectric BaTiO3 nanoparticles

“…The presence of larger particles may interfere with the homogeneity of the liquid crystal, and thus destroy the orientation of the LC molecules, while the smaller particles lose their ferroelectric properties [7]. Previous work [9,10,[13][14][15][16] has shown that the preparation of ferroelectric nanoparticles is a difficult process. In recent years, one found new processes for the production of BaTiO 3 ferroelectric nanoparticles, including sol-gel method, hydrothermal method, molten salt method, mechanochemical synthesis or combustion synthesis [17,18].…”

“…This dipole-dipole interaction may provide to an increase of the order parameter of LC and thus the dielectric anisotropy and birefringence of the ferroelectric LC suspension. However, the nature of interactions are clearly more complex, as for example, the nps are likely to be charged as well, as recently demonstrated [9].…”

Threshold properties of nanodoped surface stabilized ferroelectric liquid crystals under electric and magnetic fields

“…In particular, nanophysics of liquid crystals are a rapidly expanding field of soft matter science for the fascinating fundamental and technological perspectives [6]. Burylov and Zakhlevnykh studied the conditions of existence of different orientational states for a suspension of ferromagnetic particles in nematic liquid crystals, in an external magnetic field [7].…”

Ion trapping by means of ferroelectric nanoparticles, and the quantification of this process in liquid crystals

“…In addition to the nanoparticle aggregation and percolation phenomena, possible effects of charge generation by nanoparticles subjected to the high electric field should be taken into account to ensure the correct interpretation of the experimental data. 34 For example, these factors could be among possible reasons for the observed increase in the electrical conductivity of the system "nematic liquid crystalSn 2 P 2 S 6 ." 35 According to Ref.…”