Orthoconic antiferroelectric liquid crystals

34.3: Fast Orthoconic Antiferroelectric Liquid Crystals for Field‐Sequential Color Applications

“…Electrical wires were soldered onto the ITOpads by using an ultrasonic soldering tool. We used the OAFLC mixture W182 [13,14], cf. Fig.…”

Design, synthesis and mesomorphic properties of chiral benzoates and fluorobenzoates with direct SmCA*-Iso phase transition

“…Also a big asymmetry between τ on and τ off response times is observed because in smectic layers near the surface, a ferroelectric order is preferred and relatively high rotational viscosity is observed. [1] In the material with SmC A *-Iso phase transition, the high tilt is generated rapidly during phase formation and the layers do not change nearly their dimension during cooling, so layer shrinkage is very small and because no phase transitions are present during further cooling the number of defects should be very limited, especially zigzag type (reverse tilt layer). Big molecular monodomain structures are easy to grow during slow cooling.…”

“…The OAFLCs differ in optical properties to regular (low tilted) AFLCs. [1] The cells with surface stabilised geometry (SSOAFLCs) and zero external electric fields are an optically uniaxial and optically negative medium (Δn = n e − n 0 < 0), with the optical axis perpendicular to the substrates plane, whereas low-tilted antiferroelectrics are always a optically positive biaxial medium (Δn = n e − n 0 > 0) with the optical axis in the plane of the border surfaces. SSOAFLCs between crossed polarisers behave as optically isotropic mediums at zero field [2,3] for the light beam pending normal to the cell plane.…”

Helix parameters in bi- and multicomponent mixtures composed of orthoconic antiferroelectric liquid crystals with three ring molecular core

“…It allows to control other parameters important for applications, that is helical parameters. The limited number of antiferroelectric mixtures with long helical pitch [8,[11][12][13][14] as well as continuous development of new fields of application of liquid crystal materials [15][16][17][18] make the formulation of new antiferroelectric mixtures with desired helical parameters a very important action.…”