New Orthoconic Antiferroelectrics Useful for Applications

Electro-optic and dielectric investigations of a perfluorinated compound showing orthoconic antiferroelectric liquid crystal

“…So the molecules possess high tilt and higher order. It closely corresponds to the results earlier reported by other researchers [1][2][3][4][5][6][7][8]. This is one of the most important physical advantages over normal AFLC.…”

“…It was already reported by several research groups including us that the perfect dark state problem which already existed in AFLCs instead for having several advantages such as tristate switching capability, easy dc compensation, microsecond response, hemispherical viewing angle (in-plane switching geometry), intrinsic log gray-scale capability and no ghost effect, can be removed by using OAFLC having tilt angle at approximately 45° [1][2][3][4][5][6][7][8]. Because of this the importance of research in high tilted AFLC has made a significant advancement in recent times.…”

“…High tilted OAFLCs (orthoconic antiferroelectric liquid crystals) are very important because of its director tilt, θ=±45°that is helpful to solve the static dark state problem. Since the tilts of the molecules in adjacent layers of antiferroelectric smectic C phase (SmC A *) are oppositely directed so their net polarization [1][2][3][4][5][6][7][8] becomes close to zero. In antiferroelectric SmC A * phase, two relaxation modes can be expected; one with a lower frequency region in the order of a few Hz and the other with a higher frequency region.…”

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

“…[11,13] Different structures, also those containing an alkanoyloxyalkoxy terminal chain with fluorinated unit C n F 2n+1 COO-were received and reviewed earlier. [14] Recently, the high tilted antiferroelectric phase was found in compounds with a partially fluorinated alkoxyalkoxy chain. [15] They are more chemically stable and have a longer helical pitch than those compounds with an alkanoyloxyalkoxy group, later also compounds and mixtures with long pitch were found.…”

The influence of antiferroelectric compounds on helical pitch of orthoconic W-1000 mixture

“…The synthesis of compounds used for formulation of mixture W-1000 and used as dopants (A-F) has been described in Refs [11,12]. The phase transition temperatures, helical pitch and helical twist sense of mixture W-1000 doped with compounds A-F were measured.…”