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

Abstract

The influence of six antiferroelectric compounds on the helical pitch of mixture W-1000, which was reported as long pitch orthoconic antiferroelectric liquid crystalline mixture, was checked by spectrophotometry and polarimetry methods. The electro-optical properties for the mixture with the longest pitch were measured. An improvement in electro-optical response due to the long pitch is reported. The novelty in electro-optical properties is the good symmetry response.

Design of polar self-assembling lactic acid derivatives possessing submicrometre helical pitch

“…By simply applying an electric field, it is possible to reach uniform alignment which remains very stable with time. Their most exciting property, namely the helical pitch length of 120–320 nm, makes the materials from the KL n / m series potentially applicable for the design of advanced functional multicomponent mixtures (like in [ 44 , 47 – 50 57 – 58 ]) aimed for electro-optic and photonic devices based on the deformed helix ferroelectric effect [ 5 , 41 – 44 59 ]. Further studies of similar materials are in progress and will be presented elsewhere.…”

“…By using the DHF effect, the possibility for realising specific displays, effective light shutters, voltage sensors (with exceptionally fast response and near-perfect linearity and low-cost), and tuneable telecommunication optical fibres [ 45 – 46 ] is very encouraging [ 5 , 44 ]. However, requirements for materials that perform at the DHF mode are usually very complex, which multicomponent mixtures [ 44 , 47 – 50 ] only can fulfil.…”

The effect of the octan-3-yloxy and the octan-2-yloxy chiral moieties on the mesomorphic properties of ferroelectric liquid crystals

“…The helical pitch measurements were carried out based on the selective light reection phenomenon. 59,60 The wavelength of selectively reected light was calculated by the observation of the minimum of the light transmission measured using a UV-VIS-NIR 3600 Shimadzu spectrophotometer in the range of 360-3000 nm during the cooling cycle. Cells were cooled from the isotropic phase and the temperature was controlled using the Linkam S-1700 temperature controller.…”

Synthesis, Mesomorphic Properties and Application of (R,S)-1-Methylpentyl 4′-Hydroxybiphenyl-4-carboxylate Derivatives

“…The aim of the work is to discuss the mesomorphic properties of the racemates with a widetemperature anticlinic phase and to demonstrate the advisability of using the racemates as dopants for the antiferroelectric mixtures. If so, it would be possible to extend the range of the antiferroelectric phase and thus increase the helical pitch, which is quite sensitive to doping [3,4,[22][23][24][25]. An analysis of the obtained results is presented.…”