Effect of fluorination on the phase sequence, dielectric and electro-optical properties of ferroelectric and antiferroelectric mixtures

Effect of non-mesogenic chiral terphenylate on the formulation of room temperature ferroelectric liquid crystal mixtures suitable for display applications

“…Typical domain texture was observed in SmC* phase which transformed into a uniform planar aligned texture in SmA* phase to a usual long pitch cholesteric droplets texture in N* phase before going to isotropic phase [15]. It might be mentioned here that when four fluorinated chiral dopants differing only in number and location of fluorine atoms in the molecular rigid core were doped (60 wt% of each) in the same host mixture (HM) they produced two ferroelectric and two antiferroelectric liquid crystal mixtures [16,17]. Not only that, one of the dopant at lower concentration (10 wt%) produced an electroclinic mixture with large field-induced tilt and very small layer contraction [18] and at much higher concentration (75 wt%), it formed a wide range ferroelectric mixture with a few hundred micro-second switching time [19].…”

The Influence of the Molecular Structure of Compounds on Their Properties and the Occurrence of Chiral Smectic Phases

“…The ferroelectric phase (SmC*) was predicted and then discovered by Meyer et al in 1975 [13], and antiferroelectricity in liquid crystals was discovered by Chandani et al in 1989 [14]. Practical applications have only liquid-crystalline mixtures [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30] because the composition's tuning allows us to make the optimized ferro-or antiferroelectric mixtures. It is not easy to synthesize compounds with the desired properties.…”

Properties of Antiferroelectric Mixtures Differing in the Amount of Added Racemate

“…The first publications on high-tilted compounds with the antiferroelectric phase appeared in the 1990s; a tilt angle of Θ ≈ 40° was detected in siloxane liquid crystalline compounds. The first orthoconics with antiferroelectric properties that were not dimers of two compounds were In many applications, liquid crystalline mixtures are used because single compounds are insufficient to obtain the desired properties [12][13][14][15][16][17][18][19][20][21][22][23][24][25][26]. It has been shown that the properties of their binary mixtures can be predicted by using mixtures of two liquid crystalline materials with the ferroelectric phase with previously known properties, such as viscoelastic properties [27,28].…”