Postscript

Neal, Frank

doi:10.1057/9780230372658_10

Cited by 2 publications

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“…Finally, we note that for instance particles with a electric quadrupole are known to form smectic S C phases, in which the directorn n n is tilted with respect to the normal of the smectic layers (see, e.g., Ref. [66]). Such kind of liquid crystals are of particular interest for technological applications such as fast electro-optic displays, because those materials can be ferroelectric [67].…”

Section: Dependence On the Location Of The Chargesmentioning

confidence: 96%

Smectic phases in ionic liquid crystals

Bartsch

Bier

Dietrich

2017

J. Phys.: Condens. Matter

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Ionic liquid crystals (ILCs) are anisotropic mesogenic molecules which carry charges and therefore combine properties of liquid crystals, e.g. the formation of mesophases, and of ionic liquids, such as low melting temperatures and tiny triple-point pressures. Previous density functional calculations have revealed that the phase behavior of ILCs is strongly affected by their molecular properties, i.e. their aspect ratio, the loci of the charges, and their interaction strengths. Here, we report new findings concerning the phase behavior of ILCs as obtained by density functional theory and Monte Carlo simulations. The most important result is the occurrence of a novel, wide smectic-A phase [Formula: see text], at low temperature, the layer spacing of which is larger than that of the ordinary high-temperature smectic-A phase [Formula: see text]. Unlike the ordinary smectic S phase, the structure of the [Formula: see text] phase consists of alternating layers of particles oriented parallel to the layer normal and oriented perpendicular to it.

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Section: Dependence On the Location Of The Chargesmentioning

confidence: 96%

Smectic phases in ionic liquid crystals

Bartsch

Bier

Dietrich

2017

J. Phys.: Condens. Matter

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“…Most of the predictions on the origin of biaxial phases has been based on biaxially shaped particles [2,5,8] or biaxially interacting particles [6,7,9]. An uniaxial model of central quadrupolar Gay-Berne (GB) molecules exhibited a tilted smectic phase for a particular value of the quadrapole moment [10]. However, the phase disappeared for other lower or higher values of the quadrapole moments.…”

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confidence: 99%

Monte Carlo simulations of biaxial ordering in systems of uniaxially interacting rodlike ellipsoids

Bose

2018

Phys. Rev. E

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The minimal ingredient to generate a biaxial liquid crystalline ordering is usually considered to be the strongly biaxial interactions breaking the cylindrical symmetry of the uniaxial molecules. Although there is no fundamental reason to forbid a biaxial ordering of pure uniaxial origin, it has been a long standing problem to find a robust demonstration of such phenomenon in systems of rod-like particles. We report here off-lattice Monte Carlo simulations of some new model systems of polar achiral rodlike ellipsoids which spontaneously exhibit novel biaxial smectic phases of pure uniaxial origin. We show that dipolar interactions can generate different biaxial phases of pure uniaxial origin in systems of cylindrically symmetric Gay-Berne ellipsoids for an wide variety of length-to-width ratios. The systems of ellipsoids with low length-to-width ratios exhibit highly tilted biaxial smectic phases in the presence of central axial dipoles. In case of ellipsoids having high length-to-width ratio, the generation of a biaxial phase requires the presence of two parallel axial terminal dipoles. In addition, the phases also exhibit fascinating ferroelectric or striped ordering of the dipolar ellipsoids.

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Postscript

Cited by 2 publications

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Smectic phases in ionic liquid crystals

Smectic phases in ionic liquid crystals

Monte Carlo simulations of biaxial ordering in systems of uniaxially interacting rodlike ellipsoids

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