Spontaneous chiral ordering in the nematic phase of an achiral banana-shaped compound

Pelzl, G.; Eremin, Alexey; Diele, Siegmar; Kresse, H.; Weißflog, W.

doi:10.1039/b206236d

Cited by 156 publications

(99 citation statements)

References 15 publications

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“…29,30 The good agreement between hard-core models and some experiments suggests that entropy alone can suffice to drive the formation of ordered structures. 31 High-aspect ratio molecules with a bent core 32,33 or a banana shape 34,35 assemble in an even richer set of morphologies, including biaxial nematic, 36,37 fan-shaped texture, 38 and nematic with splay-bend deformation or conical twist-bend helix. 39 From the technological viewpoint these structures are quite interesting.…”

Section: Introductionmentioning

confidence: 99%

Phase ordering of zig-zag and bow-shaped hard needles in two dimensions

Tavarone

Stark

2015

The Journal of Chemical Physics

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We perform extensive Monte Carlo simulations of a two-dimensional bent hard-needle model in both its chiral zig-zag and its achiral bow-shape configurations and present their phase diagrams. We find evidence for a variety of stable phases: isotropic, quasi-nematic, smectic-C, anti-ferromorphic smectic-A, and modulated-nematic. This last phase consists of layers formed by supramolecular arches. They create a modulation of the molecular polarity whose period is sensitively controlled by molecular geometry. We identify transition densities using correlation functions together with appropriately defined order parameters and compare them with predictions from Onsager theory. The contribution of the molecular excluded area to deviations from Onsager theory and simple liquid crystal phase morphology is discussed. We demonstrate the isotropic-quasi-nematic transition to be consistent with a Kosterlitz-Thouless disclination unbinding scenario. C 2015 AIP Publishing LLC. [http://dx

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Section: Introductionmentioning

confidence: 99%

Phase ordering of zig-zag and bow-shaped hard needles in two dimensions

Tavarone

Stark

2015

The Journal of Chemical Physics

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“…These fascinating compounds have substantially different physical properties than the molecules of the traditional calamitic materials, and have recently been a source of discoveries that are changing our view on molecular self-organization in liquid crystals [3,4,6,8,10].…”

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confidence: 99%

“…Interestingly, this classical liquid crystalline chirality should be revised for achiral bentcore (banana-shaped) liquid crystalline molecules [3,4,5,6,7,8,9,10,11]. These fascinating compounds have substantially different physical properties than the molecules of the traditional calamitic materials, and have recently been a source of discoveries that are changing our view on molecular self-organization in liquid crystals [3,4,6,8,10].…”

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confidence: 99%

Chiral symmetry breaking in bent-core liquid crystals

2009

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By molecular modeling we demonstrate that the nematic long-range order discovered in bentcore liquid crystal systems should reveal further spatially homogeneous phases. Two of them are identified as a tetrahedratic nematic (N T ) phase with D 2d symmetry and a chiral tetrahedratic nematic (N * T ) phase with D 2 symmetry. These new phases were found for a lattice model with quadrupolar and octupolar anisotropic interactions using Mean Field theory and Monte Carlo simulations. The phase diagrams exhibit tetrahedratic (T ), N T and N * T phases, in addition to ordinary isotropic (I), uniaxial nematic (N U ) and biaxial nematic (N B ) phases. To our knowledge, this is the first molecular model with spontaneous chiral symmetry breaking in non-layered systems.

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“…After that liquid crystalline phases formed by bent-core molecules were studied theoretically and experimentally from various aspects (compare, for example, refs. [7][8][9]), but reports of nematic phases formed by bent-core molecules remained scarce [10][11][12][13][14]. In parallel it was pointed out on the basis of a symmetry analysis that for biaxial nematic phases, which are fluid in three dimensions, there are several posa e-mail: brand@uni-bayreuth.de b e-mail: pleiner@mpip-mainz.mpg.de sibilities to have biaxial nematic phases with polar order [15].…”

Section: Introductionmentioning

confidence: 94%

Macroscopic behavior of polar nematic gels and elastomers

2016

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Abstract. We present the derivation of the macroscopic equations for uniaxial polar nematic gels and elastomers. We include the strain field as well as relative rotations as independent dynamic macroscopic degrees of freedom. As a consequence, special emphasis is laid on possible static and dynamic cross-couplings between these macroscopic degrees of freedom associated with the network, and the other macroscopic degrees of freedom including reorientations of the macroscopic polarization. In particular, we find static and dissipative dynamic cross-couplings between strain fields and relative rotations on one hand and the macroscopic polarization on the other that allow for new possibilities to manipulate polar nematics. To give one example each for the effects of a static and a dissipative cross-coupling: we find that a static electric field applied perpendicularly to the polar preferred direction leads to relative rotations while dynamically relative rotations can lead to transverse electric currents. In addition to a permanent network, we also consider the effect of a transient network, which is particularly important for the case of gels, melts and concentrated polymer solutions. A section on the influence of macroscopic chirality is included as well.

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Spontaneous chiral ordering in the nematic phase of an achiral banana-shaped compound

Cited by 156 publications

References 15 publications

Phase ordering of zig-zag and bow-shaped hard needles in two dimensions

Phase ordering of zig-zag and bow-shaped hard needles in two dimensions

Chiral symmetry breaking in bent-core liquid crystals

Macroscopic behavior of polar nematic gels and elastomers

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