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Tschierske, Carsten

doi:10.1039/b102914m

Cited by 478 publications

(280 citation statements)

References 199 publications

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“…Interesting examples include dendrimers, where a central dendritic core has been functionalised by a flexible chain and a terminal mesogenic group [9,10], multipedal mesogens containing a central octasilsesquioxane core [11] and fullerene containing liquid crystals [12,13]. Some of the recent exciting work in this area has been summarised in a number of excellent review articles [14][15][16][17][18][19], which draw parallels between polyphilic thermotropic liquid crystals, block copolymers and self-assembly in amphiphilic and biological systems.…”

Section: Introductionmentioning

confidence: 99%

Simulation of bulk phases formed by polyphilic liquid crystal dendrimers

Ilnytskyi¹,

Lintuvuori²,

Wilson³

2010

Condens. Matter Phys.

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A coarse-grained simulation model for a third generation liquid crystalline dendrimer (LCDr) is presented. It allows, for the first time, for a successful molecular simulation study of a relation between the shape of a polyphilic macromolecular mesogen and the symmetry of a macroscopic phase. The model dendrimer consists of a soft central sphere and 32 grafted chains each terminated by a mesogen group. The mesogenic pair interactions are modelled by the recently proposed soft core spherocylinder model of Lintuvuori and Wilson [J. Chem. Phys, 128, 044906, (2008)]. Coarse-grained (CG) molecular dynamics (MD) simulations are performed on a melt of 100 molecules in the anisotropic-isobaric ensemble. The model LCDr shows conformational bistability, with both rod-like and disc-like conformations stable at lower temperatures. Each conformation can be induced by an external aligning field of appropriate symmetry that acts on the mesogens (uniaxial for rod-like and planar for disc-like), leading to formation of a monodomain smectic A (Sm A ) or a columnar (Col) phase, respectively. Both phases are stable for approximately the same temperature range and both exhibit a sharp transition to an isotropic cubic-like phase upon heating. We observe a very strong coupling between the conformation of the LCDr and the symmetry of a bulk phase, as suggested previously by theory. The study reveals rich potential in terms of the application of this form of CG modelling to the study of molecular self-assembly of liquid crystalline macromolecules.

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Section: Introductionmentioning

confidence: 99%

Simulation of bulk phases formed by polyphilic liquid crystal dendrimers

Ilnytskyi¹,

Lintuvuori²,

Wilson³

2010

Condens. Matter Phys.

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“…Self-organization of simple organic components into more complex structures is one of the most scientifically exciting and technologically promising fields of research today [1,2]. One dimensional structures such as fibers, two dimensional (2D) structures such as membranes, and three dimensional (3D) structures such as columnar phases may be created from simpler structural units.…”

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confidence: 99%

Twist Elasticity and Anchoring in a Lamellar Nematic Phase

et al. 2004

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Electrooptic measurements were performed on a lamellar nematic phase in which the mesogenic moieties lie in lamellae that are separated by partially perfluorinated side groups. The twist elastic constant K 22 and the quadratic and quartic anchoring strength coefficients are reported. K 22 is found to be considerably smaller than that of typical three-dimensional nematics, a consequence of the greatly weakened interactions between the spatially separated lamellae.

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“…10a,23 In the case of these hexacatenar complexes, the symmetric distribution of the terminal chains precludes the same tilting mechanism, but with the two additional chains, the chain/core volume mismatch is very much greater and columnar phases form directly. 24 The 2D hexagonal symmetry of the columnar mesophases was characterised unambiguously by XRD for complexes 2c-e and 3c-e, with similar parameters for identical chain lengths. However, the mesophases exist at different temperatures and with different temperature ranges, suggesting some influence of the metal (Table 1).…”

Section: Discussionmentioning

confidence: 97%

Hexacatenar liquid-crystalline complexes of palladium(ii) and platinum(ii) based on trialkoxystilbazole esters

et al. 2002

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The synthesis and characterisation of 4-(3',4',5'-trialkoxybenzoyloxy)pyridines (1a-e), and of their corresponding palladium(II), (2a-e), and platinum(II), (3a-e), complexes are described. The pyridine-based ligands are not mesomorphic, but upon complexation to PdCl 2 or PtCl 2 , new hexacatenar mesogens are formed which show exclusively the hexagonal columnar mesophase. The mesomorphic behaviour of the complexes was characterised by polarised optical microscopy, differential scanning calorimetry and X-ray diffraction. The metal seems to influence the crystal phase and mesophase stability as well as the mesomorphic temperature range.

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Cited by 478 publications

References 199 publications

Simulation of bulk phases formed by polyphilic liquid crystal dendrimers

Simulation of bulk phases formed by polyphilic liquid crystal dendrimers

Twist Elasticity and Anchoring in a Lamellar Nematic Phase

Hexacatenar liquid-crystalline complexes of palladium(ii) and platinum(ii) based on trialkoxystilbazole esters

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