Two‐ and Three‐Dimensional Liquid‐Crystal Phases from Axial Bundles of Rodlike Polyphiles: Segmented Cylinders, Crossed Columns, and Ribbons between Sheets

Liu, Feng; Prehm, Marko; Zeng, Xiangbing; Ungar, Goran; Tschierske, Carsten

doi:10.1002/anie.201103303

Cited by 29 publications

(16 citation statements)

References 24 publications

(24 reference statements)

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“…The low K 3 of the discotic or polycatenar columnar phases is attributed to the long dimension of their mesogens (disks, fans, polycatenar rods) being normal to the columns. The recently reported axial bundle columnar phase, in which rod-like mesogens lie parallel to the column axis, 30,31 also shows the typical columnar ''spherulites''. However, the rods in that structure aggregate in thin bundles in the column core, separated by regions of flexible alkyl chains, hence their K 3 is also expected to be low.…”

Section: Resultsmentioning

confidence: 85%

Control of anisotropic self-assembly of gold nanoparticles coated with mesogens

et al. 2012

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Section: Resultsmentioning

confidence: 85%

Control of anisotropic self-assembly of gold nanoparticles coated with mesogens

et al. 2012

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“…In the rod-bundle phases, the aromatic cores and the polar end groups are segregated, leading to a periodicity along the columns. These modulated columns can lock into register with each other with or without a defined longitudinal shift on a rhombohedral (R3m) or hexagonal (P6/ mmm) three-dimensional lattice, respectively [57,59].…”

Section: Linear and Branched Axial Rod-bundle Phasesmentioning

confidence: 99%

Complex tiling patterns in liquid crystals

et al. 2011

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In this account recent progress in enhancing the complexity of liquid crystal self-assembly is highlighted. The discussed superstructures are formed mainly by polyphilic T-shaped and X-shaped molecules composed of a rod-like core, tethered with glycerol units at both ends and flexible non-polar chain(s) in lateral position, but also related inverted molecular structures are considered. A series of honeycomb phases composed of polygonal cylinders ranging from triangular to hexagonal, followed by giant cylinder honeycombs is observed for ternary T-shaped polyphiles on increasing the size of the lateral chain(s). Increasing the chain size further leads to new modes of lamellar organization followed by three-dimensional and two-dimensional structures incorporating branched and non-branched axial rod-bundles. Grafting incompatible chains to opposite sides of the rod-like core leads to quaternary X-shaped polyphiles. These form liquid crystalline honeycombs where different cells are filled with different material. Projected on an Euclidian plane, all honeycomb phases can be described either by uniformly coloured Archimedean and Laves tiling patterns (T-shaped polyphiles) or as multi-colour tiling patterns (X-shaped polyphiles). It is shown that geometric frustration, combined with the tendency to segregate incompatible chains into different compartments and the need to find a periodic tiling pattern, leads to a significant increase in the complexity of soft self-assembly. Mixing of different chains greatly enhances the number of possible 'colours' and in this way, periodic structures comprising up to seven distinct compartments can be generated. Relations to biological self-assembly are discussed shortly.

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“…5,13 However, it actually remains unclear whether the supramolecular column is composed of a single-chain or a bundle of chains, which is a critical character of the Φ structure. 6,14 While a single-chain column is mostly accepted as the building block of the Φ phase, multi-chain column has also been suggested in some cases. In the supramolecular system of rodlike bolaamphiphiles with lateral swallow-tailed chains, axialbundle Φ phases are formed by bundles of several parallel rods.…”

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Self-Organized Columnar Phase of Side-Chain Liquid Crystalline Polymers: To Precisely Control the Number of Chains Bundled in a Supramolecular Column

et al. 2014

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Self-organization of liquid crystalline (LC) polyacetylene derivatives (PAs) bearing hemiphasmid side-chains was investigated. The synthesized PAs can form smectic and columnar phases, depending on the constitutions of side chains. With a nanosegregation structure, the columnar phase of PAs takes a bundle of chains as its building block, of which the chain number is precisely determined by the volume fraction of the rigid component in PAs. The “precise multi-chain column” can be understood using a mean field theory, from which the deduced number of chains in the supramolecular column agrees well with the experimental result. This study reveals that the volume fraction of the rigid component plays a significant role in the self-organization of side-chain LC polymers, which is valuable for the rational design of macromolecules with precisely ordered structures.

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Two‐ and Three‐Dimensional Liquid‐Crystal Phases from Axial Bundles of Rodlike Polyphiles: Segmented Cylinders, Crossed Columns, and Ribbons between Sheets

Cited by 29 publications

References 24 publications

Control of anisotropic self-assembly of gold nanoparticles coated with mesogens

Control of anisotropic self-assembly of gold nanoparticles coated with mesogens

Complex tiling patterns in liquid crystals

Self-Organized Columnar Phase of Side-Chain Liquid Crystalline Polymers: To Precisely Control the Number of Chains Bundled in a Supramolecular Column

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