Polar Columnar and Tetrahedratic Phases

Pleiner, Harald; Brand, Helmut R.; Cladis, P. E.

doi:10.1080/15421400390213285

Cited by 6 publications

(1 citation statement)

References 14 publications

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“…Many have considered hexagonal columnar liquid crystals, whose polarization is parallel to the columnar axis, as an appropriate supramolecular design for achieving intrinsic ferroelectricity. Interestingly, in hexagonally packed columnar phases, the triangular lattice of polar columns is asymmetric and has antiparallel packing, which ensures a stable, macroscopic polarization 80,81 . This polar order has been observed numerous times for bowl-shaped mesogens 82,83 .…”

Section: Organization Of Molecular Dipolesmentioning

confidence: 99%

Supramolecular ferroelectrics

et al. 2015

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Supramolecular chemistry uses non-covalent interactions to coax molecules into forming ordered assemblies. The construction of ordered materials with these reversible bonds has led to dramatic innovations in organic electronics, polymer science and biomaterials. Here, we review how supramolecular strategies can advance the burgeoning field of organic ferroelectricity. Ferroelectrics - materials with a spontaneous and electrically reversible polarization - are touted for use in non-volatile computer memories, sensors and optics. Historically, this physical phenomenon has been studied in inorganic materials, although some organic examples are known and strong interest exists to extend the search for ferroelectric molecular systems. Other undiscovered applications outside this regime could also emerge. We describe the key features necessary for molecular and supramolecular dipoles in organic ferroelectrics and their incorporation into ordered systems, such as porous frameworks and liquid crystals. The goal of this Review is to motivate the development of innovative supramolecular ferroelectrics that exceed the performance and usefulness of known systems.

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Section: Organization Of Molecular Dipolesmentioning

confidence: 99%

Supramolecular ferroelectrics

et al. 2015

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S. Chandrasekhar (1930–2004): Discotische Flüssigkristalle

Cladis

Ratna

Shashidar³

2004

Angewandte Chemie

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Polarisation auf der Mesoskala durch geometrische Frustration in kolumnaren supramolekularen Kristallen

Zehe

Hill²,

Funnell

et al. 2017

Angewandte Chemie

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Kolumnare supramolekulare Phasen, die eine Polarisation entlang der Kolumnenachse aufweisen, haben das Potential zur Entwicklung von Datenspeichern mit ultrahoher Dichte, da jede einzelne Kolumne als Speicherelement fungieren kann. Wir zeigen anhand von Untersuchungen der Struktur und Unordnung von vier kolumnaren 1,3,5-Benzoltrisamiden mittels totaler Rçntgenstreuung und DFT-Rechnungen, dass die Kolumnenorientierung und damit das kolumnare Dipolmoment empfindlich auf geometrische Frustration ist, sofern die Kolumnen in hexagonalen Stabpackungen aggregieren. Die Frustration unterdrückt die konventionelle antiferroelektrische Ordnung und erhçht die Sensitivität für kollektive interkolumnare Packungseffekte. Dieser Befund erlaubt es, Domänen auf der Mesoskala zu erzeugen, die eine spontane Polarisation aufweisen. Unsere Ergebnisse zeigen auf, wie das komplexe Zusammenspiel von sterischen und elektrostatischen Wechselwirkungen durch ein einfaches Design der molekularen Synthone beeinflusst wird, um spontane Polarisation zu erzeugen und die Grçße der mesoskopischen Domänen einzustellen.

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Polar Columnar and Tetrahedratic Phases

Cited by 6 publications

References 14 publications

Supramolecular ferroelectrics

Supramolecular ferroelectrics

S. Chandrasekhar (1930–2004): Discotische Flüssigkristalle

Polarisation auf der Mesoskala durch geometrische Frustration in kolumnaren supramolekularen Kristallen

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