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Crystals 2018, 8(7), 275;

Quasicrystalline Ordering in Thin Liquid Crystal Films

School of Natural Sciences, Mahindra Ecole Centrale, Hyderabad 500043, India
Faculty of Mathematics and Physics, University of Ljubljana, 1000 Ljubljana, Slovenia
Josef Stefan Institute, 1000 Ljubljana, Slovenia
These authors contributed equally to this work.
Author to whom correspondence should be addressed.
Received: 31 March 2018 / Revised: 21 June 2018 / Accepted: 25 June 2018 / Published: 29 June 2018
(This article belongs to the Special Issue Structure and Properties of Quasicrystalline Materials)
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Quasicrystalline ordering was first observed in synthetic multi-component metallic alloys. These solid state materials exhibit quasicrystalline atomic ordering at nanometer length scales. Softmatter systems are another class of versatile materials that can exhibit quasicrystalline ordering across supra-nanometer (>10 nm) to supra-micrometer (>10 μm) length scales as recently observed in materials like-supramolecular dendritic molecules, ABC star polymers, binary nanoparticle systems and block co-polymers in condensed matter systems. The underlying mechanism in most of these soft quasicrystals seems to be the presence of two or more length scales in the system. Another class of development in self-assembled quasicrystals in softmatter is being observed in low molecular weight chiral and achiral nematic liquid crystals. Liquid crystal forms an efficient matrix for self- and directed-assemblies of colloidal structures where surface and geometry-tuning the particles in nematic liquid crystals gives rise to complex inter-particle interactions while the long-range order results in self-assembled structures of higher order rotational symmetries. Furthermore, there has also been attempts to generate colloidal quasicrystalline defect structures by directing the assemblies using multiple and single beam lasing techniques. In the present article, we will review self- and assisted-assembly of quasicrystalline structures in nematic liquid crystals (both chiral and achiral) and discuss the underlying mechanisms. View Full-Text
Keywords: liquid crystals; nematic; cholesteric; quasi crystals; self-assembly; topological defects; colloids; optical manipulation liquid crystals; nematic; cholesteric; quasi crystals; self-assembly; topological defects; colloids; optical manipulation

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Dontabhaktuni, J.; Ravnik, M.; Zumer, S. Quasicrystalline Ordering in Thin Liquid Crystal Films. Crystals 2018, 8, 275.

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