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- Quasi-crystals_(supramolecular) abstract "Quasi-crystals are supramolecular aggregates exhibiting both crystalline (solid) properties as well as amorphous, liquid-like properties.Self-organized structures termed \"quasi-crystals\" were originally described in 1978 by the Israeli scientist Valeri A. Krongauz of the Weizmann Institute of Science, in the Nature paper, Quasi-crystals from irradiated photochromic dyes in an applied electric field. In his 1978 paper Krongauz coined the term “Quasi-Crystals” for the new self-organized colloidal particles . The Quasi-crystals are supramolecular aggregates manifesting both crystalline properties e.g. Bragg scattering, as well as amorphous, liquid-like properties i.e. drop-like shapes, fluidity, extensibility and elasticity in electric field. The supramolecular Quasi-crystals are produced in photochemical reaction by exposing solutions of photochromic spiropyran molecules to UV radiation. The ultraviolet light induces the conversion of the spiropyrans to merocyanine molecules that manifest electric dipole moments. (see Scheme 1). The quasi-crystals have external shape of submicron globules and their internal structure consists of crystals enveloped by an amorphous matter(see Fig. 1).The crystals are formed by self-assembled stacks of the merocyanine molecular dipoles aligningthemselves in a parallel manner, while amorphous envelopes consist of thesame merocyanine dipoles aligned in an anti-parallel manner (Fig.1,Scheme2). In an applied electrostatic field, quasi-crystals form macroscopicthreads that show linear optical dichroism.Later Krongauz described unusual phase transitions of molecules composedof mesogenic and spiropyran moieties, which he named \"quasi-liquidcrystals.\" A micrograph of their mesophase appeared on the cover of Nature in a 1984 paper, “Quasi-Liquid Crystals.” The investigation of spiropyran-merocyanineself-organized systems, including macromolecules (see, for example, Fig. 2),has continued over the years.These studies have resulted in discoveries ofunusual and practically significant phenomena. Thus, in the electrostatic field, quasi-crystals andquasi-liquid crystals have exhibited 2nd order non-linear opticalproperties.Potential applications of these fascinating materials have been described and patented.Work on spiropyran-merocyanineself-assemblies currently continues in several laboratories –see, for example,reference [18] and the references cited in that study.".
- Quasi-crystals_(supramolecular) thumbnail Formation_of_merocyanine_dipoles_upon_irradiation.jpg?width=300.
- Quasi-crystals_(supramolecular) wikiPageID "42628804".
- Quasi-crystals_(supramolecular) wikiPageLength "10209".
- Quasi-crystals_(supramolecular) wikiPageOutDegree "22".
- Quasi-crystals_(supramolecular) wikiPageRevisionID "681390615".
- Quasi-crystals_(supramolecular) wikiPageWikiLink Amorphous_solid.
- Quasi-crystals_(supramolecular) wikiPageWikiLink Braggs_law.
- Quasi-crystals_(supramolecular) wikiPageWikiLink Category:Condensed_matter_physics.
- Quasi-crystals_(supramolecular) wikiPageWikiLink Category:Liquid_crystals.
- Quasi-crystals_(supramolecular) wikiPageWikiLink Category:Self-organization.
- Quasi-crystals_(supramolecular) wikiPageWikiLink Category:Supramolecular_chemistry.
- Quasi-crystals_(supramolecular) wikiPageWikiLink Crystallinity.
- Quasi-crystals_(supramolecular) wikiPageWikiLink Dichroism.
- Quasi-crystals_(supramolecular) wikiPageWikiLink Electric_dipole_moment.
- Quasi-crystals_(supramolecular) wikiPageWikiLink Liquid_crystal.
- Quasi-crystals_(supramolecular) wikiPageWikiLink Merocyanine.
- Quasi-crystals_(supramolecular) wikiPageWikiLink Mesogen.
- Quasi-crystals_(supramolecular) wikiPageWikiLink Molecular_self-assembly.
- Quasi-crystals_(supramolecular) wikiPageWikiLink Nature_(journal).
- Quasi-crystals_(supramolecular) wikiPageWikiLink Self-assembled.
- Quasi-crystals_(supramolecular) wikiPageWikiLink Self-organization.
- Quasi-crystals_(supramolecular) wikiPageWikiLink Spiropyran.
- Quasi-crystals_(supramolecular) wikiPageWikiLink Supramolecular_chemistry.
- Quasi-crystals_(supramolecular) wikiPageWikiLink Valeri_A._Krongauz.
- Quasi-crystals_(supramolecular) wikiPageWikiLink Weizmann_Institute_of_Science.
- Quasi-crystals_(supramolecular) wikiPageWikiLink File:Formation_of_merocyanine_dipoles_upon_irradiation.jpg.
- Quasi-crystals_(supramolecular) wikiPageWikiLink File:Quasicrystals_Fig-2.jpg.
- Quasi-crystals_(supramolecular) wikiPageWikiLinkText "quasicrystals".
- Quasi-crystals_(supramolecular) wikiPageUsesTemplate Template:Distinguish.
- Quasi-crystals_(supramolecular) wikiPageUsesTemplate Template:Reflist.
- Quasi-crystals_(supramolecular) wikiPageUsesTemplate Template:Technical.
- Quasi-crystals_(supramolecular) subject Category:Condensed_matter_physics.
- Quasi-crystals_(supramolecular) subject Category:Liquid_crystals.
- Quasi-crystals_(supramolecular) subject Category:Self-organization.
- Quasi-crystals_(supramolecular) subject Category:Supramolecular_chemistry.
- Quasi-crystals_(supramolecular) hypernym Aggregates.
- Quasi-crystals_(supramolecular) type Thing.
- Quasi-crystals_(supramolecular) comment "Quasi-crystals are supramolecular aggregates exhibiting both crystalline (solid) properties as well as amorphous, liquid-like properties.Self-organized structures termed \"quasi-crystals\" were originally described in 1978 by the Israeli scientist Valeri A. Krongauz of the Weizmann Institute of Science, in the Nature paper, Quasi-crystals from irradiated photochromic dyes in an applied electric field.".
- Quasi-crystals_(supramolecular) label "Quasi-crystals (supramolecular)".
- Quasi-crystals_(supramolecular) differentFrom Quasicrystal.
- Quasi-crystals_(supramolecular) sameAs Q17014699.
- Quasi-crystals_(supramolecular) sameAs m.010gqv1t.
- Quasi-crystals_(supramolecular) sameAs Q17014699.
- Quasi-crystals_(supramolecular) wasDerivedFrom Quasi-crystals_(supramolecular)?oldid=681390615.
- Quasi-crystals_(supramolecular) depiction Formation_of_merocyanine_dipoles_upon_irradiation.jpg.
- Quasi-crystals_(supramolecular) isPrimaryTopicOf Quasi-crystals_(supramolecular).