Self organization of inorganic nanocrystals: Unexpected chemical and physical properties

[Display omitted] ► The shape of clusters is retained at various scales. ► Intermediary structures observed at mesoscopic scale. ► Nanocrystal stabilities due to their ordering on 2D superlattices. ► Analogy between nanocrystals in a supracrystal and atoms in a nanocrystal. Here we point out that th...

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Bibliographic Details
Published in:Journal of colloid and interface science 2012-12, Vol.388 (1), p.1-8
Main Author: Pileni, M.P.
Format: Article
Language:English
Subjects:
Analogies
Chemistry
Colloidal crystals
Colloids
Crystallinities
Crystals
Exact sciences and technology
General and physical chemistry
Inorganic Chemicals - chemistry
Magnetic properties
Micrometers
Nanocrystals
Nanomaterials
Nanoparticles - chemistry
Nanostructures - chemistry
Physical properties
Self-assemblies
Surface Properties
Three dimensional
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Summary:[Display omitted] ► The shape of clusters is retained at various scales. ► Intermediary structures observed at mesoscopic scale. ► Nanocrystal stabilities due to their ordering on 2D superlattices. ► Analogy between nanocrystals in a supracrystal and atoms in a nanocrystal. Here we point out that the nanocrystals well ordered in compact hexagonal networks are highly stable compared to the same nanocrystals either isolated on a substrate or ordered in a less compact manner. The emergence of unexpected collective physical intrinsic properties results in the nanocrystals being ordered over a long distance in colloidal crystals called supracrystals. Some morphologies of nanocrystals ordered, at the micrometer scale, in 3D superlattices called supracrystals are similar to those obtained with atoms in nanocrystals. From a comparison between vibrational and magnetic properties of supracrystals and aggregates composed of the same nanocrystals, it is proposed that nanocrystals in a supracrystal could behave as atoms in a nanocrystal. From these data a possible analogy between nanocrystals in a supracrystal and atoms in nanocrystals is proposed.
ISSN:0021-9797
1095-7103
DOI:10.1016/j.jcis.2012.07.086