Intrinsic Focusing of the Particle Size Distribution in Colloids Containing Nanocrystals of Two Different Crystal Phases

Autor(en): Voss, Benjamin
Haase, Markus 
Stichwörter: Chemistry; Chemistry, Multidisciplinary; Chemistry, Physical; CONVERSION; EVOLUTION; FLUORIDE NANOCRYSTALS; GROWTH; II-VI; KINETICS; Materials Science; Materials Science, Multidisciplinary; MECHANISM; nanoparticle growth; NANOPARTICLES; Nanoscience & Nanotechnology; NUCLEATION; Ostwald ripening; Ostwald's step rule; QUANTUM-DOT; Science & Technology - Other Topics; upconversion
Erscheinungsdatum: 2013
Journal: ACS NANO
Volumen: 7
Ausgabe: 12
Startseite: 11242
Seitenende: 11254
We have studied the Ostwald ripening of colloids containing nanocrystals of two different crystal phases of the same material. Ostwald ripening in such polymorphic systems is shown to result in an intrinsic focusing of the particle size distribution of the thermodynamically preferred phase while the particles of the less stable phase completely dissolve. Experimentally, a colloidal system of this kind was realized by mixing small NaEuF4 nanocrystals of the cubic alpha-phase with particles of the hexagonal beta-phase having the same mean size and size distribution. The temporal evolution of the particle sizes of both phases can be understood and numerically simulated within the framework of LSW theory. The simulations show that small differences in the bulk solubility or the surface energy of the two phases are sufficient to explain the experimentally observed narrowing of the particle size distribution.
ISSN: 19360851
DOI: 10.1021/nn405026w

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