Melting, freezing, and coalescence of gold nanoclusters
نویسندگان
چکیده
منابع مشابه
Melting of icosahedral gold nanoclusters from molecular dynamics simulations.
Molecular dynamics simulations show that gold clusters with about 600-3000 atoms crystallize into a Mackay icosahedron upon cooling from the liquid. A detailed surface analysis shows that the facets on the surface of the Mackay icosahedral gold clusters soften but do not premelt below the bulk melting temperature. This softening is found to be due to the increasing mobility of vertex and edge a...
متن کاملThermodynamics of freezing and melting
Although the freezing of liquids and melting of crystals are fundamental for many areas of the sciences, even simple properties like the temperature-pressure relation along the melting line cannot be predicted today. Here we present a theory in which properties of the coexisting crystal and liquid phases at a single thermodynamic state point provide the basis for calculating the pressure, densi...
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When attempts are made to interpret the solid-liquid transition in terms of molecular structure, highly significant information can emerge from phemomena of pre-melting and pre-freezing. Empirically, on approaching the transition between solid and liquid, characteristic parameters of the phase under examination may show an accelerated rate of change, in the sense of a premonition of the change ...
متن کاملFormation of an icosahedral structure during the freezing of gold nanoclusters: surface-induced mechanism.
The freezing behavior of gold nanoclusters was studied by employing molecular dynamics simulations based on the semiempirical embedded-atom method. Investigations of the gold nanoclusters revealed that, just after freezing, ordered nanosurfaces with a fivefold symmetry were formed with interior atoms remaining in the disordered state. Further lowering of temperatures induced nanocrystallization...
متن کاملCoalescence Behavior of Gold Nanoparticles
The tetraoctylammonium bromide (TOAB)-stabilized gold nanoparticles have been successfully fabricated. After an annealing of the as-synthesized nanoparticles at 300 degrees C for 30 min, the coalescence behavior of gold nanoparticles has been investigated using high-resolution transmission electron microscopy in detail. Two types of coalescence, one being an ordered combination of two or more p...
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ژورنال
عنوان ژورنال: Physical Review B
سال: 1997
ISSN: 0163-1829,1095-3795
DOI: 10.1103/physrevb.56.2248