Number of the records: 1

Modelling of Reaction of Metallic Nanospheres with Gas

SYSNO ASEP	0363674
Document Type	J - Journal Article
R&D Document Type	Journal Article
Subsidiary J	Článek ve WOS
Title	Modelling of Reaction of Metallic Nanospheres with Gas
Author(s)	Fischer, F. D. (AT) Svoboda, Jiří (UFM-A)_{RID, ORCID}
Number of authors	2
Source Title	Solid State Phenomena - ISSN 1012-0394 172-174, - (2011), s. 1028-1037
Number of pages	10 s.
Language	eng - English
Country	CH - Switzerland
Keywords	bulk diffusion ; phase transformation kinetics ; oxidation
Subject RIV	BJ - Thermodynamics
R&D Projects	GAP108/10/1781 GA ČR - Czech Science Foundation (CSF)
CEZ	AV0Z20410507 - UFM-A (2005-2011)
UT WOS	000303359700160
DOI	10.4028/www.scientific.net/SSP.172-174.1028
Annotation	The stoichiometric MpXq hollow nanospheres are produced by reaction of metallic M nanospheres with the gaseous X phase. In the first stage a sufficiently thick MpXq nanoshell on the metallic core of phase M is formed. During this stage high supersaturation of vacancies in the M core or very high hydrostatic stress in the M core, due to the misfit between the core and the nanoshell, are developed and provide favourable conditions for the hollow nucleation. The misfit is caused by the Kirkendall effect. Based on the application of the thermodynamic extremal principle a kinetic model of MpXq nanoshell formation is derived. The kinetics is driven by the change of the chemical energy due to reaction of M and X components, of the interface and surface energies, and of the elastic strain energy due to misfit strain of the whole system. The model is used for simulation of the Cu2O shell growth kinetics due to oxidation of a Cu nanosphere, and the results of simulations are discussed.
Workplace	Institute of Physics of Materials
Contact	Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485
Year of Publishing	2012

Number of the records: 1