Article (Scientific journals)
Ostwald ripening of confined nanoparticles: chemomechanical coupling in nanopores
Gommes, Cédric
2019In Nanoscale, 11, p. 7386
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Keywords :
Ostwald ripening; Functional nanomaterials; porous materials
Abstract :
[en] Ostwald ripening is a major source of deactivation of functional nanomaterials. It consists in the growth of large nanoparticles at the expense of smaller ones via the formation and decomposition of intermediate chemical species. In most materials of practical interest nanoparticles are dispersed in porous supports with which they interact mechanically. We analyze the consequences of this chemo-mechanical coupling on both kinetic and equilibrium aspects of Ostwald ripening. We show that the long-term stability of a collection of confined nanoparticles depends on nucleation-like events, whereby few particles break through the pore walls early in the process and later grow at the expense of all other particles. This notably explains why the stability of confined nanoparticles depends critically on their initial size distribution; it also provides an explanation for the occasional observation of bimodal particle size distributions in aged materials.
Disciplines :
Chemistry
Materials science & engineering
Physics
Author, co-author :
Gommes, Cédric  ;  Université de Liège - ULiège > Department of Chemical Engineering > Department of Chemical Engineering
Language :
English
Title :
Ostwald ripening of confined nanoparticles: chemomechanical coupling in nanopores
Publication date :
2019
Journal title :
Nanoscale
ISSN :
2040-3364
eISSN :
2040-3372
Publisher :
Royal Society of Chemistry, United Kingdom
Volume :
11
Pages :
7386
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
Fédération Wallonie Bruxelles. Fonds de la Recherche Scientifique - F.R.S.-FNRS
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since 16 April 2019

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