Document Detail


Anomalous dependence of particle size on supersaturation in the preparation of iron nanoparticles from iron pentacarbonyl.
MedLine Citation:
PMID:  22921409     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Iron nanoparticles were prepared by decomposing iron pentacarbonyl (Fe(CO)(5)) at 170-220°C in the presence of amine surfactant and alkane solvent and under 1-12bar carbon monoxide (CO) pressure. It was found that the amine not only acted as a stabilizer for the growing particles but also had a critical role as a promotor in the decomposition reaction. Relatively small changes in the CO pressure had anomalous effects on the particle size distribution. Typically, monodisperse particles were obtained at 1bar, while pressures in the 2-6bar range led to wider and even bimodal size distributions due to an emergence of smaller particles. At still higher pressures, the larger particle size disappeared leaving the distribution monodisperse again. The CO pressure, at which the bimodal transition took place, increased with the reaction temperature. Polycrystalline particles were formed at lower pressures and monocrystalline particles at higher pressures. This indicates that increased CO pressure inhibits aggregation.
Authors:
Maija Huuppola; Zhen Zhu; Leena-Sisko Johansson; Kyösti Kontturi; Kari Laasonen; Christoffer Johans
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-7-31
Journal Detail:
Title:  Journal of colloid and interface science     Volume:  -     ISSN:  1095-7103     ISO Abbreviation:  J Colloid Interface Sci     Publication Date:  2012 Jul 
Date Detail:
Created Date:  2012-8-27     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0043125     Medline TA:  J Colloid Interface Sci     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2012 Elsevier Inc. All rights reserved.
Affiliation:
Department of Chemistry, Aalto University, FI-00076 Aalto, Finland.
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