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The impact of the confinement of reactants on the metal distribution in bimetallic nanoparticles synthesized in reverse micelles

A kinetic study on the formation of bimetallic nanoparticles in microemulsions was carried out by computer simulation. A comprehensive analysis of the resulting nanostructures was performed regarding the influence of intermicellar exchange on reactivity. The objects of this study were metals having...

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Autores principales: Tojo, Concha, González, Elena, Vila-Romeu, Nuria
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Beilstein-Institut 2014
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4222381/
https://www.ncbi.nlm.nih.gov/pubmed/25383307
http://dx.doi.org/10.3762/bjnano.5.206
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author Tojo, Concha
González, Elena
Vila-Romeu, Nuria
author_facet Tojo, Concha
González, Elena
Vila-Romeu, Nuria
author_sort Tojo, Concha
collection PubMed
description A kinetic study on the formation of bimetallic nanoparticles in microemulsions was carried out by computer simulation. A comprehensive analysis of the resulting nanostructures was performed regarding the influence of intermicellar exchange on reactivity. The objects of this study were metals having a difference in standard reduction potential of about 0.2–0.3 V. Relatively flexible microemulsions were employed and the concentration of the reactants was kept constant, while the reaction rate of each metal was monitored as a function of time using different reactant proportions. It was demonstrated that the reaction rates depend not only on the chemical reduction rate, but also on the intermicellar exchange rate. Furthermore, intermicellar exchange causes the accumulation of slower precursors inside the micelles, which favors chemical reduction. As a consequence, slower reduction rates strongly correlate with the number of reactants in this confined media. On the contrary, faster reduction rates are limited by the intermicellar exchange rate and not the number of reactants inside the micelles. As a result, different precursor proportions lead to different sequences of metal reduction, and thus the arrangement of the two metals in the nanostructure can be manipulated.
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spelling pubmed-42223812014-11-07 The impact of the confinement of reactants on the metal distribution in bimetallic nanoparticles synthesized in reverse micelles Tojo, Concha González, Elena Vila-Romeu, Nuria Beilstein J Nanotechnol Full Research Paper A kinetic study on the formation of bimetallic nanoparticles in microemulsions was carried out by computer simulation. A comprehensive analysis of the resulting nanostructures was performed regarding the influence of intermicellar exchange on reactivity. The objects of this study were metals having a difference in standard reduction potential of about 0.2–0.3 V. Relatively flexible microemulsions were employed and the concentration of the reactants was kept constant, while the reaction rate of each metal was monitored as a function of time using different reactant proportions. It was demonstrated that the reaction rates depend not only on the chemical reduction rate, but also on the intermicellar exchange rate. Furthermore, intermicellar exchange causes the accumulation of slower precursors inside the micelles, which favors chemical reduction. As a consequence, slower reduction rates strongly correlate with the number of reactants in this confined media. On the contrary, faster reduction rates are limited by the intermicellar exchange rate and not the number of reactants inside the micelles. As a result, different precursor proportions lead to different sequences of metal reduction, and thus the arrangement of the two metals in the nanostructure can be manipulated. Beilstein-Institut 2014-11-04 /pmc/articles/PMC4222381/ /pubmed/25383307 http://dx.doi.org/10.3762/bjnano.5.206 Text en Copyright © 2014, Tojo et al. https://creativecommons.org/licenses/by/2.0https://www.beilstein-journals.org/bjnano/termsThis is an Open Access article under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The license is subject to the Beilstein Journal of Nanotechnology terms and conditions: (https://www.beilstein-journals.org/bjnano/terms)
spellingShingle Full Research Paper
Tojo, Concha
González, Elena
Vila-Romeu, Nuria
The impact of the confinement of reactants on the metal distribution in bimetallic nanoparticles synthesized in reverse micelles
title The impact of the confinement of reactants on the metal distribution in bimetallic nanoparticles synthesized in reverse micelles
title_full The impact of the confinement of reactants on the metal distribution in bimetallic nanoparticles synthesized in reverse micelles
title_fullStr The impact of the confinement of reactants on the metal distribution in bimetallic nanoparticles synthesized in reverse micelles
title_full_unstemmed The impact of the confinement of reactants on the metal distribution in bimetallic nanoparticles synthesized in reverse micelles
title_short The impact of the confinement of reactants on the metal distribution in bimetallic nanoparticles synthesized in reverse micelles
title_sort impact of the confinement of reactants on the metal distribution in bimetallic nanoparticles synthesized in reverse micelles
topic Full Research Paper
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4222381/
https://www.ncbi.nlm.nih.gov/pubmed/25383307
http://dx.doi.org/10.3762/bjnano.5.206
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