On Metal Segregation of Bimetallic Nanocatalysts Prepared by a One-Pot Method in MicroemulsionsReportar como inadecuado


On Metal Segregation of Bimetallic Nanocatalysts Prepared by a One-Pot Method in Microemulsions


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1

Physical Chemistry Department, University of Vigo, E-36310 Vigo, Spain

2

Laboratorio de Magnetismo y Nanotecnología, University of Santiago de Compostela, E-15782 Santiago de Compostela, Spain





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Author to whom correspondence should be addressed.



Academic Editors: Alain Roucoux and Audrey Denicourt

Abstract A comparative study on different bimetallic nanocatalysts prepared from microemulsions using a one-pot method has been carried out. The analysis of experimental observations, complemented by simulation studies, provides detailed insight into the factors affecting nanoparticle architecture: 1 The metal segregation in a bimetallic nanocatalysts is the result of the combination of three main kinetic parameters: the reduction rate of metal precursors related to reduction standard potentials, the material intermicellar exchange rate determined by microemulsion composition, and the metal precursors concentration; 2 A minimum difference between the reduction standard potentials of the two metals of 0.20 V is needed to obtain a core-shell structure. For values ∆ε0 smaller than 0.20 V the obtaining of alloys cannot be avoided, neither by changing the microemulsion nor by increasing metal concentration; 3 As a rule, the higher the film flexibility around the micelles, the higher the degree of mixture in the nanocatalyst; 4 A minimum concentration of metal precursors is required to get a core-shell structure. This minimum concentration depends on the microemulsion flexibility and on the difference in reduction rates. View Full-Text

Keywords: bimetallic nanoparticles; nanocatalysts; microemulsion; simulation; one-pot method bimetallic nanoparticles; nanocatalysts; microemulsion; simulation; one-pot method





Autor: Concha Tojo 1,* , David Buceta 2 and Manuel Arturo López-Quintela 2

Fuente: http://mdpi.com/



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