| Title: |
On Metal Segregation of Bimetallic Nanocatalysts Prepared by a One-Pot Method in Microemulsions |
| Authors: |
Concha Tojo; David Buceta; Manuel Arturo López-Quintela |
| Source: |
Catalysts, Vol 7, Iss 2, p 68 (2017) |
| Publisher Information: |
MDPI AG |
| Publication Year: |
2017 |
| Collection: |
Directory of Open Access Journals: DOAJ Articles |
| Subject Terms: |
bimetallic nanoparticles; nanocatalysts; microemulsion; simulation; one-pot method; Chemical technology; TP1-1185; Chemistry; QD1-999 |
| Description: |
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. |
| Document Type: |
article in journal/newspaper |
| Language: |
English |
| Relation: |
http://www.mdpi.com/2073-4344/7/2/68; https://doaj.org/toc/2073-4344; https://doaj.org/article/e6b02d8457e14ef496ff3d40d1231fba |
| DOI: |
10.3390/catal7020068 |
| Availability: |
https://doi.org/10.3390/catal7020068; https://doaj.org/article/e6b02d8457e14ef496ff3d40d1231fba |
| Accession Number: |
edsbas.20A5A08C |
| Database: |
BASE |