Uniform metal nanoparticles produced at high yield in dense microemulsions
| Autor: | Ger J. M. Koper, Ugo Lafont, Michael Rappolt, Kowlgi Krishna Narayan Kumar |
|---|---|
| Rok vydání: | 2011 |
| Předmět: |
Coalescence (physics)
Materials science Dispersity Nanoparticle chemistry.chemical_element Surfaces Coatings and Films Electronic Optical and Magnetic Materials Biomaterials Colloid and Surface Chemistry chemistry Pulmonary surfactant Chemical engineering Yield (chemistry) Organic chemistry Microemulsion Platinum Stoichiometry |
| Zdroj: | Journal of colloid and interface science. 372(1) |
| ISSN: | 1095-7103 |
| Popis: | This article demonstrates that bicontinuous microemulsions are optimal templates for high yield production of metal nanoparticles. We have verified this for a variety of microemulsion systems having AOT (sodium bis (2-ethyhexyl) sulphosuccinate) or a fluorocarbon (perfluoro (4-methyl-3,6-dioxaoctane)sulphonate) as surfactant mixed with water and oils like n-heptane or n-dodecane. Several types of metal nanoparticles, including platinum, gold and iron, were produced in these microemulsions having a size range spanning 1.8-17 nm with a very narrow size distribution of ±1 nm. Remarkably high mass concentrations up to 3% were reached. Size and concentration of the nanoparticles could be varied with the stoichiometries of the reagents that constituted them. The optimization towards high yield while maintaining low size polydispersity is due to the decoupling of the time scales for the precipitation reaction and for coarsening. In actual fact, coalescence is essentially prevented by the immobilization of nanoparticles within the bicontinuous microemulsion structure. |
| Databáze: | OpenAIRE |
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