Preparation of Iron Nanoparticles by Selective Leaching Method

Abstract

Iron nanoparticles were prepared by selective leaching method. Initially the rapidly solidied AlFe11 alloy was prepared and consequently the aluminium matrix was dissolved from this alloy in 20% NaOH solution. This process was carried out at 0 and 80• C. At lower temperature, the iron nanoparticles covered by thin layer of Fe(OH)3 were successfully obtained. The size of formed nanoparticles was about 8 nm and the particles exhibited massive agglomeration. It is not limitation of the process, because the application of nanoparticles is as a precursor for production of bulk nanocrystalline materials (metals, alloys and metal matrix composites). At higher temperature, the selective leaching process failed and iron was oxidized to dierent hydroxides. Aluminium containing waste liquid from selective leaching was used for production of powder Al2O3. Initial alloys and products were characterized by X-ray diraction, scanning electron microscopy, and high resolution transmission electron microscopy.

Ag‐Based Bimetallic Nanoparticles for the Catalytic Reduction of Nitrophenol and Organic Dyes: An Overview

“…4 leached from the initially homogenous materials by selective leaching or dealloying treatment, thus forming high amounts of nanopowder. [52] Sequential reduction: When the particles go under simultaneous reduction the core-shell nanoparticle is formed based on the reduction potential of the metal precursor. In the sequential reduction by changing the sequence of precursor addition, the shell particle size of 65 nm was formed.…”

“…The core is composed of metals while the oxides and hydroxides form the shell. The alloy is preferentially leached from the initially homogenous materials by selective leaching or dealloying treatment, thus forming high amounts of nanopowder [52] …”