What is it about?
Metal alloy nanoparticles can rust quickly in water, limiting real-world use. We developed a one-step microwave process to make nickel–iron alloy nanoparticles in water. We tuned the iron content and tracked size, structure, and magnetic strength. The particles stayed oxide-free for over a year in water and even after heat sterilization.
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Why is it important?
This is a fast, scalable route that avoids inert gas, organic solvents, and post-processing. Using iron(II) precursors keeps the alloy phase clean up to about 25% iron; beyond that, oxides appear. The surface coating formed during synthesis helps explain the long-term stability in water. Stable, high-magnetization particles are easier to handle and separate in aqueous systems. This opens practical paths for magnetic separation, in vitro diagnostics, and radiofrequency components.
Perspectives
These alloy nanoparticles could remain stable in water for more than a year. A key design choice was combining rapid microwave heating with a surface-bound diol coating formed in situ. An important insight was how strongly the iron precursor choice steers whether the product stays alloy or forms oxides. Next, I would pair this synthesis with more biocompatible surface chemistries and test stability in real biofluids. That could help move nickel–iron nanoparticles from promising materials toward dependable tools in aqueous applications.
Dr Daniel Ortega
Universidad de Cadiz
Read the Original
This page is a summary of: Microwave-assisted NixFe1−x nanoclusters ultra-stable to oxidation in aqueous media, Nanoscale, January 2022, Royal Society of Chemistry,
DOI: 10.1039/d2nr03629k.
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