JP6158166: Stable oxide encapsulated metal clusters and nanoparticles

The invention discloses stable, non-agglomerated, ultra-small metal/alloy clusters encapsulated in silica with a metal/alloy cluster size of less than 5 nm. The invention further discloses a simple, cost-effective process for the preparation of metal/alloy clusters encapsulated in silica which is thermally stable and without agglomeration.