CSMNs are versatile and can be used in a wide range of reactions including hydrogenation, oxidation, and photocatalysis. For example, in hydrogenation reactions, the shell can be functionalized with [palladium]( ) or [nickel]( ) to catalyze the addition of hydrogen to various organic compounds. In oxidation reactions, CSMNs can be modified with [titania]( ) or [manganese oxides]( ) to facilitate the conversion of pollutants into less harmful substances.