Unagglomerated core-shell particles, useful e.g. as biocide, UV-protection and luminescent pigment or pigment for water treatment, have inorganic core, e.g. of oxide or semiconductor, and shell of inorganic oxide or metal

摘要

Core-shell particles (I) have a core of inorganic nanoparticles with a particle size less than 100 nm and an inorganic oxide shell and are largely, preferably completely, unagglomerated. Independent claims are also included for the following: (1) core-shell particles (II) produced from a core of inorganic nanoparticles with a particle size of under 100 nm and a shell of inorganic oxide/hydroxide, in which the shell is applied by a wet chemical reaction by changing the pH, using an enzymes, and the resultant powder is calcined after removing the solvent; similar core-shell particles (III), with a core of inorganic semiconductor nanoparticles with a particle size less than 100 nm and metal shell; (2) core-shell particles of type (III) in which the shell is produced by photo-induced redox reaction of metal ions on the semiconductor surface and the powder is calcined after removing the solvent.