| abstract |
To provide core-shell particles having a dense shell, and a method whereby the core-shell particles can be produced in a short period of time. n Core particles wherein the shell has a thickness of from 1 to 500 nm and has 0.01 cc/g as the maximum pore volume value of pores having diameters of at most 3 nm in a pore volume histogram obtained by nitrogen adsorption, and an average particle size in a dispersion medium is from 1 to 1,000 nm; is obtained by irradiating a liquid containing core particles made of a material having a dielectric constant of at least 10 and a metal oxide precursor with a microwave to form a shell made of a metal oxide on the surface of the core particles. |