Patent ID: 7592042

Claim:
A method of producing a core/shell particle comprising: forming a core component by mixing a reverse micelle solution (1) including a reducing agent with one or more reverse micelle solutions (2) including a metal salt, and carrying out a reduction treatment at a temperature in the range of from −5° C. to 30° C.; coating the core component with a shell component by adding a reverse micelle solution (3a) containing a hydrolysate and/or a partial condensate of a compound represented by the following formula (I) in the form of a sol composition, wherein the coating step further includes, after the addition of the reverse micelle solution (3a) containing the hydrolysate and/or the partial condensate of the compound represented by formula (I), heating at a temperature in the range of from 30° C. to 90° C.; and annealing after the coating; (R) m —A(X) 4-m Formula (I) wherein in formula (I), R represents a substituted or unsubstituted alkyl group, or a substituted or unsubstituted aryl group; A represents Si or Ti; X represents a hydroxyl group or a hydrolyzable group; and m represents an integer of 1 to 3.