09-03-2007 дата публикации
Номер: KR100691908B1
A method of coating metal oxide superfine particles on the surface of metal oxides and a coating produced therefrom are provided to obtain a core shell type coating by uniformly coating nano-sized superfine particles on the surface of the metal oxides. A method of coating metal oxide superfine particles on the surface of metal oxides comprises the steps of: (i) contacting metal(M1) oxides with an aqueous solution of metal(M2) salt to be coated on the metal oxides to provide a mixed solution; and (ii) continuously mixing and reacting the mixed solution with water at a temperature of 200 to 700 deg.C and a pressure of 180 to 550 bars. The method further comprises a step of adding a precipitant to the mixed solution between the step(i) and the step(ii). The precipitant is ammonia water. The metal(M1) of the metal(M1) oxides is at least one selected from Si, Al, Li, Mg, Ca, Sr, Ba, Y, Nb, La, Ti, Zr, Cr, Mo, W, Mn, Fe, Co, Ni, Cu, Zn, Ce and Pr. The metal(M2) of the metal(M2) salt is at least one selected from Si, Al, Sc, Ga, Li, Mg, Ca, Sr, Ba, Y, Nb, La, Ti, Zr, Cr, Mo, W, Mn, Fe, Ru, Rh, Pd, Ir, Pt, Co, Ni, Cu, Ag, Zn, Cd, Ce, Pr, Nd, Sm, Eu and Gd.
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