| 摘要 |
<P>PROBLEM TO BE SOLVED: To compose metal colloid only from natural sources. <P>SOLUTION: A metal ion solution and a pH compensation agent are added to a treatment liquid obtained by adding a surfactant to water, and stirring is performed while the temperature of the treatment liquid is controlled in a reducing atmosphere, thus the metal ions are reduced to produce metal colloid. The produced metal colloid is noble metal colloid in which the metal is gold, silver, the platinum group or the like. As the reducing agent, low molecular weight alcohol is used. As the surfactant, glycerol fatty acid ester is used. As the metal ion solution, a solution of the acids of chlorinated noble metal is used. As the pH compensation agent, sodium hydrogen carbonate is used. The metal colloid is produced at a pH from a neutral region to a weak alkali region. Regarding its oxidation-reduction potential after the completion of the reduction reaction, it is a negative electric charge, and a negative potential higher than (-)200 mV is shown. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
