硝酸銀/グリセリン溶液のマイクロ波加熱による銀粒子の生成

概要

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Microwaves of 2.45GHz frequency from a commercial microwave oven irradiated a glycerol solution of AgNO_3. By the irradiation of microwaves, the temperature of the reaction solution increased up to above the boiling point of glycerin. After ceasing irradiation, the color of the solution turned to yellow, and fine silver particles were formed. From an XRD analysis, it was found that the resulting fine particles had crystal-like structures. SEM observations showed the generation of large (〜1μm) particles. From laser scattering measurements, on the other hand, Ag fine particles with a mean size of 〜100nm were also found in the supernatant solution after a centrifugal separation. The formation of 〜1μm crystal-like particles may result from the collisions of fine particles produced during the microwave irradiation process. The results imply that glycerin reduces Ag^+ to Ag effectively.
2005-10-05