| 摘要 |
PURPOSE:To produce easily monodispersed ultrafine silver particles by adding a protective colloid into a reaction vessel in the stage of reducing an ammoniacal silver nitrate complex soln. in a hydrophobic reaction vessel. CONSTITUTION:The protective colloid is added into the reaction vessel in the stage of producing the ultrafine silver particles by reducing the ammoniacal silver nitrate complex soln. by using a reducing agent in the hydrophobic reaction vessel. Oil coating, surface active agent coating, etc. are used to keep hydrophobic the inside surface of the reaction vessel so that a precipitation reaction of silver is uniformly induced. Gelatin, gum arabic, etc. are used as the protective colloid so that the precipitated ultrafine silver particles maintain the monodisperse state without flocculation. The monodispersed ultrafine silver particles having a uniform grain size are thus produced in a large volume.
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