Method for activating metal particles
First Claim
1. A method for activating the surface of finely divided particles of conductive metals having a thin surface coating of oxide of the conductive metal comprising the steps of (a) treating the surface with an aqueous solution of a reducing agent for the oxide when the conductive metal is a noble metal and either a reducing agent for the oxide or an inorganic acid capable of reacting with the oxide to form a water-soluble salt of the metal ion when the conductive metal is a base metal, the reactive component of the aqueous solution being in molar excess of the oxide, (b) washing the surface of the treated particles with an aqueous liquid having a pH of 5.5-7.0 until essentially no change in pH takes place in the wash liquid, and (c) drying the surface of the washed particles.
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Abstract
A method for activating the surface of finely divided particles of conductive metals having a thin surface coating of an oxide of the conductive metal comprising the steps of (a) treating the surface with an aqueous solution of a reducing agent when the conductive metal is a noble metal and either a reducing agent for the oxide or an inorganic acid when the conductive metal is a base metal, (b) washing the surface of the treated particles with an aqueous liquid, and (c) drying the surface of the washed particles.
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Citations
8 Claims
- 1. A method for activating the surface of finely divided particles of conductive metals having a thin surface coating of oxide of the conductive metal comprising the steps of (a) treating the surface with an aqueous solution of a reducing agent for the oxide when the conductive metal is a noble metal and either a reducing agent for the oxide or an inorganic acid capable of reacting with the oxide to form a water-soluble salt of the metal ion when the conductive metal is a base metal, the reactive component of the aqueous solution being in molar excess of the oxide, (b) washing the surface of the treated particles with an aqueous liquid having a pH of 5.5-7.0 until essentially no change in pH takes place in the wash liquid, and (c) drying the surface of the washed particles.
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