| 摘要 |
PURPOSE:To produce singly dispersed fine copper particles having a narrow particle size distribution by reducing an aq. copper sulfate soln. with hypophosphorous acid or a salt thereof. CONSTITUTION:The pH of an aq. copper sulfate soln. is adjusted to about 0.3-5 by adding dil. sulfuric acid or the like. The pH of an aq. soln. of hypophosphorous acid or a salt thereof is adjusted to about 1-10 by adding NaOH or the like. The temps. of the solns. are regulated to about 30-100 deg.C and the hypophosphorous acid (salt) soln. is added to the copper sulfate soln. with stirring to reduce copper ions in the copper sulfate soln. The resulting fine copper particles are separated by filtration and washed. Thus, singly dispersed fine copper particles having a narrow particle size distribution can be produced under control on particle size.
|
