A kind of method for preparing nano-scale silver particle powder by graded reduction of silver salt intermediate
An intermediate, silver particle technology, applied in metal processing equipment, transportation and packaging, etc., can solve the problems of low collection efficiency, high cost, complex production process, etc., and achieve the effects of mild reaction conditions, low cost and high yield
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Embodiment 1
[0045] Sodium citrate, silver nitrate, glucose and ascorbic acid were dissolved in deionized water to prepare a sodium citrate solution with a concentration of 0.38mol / L, a silver nitrate solution with a concentration of 1.47mol / L, and a glucose solution with a concentration of 1.85mol / L. Solution and concentration are the ascorbic acid solution of 0.85mol / L;
[0046] First put the sodium citrate solution with a concentration of 0.38mol / L in the reaction kettle as the reaction bottom liquid, and slowly add the silver nitrate solution with a concentration of 1.47mol / L to the sodium citrate solution at 75°C In the process, the molar ratio of silver ions to sodium citrate was 1:0.58, then stirred at a speed of 800r / min, and continued stirring for 10 minutes to obtain a milky white silver salt intermediate;
[0047] Quickly add glucose solution with a concentration of 1.85mol / L to the silver salt intermediate so that the molar ratio of silver ions to glucose is 1:0.86, and keep st...
Embodiment 2
[0052] Nanoscale silver particle powder was prepared in the same manner as in Example 1 except for the contents shown in Table 1. The reaction obtains purple-red nano-scale silver particle powder. The yield of the nanoscale silver particle powder is 99.6%, and the purity is 99.5%. The particle size of the nano-scale silver particle powder obtained by scanning electron microscope observation is concentrated in 10-30 nm, and the average particle size is 20 nm.
Embodiment 3
[0054] Nanoscale silver particle powder was prepared in the same manner as in Example 1 except for the contents shown in Table 1. The reaction obtains purple-gray nano-scale silver particle powder. The yield of the nano-scale silver particle powder is 99.9%, and the purity is 99.2%. The particle size of the nano-scale silver particle powder obtained by scanning electron microscope observation is concentrated in 30-60 nm, and the average particle size is 40 nm.
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