Method and apparatus for preparing powder carrying nano gold...

Details Method and apparatus for preparing powder carrying nano gold... Method and apparatus for preparing powder carrying nano gold...

2005-08-18

2009-12-01

Cleveland, Michael (Department: 1792)

Coating processes

Particles, flakes, or granules coated or encapsulated

C427S215000, C427S226000, C427S229000

Reexamination Certificate

active

07625599

ABSTRACT:
Disclosed is a method for preparing powder carrying nano gold by thermal decomposition, comprising the steps of: (1) providing a nano powder of artificial synthesized material or a natural mineral powder which particle size is in nano to micro scale as a carrier, preparing 0.2-5.0% (weight percentage concentration) gold bromide solution with deionized water and gold bromide, adding the carrier into the gold bromide solution, and a weight ratio of gold bromide and carrier is 1:1-1:1000, immersing the carrier into the solution for 0.5-4 hours in dark; (2) drying the immersed carrier and the solution at 50-90° C., and grinding the carrier to the fine mixed powders; and (3) heating the mixed powders obtained in step (2) at 200-350° C. for 0.5-3 hours in a heating apparatus flown argon gas or air at a flow rate of 1-10 L/min, and obtaining the carrier powder carrying nano gold after decreasing the heating temperature to room temperature under continuous air flow. The advantages of present invention includes: (1) it is a simple process, low cost, (2) there are no dispersant agent and surfactant in the product, and (3) there are no poisonous or harmful materials are excluded in the preparation process.

REFERENCES:
patent: 4438082 (1984-03-01), Dettling et al.
patent: 4698324 (1987-10-01), Haruta et al.
patent: 4971944 (1990-11-01), Charles et al.

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