Non-Metallic Nano/Micro Particles Coated with Metal, Process and Applications Thereof
a technology of nano-micro particles and metal, applied in the field of non-metallic nano-micro particles coated with metal, can solve the problems of reducing the economic value of discarded foods, consuming large amounts of food, and consuming large amounts of food, and achieves excellent algaecide and bacteriostatic properties, similar or higher efficiency, and long-term storage
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example 1
[0030]Step 1: Silver nitrate loading: 100 grams (0.591 gram moles) of silver nitrate is dissolved in demineralized water (1-2 liters) and the silver nitrate solution is subsequently diluted by the addition of 10-12 liters of demineralized water. Nonsurface treated precipitated calcium carbonate (10 kg) is added to the solution with constant stirring to ensure uniform mixing. The mixture is dried in an oven at a temperature below 120° C.
[0031]Step 2: Reduction of silver nitrate coated nano / micro particles using hydrazine hydrate: 50 g of 85% Hydrazine hydrate (1.325 gram mole) is dissolved in demineralized water (1 liter). This was added to the dried silver nitrate loaded calcium carbonate with constant stirring in a sigma mixer and allowed to react for four hours. The mixture was dried at 100-125° C. in an oven to obtain coated silver nano / micro particles with a calcium carbonate core. The particles were slurried in demineralized water, filtered and washed till free of any residual ...
example 2
[0032]Step 1: Silver nitrate loading: 158.8 grams (0.934 gram moles) of silver nitrate is dissolved in demineralized water (1-2 liters) and subsequently diluted by the addition of 100-120 liters of demineralized water. Fumed silica (10 kg) is added to the solution with constant stirring to ensure uniform mixing.
[0033]Step 2: Reduction of silver nitrate nano particles using hydrazine hydrate: 50 g of 85% Hydrazine hydrate (1.325 gram mole) is dissolved in demineralized water (1 liter). Hydrazine hydrate solution is added with constant stirring to the dispersion of example 1 and kept for four hours. The mixture is dried at 50-65° C. in an oven to obtain coated silver nano / micro particles with fumed silica core. The particles are slurried in demineralized water, filtered and washed till free of any residual reducing agent and are used either as wet or as a flush in the required medium. The nano silica particles tend to flocculate if completely dried.
example 3
[0034]15 g Palladium chloride is dissolved in 150 cc 2 N hydrochloric acid and diluted to 100 liters with demineralized water. 10 kg of fumed silica is thoroughly mixed with this solution to allow a very fine layer of palladium chloride to be deposited on the surface of the particles. These are reduced by the addition of 100 g of hydrazine hydrate diluted to 1 liter. The reduced particles appear slightly black in color.
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