Preparation method of nanometer sliver colloid solution
A colloidal solution and nano-silver technology, which is applied in the field of preparation of nano-silver colloidal solution, can solve the problems of complex steps and difficult particle size control, and achieve the effects of high antibacterial efficiency, small particle size of nano-silver, and less dosage.
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Embodiment 1
[0016] 1. Dissolve 0.1g of 2-O-nonyl-β-cyclodextrin in 100ml of deionized water to obtain a 0.1% aqueous solution of 2-O-nonyl-β-cyclodextrin;
[0017] 2. Prepare 1.0mol / L silver nitrate solution, add 5 drops of 0.1mol / L sodium hydroxide solution dropwise, then add dropwise 5% ammonia solution until the precipitation disappears, and obtain silver ammonia with a molar concentration of 0.1mol / L solution;
[0018] 3. Mix 0.1% 2-O-nonyl-β-cyclodextrin aqueous solution and silver ammonia solution with a molar concentration of 0.1mol / L at a volume ratio of 1:50, stir at 80°C for 40min, and obtain the particle size It is a nano-silver colloid solution of 5-20nm.
Embodiment 2
[0020] 1. Dissolve 0.1g of 2-O-dodecyl-α-cyclodextrin in 100ml of deionized water to obtain a 0.1% aqueous solution of 2-O-dodecyl-α-cyclodextrin;
[0021] 2. Prepare 1.0mol / L silver nitrate solution, add 5 drops of 0.1mol / L sodium hydroxide solution dropwise, then add 5% diethylenetriamine aqueous solution dropwise until the precipitate disappears, and the molar concentration is 0.1mol / L silver ammonia solution;
[0022] 3. Mix 0.1% 2-O-dodecyl-α-cyclodextrin aqueous solution and silver ammonia solution with a molar concentration of 0.1mol / L at a volume ratio of 1:50, and stir at 100°C for 10 minutes to obtain Nano silver colloid solution with a particle size of 5-20nm.
Embodiment 3
[0024] 1. Dissolve 0.1g of 2,6-di-O-octyl-γ-cyclodextrin in 100ml of deionized water to obtain 0.1% 2,6-di-O-octyl-γ-cyclodextrin aqueous solution;
[0025] 2. Prepare 1.0mol / L silver nitrate solution, add 5 drops of 0.1mol / L sodium hydroxide solution dropwise, then add 5% tetraethylenepentamine aqueous solution dropwise until the precipitate disappears, and the molar concentration is 0.1mol / L silver ammonia solution;
[0026] 3. Mix 0.1% 2,6-di-O-octyl-γ-cyclodextrin and silver ammonia solution with a molar concentration of 0.1 mol / L at a volume ratio of 1:50, and stir at 100°C for 20 minutes, A nano-silver colloid solution with a particle diameter of 5-20 nm is obtained.
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