Preparation method for nano silver chitosan composite microsphere
A technology of composite microspheres and nano-silver, which is applied in the field of antibacterial, can solve the problems of high surface energy and unstable properties of nano-silver particles, and achieve the effects of simple operation, extended shelf life, and reduced pollution
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[0022] Example 1
[0023] (1) Preparation of nano silver
[0024] Dissolve 1.699g silver nitrate in 10ml deionized water to obtain a 1M silver nitrate solution. Dissolve 3.6g glucose, 0.56g sodium hydroxide and 2.4g polyvinylpyrrolidone in 20ml deionized water to prepare a reducing solution; The solution was slowly added dropwise to the reducing solution and stirred vigorously at 60 degrees. After the addition was completed, stirring was continued for 10 minutes to obtain a grayish brown sol. The sol was centrifuged at 3000r / min, and the solid was washed with deionized water and ethanol. After three times, it was dried in an oven at 50 degrees for 24 hours to obtain dark brown solid silver nanoparticles.
[0025] (2) Preparation of nano silver antibacterial solution
[0026] Dissolve 0.3g of chitosan in 30mL of 3%(v / v) acetic acid solution, stir to make it completely dissolved at room temperature, take 0.1g of nano silver particles and add them to the chitosan solution while stirring...
Example Embodiment
[0029] Example 2
[0030] (1) Preparation of nano-silver: using the preparation in Example 1 to obtain nano-silver particles.
[0031] (2) Preparation of nano silver antibacterial solution
[0032] Dissolve 0.3 g of chitosan in 30 mL of 3% (v / v) acetic acid solution, and stir to make it completely dissolved at room temperature. Take 0.2 g of nano silver particles and add them to the chitosan solution while stirring. A dark brown nano silver antibacterial solution is obtained.
[0033] (3) Preparation of nano silver chitosan composite microspheres: The nano silver chitosan composite microspheres prepared in Example 1 were used.
Example Embodiment
[0034] Example 3
[0035] (1) Preparation of nano-silver: using the preparation in Example 1 to obtain nano-silver particles.
[0036] (2) Preparation of nano silver antibacterial solution
[0037] Dissolve 0.3g of chitosan in 30mL of 3%(v / v) acetic acid solution, stir to make it completely dissolved at room temperature, take 0.3g of nano silver particles and add them to the chitosan solution while stirring. A dark brown nano silver antibacterial solution is obtained.
[0038] (3) Preparation of nano silver chitosan composite microspheres: The nano silver chitosan composite microspheres prepared in Example 1 were used.
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