Method for preparing antibacterial nanometer silver colloid
A nano-silver sol, water-soluble technology, applied in botany equipment and methods, chemicals for biological control, biocides, etc., can solve the problems of poor stability of nano-silver, and achieve low cost, short production cycle, and high production efficiency. high rate effect
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Embodiment 1
[0028] (1) take by weighing 0.0085g silver nitrate and prepare 50ml concentration with deionized water and be the silver nitrate aqueous solution of 0.001M, then get 0.0085g dextran and be dissolved in above-mentioned silver nitrate aqueous solution (the mass ratio of dextran and silver nitrate is 1: 1), slowly stir for subsequent use;
[0029] (2) Weigh 0.0189g of sodium borohydride and prepare 250ml of sodium borohydride aqueous solution with a concentration of 0.002M with deionized water, and ice-bath for 20min;
[0030] (3) the dextran-containing silver nitrate aqueous solution of step (1) is added dropwise in the sodium borohydride aqueous solution under the ice bath, and the dropping speed is 60 drops / min, while using a magnetic stirrer to stir vigorously, the rotating speed is 500 rpm;
[0031] (4) Continue to stir for 20 minutes after the dropwise addition to make it fully react.
[0032] Finally, a bright yellow nano-silver sol is obtained, the average particle size...
Embodiment 2
[0034] (1) take by weighing 0.085g silver nitrate and prepare 50ml concentration with deionized water and be the silver nitrate aqueous solution of 0.01M, then get 0.085g dextran and be dissolved in above-mentioned silver nitrate aqueous solution (the mass ratio of dextran and silver nitrate is 1: 1), slowly stir for subsequent use;
[0035] (2) Weigh 0.189g of sodium borohydride and prepare 250ml of sodium borohydride aqueous solution with a concentration of 0.02M with deionized water, and ice-bath for 30min;
[0036] (3) the dextran-containing silver nitrate aqueous solution of step (1) is added dropwise in the sodium borohydride aqueous solution under the ice bath, and the dropping speed is 45 drops / min, while using a magnetic stirrer to stir vigorously, the rotating speed is 800 rpm;
[0037](4) Continue to stir for 30 minutes after the dropwise addition to make it fully react.
[0038] Finally made red black nano-silver sol, the average particle diameter of nano-silver ...
Embodiment 3
[0040] (1) take by weighing 0.17g silver nitrate and prepare 100ml concentration with deionized water and be the silver nitrate aqueous solution of 0.01M, then get 0.085g dextran and 0.085gPVP miscible in above-mentioned silver nitrate aqueous solution (dextran / PVP mixed protecting agent The mass ratio with silver nitrate is 1: 1), slowly stirred for subsequent use;
[0041] (2) Weigh 0.378g of sodium borohydride and prepare 500ml of sodium borohydride aqueous solution with a concentration of 0.02M with deionized water, and ice-bath for 30min;
[0042] (3) The silver nitrate aqueous solution containing the dextran / PVP protective agent of step (1) is added dropwise in the sodium borohydride aqueous solution under the ice bath, and the dropping speed is 45 drops / min, while using a magnetic stirrer to vigorously Stirring, the rotating speed is 800 rpm;
[0043] (4) Continue to stir for 30 minutes after the dropwise addition to make it fully react.
[0044] Finally, a red and bl...
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