Multifunctional gold and silver core-shell nanoparticles and preparation method
A gold-silver core-shell and nanoparticle technology, which is applied in the direction of nuclear magnetic resonance/magnetic resonance imaging contrast agents, antibacterial drugs, etc., can solve the problems of poor prognosis, achieve broad-spectrum antibacterial ability, react without energy consumption, and inhibit the damage to the body. Effect of infection
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Embodiment 1
[0024] Measure 20uL tetrakishydroxymethylphosphorus chloride solution, add 20mL 0.05mol / L potassium hydroxide aqueous solution to activate, prepare organophosphorus precursor solution with reducing activity, stir for 5min and then stand still for use.
[0025] Quickly add 50 μL of 0.01mol / L chloroauric acid solution into the above-mentioned reducing organophosphorus precursor solution, and react for 10 minutes under stirring conditions, then add 200 μL of 0.01mol / L silver nitrate solution, and then continue stirring for 2 hours. The solution was purified by centrifugation, the supernatant was discarded, the product was re-dispersed in deionized water after de-washing, and the above-mentioned washing and re-dispersing process was repeated at least three times to finally obtain a purified product, which was re-dispersed in absolute ethanol to obtain brown-yellow gold and silver The core-shell nanoparticle sol has an average particle size of 15nm, wherein the size of the gold nano...
Embodiment 2
[0027] Measure 30uL tetrakishydroxymethylphosphorus chloride solution, add 30mL 0.07mol / L sodium hydroxide aqueous solution to activate, and prepare organophosphorus precursor solution with reductive activity, stir for 10min and let it stand for use.
[0028]Quickly add 100 μL 0.05mol / L chloroauric acid solution into the above-mentioned reducing organophosphorus precursor solution, and react for 20 minutes under stirring conditions, then add 150 μL 0.05mol / L silver nitrate solution, and then continue to stir for 1.5 hours. The solution was purified by centrifugation, the supernatant was discarded, the product was re-dispersed in deionized water after de-washing, and the above-mentioned washing and re-dispersing process was repeated at least three times to finally obtain a purified product, which was re-dispersed in absolute ethanol to obtain reddish-brown gold and silver The core-shell structure nanoparticle sol was analyzed by ultraviolet-visible light absorption spectrum. The...
Embodiment 3
[0030] Measure 40 μL of tetrakis hydroxymethyl phosphorus chloride solution, add 50 mL of 0.45 mol / L potassium hydroxide aqueous solution to activate, prepare the organophosphorus precursor solution with reductive activity, stir for 20 min, and let it stand for use.
[0031] Quickly add 200 μL 0.08mol / L chloroauric acid solution into the above-mentioned reducing organophosphorus precursor solution, and react for 8 minutes under stirring conditions, then add 300 μL 0.08mol / L silver nitrate solution, and then continue to stir for 1 hour. The solution is purified by centrifugation, the supernatant is discarded, the product is re-dispersed in deionized water after de-washing, and the above-mentioned washing and re-dispersing process is repeated at least three times to finally obtain a purified product, which is re-dispersed in absolute ethanol to obtain orange-yellow gold and silver cores The shell-structured nanoparticle sol is analyzed by X-ray photoelectron spectroscopy for its ...
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