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Method for preparing Nano silver grain, and prepared Nano silver grain

A technology of silver nanoparticles and silver nitrate, applied in botany equipment and methods, chemical instruments and methods, dyeing polymer organic compound treatment, etc., can solve the problems of low solubility of silver nanoparticles, limited use of silver nanoparticles, insolubility, etc. , to achieve good water solubility and biocompatibility, no toxic side effects, and good uniformity

Inactive Publication Date: 2007-10-10
SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the solubility of silver nanoparticles prepared by these coating materials is very small or even insoluble in water, thus limiting the further use of silver nanoparticles
At present, there have been some studies on improving the water solubility of silver nanoparticles. The coating agents include alcohols, pyridines or dendrimers. If there is a small amount of coating agent remaining in the silver nanoparticle products, it has potential biological toxicity.

Method used

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  • Method for preparing Nano silver grain, and prepared Nano silver grain
  • Method for preparing Nano silver grain, and prepared Nano silver grain
  • Method for preparing Nano silver grain, and prepared Nano silver grain

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Dissolve the above-mentioned chitosan with a deacetylation degree ≥ 70% and an average molecular weight of about 20,000 in 0.02% acetic acid, and then mix the solution with silver nitrate solution to obtain a mixed solution, which contains 0.005wt% chitosan sugar and 2.0 x 10 -3 mol.L -1 of silver nitrate. The mixed solution was adjusted to pH 3.0 with acetic acid; 60 The Co source was irradiated, and the irradiation dose was 10kGy to obtain a brownish-yellow solution; the solution was dropped on a copper grid to dry, and then scanned with a transmission electron microscope. As shown, the particle size distribution is shown in Fig. 1B.

[0038] The result shows: as can be seen from Fig. 1A, the particle diameter of the silver nano-particle that preparation method of the present invention makes is relatively uniform, and Fig. 1B also can prove that particle diameter is uniformly distributed, and average particle diameter is 16nm.

Embodiment 2

[0040] Dissolve the above-mentioned chitosan with a deacetylation degree ≥ 70% and an average molecular weight of about 20,000 in 0.01% acetic acid, and then mix the solution with silver nitrate solution to obtain a mixed solution, which contains 0.005wt% chitosan sugar and 1.0 x 10 -3 mol.L -1 silver nitrate, the mixed solution was adjusted to pH 3.0 with acetic acid; 60The Co source was irradiated, and the irradiation dose was 10kGy to obtain a yellow solution; the solution was dropped on a copper grid to dry, and then scanned with a transmission electron microscope. The result is shown in Figure 2A (magnified by 40,000 times, and the scale bar in the figure is 50nm). , the particle size distribution is shown in Fig. 2B.

[0041] The result shows: as can be seen from Fig. 2A, the particle diameter of the silver nanoparticle that preparation method of the present invention makes is more uniform, Fig. 2B also can prove that particle diameter is uniform distribution, and the ...

Embodiment 3

[0043] Dissolve the above-mentioned chitosan with a deacetylation degree ≥ 70% and an average molecular weight of about 15,000 in 0.03% acetic acid, and then mix the solution with silver nitrate solution to obtain a mixed solution, which contains 0.005wt% chitosan sugar and 5.0 x 10 -4 mol.L -1 silver nitrate, the mixed solution was adjusted to pH 3.0 with acetic acid; 60 The Co source was irradiated, and the irradiation dose was 10kGy to obtain a bright yellow solution; the solution was dropped on a copper grid to dry, and then scanned with a transmission electron microscope. As shown, the particle size distribution is shown in Fig. 3B.

[0044] The result shows: as can be seen from Fig. 3A, the particle diameter of the silver nanoparticle that preparation method of the present invention makes is relatively uniform, and Fig. 3B also can prove that particle diameter is uniform distribution, and the average particle diameter of silver nanoparticle is 8nm.

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Abstract

This invention discloses a method for preparing Ag nanoparticles. The method comprises: (1) mixing acid solution of chitosan and AgNO3 solution to obtain a mixed solution; (2) adjusting the pH value to 3.0-5.0; (3) irradiating without oxygen. The deacetylation degree of chitosan is greater than or equal to 70%, and the average molecular weight is less than or equal to 20000. The concentration of chitosan in the mixed solution is 0.001-0.05 wt. %, and that of AgNO3 is 0.01-23.5 mM. The obtained Ag nanoparticles have such advantages as small average particle size, uniform particle size distribution, high solid content, high water solubility, and high biocompatibility.

Description

technical field [0001] The invention relates to a preparation method of silver nanoparticles and the prepared silver nanoparticles. Background technique [0002] Silver nanoparticles have good antibacterial properties and photoelectrochemical properties, and are widely used in nanocatalytic carriers, solar energy conversion, biosensors and various antibacterial materials. There are many methods for preparing silver nanoparticles, such as chemical reduction method, evaporation sputtering method and radiation reduction method. In these preparation processes, two difficult problems that are difficult to overcome are to prevent the metal silver that has formed nanoparticles from being oxidized by air or other substances and to stabilize the dispersion of silver nanoparticles. An effective way to solve these two problems is to modify the surface of the prepared nanoparticles, that is, to load a layer of polymer substances or charged groups on the surface of the silver nanopartic...

Claims

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Application Information

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IPC IPC(8): C09C1/62C09C3/10A01N59/16B01J32/00
Inventor 龙德武吴国忠
Owner SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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