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

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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 t

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
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Example Embodiment

[0036] Example 1

[0037] The above-mentioned chitosan with a degree of deacetylation ≥70% and an average molecular weight of about 20,000 was dissolved in 0.02% acetic acid, and then the solution was mixed with a silver nitrate solution to obtain a mixed solution, which contained 0.005wt% chitosan Sugar and 2.0×10 -3 mol.L -1 Of silver nitrate. The pH of the mixed solution is adjusted to 3.0 with acetic acid; pure nitrogen is introduced for deoxygenation, and 60 Co source was irradiated with an irradiation dose of 10kGy to obtain a brownish-yellow solution; this solution was dropped on a copper net for drying, and then scanned with a transmission electron microscope. The result is shown in Figure 1A (TEM magnification of 40 thousand times, the scale of the figure is 50nm) As shown, the particle size distribution is shown in Figure 1B.

[0038] The results show that: it can be seen from Fig. 1A that the particle size of the silver nanoparticles prepared by the preparation method o...

Example Embodiment

[0039] Example 2

[0040] The above-mentioned chitosan with a degree of deacetylation ≥70% and an average molecular weight of about 20,000 is dissolved in 0.01% acetic acid, and then the solution is mixed with a silver nitrate solution to obtain a mixed solution, which contains 0.005wt% chitosan Sugar and 1.0×10 -3 mol.L -1 Of silver nitrate, the mixed solution is adjusted to pH 3.0 with acetic acid; pure nitrogen is passed in 60The Co source was irradiated with an irradiation dose of 10kGy to obtain a yellow solution; this solution was dropped on a copper net for drying, and then scanned with a transmission electron microscope. The result is shown in Figure 2A (forty thousand times magnification, the scale of the figure is 50nm). , The particle size distribution is shown in Figure 2B.

[0041] The results show that: it can be seen from FIG. 2A that the particle size of the silver nanoparticles prepared by the preparation method of the present invention is relatively uniform, and ...

Example Embodiment

[0042] Example 3

[0043] The above-mentioned chitosan with a degree of deacetylation ≥70% and an average molecular weight of 15,000 is dissolved in 0.03% acetic acid, and then the solution is mixed with a silver nitrate solution to obtain a mixed solution, which contains 0.005wt% chitosan Sugar and 5.0×10 -4 mol.L -1 Of silver nitrate, the mixed solution is adjusted to pH 3.0 with acetic acid; pure nitrogen is introduced for deoxygenation, with 60 The Co source was irradiated with an irradiation dose of 10kGy to obtain a bright yellow solution; this solution was dropped on a copper net for drying, and then scanned with a transmission electron microscope. The result is shown in Figure 3A (TEM magnification of 40 thousand times, the scale of the figure is 50nm) As shown, the particle size distribution is shown in Figure 3B.

[0044] The results show that: it can be seen from FIG. 3A that the particle size of the silver nanoparticles prepared by the preparation method of the present...

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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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