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
0 Cites 29 Cited by

AI-Extracted 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 t...
View more

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.

Application Domain

BiocideCatalyst carriers +3

Technology Topic

Ag nanoparticlesNanometre +10

Image

  • 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(9)
  • Effect test(2)

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 of the present invention is relatively uniform, and Fig. 1B can also prove that the particle size is uniformly distributed, and the average particle size is 16 nm.

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 FIG. 2B can also prove that the particle size is uniformly distributed, and the average particle size of the silver nanoparticles is 10 nm.

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 invention is relatively uniform, and FIG. 3B can also prove that the particle size is uniformly distributed, and the average particle size of the silver nanoparticles is 8 nm.

PUM

PropertyMeasurementUnit
The average particle size10.0nm
The average particle size8.0nm
The average particle size5.0nm

Description & Claims & Application Information

We can also present the details of the Description, Claims and Application information to help users get a comprehensive understanding of the technical details of the patent, such as background art, summary of invention, brief description of drawings, description of embodiments, and other original content. On the other hand, users can also determine the specific scope of protection of the technology through the list of claims; as well as understand the changes in the life cycle of the technology with the presentation of the patent timeline. Login to view more.

Similar technology patents

Gravity casting machine of wheel hub

Owner:NINGBO CANDONG MOLD TECH

Pollution source fine particulate matter dilution sampling method and device

InactiveCN104792582Agood uniformityThe sampling volume is defined
Owner:QINGDAO JINGYIXIN ELECTRONICS TECH

Aircraft large-size panel shear loading apparatus

ActiveCN105043899Aflexible scalegood uniformity
Owner:CHINA AIRPLANT STRENGTH RES INST

Ultrasonic micro-reactor preparation method of nano-drug

PendingCN112691625ASmall average particle sizegood monodispersity
Owner:DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI

Preparation method of nano zinc oxide

PendingCN112340767ASmall average particle sizeLarge specific surface area
Owner:安徽泰龙锌业有限责任公司

Classification and recommendation of technical efficacy words

  • Good uniformity
  • Small average particle size

Ceramic tile with bulged particle effect and preparation method of ceramic tile

ActiveCN104016728ARich colors and patternsgood uniformity
Owner:MONALISA GRP CO LTD

Preparation method of nano zinc oxide

PendingCN112340767ASmall average particle sizeLarge specific surface area
Owner:安徽泰龙锌业有限责任公司

Ultrasonic micro-reactor preparation method of nano-drug

PendingCN112691625ASmall average particle sizegood monodispersity
Owner:DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products