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NANO silver collosol preparing method

A technology of nano-silver sol and silver-ammonia solution, which is applied in the direction of nanotechnology to achieve excellent stability, ensure application safety, and high efficiency

Active Publication Date: 2014-11-19
GUANGXI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no relevant report on the use of polylysine as a reducing agent and stabilizer for the preparation of nano-silver sol

Method used

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  • NANO silver collosol preparing method
  • NANO silver collosol preparing method
  • NANO silver collosol preparing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Get 0.1g polylysine and dissolve it in 100ml deionized water to obtain a polylysine aqueous solution with a mass percentage of 0.1%;

[0020] Prepare a 1mol / L silver nitrate solution, then add dropwise ammonia water with a concentration of 20% until the initial precipitate is just dissolved (ammonia water is not too much), to obtain a silver ammonia solution, dilute to a mass molar concentration of 0.05mol / L;

[0021] Add 1ml of silver ammonia solution with a mass molar concentration of 0.05mol / L dropwise into 50ml of a polylysine aqueous solution with a mass percent concentration of 0.1%, adjust the pH to 11, and stir and react at 80°C for 60min to obtain brown-yellow silver nanoparticles Sol, wherein the particle size of nano-silver is 10-30nm. Test the UV-Vis spectrum after diluting the prepared nano-silver sol, the results are as follows: figure 1 Shown; Nano-silver sol has an obvious strong absorption peak at 420nm, and this absorption peak is produced by nano-sil...

Embodiment 2

[0023] Get 0.5g polylysine and dissolve it in 100ml deionized water to obtain a polylysine aqueous solution with a mass percentage of 0.5%;

[0024] Prepare a 1mol / L silver nitrate solution, and then add dropwise ethylenediamine with a concentration of 10% until the initial precipitate is just dissolved (the ethylenediamine is not too much) to obtain a silver ammonia solution, which is diluted to a mass molar concentration of 0.1mol / L L;

[0025] Add 1 ml of silver ammonia solution with a mass molar concentration of 0.1 mol / L dropwise into 30 ml of a polylysine aqueous solution with a mass percent concentration of 0.5%, adjust the pH to 12, and stir and react at 60°C for 120 minutes to obtain brown nano-silver Sol, wherein the particle size of nano-silver is 10-30nm.

Embodiment 3

[0027] Get 0.1g polylysine and dissolve it in 100ml deionized water to obtain a polylysine aqueous solution with a mass percentage of 0.1%;

[0028] Prepare a 1mol / L silver nitrate solution, then add dropwise diethylenetriamine with a concentration of 10% until the initial precipitate disappears (diethylenetriamine is not excessive), and obtain a silver ammonia solution, which is diluted to a mass molar concentration of 0.01mol / L;

[0029] Add 1ml of silver ammonia solution with a mass molar concentration of 0.01mol / L dropwise into 50ml of a polylysine aqueous solution with a mass percentage concentration of 0.1%, adjust the pH to 11.5, and stir and react at 100°C for 30min to obtain a nano-silver sol. The sol is yellow. image 3 It is the TEM picture of nano-silver. It can be seen from the figure that the nano-silver particles are basically spherical in structure, with a particle size of about 20-30nm. The nano-silver particles are evenly dispersed without agglomeration.

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Abstract

The invention discloses a nano silver collosol preparing method and belongs to the technical field of nano materials. According to the technical scheme, the method includes mixing silver nitrate solution or silver ammonia solution with the mass molar concentration ranging from 0.01 to 1mol / L with poly lysine aqueous with the mass percentage ranging from 0.1% to 1%, at the volume ratio ranging from 1: 10 to 1: 50; stirring and reacting for 30 to 180 min on the condition of temperature of 50 to 100 DEG C, and obtaining the nano silver collosol with the grain diameter ranging from 10 to 100 nm. The preparation process meets the rules that safer reaction reagents and reaction conditions advocated by 'green chemistry', the poly lysine free of harm and toxic services as reducing agent and stabilizer for preparing nano silver, the water services as reaction medium, the preparation process is simple, and the method is safe and environment-friendly.

Description

technical field [0001] The invention relates to a preparation method of nanometer silver sol, which belongs to the field of nanotechnology. Background technique [0002] Silver is a safe and broad-spectrum antibacterial material. After being nano-sized, its antibacterial effect not only has the surface effect and small size effect of nanomaterials, but also has the unique characteristics of silver such as antibacterial and catalytic. Very little nano-silver can produce It has a strong bactericidal effect and has a wide range of applications in the fields of biology, medical and health, catalysis, food packaging and preservation, plastics and textile finishing. The preparation methods of nano-silver include physical and chemical methods, among which chemical methods include sol-gel method, electroplating method, redox method and microemulsion method. When preparing nano-silver chemically, it is necessary to select a suitable reducing agent to reduce silver ions to nano-sized...

Claims

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Application Information

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IPC IPC(8): B22F9/24B82Y40/00
Inventor 岳新霞蒋芳黄继伟
Owner GUANGXI UNIVERSITY OF TECHNOLOGY
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