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Method for preparing stable nano-silver

A nano-silver and stable technology, applied in the direction of nanotechnology, can solve the problems of reducing agent or additive toxicity, uneven particle size, slow preparation speed, etc., and achieve uniform and stable size, simple preparation process and fast preparation speed.

Inactive Publication Date: 2014-04-30
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods all have varying degrees of operational or practical difficulties, such as the toxicity of reducing agents or additives, uneven particle size, high equipment requirements, cumbersome processes, slow preparation speeds, and high costs.

Method used

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  • Method for preparing stable nano-silver
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  • Method for preparing stable nano-silver

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Take the preparation of chitosan-grafted polycaprolactone copolymer micelle aqueous solution as a stabilizer for nano-silver particles as an example. First, 10 mg of chitosan-g-poly(ε-caprolactone) graft copolymer (source? Molecular weight of chitosan and poly(ε-caprolactone) before and after grafting? Grafting rate? Self-made , mentioned above; the molecular weight of chitosan before grafting is 1.03×10 5 , the molecular weight of polycaprolactone is 2000, and the grafting rate is 29%. The same parameters are used for the copolymers and their derivative micelles mentioned later) into 10mL deionized water, and ultrasonic 3 times at 300W power, each 30 seconds each time, with an interval of 30 seconds, to form copolymer micelles with a concentration of 1 mg / mL. Then the copolymer micelles were compounded with silver nitrate aqueous solution, the compounding molar ratio was 1:1, and the radiation time was 20 minutes as an example. Quickly add silver nitrate aqueous solu...

Embodiment 2

[0036] Take the preparation of chitosan-grafted polycaprolactone copolymer micelle aqueous solution as a stabilizer for nano-silver particles as an example. First, 10 mg of chitosan-g-poly(ε-caprolactone) graft copolymer was dissolved in tetrahydrofuran solvent, and after being dissolved, it was slowly added dropwise to 10 mL of deionized water, and evaporated overnight to form a copolymer with a concentration of 1 mg / mL. micelles. Then the copolymer micelles were compounded with silver nitrate aqueous solution at a compounding ratio of 2:1. Silver nitrate aqueous solution (10mg / mL, dosage: 50μL) was quickly added dropwise to the copolymer micelle solution, and after a period of rapid stirring, it was irradiated under a mercury lamp (500W) with a wavelength of 365nm ultraviolet light for 15 minutes to complete the nano-silver solution. preparation.

Embodiment 3

[0038] Take the preparation of chitosan-grafted polycaprolactone copolymer micelle aqueous solution as a stabilizer for nano-silver particles as an example. First, 10 mg of chitosan-g-poly(ε-caprolactone) graft copolymer was dissolved in dimethyl sulfoxide solvent, and after dissolving, it was slowly added dropwise to 10 mL of deionized water, and after dialysis, it was mixed with silver nitrate Aqueous solution composite, composite ratio 1:2. Silver nitrate aqueous solution (10 mg / mL, dosage: 200 μL) was quickly added dropwise to the copolymer micelle solution, and then stirred rapidly for a period of time, and then irradiated under a mercury lamp (500 W) with a wavelength of 365 nm ultraviolet light for 20 minutes.

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Abstract

The invention provides a method for preparing stable nano-silver. The method comprises the steps that micelle of amphiphilic chitosan and polycaprolactone crafted copolymer or a derivative of the amphiphilic chitosan and polycaprolactone crafted copolymer serves as a stabilizer, and the stable nano-silver is obtained. The method for preparing the stable nano-silver has the advantages that formed silver nanoparticles of a good three-dimensional area center structure are evenly distributed and are uniform and stable in size, and not any reducing agents or complex methods are used in the preparation method of the nano-silver, so that repeatability is good. Compared with other micelle type stabilizers, the preparation process of a raw material and micelle aqueous solution of the raw material are simple, the material itself is non-toxic, small in use amount and fast in preparation speed. Compared with other existing preparation technologies, the method is convenient to operate, simple in process and fast in preparation speed. In addition, equipment is conventional, and irradiation time is short.

Description

technical field [0001] The invention relates to a simple and environment-friendly preparation method for stable nano-silver, in particular to a method for preparing stable nano-silver by using micelles as a stabilizer. Background technique [0002] When the size of metal particles is reduced to the nanometer level, it will show unique optical, thermal, mechanical and electromagnetic effects, so it has been widely studied in various fields such as catalysis and antibacterial. Because emerging effects are usually related to the shape and size of nanoparticles, the formation of nanoparticles with stable structure and size becomes the key to the preparation of nanomaterials. At present, the methods for preparing metal nanoparticles are mainly divided into two types, namely physical methods and chemical methods. Physical methods mainly use techniques such as laser ablation, evaporation / condensation, visible light or ultraviolet radiation, while chemical methods are mainly obtain...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B82Y40/00
Inventor 郎美东顾春华
Owner EAST CHINA UNIV OF SCI & TECH
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