Method for preparing Nano silver sol

A nano-silver sol and nano-silver technology are applied in the field of preparation of nano-silver sol, which can solve problems such as residual chemical toxic substances, and achieve the effects of good antibacterial and antiviral activity, less dosage and uniform distribution.

Inactive Publication Date: 2008-09-03
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a preparation method of nano-silver sol, adopting this method can obtain a kind of nano-silver sol with stable shape, uniform dispersion and smaller particle size; meanwhile, the method can conveniently control the particle size of nano-silver sol , no need to introduce protective agent, can overcome the complex preparation process of microemulsion method, and the shortcomings of residual chemical and toxic substances in nano-silver sol

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A formulation of an inverse microemulsion is as follows:

[0031] components

component name

gram

oil phase

n-heptane

9

alkali

sodium hydroxide

0.25

water box

Silver nitrate aqueous solution or sodium borohydride aqueous solution

1

biosurfactant

rhamnolipid

3

co-surfactant

Butanol

6

[0032] The preparation method of nano silver is as follows:

[0033] Dissolve silver nitrate and sodium borohydride in deionized water respectively to prepare silver nitrate aqueous solution and 0.1mol / L sodium borohydride aqueous solution with concentrations of 0.1mol / L, respectively. Mix the mixture of biosurfactant and cosurfactant with silver nitrate aqueous solution and sodium borohydride aqueous solution at a mass ratio of 9:1, and then add oil equivalent in quality to the mixture of biosurfactant and cosurfactant phase, respectively prepared mi...

Embodiment 2

[0035] A formulation of an inverse microemulsion is as follows:

[0036] components

component name

gram

oil phase

Isooctane

4

alkali

Potassium hydroxide

0.09

water box

Silver nitrate aqueous solution or hydration trap aqueous solution

1

biosurfactant

Trehalolipid

1.33

co-surfactant

n-pentanol

2.66

[0037] The preparation method of nano silver is as follows:

[0038] Dissolve silver nitrate and hydration trap in deionized water respectively to prepare silver nitrate aqueous solution and 0.1 mol / L aqueous hydration trap solution with concentrations of 0.1 mol / L respectively. The mixture of biosurfactant and cosurfactant is mixed with silver nitrate aqueous solution and hydration trap aqueous solution at a mass ratio of 8:2, and then an oil phase equivalent in quality to the mixture of biosurfactant and cosurfactant is added , to prepare microemulsions containing silv...

Embodiment 3

[0040] A formulation of an inverse microemulsion is as follows:

[0041] components

component name

gram

oil phase

Cyclohexane

7

alkali

sodium hydroxide

0.20

water box

Silver nitrate aqueous solution or trisodium citrate aqueous solution

3

biosurfactant

Sophorolipids

2.33

[0042] co-surfactant

n-propanol

4.66

[0043] The preparation method of nano silver is as follows:

[0044] Dissolve silver nitrate and trisodium citrate in deionized water respectively to prepare 0.1 mol / L silver nitrate aqueous solution and 0.1 mol / L trisodium citrate aqueous solution. The mixture of biosurfactant and co-surfactant is mixed with silver nitrate aqueous solution and trisodium citrate aqueous solution with a mass ratio of 7: 3, and then add the equivalent mass of biosurfactant and co-surfactant mixture. In the oil phase, a microemulsion containing silver nitrate and a micr...

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Abstract

A process for preparing nano-Ag sol includes such steps as preparing the reverse-phase microemulsion from glucolipide-type surfactant, mixing the microemulsion containing reducer with the microemulsion containing silver nitrate while high-speed stirring, preparing Ag nanoparticles, demulsifying, separating, washing, and distributing them in nonpolar solvent. Its advantages are high stability and high antibacterial effect.

Description

technical field [0001] The invention relates to a preparation method of nanometer silver sol, in particular to a preparation method of nanometer silver sol which uses inverse microemulsion as a template and does not need to add any other protective agent. Background technique [0002] Nano-silver has been produced for nearly 30 years, and it has been extensively studied because of its excellent properties in many fields such as mechanics, heat, electricity, and optics. In recent years, with the gradual improvement of people's health needs, the antibacterial and antibacterial effects of silver have received widespread attention, and compared with ordinary silver, the antibacterial effect of nano-silver has produced a qualitative leap. Can produce a strong bactericidal effect. Although a variety of metal ions, such as mercury, lead, chromium, nickel, cobalt, copper, zinc, etc., have antibacterial effects, mercury, lead, and chromium have residual toxicity to the human body; n...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/00
Inventor 谢颖玮孙瑛叶汝强王世慧
Owner EAST CHINA UNIV OF SCI & TECH
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