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Preparation method for oil-phase silver nanoparticles

A technology of silver nanoparticles and oil phase, which is applied in the field of preparation of oil phase silver nanoparticles, can solve the problems of high production cost and poor solubility of silver salt, and achieve the effects of low production cost, narrow particle size distribution and high purity

Active Publication Date: 2015-12-09
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this invention uses organic silver salts as raw materials, so the production cost is too high, and the solubility of silver salts in solvents is poor; in addition, the reaction temperature of 110-120 ° C also brings certain difficulties to the amplification process

Method used

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  • Preparation method for oil-phase silver nanoparticles
  • Preparation method for oil-phase silver nanoparticles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Take by weighing 20.4g sodium stearate and be dissolved in the mixed solution of 800mL water, ethanol, cyclohexane, control the mass ratio of water, ethanol, cyclohexane to be 1:1.18:0.17;

[0048]Turn on the supergravity rotation device and adjust the rotation speed to 1200rpm;

[0049] Turn on the feed pump to transport the microemulsion to the rotating bed;

[0050] Add successively the silver nitrate aqueous solution of 60mL0.2mol / L, the hydrazine hydrate aqueous solution of 60mL8.16mol / L and carry out reduction reaction, and the feeding rate of controlling silver salt solution and reducing agent solution is 6mL / min, the temperature of control reaction system is 50°C, the reaction time is 5 minutes; after the reaction is completed, the nano-silver microemulsion obtained from the reaction flows out of the supergravity rotating device, and then close the supergravity rotating device;

[0051] Add hexanaphthene in reaction liquid, leave standstill after stirring;

[...

Embodiment 2

[0060] Take by weighing 30.6g sodium stearate and be dissolved in the mixed solution of 1000mL water, ethanol, cyclohexane, control the mass ratio of water, ethanol, cyclohexane to be 1:1.58:0.14;

[0061] Turn on the high-gravity rotating device and adjust the speed to 800rpm; turn on the feed pump and transport the microemulsion to the rotating bed; add 50mL of 0.45mol / L silver nitrate ethanol solution and 50mL of 9.24mol / L hydrazine hydrate ethanol solution for reduction React, and control the feed rate of silver salt solution and reducing agent solution to be 10mL / min, control the temperature of the reaction system to be 25°C, and the reaction time to be 10min; After installation, turn off the hypergravity spinner

[0062] Add hexanaphthene in reaction liquid, leave standstill after stirring;

[0063] Add absolute ethanol to the dispersed solution, centrifuge and wash, and disperse in cyclohexane again to obtain nano silver dispersion.

[0064] The product is dark red, a...

Embodiment 3

[0066] Weigh 70.6g sodium oleate and dissolve in 780mL water, ethanol, n-hexane mixed solution, control the mass ratio of water, ethanol, n-hexane to be 1:1.1:0.14;

[0067] Turn on the high-gravity rotating device and adjust the speed to 1500rpm; turn on the feed pump and transport the microemulsion to the rotating bed; add 40mL of 0.45mol / L silver nitrite ethanol solution and 60mL of 8.06mol / L sodium borohydride aqueous solution in sequence Reduction reaction, and control the feed rate of silver salt solution and reducing agent solution to be 20mL / min, control the temperature of the reaction system to be 0°C, and the reaction time to be 15min; After spinning the device, turn off the hypergravity rotation device;

[0068] Add n-hexane to the reaction solution, stir and let stand;

[0069] Add anhydrous methanol into the dispersed solution, centrifuge and wash, and disperse in n-hexane again to obtain nano silver dispersion.

[0070] The product is dark red, and there is no ...

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Abstract

The invention discloses a preparation method for oil-phase silver nanoparticles. Micromolecule alcohol, water, a non-polar solvent and a surface active agent are mixed to obtain a uniform solution; inorganic silver salt is dissolved into water or an organic solvent to obtain a silver salt solution; a reducing agent is dissolved into water or an organic solvent to obtain a reducing agent solution; the obtained uniform solution, the obtained silver salt solution and the obtained reducing agent solution are added into an over-gravity rotary bed reactor for reacting, and a nano-silver microemulsion is obtained; and the non-polar solvent is added into the nano-silver microemulsion, and the oil-phase silver nanoparticles are obtained. The silver nanoparticles are small in grain size, narrow in granularity distribution, good in oil phase dispersibility and free of sedimentation after standing is carried out for more than three months.

Description

technical field [0001] The invention relates to the field of preparation of metal nanoparticles, in particular to a preparation method of oil-phase silver nanoparticles. Background technique [0002] Nanomaterials have the characteristics of large specific surface area and high surface energy, and are prone to aggregation during storage and application, which greatly limits their later application. Traditionally, nanomaterials have been surface-modified before being added to the application matrix. However, the nanoparticles obtained by such methods have a large particle size and uneven distribution, poor dispersion, and poor compatibility with matrix materials. [0003] Nanomaterial dispersion is a new application form of nanomaterials, which has natural advantages. Its dispersion avoids the agglomeration phenomenon that easily occurs between nanomaterial particles, improves the transparency and stability of materials, and improves the particle size. The catalytic activit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B82Y40/00
Inventor 陈建峰武瑞曾晓飞王洁欣
Owner BEIJING UNIV OF CHEM TECH
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