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A preparation method of surface-modified core-shell structure cusio2 nanoparticles

A core-shell structure and nanoparticle technology is applied in the field of preparation of nanocomposite materials, which can solve the problems of nanoscale copper powder being easily oxidized and disperse, restricting applications, etc., and achieve good organic dispersibility, prevent oxidation, and expand application fields. Effect

Active Publication Date: 2015-08-19
河南海博瑞硅材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, nanoscale copper powder is easily oxidized in air and poorly dispersed in organic solvents, which limits its application in more fields.

Method used

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  • A preparation method of surface-modified core-shell structure cusio2 nanoparticles
  • A preparation method of surface-modified core-shell structure cusio2 nanoparticles
  • A preparation method of surface-modified core-shell structure cusio2 nanoparticles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Weigh 12.5g of copper sulfate pentahydrate in 60mL of deionized water, add concentrated ammonia water to make the pH of the solution about 7 after the dissolution is complete, transfer the resulting solution to a 250mL three-neck flask, stir and heat with magnetic force, take 4.8g of sodium borohydride and add Dilute with 44mL deionized water, when the temperature of the system is constant at 40°C, add sodium borohydride solution dropwise, stir for 30 minutes, then add 2.08g of tetraethyl orthosilicate (TEOS) to it, continue to stir and react at 40°C for 2h; 1h, remove 100mL of supernatant, then add modifier KH570 (γ-(methacryloyloxy)propyltrimethoxysilane) in molar ratio, modifier: ethyl orthosilicate = 1:3, stir at 60°C After reacting for 10 hours, the surface-modified CuSiO with core-shell structure was obtained. 2 Nanoparticle emulsion; the obtained emulsion is suction-filtered, washed with water to remove by-products, and then dried to obtain surface-modified c...

Embodiment 2

[0027] Weigh 12.4g of copper nitrate trihydrate in 60mL of deionized water, and dissolve sodium hydroxide to make the pH of the solution about 9. Transfer the resulting solution to a 250mL three-neck flask, stir and heat with magnetic force, and add 8mL of hydrazine hydrate to 44mL Dilute with deionized water; when the temperature of the system is constant at 50°C, add hydrazine hydrate solution dropwise, stir for 10 minutes, then add 2.4g of silica sol, continue stirring and reacting at 50°C for 2h; let stand for 1h, remove 100mL of the supernatant, Then add the modifier (hexamethyldisilazane) according to the molar ratio, modifier: silica sol = 1:6, and stir and react at 30°C for 24 hours to obtain the surface-modified core-shell structure CuSiO 2 Nanoparticle emulsion; the above obtained emulsion is suction filtered, washed with water to remove by-products, and then dried to obtain surface-modified core-shell structure CuSiO 2 Nanoparticles, the mass is 3.6g.

Embodiment 3

[0029] Weigh 4.9g of copper hydroxide in 60mL of deionized water, add potassium hydroxide to make the pH of the solution about 10, transfer the resulting solution to a 250mL three-neck flask, stir and heat with magnetic force, take 4mL of hydrazine hydrate and add 44mL of deionized water to dilute , when the temperature of the system is constant at 25°C, add hydrazine hydrate solution and stir for 10 hours; remove 100mL of the supernatant after standing and layering, add 3.04g of orthosilicate methyl ester (TMOS) to it, and continue stirring at 30°C for reaction 1h; then add the modifier KH151 (vinyltriethoxysilane) according to the molar ratio, modifying agent: methyl orthosilicate = 1:3, stir and react at 60°C for 1h, then raise the temperature to 80°C and continue the reaction for 2h to obtain the surface Modified core-shell CuSiO 2 Nanoparticle emulsion; the above obtained emulsion is suction filtered, washed with water to remove by-products, and then dried to obtain surfa...

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Abstract

The invention belongs to the technical field of nano composite material preparation, and particularly relates to a method for preparing surface modified Cu@SiO2 nano particles adopting shell structures. The method comprises the following steps: 1), preparing liquid reactant containing nano copper shells; 2), preparing liquid reactant of the Cu@SiO2 nano particles adopting the shell structures; 3), preparing emulsion of the surface modified Cu@SiO2 nano particles adopting the shell structures; 4) carrying out post-processing to obtain the surface modified Cu@SiO2 nano particles adopting the shell structures. As a certain quantity of modifier is added during the preparation process of the composite Cu@SiO2 nano particles adopting the shell structures for surface modification, and the surfaces of the Cu@SiO2 nano particles are grafted with organic functional groups during a silanization process, the surface modified Cu@SiO2 nano particles have favorable organic dispersity.

Description

technical field [0001] The invention belongs to the technical field of preparation of nanocomposite materials, in particular to a surface-modified core-shell structure CuSiO 2 Preparation method of nanoparticles. Background technique [0002] Noble metal nanoparticles exhibit many excellent properties, such as high electrical conductivity, thermal conductivity, surface plasmon resonance, etc., which make them have a wide range of application values ​​in catalysis, antibacterial, and microelectronics, but their high price limits the scope of their applications. . Copper nanoparticles have the excellent characteristics of noble metals, and compared with noble metal gold nanoparticles and silver nanoparticles, nano-copper has a lower material cost, so more and more people begin to apply different methods to study the synthesis of nano-copper . However, due to the problems such as easy oxidation of nano-sized copper powder in air and poor dispersion in organic solvents, i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24
Inventor 李小红盛二威张治军
Owner 河南海博瑞硅材料科技有限公司
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