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Preparing method of TiO2 (titanium dioxide) coated nanometer nickel powder

A nano-nickel powder, titanium dioxide technology, applied in nanotechnology, liquid chemical plating, coating and other directions, can solve the problems of a large number of organic solvents, cumbersome operation, poor coating effect, etc., to achieve good coating effect and uniform coating , the effect of easy operation

Active Publication Date: 2014-09-24
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] (1) A variety of additives are added during the preparation process, the operation is cumbersome and the coating effect is poor
[0008] (2) The reaction process requires a large amount of organic solvents, which pollutes the environment
[0009] (3) The product is not easy to separate and the purity i

Method used

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  • Preparing method of TiO2 (titanium dioxide) coated nanometer nickel powder
  • Preparing method of TiO2 (titanium dioxide) coated nanometer nickel powder
  • Preparing method of TiO2 (titanium dioxide) coated nanometer nickel powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Removal of oxide layer on the surface of nano-nickel powder

[0049] Add 30 parts of dilute hydrochloric acid (6mol / L) and 5 parts of nano-nickel powder to a 100ml beaker, ultrasonically shake for 1 hour, then centrifuge, wash with deionized water until the pH value is 6-7, and finally vacuum-dry at 50°C for 8 hours Obtain nano nickel powder.

[0050] Nano nickel powder surface pretreatment

[0051]Add 2 parts of nickel powder, 40 parts of ethanol and 0.1 part of silane coupling agent KH590 into a 100ml three-necked flask with a stirring paddle and a thermometer. After ultrasonic dispersion for 0.5h, place the three-necked flask in a 30°C oil bath and stir at high speed for 5 Hours, after the reaction is over, high-speed centrifugation and washing with absolute ethanol for 3-5 times, and finally vacuum-dried at 50°C for 4 hours and ground to powder to obtain pretreated nano-nickel powder;

[0052] Titanium dioxide coated nickel powder

[0053] Take 0.3 parts of pretr...

Embodiment 2

[0058] Removal of oxide layer on the surface of nanometer nickel powder

[0059] Add 48 parts of dilute hydrochloric acid (6mol / L) and 8 parts of nano-nickel powder to a 100ml beaker, ultrasonically shake for 2 hours, then centrifuge, wash with deionized water until the pH value is 6-7, and finally vacuum-dry at 50°C for 4 hours Obtain nano nickel powder.

[0060] Nano nickel powder surface pretreatment

[0061] Add 1 part of nickel powder, 20 parts of ethanol and 0.05 part of silane coupling agent KH550 into a 100ml three-necked flask with a stirring paddle and a thermometer. After ultrasonic dispersion for 15 minutes, place the three-necked flask in a 35°C oil bath and stir at high speed for 2 Hours, after the reaction is over, high-speed centrifugation and washing with absolute ethanol for 3-5 times, and finally vacuum-dried at 40°C for 4 hours and ground to powder to obtain pretreated nano-nickel powder;

[0062] Titanium dioxide coated nickel powder

[0063] Take 1 par...

Embodiment 3

[0065] Removal of oxide layer on the surface of nanometer nickel powder

[0066] Add 60 parts of dilute hydrochloric acid (6mol / L) and 10 parts of nano-nickel powder to a 100ml beaker, ultrasonically shake for 1.5h, then centrifuge, wash with deionized water until the pH value is 6-7, and finally vacuum dry at 40°C 5h to obtain nano-nickel powder.

[0067] Nano nickel powder surface pretreatment

[0068] Add 0.8 parts of nickel powder, 16 parts of ethanol and 0.08 parts of silane coupling agent KH590 to a 100ml three-necked flask equipped with a stirring paddle and a thermometer. After ultrasonic dispersion for 20 minutes, place the three-necked flask in a 40°C oil bath and stir at a high speed for 7 Hours, after the reaction is over, high-speed centrifugation and washing with absolute ethanol for 3-5 times, and finally vacuum-dried at 40°C for 5 hours and ground to powder to obtain pretreated nano-nickel powder;

[0069] Titanium dioxide coated nickel powder

[0070] Take ...

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Abstract

The invention relates to a preparing method of TiO2 (titanium dioxide) coated nanometer nickel powder. The preparing method is realized through the following technical scheme that prepared diluted hydrochloric acid is mixed with nanometer nickel powder; the mixture is subjected to ultrasonic oscillation; then, still standing is carried out; supernatant liquid is poured; nanometer nickel powder after oxide layer removal is obtained after processing; the nanometer nickel powder after the oxide layer removal is mixed with silane coupling agents and the like; ultrasonic dispersion is carried out; in addition, the temperature is raised, and the mixture is stirred for reaction; after the reaction is completed, processing is carried out to obtain pre-processed nanometer nickel powder; an ethanol dispersion solution of the pre-processed nanometer nickel powder is mixed with deionized water and hydrochloric acid, then, the temperature rises, and a butyl titanate and ethanol mixed solution is added in a dropwise manner under mechanical stirring; reaction products are subjected to post-processing, and TiO2 coated particles with different coated layer thickness and different particle conductivities are obtained. The preparing method has the characteristics that the reaction operation is simple, the condition is mild, the reaction temperature is low, the products can be easily separated, the purification is convenient, the reaction yield is high, hardly no byproducts are generated, and the like.

Description

technical field [0001] The invention belongs to the field of composite materials, in particular to a preparation method of titanium dioxide-coated nano-nickel powder. Background technique [0002] Nano-metal nickel powder has a strong surface effect, which plays an important role in improving the efficiency of catalytic reactions, optimizing reaction pathways, and increasing reaction speed, especially in the military field. When the nano-nickel powder is directly applied in the organic medium, due to the high surface energy of the particles, it is in a thermodynamically unstable state, and it is easy to aggregate into agglomerates, and the surface of the nano-nickel powder is hydrophilic and oleophobic, showing strong polarity, and it is difficult to uniform in the organic medium. Dispersion, which affects the practical application effect of nanoparticles. Nano-titanium dioxide is also widely used due to its unique anti-ultraviolet ability. It is of great significance to u...

Claims

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Application Information

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IPC IPC(8): B22F1/02C23C18/12B82Y40/00
Inventor 肖正刚田翠华
Owner NANJING UNIV OF SCI & TECH
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