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Electrolytic emulsifying method for grain size controllable copper, silver and etc. ultrafine metal powder

A technology of metal powder and ultrafine powder, which is applied in the field of ultrafine metal powder materials, can solve the problems of collision probability of microemulsion particles, negative impact of nanoparticle uniformity, harm to human body and natural environment, etc., to reduce impurities and oxide content, suitable for industrial production, and resistant to storage and transportation

Inactive Publication Date: 2010-09-01
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process method has the following disadvantages: 1. High production cost; 2. The particle size distribution of the powder is relatively wide; 3. The process is relatively complicated; 4. The highly toxic chemical reagent-hydration trap is used, which causes great harm to the human body and the environment
Its shortcomings are caused by the following reasons. The preparation of nano-powder by microemulsion method requires a large amount of surfactants and alcohols, and it is not easy to recycle, resulting in a significant increase in powder production costs.
From the perspective of preparation principle, the principle of microemulsion method to prepare nano powder mainly relies on the collision of microemulsion particles for material exchange, which promotes the occurrence and progress of the reaction, so as to prepare nano powder. It can be seen that the biggest defect of this method is the microemulsion. There is a probability problem in the collision of milk particles, which will have an inevitable negative impact on the uniformity of nanoparticles
In terms of environmental protection, the introduction of highly toxic reagents - hydration traps will bring certain harm to the human body and the natural environment

Method used

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  • Electrolytic emulsifying method for grain size controllable copper, silver and etc. ultrafine metal powder
  • Electrolytic emulsifying method for grain size controllable copper, silver and etc. ultrafine metal powder
  • Electrolytic emulsifying method for grain size controllable copper, silver and etc. ultrafine metal powder

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0016] Example 1. Electrolytic emulsification method to prepare ultrafine copper powder with controllable particle size.

[0017] Weigh 160g of anhydrous copper sulfate, dissolve it in 10L of deionized water, and prepare it to a concentration of 0.1mol L -1 Inject the copper sulfate solution into the "electromagnetic stirring ultrasonic mixing tank", turn on the electromagnetic stirrer, and stir at room temperature for 10 minutes to completely dissolve the anhydrous copper sulfate in water; add 7 mL of organic oil dropwise, the introduction frequency is 60%, and the power is Use 260W ultrasonic wave to ultrasonicate the solution for 4 minutes, so that the organic oil can be fully dissolved in deionized water to form an emulsion. Utilize the "Ultrafine Powder Preparation Workstation" to make powder. Inject the prepared emulsified precursor solution into five electrolytic cells on average, adjust the pH value of each electrolytic cell to 2.0 with sulfuric acid, use pure copper ...

example 2

[0019] Example 2. The electrolytic emulsification method prepares ultra-fine silver powder with controllable particle size.

[0020] Weigh 17g of silver nitrate, dissolve it in 10L deionized water, and prepare 0.01mol L -1 Silver nitrate solution, 7mL of organic oil was added dropwise, and an emulsion was prepared in the "electromagnetic stirring ultrasonic mixing box". Inject the prepared emulsified precursor solution into the five electrolytic cells in the "Ultrafine Powder Preparation Workstation", adjust the pH value of each electrolytic cell to 3.0 with nitric acid, use pure silver as the anode and platinum as the cathode, and connect the external equipment Power supply, when the current intensity is 0.5A, the current density is about 0.15A·cm -2Under the conditions of electrolysis for 15 minutes, stop electrolysis, it can be seen that a large amount of powder is adsorbed on the surface of the cathode. Put the generated powder in ethanol (industrial grade) for desorptio...

example 3

[0022] Example 3. Preparation of superfine zinc powder with controllable particle size by electrolytic emulsification method.

[0023] Weigh 100g of zinc chloride, dissolve it in 10L deionized water, and prepare 0.1mol·L -1 Add 6mL of organic oil dropwise to the zinc chloride solution, and prepare an emulsion in the "electromagnetic stirring ultrasonic mixing box". Use the "ultrafine powder preparation workstation" to make powder, adjust the pH value of each electrolytic cell to 3.0 with hydrochloric acid, use pure zinc as the anode, and the mesh nickel-based electrode piece as the cathode, apply an external electric field, at a current intensity of 20A, Current density about 0.2A·cm -2 Under the conditions of electrolysis for 15 minutes, stop electrolysis, it can be seen that a large amount of powder is adsorbed on the surface of the cathode. Put the powder adsorbed on the surface of the cathode in ethanol (industrial grade) for desorption, rinse twice with deionized water,...

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Abstract

This invention discloses an ultra-fine metal powder preparation method whose grain radical can be controlled, that is electrolytic emulsion method. This invention is fit for large industrial production. The character of this invention as follows: firstly, using agnetic disturbing ultrasonic fluid mixing bo

Description

technical field [0001] The invention relates to a process method for preparing ultrafine metal powder with controllable particle size——electrolytic emulsification method, which can be used to prepare ultrafine metal powders such as ultrafine copper, silver, zinc, iron, nickel, etc. Material. [0002] Due to its extremely fine grains, a large number of atoms in grain boundaries and defect centers in grains, as well as its own surface effects, volume effects, small size effects and macroscopic tunnel effects, ultrafine metal powder materials make it compatible with Compared with coarse-grained materials, it has many specific properties in catalysis, optics, mechanics, magnetism, etc., and is known as "the most promising material in the 21st century". Show broad application prospects. Background technique [0003] In the past ten years, a variety of physical and chemical methods for preparing nanoparticles have been developed. Nanoparticles with high purity can be obtained b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25C5/02B22F9/18
Inventor 蒋渝李淼喻建胜涂铭旌
Owner SICHUAN UNIV
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