A method for removing anions on the surface of nanometer metal powder

A technology of nanometer metal powder and anion, which is applied to the treatment of nanometer metal or submicron metal surface to remove anion on the surface of nanometer metal or submicron metal powder. , the effect of simple operation

Active Publication Date: 2017-03-08
GUANGDONG GUANGHUA SCI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When such nano-metal particles are used as a conductive material, when the hydroxide is decomposed to form a metal oxide, a large number of holes will be generated, which will seriously affect the conductivity.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) The nano-gold prepared by 0.05mol of gold chloride tetrahydrate by the liquid-phase reduction method is washed with pure water, centrifuged for 2 times, and the supernatant liquid is poured out to obtain wet nano-gold powder;

[0022] (2) Under the condition of stirring, the wet nano-gold powder was treated with ultrasonic waves with a power of 100W and a frequency of 1MHZ for 10min. Keep stirring and ultrasonic dispersion treatment. Add 0.4 g of ammonium bicarbonate. water, centrifuged to obtain wet nano-gold powder;

[0023] (3) After washing with pure water and centrifuging the wet nano-gold powder obtained in step (2) for 2 times, the pH of the supernatant liquid was measured with precision pH test paper to be 8.5, the washing was stopped, and the supernatant liquid was poured out to obtain a wet Nano gold powder;

[0024] (4) Using the stirring in step (2) and ultrasonic waves with the same power and frequency, disperse the wet nano-gold powder obtained in ste...

Embodiment 2

[0027] (1) The nano-copper prepared by 0.05mol copper sulfate pentahydrate by the liquid-phase reduction method is washed with pure water, centrifuged for 2 times, and the supernatant is poured out to obtain wet nano-copper powder;

[0028] (2) Under the condition of stirring, the wet nano-copper powder was treated with ultrasonic waves with a power of 200W and a frequency of 500KHZ for 20min. Keep stirring and ultrasonic dispersion treatment. Add 0.6 g of ammonium bicarbonate. Pure water, centrifuged to obtain wet nano copper powder;

[0029] (3) After washing with pure water and centrifuging the wet nano copper powder obtained in step (2) for 3 times, the pH of the supernatant liquid was measured with a precision pH test paper to be 9, the washing was stopped, and the supernatant liquid was poured out to obtain the wet nano copper powder. copper powder;

[0030] (4) Disperse the wet nano-copper powder obtained in step (3) by using the stirring in step (2) and ultrasonic wav...

Embodiment 3

[0033] (1) The nano-silver prepared by the liquid-phase reduction method of 0.05mol silver nitrate is washed with pure water, centrifuged for 2 times, and the supernatant liquid is poured out to obtain wet nano-silver powder;

[0034] (2) Under the condition of stirring, the wet nano-silver powder was treated with ultrasonic waves with a power of 200W and a frequency of 1MHZ for 15min. Keep stirring and ultrasonic dispersion treatment. Add 0.5 g of ammonium bisulfite. Pure water, centrifuged to obtain wet nano-silver powder;

[0035] (3) After washing with pure water and centrifuging the wet nano-silver powder obtained in step (2) for 2 times, the pH of the supernatant liquid was measured with a precision pH test paper to be 8, the washing was stopped, the supernatant liquid was poured out, and the nano-silver powder was obtained. use;

[0036] (4) Disperse the wet nano-copper powder obtained in step (3) by using the stirring and ultrasonic waves of the same power and frequen...

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Abstract

The invention provides a method for removing nano-metal powder surface anions. The method comprises the steps that 1, nano-metal powder obtained through a liquid phase reduction method is washed with pure water and centrifugally separated 2-3 times; 2, ultrasonic waves with the certain power and frequency are used for processing the wet nano-metal powder for 15-30 min with stirring, and the processed wet nano-metal powder is added with ammonium bicarbonate or ammonium hydrogen sulfite, then sufficiently stirred, processed in an ultrasonic mode, added with pure water and centrifugally separated; 3, the wet nano-metal powder is washed with pure water and centrifugally separated, washing is stopped after the pH value of supernatant liquid is measured to be smaller than or equal to 9, and the supernatant liquid is poured out; 4, mercaptan is added under the effect of stirring and ultrasonic waves, and stirring and ultrasonic processing continue to be carried out for 15-60 min, then, pure water is added, and centrifugal separation is carried out after sufficient stirring and ultrasonic wave decentralized processing; and 5, the nano-metal powder is washed with organic solution, centrifugally separated 2-3 times, then placed into a high-temperature hydrogen reduction furnace, added with hydrogen and dried at 200-300 DEG C, thereby forming the needed product. According to the method, the design is reasonable, technological conditions are moderate and operation is easy. The anion adsorption amount of the nano-metal powder processed by the method is greatly reduced.

Description

technical field [0001] The invention relates to a method for treating the surface of nanometer materials, in particular to a method for treating the surface of nanometer metal or submicron metal, and more particularly to a method for removing anions on the surface of nanometer metal or submicron metal powder. Background technique [0002] The research of nanomaterials has become a hot spot in the field of materials research at this stage. Nanomaterials become ultrafine particle materials, which are materials with at least one dimension in the nanoscale range (1-100nm, 0.1-100nm in engineering) on ​​the three-dimensional scale, or as a basic structural unit. Due to their large specific surface area, good electrical conductivity and chemical activity, nano-metal particles are widely used in powder metallurgy, magnetic materials, conductive pastes, battery materials, catalysts and other fields. [0003] There are various preparation methods of nano metal particles, which are m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/00B22F9/16B82Y30/00B82Y40/00
Inventor 何为张毅王守绪谭泽陈国琴
Owner GUANGDONG GUANGHUA SCI TECH
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