Method for removing nano-metal powder surface anions

A technology of nano metal powder and anion, applied in the treatment of nano metal or submicron metal surface, removing anions on the surface of nano metal or submicron metal powder, can solve problems such as affecting conductivity, reduce re-adsorption, process conditions Warm, easy-to-use effects

Active Publication Date: 2015-10-21
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) 0.05mol of gold chloride tetrahydrate was prepared by liquid-phase reduction of gold nanoparticles, washed with pure water, centrifuged twice, and the supernatant liquid was poured off to obtain wet nano-gold powder;

[0022] (2) Under the condition of stirring, treat the wet nano-gold powder with a power of 100W and a frequency of 1MHZ for 10 minutes, keep stirring and ultrasonic dispersion treatment, add 0.4 g of ammonium bicarbonate, fully stir and ultrasonic treatment for 20 minutes, add an appropriate amount of pure Water, centrifuged to obtain wet nano-gold powder;

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

[0024] (4) Use the stirring in step (2) and ultrasonic waves with the same power and frequency to disperse the ...

Embodiment 2

[0027] (1) Wash the nano-copper prepared by 0.05mol copper sulfate pentahydrate through the liquid phase reduction method, wash with pure water, and centrifuge twice, and pour off the supernatant to obtain wet nano-copper powder;

[0028] (2) Under the condition of stirring, use a power of 200W and a frequency of 500KHZ to ultrasonically treat the wet nano-copper powder for 20 minutes, keep stirring and ultrasonic dispersion treatment, add 0.6 g of ammonium bicarbonate, fully stir and ultrasonically treat for 20 minutes, then add an appropriate amount 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 was measured to be 9 with precision pH test paper, and the washing was stopped, and the supernatant was poured off to obtain wet nano-copper copper powder;

[0030] (4) Use the stirring in step (2) and ultrasonic waves with the...

Embodiment 3

[0033] (1) Wash the nano-silver prepared by 0.05mol of silver nitrate through the liquid phase reduction method with pure water, centrifuge twice, pour off the supernatant to obtain wet nano-silver powder;

[0034] (2) Under the condition of stirring, use a power of 200W and a frequency of 1MHZ to ultrasonically treat the wet nano-silver powder for 15min, keep stirring and ultrasonically disperse, add 0.5g of ammonium bisulfite, fully stir and ultrasonically treat for 20min, then add an appropriate amount Pure water, centrifuged to obtain wet nano-silver powder;

[0035] (3) Wash with pure water and centrifuge the wet nano-silver powder obtained in step (2) twice, measure the pH of the supernatant with precision pH test paper to be 8, stop washing, pour off the supernatant, and obtain nano-silver powder use;

[0036] (4) Use the stirring in step (2) and ultrasonic waves with the same power and frequency to disperse the wet nano-copper powder obtained in step (3), add 1.5 gram...

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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 study of nanomaterials has become a hot spot in the field of materials research at this stage. Nanomaterials also become ultrafine particle materials, which are materials with at least one dimension in the nanoscale range (1-100nm, 0.1-100nm in engineering), or as the basic structural unit. Nano metal particles are widely used in powder metallurgy, magnetic materials, conductive paste, battery materials, catalysts and other fields due to their large specific surface area, good electrical conductivity and chemical activity. [0003] There are various methods for the preparation of metal nanoparticles, which are mainly divided into two ...

Claims

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Application Information

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Patent Type & Authority Applications(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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