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Method for preparing nanoscale metal particles by bimetallic electrode pulse direct-current bias electrodeposition

A technology of nanometer metal particles and pulsed direct current, applied in the direction of electrodes, electrolysis process, electrolysis components, etc., can solve the problems of large surfactant consumption, increased production cost, expensive raw materials, etc., and achieve high yield, dispersion and stability Good, simple process effect

Active Publication Date: 2014-08-13
BEIJING NAIAISI NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The pyrolysis method is to prepare nano-metal particle materials through the pyrolysis reaction of organometallic compounds. This method has the characteristics of simple process route, mild reaction conditions, uniform product composition, easy structure control and easy mass production, but the raw materials are expensive.
Compared with physical methods, chemical methods are more flexible and easy to operate, but at the same time, these methods need to consume a large amount of surfactants, which not only increases production costs, but also easily pollutes the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0012] Specific Embodiment 1: This specific embodiment adopts the following technical scheme: put two metal plates in parallel in an electrolytic cell equipped with an aqueous electrolyte solution, and connect the two metal plates to the positive and negative poles of the pulsed DC bias power supply respectively. , the applied waveform is a square wave, the pulse frequency is 60-100Hz, the pulse voltage amplitude is 8-12V, the bias voltage is 2-5V, and the bias current density is 0.005-0.05A / dm 2 A pulsed DC bias current is used to obtain metal particles with a particle size of 3-30nm.

[0013] The metal plate can be silver plate, platinum plate, palladium plate, nickel plate, and the distance between two metal plates is 3-10cm.

[0014] The aqueous electrolyte solution may be a weakly acidic solution with a combined concentration of chlorate, nitrate and sodium sulfite at a concentration of 0.06-0.1 mol / L, and an alkaline solution with a concentration of sulfamate at a concen...

Embodiment 1

[0022] Take two gold sheets with a thickness of 0.05mm, respectively as the anode and the cathode, and the distance between the electrode plates is 5cm to form an electrolysis system. Add gold chloride and sodium sulfite to the deionized water, the combined concentration of gold chloride and sodium sulfite in the aqueous electrolyte solution is a weakly acidic solution of 0.06mol / L, magnetically stir the aqueous electrolyte solution, and then add polyvinylpyrrolidone as a surfactant and a dispersant, The mass concentration of polyvinylpyrrolidone is 0.5% of the total mass of the aqueous electrolyte solution. The pulsed DC bias power supply adopts a square wave waveform, a pulse frequency of 60Hz, a pulse amplitude of 8V, a bias voltage of 2V, and a current density of 0.01A / dm 2 of pulsed DC bias current.

[0023] A pulsed DC bias voltage was applied for 2 days to obtain a nano-gold sol with a mass concentration of about 0.8%. The obtained nano-gold sol was stored for several...

Embodiment 2

[0025] Take two pieces of silver with a thickness of 0.2mm, respectively as the anode and the cathode, and the distance between the electrode plates is 5cm to form an electrolysis system. Add silver nitrate and sodium sulfite to deionized water, the combined concentration of silver nitrate and sodium sulfite in the electrolyte aqueous solution is a weakly acidic solution of 0.08mol / L, magnetically stir the electrolyte aqueous solution, then add polyvinylpyrrolidone as a surfactant and dispersant, polyethylene The mass concentration of pyrrolidone is 1.5% of the total mass of the aqueous electrolyte solution. The pulsed DC bias power supply adopts a square wave waveform, a pulse frequency of 60Hz, a pulse amplitude of 10V, a bias voltage of 2V, and a current density of 0.005A / dm 2 of pulsed DC bias current.

[0026] A pulsed DC bias voltage was applied for 2 days to obtain a nano-silver sol with a mass concentration of about 0.6%. The obtained nano-silver sol was stored for s...

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Abstract

The invention discloses a method for preparing nanoscale metal particles by bimetallic electrode pulse direct-current bias electrodeposition, and relates to a method for preparing nanoscale metal particles. The method comprises the following steps of putting two metal plates into an electrolytic tank with an electrolyte aqueous solution in parallel, connecting the two metal plates respectively to a positive pole and a negative pole of a pulse direct-current bias supply, and applying pulse direct-current bias currents to the two metal plates at room temperature under the conditions of a square wave form, pulse frequency of 60 to 100Hz, pulse voltage amplitude of 8 to 12V, bias voltage of 2 to 5V, and bias current density of 0.005 to 0.05A / dm<2> to obtain metal particles having sizes of 3 to 30nm. The method can realize large-scale high-yield production of high-quality nanoscale metal particles, has simple processes, low energy consumption and a high yield, is environmentally friendly and is suitable for large-scale production.

Description

Technical field: [0001] The invention relates to a method for preparing metal nanoparticles, in particular to a method for preparing nanometer metal sol by electrodeposition. Background technique: [0002] Metal particles have unique electrical, magnetic, optical, and mechanical properties when they are in the nanoscale range. Nano-metal particles have good application prospects in petroleum cracking catalysis, high-density magnetic recording materials, environmental protection, medical and biological detection and other fields. However, when the metal particles are in the nanometer scale, they have strong selective adsorption and are prone to agglomeration, which makes the preparation of stable and dispersed nano metal particles very difficult. [0003] According to different preparation principles, the preparation methods of nanoscale metal particles can be divided into physical methods and chemical methods. The physical method is the preparation of metal nanoparticles b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25C5/02C25C7/02C25C7/06
Inventor 涂江平
Owner BEIJING NAIAISI NEW MATERIAL TECH