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A kind of preparation method of nanoporous silver powder

A nanoporous silver and powder technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve difficult large-scale production, low yield, complex electrochemical dealloying process of alloy strips, etc. problems, to achieve the effect of easy large-scale production, simple process and high purity

Active Publication Date: 2022-07-26
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Mu Zhangyan et al. 30 Zn 70 Alloy strips were used as precursors, and nanoporous silver strips were obtained by electrochemical dealloying [Mu Zhangyan, Zhou Xuelong, Fan Zheng, et al., Rare Metal Materials and Engineering, 2019, 48(10):3252-3257], However, the process of preparing alloy strips and electrochemical dealloying by stripping method is complicated and the yield is low, so it is difficult to produce on a large scale.

Method used

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  • A kind of preparation method of nanoporous silver powder
  • A kind of preparation method of nanoporous silver powder
  • A kind of preparation method of nanoporous silver powder

Examples

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Effect test

Embodiment 1

[0023] According to the atomic ratio of 1:4 and considering the burning loss of 2% zinc, silver flakes and zinc particles with a purity of not less than 99.5% are weighed and smelted into a silver-zinc alloy by vacuum induction melting; Mechanically pulverized into powder with a particle size of less than 200 mesh; pour the silver-zinc alloy powder into a 1 mol / L sulfuric acid solution, and corrode at 30 °C for 4 hours; pour the corroded solid product into a 12 mol / L hydrochloric acid solution, at 30 The post-dipping treatment is carried out under the condition of ℃ for 4 h; the post-dipping solid product is washed with distilled water and alcohol successively until neutral, and then vacuum dried to obtain the nanoporous silver. Depend on figure 1 , figure 2 and image 3 It can be seen that the obtained nanoporous silver powder is composed of a single Ag phase, has a uniform three-dimensional connected nanoporous structure, and the pore size is about 200 nm.

Embodiment 2

[0025] According to the atomic ratio of 1:4 and considering the burning loss of 2% zinc, silver flakes and zinc particles with a purity of not less than 99.5% are weighed and smelted into a silver-zinc alloy by vacuum induction melting; Mechanically pulverized into powder with a particle size of less than 200 mesh; pour the silver-zinc alloy powder into a 1 mol / L sulfuric acid solution, and corrode it at 30 °C for 8 hours; pour the corroded solid product into a 10 mol / L hydrochloric acid solution, at 30 The post-dipping treatment is carried out under the condition of ℃ for 8h; the post-dipping solid product is washed with distilled water and alcohol successively until neutral, and then vacuum dried to obtain the nanoporous silver powder.

Embodiment 3

[0027] According to the atomic ratio of 1:4 and considering the burning loss of 2% zinc, silver flakes and zinc particles with a purity of not less than 99.5% are weighed and smelted into a silver-zinc alloy by vacuum induction melting; Mechanically pulverized into powder with a particle size of less than 200 mesh; pour the silver-zinc alloy powder into a 1 mol / L sulfuric acid solution, and corrode it at 30 °C for 6 hours; pour the corroded solid product into a 15 mol / L hydrochloric acid solution, and at 30 The post-dipping treatment is carried out under the condition of ℃ for 4 h; the post-dipping solid product is washed with distilled water and alcohol successively until neutral, and then vacuum dried to obtain the nanoporous silver powder.

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Abstract

The invention discloses a preparation method of nano-porous silver powder, which belongs to the technical field of nano-material preparation. The preparation method comprises the following steps: using vacuum induction melting method to smelt silver flakes and zinc particles with an atomic ratio of 1:4 and a purity of not less than 99.5% into an alloy, and mechanically pulverize the alloy into powder with a particle size of less than 200 meshes; then , pour the silver-zinc alloy powder into a 1 mol / L sulfuric acid solution, and corrode it at 30 °C for 4 to 8 hours; then, pour the corroded solid product into a 10 to 15 mol / L hydrochloric acid solution, at 30 °C The post-dipping process is carried out for 4-8 hours; finally, the post-dipping solid product is washed successively with distilled water and alcohol until neutral, and then vacuum-dried to obtain the nanoporous silver powder. The method has the advantages of simple process, safety and reliability, and easy large-scale production. The prepared nanoporous silver powder has high purity and has a uniform three-dimensional connected nanoporous structure.

Description

technical field [0001] The invention belongs to the technical field of nanometer material preparation, and in particular relates to a preparation method of nanoporous silver powder. Background technique [0002] Nanoporous metal refers to the material with the pore size distributed inside the metal reaching the nanometer level. It has the characteristics of small size effect, surface effect and macroscopic quantum orbital effect. Silver metal has good antibacterial properties, electrical and thermal conductivity and biocompatibility, and has broad application prospects in the fields of biomedicine, electrode materials and electronic devices. To further improve the properties of metallic silver, nanoporous silver has been proposed and developed. Nanoporous silver has a three-dimensional connected porous structure, and the ligaments in the three-dimensional structure are composed of silver crystal grains. Nanoporous silver not only has the excellent properties of metallic si...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/04B22F1/145B22F1/054C23F1/30B82Y30/00B82Y40/00
CPCB22F9/04C23F1/30B82Y30/00B82Y40/00B22F1/07B22F1/145B22F1/054
Inventor 柳东明徐浩付梦雨季小龙张月李永涛斯庭智张庆安
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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