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Preparation method for nano porous sliver powder

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

Active Publication Date: 2021-07-30
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Preparation method for nano porous sliver powder
  • Preparation method for nano porous sliver powder
  • Preparation method for nano porous sliver powder

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Experimental program
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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, weigh silver flakes and zinc particles with a purity of not less than 99.5%, and melt them into silver-zinc alloys by vacuum induction melting method; the alloy obtained by melting Mechanically pulverize into a powder with a particle size of less than 200 mesh; pour the silver-zinc alloy powder into 1mol / L sulfuric acid solution, corrode at 30°C for 4 hours; pour the corroded solid product into 12mol / L hydrochloric acid solution, The post-leaching treatment is carried out for 4 hours under the condition of ℃; the solid product of the post-leaching is washed with distilled water and alcohol successively to neutrality, 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 and has a uniform three-dimensional connected nanoporous structure with a pore size ...

Embodiment 2

[0025] According to the atomic ratio of 1:4, and considering the burning loss of 2% zinc, weigh silver flakes and zinc particles with a purity of not less than 99.5%, and melt them into silver-zinc alloys by vacuum induction melting method; the alloy obtained by melting Mechanically pulverize into powder with a particle size of less than 200 mesh; pour silver-zinc alloy powder into 1mol / L sulfuric acid solution, and corrode at 30°C for 8 hours; pour the corroded solid product into 10mol / L hydrochloric acid solution, The post-leaching treatment is carried out at ℃ for 8 hours; the solid product of the post-leaching is washed with distilled water and alcohol successively to neutrality, 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, weigh silver flakes and zinc particles with a purity of not less than 99.5%, and melt them into silver-zinc alloys by vacuum induction melting method; the alloy obtained by melting Mechanically pulverize into a powder with a particle size of less than 200 mesh; pour the silver-zinc alloy powder into 1mol / L sulfuric acid solution, corrode at 30°C for 6 hours; pour the corroded solid product into 15mol / L hydrochloric acid solution, The post-leaching treatment is carried out at ℃ for 4 hours; the solid product of the post-leaching is washed with distilled water and alcohol successively to neutrality, and then vacuum-dried to obtain the nanoporous silver powder.

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Abstract

The invention discloses a preparation method for nano porous silver powder, and belongs to the technical field of nano material preparation. The preparation method comprises the following steps: adopting a vacuum induction smelting method to smelt silver pieces and zinc particles with an atomic ratio of 1:4 and purity not lower than 99.5% into alloy, and mechanically crushing the alloy into powder with grain size smaller than 200 meshes; pouring silver-zinc alloy powder into 1 mol / L of a sulfuric acid solution, and corroding for 4-8 hours at a temperature of 30 DEG C; pouring corrosion solid products into a 10-15 mol / L of a hydrochloric acid solution, soaking for 4-8 h at a temperature of 30 DEG C; and cleaning the soaked solid products with distilled water and alcohol until neutral, and performing vacuum drying to obtain the nano porous silver powder. The preparation method is simple in process, safe and reliable, is easy to achieve large-scale production; and the prepared nano porous silver powder is high in purity and has a uniform three-dimensional communication nano porous structure.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial preparation, and in particular relates to a preparation method of nanoporous silver powder. Background technique [0002] Nanoporous metals refer to materials in which the pore size distributed inside the metal reaches the nanometer level. It has the characteristics of small size effect, surface effect, and macroscopic quantum orbital effect. It has a wide range of applications in the fields of catalysis, sensing, and fuel cells. Metallic silver 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. In order to further improve the properties of metallic silver, nanoporous silver has been proposed and developed. Nanoporous silver has a three-dimensional interconnected porous structure, and the tethers in the three-dimensional structure are compo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/04B22F1/00C23F1/30B82Y30/00B82Y40/00
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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