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Semi-dry nano silver synthesis method

A synthesis method and nano-silver technology, applied in the direction of nano-technology, can solve the problems of limiting the use range of nano-silver, the biological toxicity of reducing agents, and the high energy consumption of nano-silver, and achieve regular particle shape, good dispersion, and mild reaction conditions. Effect

Inactive Publication Date: 2014-09-10
HUAIYIN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional sol-gel method to prepare nano-silver consumes a lot of energy and waste water, and the reducing agent used has certain biological toxicity, which limits the scope of use of nano-silver.

Method used

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  • Semi-dry nano silver synthesis method
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Experimental program
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Effect test

Embodiment 1

[0009] Embodiment 1: First, silver nitrate and agar are fully mixed according to the mass ratio of 3:1, and deionized water with 6 times the mass of the agar is then fully ground; continue to add sodium carbonate to adjust the pH value to 8.5, and grind to a paste; then control the temperature React at 75° C. for 3 h; finally vacuum freeze-dry to prepare agar-protected nano-silver powder.

Embodiment 2

[0010] Embodiment 2: First silver nitrate and agar are fully mixed according to the mass ratio of 1:1, then fully ground with deionized water with 5 times the mass of the agar; continue to add sodium carbonate to adjust the pH value to 8, and grind to a paste; then control the temperature React at 65°C for 6 hours; finally vacuum freeze-dry to obtain agar-protected nano-silver powder.

Embodiment 3

[0011] Embodiment 3: first silver nitrate and agar are fully mixed according to mass ratio 5:1, add the deionized water of 8 times of agar quality and grind fully again; Continue to add sodium carbonate to adjust pH value to be 8-9, grind to paste; Then The temperature was controlled at 90° C. for 0.5 h; finally, vacuum freeze-drying was performed to obtain agar-protected nano-silver powder.

[0012] The electron microscope figure of embodiment 1-3 gained nano-silver is as figure 1 Shown; The XRD figure of embodiment 1-3 gained nano silver figure 2 shown.

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Abstract

The invention discloses a semi-dry nano silver synthesis method. The method includes mixing silver nitrate and agar at the mass ratio of 1:1 to 5:1, adding deionized water in mass of 5 to 8 times of the agar and grinding fully; adding sodium carbonate to adjust pH value to 8 to 9 till pasting, reacting for 0.5 to 6 h at the temperature of 65 to 90 DEG C, freezing and drying in vacuum, and obtaining agar-protected silver powders. According to the method, the sol-gel method for nano silver synthesis is abandoned, reductive monosaccharide is generated by accurately controlling agar homogeneous hydrolysis by controlling dosage of reaction system water and system pH value, homogeneous controllable nano silver reducing generation is implemented, the agar serves as protective agent for the nano-silver synthesis, particle aggregation is avoided, the obtained nano silver has fine dispersion, shapes of particles are structured, reacting condition is mild, synthesis system is simple, and the method is adaptive to industrial production.

Description

technical field [0001] The invention belongs to the field of metal nano material preparation, and in particular relates to a semi-dry synthesis method of nano silver. Background technique [0002] Silver nanoparticles have the advantages of excellent heat transfer, electrical conductivity, surface activity, catalysis and antibacterial properties, making them widely used in battery electrodes, optoelectronics, catalysis, biological and medical sensors, surface-enhanced Raman scattering and antibacterial. use. The traditional sol-gel method to prepare nano-silver consumes a lot of energy and waste water, and the reducing agent used has certain biological toxicity, which limits the scope of use of nano-silver. Contents of the invention [0003] The object of the present invention is to provide a method for synthesizing nano-silver by a semi-dry method, green synthesis, mild reaction conditions, simple system, low energy consumption and less waste water. [0004] The technic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B82Y40/00
Inventor 刘洪陈静施亮亮周巍金叶玲丁师杰
Owner HUAIYIN INSTITUTE OF TECHNOLOGY
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