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Flower-like silver preparation method adopting gallic acid as structure-directing agent

A technology of structure-directing agent and gallic acid, which is applied in the direction of nanotechnology, can solve the problems of poor environmental compatibility, harsh reaction conditions, and high equipment requirements, and achieve the effects of low cost, high repetition rate, and simple preparation method

Active Publication Date: 2020-09-18
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems of harsh reaction conditions, high equipment requirements, cumbersome methods and poor environmental compatibility in the current silver nanomaterial preparation method, the invention provides a gallic acid Preparation method of flower-shaped silver as structure directing agent

Method used

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  • Flower-like silver preparation method adopting gallic acid as structure-directing agent
  • Flower-like silver preparation method adopting gallic acid as structure-directing agent
  • Flower-like silver preparation method adopting gallic acid as structure-directing agent

Examples

Experimental program
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Effect test

Embodiment 1

[0023] At room temperature, configure 1mol / L AgNO 3 solution, 1mol / L AA (ascorbic acid) solution, 1mol / L PVP solution, 0.1mol / L gallic acid solution. Under ice-water bath conditions, add silver nitrate aqueous solution and protective agent polyvinylpyrrolidone solution to ultrapure water, 1600rpm magnetic stirring 5min, add structure directing agent gallic acid solution in the system, the silver ion contained in gallic acid and silver nitrate The molar ratio of the substance is 1:20; continue to stir for 5 minutes, then quickly inject the reducing agent ascorbic acid solution into the system, the solution changes rapidly from colorless to black gray, and the molar ratio of silver ions contained in silver nitrate to ascorbic acid is 1.5 : 1, reacted 15min, took out the reaction solution after the reaction finished and obtained the flower-shaped silver particles with ultrapure water and ethanol centrifugal washing 3 times (2000rpm, 5min).

Embodiment 2

[0025] At room temperature, configure 1mol / L AgNO 3 solution, 1mol / L AA (ascorbic acid) solution, 1mol / L PVP solution, 0.1mol / L gallic acid solution. Under ice-water bath conditions, add silver nitrate aqueous solution and protective agent polyvinylpyrrolidone solution to ultrapure water, 1600rpm magnetic stirring 5min, add structure directing agent gallic acid solution in the system, the silver ion contained in gallic acid and silver nitrate The molar ratio of the substance is 1:50; continue to stir for 5 minutes, then quickly inject the reducing agent ascorbic acid solution into the system, the solution changes rapidly from colorless to black gray, and the molar ratio of silver ions contained in silver nitrate to ascorbic acid is 1.5 : 1; reacted for 10min, after the reaction, the reaction solution was taken out and washed with ultrapure water and ethanol for 3 times (2000rpm, 5min) to obtain flower-shaped silver particles.

Embodiment 3

[0027] At room temperature, configure 1mol / L AgNO 3 solution, 1mol / L AA (ascorbic acid) solution, 1mol / L PVP solution, 0.1mol / L gallic acid solution. Under ice-water bath conditions, add silver nitrate aqueous solution and protective agent polyvinylpyrrolidone solution to ultrapure water, 1600rpm magnetic stirring 5min, add structure directing agent gallic acid solution in the system, the silver ion contained in gallic acid and silver nitrate The molar ratio of the substance is 1:16; continue to stir for 5 minutes, then quickly inject the reducing agent ascorbic acid solution into the system, the solution changes rapidly from colorless to black gray, and the molar ratio of silver ions contained in silver nitrate to ascorbic acid is 1.5 : 1, react 30min, take out reaction solution and obtain flower-shaped silver particle after reaction finishes 3 times (2000rpm, 5min) with ultrapure water and ethanol centrifugation.

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Abstract

The invention belongs to the technical field of nanometer material preparation, and particularly relates to a flower-like silver preparation method adopting gallic acid as a structure-directing agent.Under an ice-water bath, a silver nitrate water solution and a protective agent polyvinylpyrrolidone solution are added into ultra-pure water, magnetic stirring is performed, a structure-directing agent gallic acid solution is added into the system, continuous stirring is performed, a reducing agent ascorbic acid solution is rapidly injected into the system, a reaction is performed, after the reaction is finished, a reaction solution is taken out, and ultra-pure water is used for centrifugal cleaning to obtain flower-like silver particles. The prepared flower-like silver is of the complete and clear multi-level structure, the specific area is large, and the performance and the application field of silver nanoparticles are greatly enlarged.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial preparation, and in particular relates to a method for preparing flower-like silver using gallic acid as a structure-directing agent. Background technique [0002] Nanomaterials have received great attention because of their unique size dependence. Noble metal nanomaterials such as gold and silver nanosols have been widely used in catalysis, medical treatment, surface-enhanced Raman scattering and other researches. Among noble metal nanomaterials, nanosilver has unique optical, electrical and catalytic properties. [0003] However, the traditional method of preparing silver nanomaterials has harsh reaction conditions, high equipment requirements, cumbersome preparation methods, and the organic solvents used affect human health and cause environmental pollution. It is urgent to find a green and simple method that saves energy and reduces costs. Nano silver synthesis method. Contents of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B82Y40/00
CPCB22F9/24B82Y40/00
Inventor 梅林玉李莎王俊元
Owner ZHONGBEI UNIV
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