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Nano-silver sol and preparation and purification method thereof

A technology of nano silver sol and purification method, applied in the field of nano silver sol and its preparation and purification, can solve the problems of complex process requirements, high cost, difficult purification of nano silver sol, etc. The effect of less impurities

Active Publication Date: 2014-02-19
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition to the necessary substances such as nano-silver particles, protective agents, and dispersion media in nano-silver sol, the concentration of other electrolytes, unreacted reducing agents, and anions (such as NO3-) should be as low as possible, while traditional sol purification methods mainly include Dialysis and ultrafiltration have disadvantages such as complex process requirements and high cost, and are difficult to apply to the purification of nano-silver sol

Method used

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  • Nano-silver sol and preparation and purification method thereof

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preparation example Construction

[0021] The invention relates to a preparation and purification method of nano silver sol, which is characterized in that the steps of the method are as follows: using silver salt, protective agent and cosolvent, using water as solvent, mixing silver salt solution and protective agent aqueous solution, adding a certain A certain amount of reducing agent is reduced to obtain the initial nano-silver sol, and an appropriate amount of pH regulator is added to the sol, and the required concentration of nano-silver sol is obtained after adjusting the pH value, precipitation, separation, washing, and redissolution, and is characterized in that , nano silver particle size controllable, uniform distribution, adjustable sol concentration.

[0022] Concrete preparation steps are as follows:

[0023] 1. Prepare a certain concentration of protective agent solution:

[0024] Weigh a certain amount of protective agent, add it into water containing an appropriate amount of co-solvent, stir fo...

Embodiment 1

[0036] The silver salt adopts silver nitrate, the protective agent adopts chitosan, the cosolvent adopts glacial acetic acid, the reducing agent adopts sodium borohydride, the pH value regulator adopts sodium hydroxide, and water is the solvent. After dissolving, mixing, reducing, adjusting the pH value, After precipitation, separation, washing, and redissolution, 5 ppm of stable nano-silver sol was obtained. Concrete preparation steps are as follows:

[0037] 1. Prepare chitosan acetic acid solution: add 500ml of water to a glass container, add 10ml of glacial acetic acid, stir for 5-10 minutes, mix well, weigh 4g of chitosan and add it to the aforementioned acetic acid aqueous solution, and stir for 3 to 5 hours , until the solution is clarified to obtain a certain concentration of chitosan solution as a protective agent solution;

[0038] 2. Ag + Preparation of solution: Weigh 0.1574g of silver nitrate, add 500ml of water, stir for 10 minutes to obtain silver nitrate soluti...

Embodiment 2

[0047] The silver salt is silver acetate, the protective agent is chitosan, the cosolvent is formic acid, the reducing agent is potassium borohydride, the pH regulator is sodium hydroxide, and water is the solvent. After dissolution, mixing, reduction, adjustment of pH, precipitation , separation, washing and redissolving to obtain 5000ppm stable nano-silver sol. Concrete preparation steps are as follows:

[0048] 1. Prepare chitosan formic acid solution: add 500ml of water to a glass container, add 5ml of formic acid, stir for 5 to 10 minutes, mix well, weigh 1g of chitosan and add it to the aforementioned formic acid aqueous solution, stir for 3 to 5 hours, Until the solution is clear, a certain concentration of chitosan solution is obtained as a protective agent solution;

[0049] 2. Ag + Preparation of the solution: Weigh 0.3095g of silver acetate, add 500ml of water, and stir for 10 minutes to obtain a silver acetate solution as Ag + solution;

[0050] 3. Mix the chit...

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Abstract

The invention discloses a nano-silver sol and a preparation and purification method thereof. The stable nano-silver sol is formed through the steps that silver salt, protective agents and cosolvent are used, water serves as a solvent, the silver salt solution and the protective agent water solution are mixed, a certain amount of reducing agents are added to carry out reduction, an initial nano-silver sol is obtained, and the nano-silver sol with needed concentration is obtained through pH value adjustment, sedimentation, separation, washing and redissolution. The nano-silver sol is characterized in that nano-silver particles are controllable in size and even in distribution, and the concentration of the sol is adjustable. According to the nano-silver sol and the preparation and purification method thereof, the adjustment of the pH value is used for purifying the nano-silver sol for the first time, the purification is simply carried out through the pH value adjustment, the sedimentation, the separation, the washing and other steps, and the nano-silver sol has the advantages of being few in harmful impurity and environmentally friendly. The preparation and purification method for the nano-silver sol has the advantages of being low in cost, simple in technology and capable of being applied to mass production.

Description

technical field [0001] The invention belongs to the technical field of nanometer metal sol, and in particular relates to a nanometer silver sol and a preparation and purification method thereof. Background technique [0002] Nano-silver has special properties that many macroscopic materials do not have, such as the small size effect, surface effect, quantum size effect, and macroscopic quantum tunneling effect of nanomaterials. It has been widely used in antibacterial materials, electronic pastes, printing materials, and biosensors. Materials, localized surface plasmon resonance, surface enhanced Raman spectroscopy, electrode materials, antistatic materials, catalysts, information storage and other fields. [0003] In recent years, nano-silver preparation technology has developed rapidly, and there are various methods. Nano silver preparation methods mainly include chemical reduction method, microemulsion method, vapor phase deposition method, γ-ray radiation method, laser ...

Claims

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Application Information

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IPC IPC(8): B22F1/00B22F9/24B82Y40/00
Inventor 谈发堂蔡运成王维乔学亮陈建国
Owner HUAZHONG UNIV OF SCI & TECH
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