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Method for preparing small-size nano-silver with chitosan as reducing agent

A technology of chitosan and small size, which is applied in the field of synthesis of metal nanoparticles to achieve the effect of stable physical and chemical properties, good monodispersity and excellent performance

Active Publication Date: 2015-04-22
天津尚蒙科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, different stabilizers have different growth regulation effects on silver nanoparticles, so silver nanoparticles with different sizes and shapes can be prepared, but so far, there has been no preparation of silver nanoparticles with a particle size below 5nm. of silver nanoparticles

Method used

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  • Method for preparing small-size nano-silver with chitosan as reducing agent
  • Method for preparing small-size nano-silver with chitosan as reducing agent
  • Method for preparing small-size nano-silver with chitosan as reducing agent

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preparation example Construction

[0018] A kind of preparation method of the small size nano-silver taking chitosan as reducing agent of the present invention, the steps are as follows:

[0019] Step 1, dissolving chitosan with Mr=60000~120000 in 1% acetic acid solution by volume ratio, dissolving overnight to obtain a chitosan solution with a concentration of 2~6mg / ml;

[0020] Step 2, place the chitosan solution of Mr=60000~120000 newly configured in step 1 in the flask;

[0021] Step 3. Under continuous stirring, mix the newly prepared AgNO with a concentration of 20-60mM 3 The solution was added dropwise into the above-mentioned flask containing the chitosan solution, in which AgNO 3 The volume ratio of the solution to the chitosan solution is 0.2-0.4; then a sodium citrate solution with a concentration of 40 mM is added to the container, wherein the volume ratio of the sodium citrate solution to the chitosan solution is 0.01-0.04;

[0022] Step 4: React in a water bath at 60° C. to 95° C. for 2 hours to...

Embodiment 1

[0025] Dissolve 1.5 g of chitosan with Mr=60000-120000 in an appropriate amount of 1% acetic acid solution by volume, and dissolve overnight so that the concentration of the chitosan solution is 6 mg / ml.

[0026] Add 20ml of chitosan solution with Mr=60000~120000 newly configured and place in the flask.

[0027] Under continuous stirring, 8ml of freshly prepared 60mM AgNO 3 The solution was added dropwise to the flask, followed by the dropwise addition of 0.8 ml of 40 mM sodium citrate solution. React in a water bath at 95°C for 8 hours to obtain nano-silver sol.

[0028] Picture 1-1 The TEM picture of the silver sol that embodiment 1 obtains is shown, Figure 1-2 It is the particle size distribution figure of silver nanoparticles in the product of Example 1.

Embodiment 2

[0030] Dissolve 1.0g of chitosan with Mr=60000~120000 in an appropriate volume ratio of 1% acetic acid solution, and dissolve overnight. The concentration of the chitosan solution was 4 mg / ml.

[0031] Add 40ml of newly configured Mr=60000~120000 chitosan solution to the flask, and place it in a water bath at 80°C.

[0032] Under continuous stirring, 8ml of freshly prepared 40mM AgNO 3 The solution was added dropwise to the above flask, followed by the dropwise addition of 0.8 ml of 40 mM sodium citrate solution. React in a water bath at 80°C for 5 hours to obtain nano-silver sol. Figure 2-1 The TEM picture of the silver sol that embodiment 2 obtains is shown, Figure 2-2 It is the particle size distribution figure of silver nanoparticles in the product of Example 2.

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Abstract

The invention discloses a method for preparing small-size nano-silver with chitosan as a reducing agent. The method comprises the following steps: dissolving the chitosan with Mr equal to 60000-120000 in acetum with the volume ratio of 1%, dissolving for a night to obtain a chitosan solution with the concentration of 2-6mg / ml, adding the newly-prepared chitosan solution with the Mr equal to 60000-120000 in a flask, gradually dropping a newly-prepared AgNO3 solution with the concentration of 20-60mM in the flask while stirring is carried out, wherein V(AgNO3):V(chitosan)=0.2-0.4, then gradually dropping a sodium citrate solution with the concentration of 40mM in the flask, wherein the V(sodium citrate):V(chitosan)=0.01-0.04, conducting reaction for 2h-8h in a 60DEG C-95DEG C water bath, and then obtaining nano-silver sol. The grain sizes of the obtained product are concentrated below 5nm, the monodispersity is good, and the small-size nano-silver is environmentally friendly.

Description

technical field [0001] The invention relates to the synthesis of metal nanoparticles, in particular to a method for preparing small-sized nano silver particles. Background technique [0002] Due to the special effects of nanoparticles, nano silver has high surface energy and chemical activity, so nano silver has light, heat, electricity, sound, magnetic, mechanical properties and catalytic properties, and is widely used in antistatic materials, catalytic materials, low-temperature superconducting materials, biosensor materials, electronic pastes and antibacterial and antibacterial materials and other emerging functional materials. Because nano-silver has shown application value in many fields, it is favored by many scientific and technological workers. At present, it has been the goal pursued by researchers to prepare gold nanoparticles with good monodispersity and small particle size through simple methods. There are many preparation methods for nano-silver. According to t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24
Inventor 李方李慧
Owner 天津尚蒙科技有限公司
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