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Highly dispersible spherical nano-silver powder and preparation method thereof

A spherical nano-silver, high-dispersity technology, applied in the field of nano-silver powder, can solve the problems of poor product dimensional stability, large size of spherical silver powder, wide particle size distribution, etc., and achieve the effects of low cost, easy addition and easy collection

Inactive Publication Date: 2010-06-02
ZHEJIANG KUNZHILIN BIOMEDICINE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The size of the spherical silver powder prepared by this method is large, belongs to the micron level, the particle size distribution is wide, the dimensional stability of the product is poor, and the reaction conditions need to be under acidic conditions, and the cost of raw materials is relatively high

Method used

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  • Highly dispersible spherical nano-silver powder and preparation method thereof
  • Highly dispersible spherical nano-silver powder and preparation method thereof
  • Highly dispersible spherical nano-silver powder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A preparation method of highly dispersed spherical nano-silver powder, comprising the steps of:

[0027] (1) Mix 400g PEG400 and 100g PEG2000 with 18g deionized water and stir well.

[0028] (2) Weigh 425mgAgNO 3 and 100mg of glucose solids were added to the solution obtained in step (1), fully dissolved, and stirred evenly.

[0029] (3) The reaction temperature is 70° C., and the reaction time is 3 hours. The reaction product is centrifuged at 5000 rpm, filtered, and washed three times with distilled water to obtain silver nanoparticles.

[0030] The transmission electron microscope picture of gained nano-silver prepared in this embodiment is as follows figure 1 As shown, it can be seen from the figure that the nano-silver is spherical, the particle size is about 3-20nm, and belongs to the nanoscale. The obtained spherical nano-silver powder has high dispersion and no agglomeration between particles. The XRD figure of present embodiment gained nano-silver, as figu...

Embodiment 2

[0032] A preparation method of highly dispersed spherical nano-silver powder, comprising the steps of:

[0033] (1) Mix 600g PEG600 and 50g PEG1000 with 18g deionized water and stir well.

[0034] (2) Weigh 1200mgAgNO 3 and 100mg of glucose solids, added to the PEG solution, fully dissolved, and stirred evenly.

[0035] (3) The reaction temperature is 60° C., and the reaction time is 10 h. The reaction product is centrifuged at 8000 rpm, filtered, and washed three times with distilled water to obtain silver nanoparticles.

[0036] The transmission electron microscope picture of gained nano-silver prepared in this embodiment is as follows image 3 As shown, it can be seen from the figure that the nano-silver is spherical, with a particle size of about 3-10 nm, and no agglomerated particles. The XRD pattern of the nano-silver obtained in the present embodiment is basically the same as figure 2 shown.

Embodiment 3

[0038] A preparation method of highly dispersed spherical nano-silver powder, comprising the steps of:

[0039] (1) Mix 400g PEG400 and 100g PEG600 with 90g deionized water and stir well.

[0040] (2) Weigh 2000mgAgNO 3 and 100mg of glucose solids were added to the solution obtained in step (1), fully dissolved, and stirred evenly.

[0041] (3) The reaction temperature is 70° C., and the reaction time is 2 hours. The reaction product is centrifuged at 7000 rpm, filtered, and washed three times with distilled water to obtain silver nanoparticles.

[0042] The transmission electron microscope picture of gained nano-silver prepared in this embodiment is as follows Figure 4 As shown, it can be seen from the figure that the nano-silver is spherical, the particle size is about 3-20nm, and there is no agglomerated particle. The XRD pattern of the nano-silver obtained in the present embodiment is basically the same as figure 2 shown.

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Abstract

The invention discloses highly dispersible spherical nano-silver powder and a preparation method thereof. The method comprises the following steps of: mixing PEG and deionized water in a molar ratio of 1 to (0.005-5), and uniformly stirring the obtained solution; then mixing AgNO3 and a glucose solid in the molar ratio of 1 to (0.005-2), then adding the mixture into solution of the PEG, dissolving the mixture, uniformly stirring the obtained solution, and reacting for 3 to 10 hours at the temperature of between 20 and 70 DEG C, wherein the molar ratio of the PEG to the AgNO3 is (400-10) to 1; and then centrifugating and filtering a reaction product, and washing the obtained product with distilled water to obtain the nano-silver particles. The preparation method is simple and easy to operate; the spherical nano-silver powder has the particle size of between 3 and 20nm, and belongs to a nanometer level; silver nano-particles have the advantages of small size, uniform distribution, good stability and strong antibacterial ability; all used solvents are non-toxic; and the spherical nano-silver powder is easy to add into other products.

Description

technical field [0001] The invention relates to a nano-silver powder, in particular to a highly dispersed spherical nano-silver powder and a preparation method thereof. Background technique [0002] Due to the unique properties and wide application prospects of nano silver, its preparation and application have become the focus of research. When the particle size of silver is as low as nanometer, it has quantum size effect, small size effect and surface effect. Nanoparticles present many unique physical and chemical properties, such as high specific surface area, strong activity, low-temperature sintering, etc. These characteristics make silver nanoparticles widely used in many fields, with excellent catalytic effect, antibacterial properties, Nonlinear optical properties, ultra-high electrical conductivity. [0003] The preparation method of nano-silver generally must meet following basic requirements: (1) the surface of gained nano-silver particle is clean and high in pur...

Claims

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Application Information

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IPC IPC(8): B22F9/24
Inventor 魏坤吴远
Owner ZHEJIANG KUNZHILIN BIOMEDICINE TECH
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