Method for preparing silver/silicon dixoide nucleocapsid structure nano particles

A technology of silica and core-shell structure, applied in the direction of coating, etc., to achieve the effect of simple process, safe operation and low cost

Inactive Publication Date: 2007-11-14
BEIJING UNIV OF CHEM TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a method for preparing silicon dioxide-coated silver nanoparticles with monodispersity, a concentration of 100-400ppm, simple preparation process, safe operation, and low cost. The problem of controllable particle size and shape

Method used

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  • Method for preparing silver/silicon dixoide nucleocapsid structure nano particles
  • Method for preparing silver/silicon dixoide nucleocapsid structure nano particles
  • Method for preparing silver/silicon dixoide nucleocapsid structure nano particles

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Embodiment 1

[0031] 0.4mmolg hexadecyltrimethylammonium bromide is dissolved in 180ml water, add silver nitrate, make the concentration of silver nitrate in the whole solution be 2.5mmol / L, after stirring for 1 minute, ascorbic acid (0.417mmol) after 20ml water dissolving Slowly and uniformly add to the mixture, adjust the pH value to 6 with sodium hydroxide solution, react for 10 minutes, add 50ml of ethanol, dropwise add 0.5ml of tetraethyl orthosilicate, continue to stir for 3 hours and then let stand. Observed by electron microscope, as shown in Figure 1, the product particles are uniform, the concentration is 200ppm, and the average particle diameter is 56nm, as shown in Figure 7.

Embodiment 2

[0033] Dissolve 0.8mmol cetyltrimethylammonium bromide in 180ml of water, add silver nitrate, make the concentration of silver nitrate in the whole solution be 5mmol / L, after stirring for 1 minute, slowly and uniformly dissolve 20ml of water-soluble ascorbic acid (0.83mmol) was added into the mixture, and the pH value was adjusted to 8 with sodium hydroxide solution. After reacting for 10 minutes, 50 ml of ethanol was added, 1 ml of ethyl orthosilicate was added dropwise, and the mixture was left to stand after stirring for 3 hours. After changing the amount of surfactant and the concentration of silver nitrate, observed by electron microscope, as shown in Figure 2, the dispersion has not decreased significantly, the product particles are uniform, the concentration is 400ppm, the silver core of about 16-22nm and the whole The average particle size of the particles is about 50nm.

Embodiment 3

[0035] Drop 2.5ml of hydrazine hydrate (0.1mol / L) into the aqueous solution containing 0.2mmol of hexadecyltrimethylammonium bromide, stir for 2 minutes, then drop into the silver nitrate solution at a constant speed to make the silver nitrate concentration in the whole solution 1.25mmol / L, continue to stir for 7 minutes, add 2ml of ammonia water and 50ml of ethanol solution, the pH value is 10, continue to react for 1 minute, then add 0.25ml of ethyl orthosilicate. Stirring was continued for 2 hours and then left to stand. Observed by electron microscope, as shown in Figure 3, the particles have good dispersion and uniform particle size, the concentration is 100ppm, the silver core size is between 6-12nm, and the particle size is between 35-50nm.

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Abstract

A preparation method of Ag / SiO2 nucleocapsid structure nanoparticles belongs to particle preparation field. Taking AgNO3 as material and hexadecyl trimethyl ammonium bromide as surfactant, the invention prepares Ag nanoparticals by oxidation-reduction reaction in solution under a certain temperature. Reducer for reducing AgNO3 is hydrazinehydrate and ascorbic acid. Based on the prepared Ag nanoparticals, add ethanol and take TEOS as a source of SiO2 to prepare sol solution with SiO2 wrapping Ag nanoparticals. The method has simple operation and low cost. The prepared particles have distinct nucleocapsid structure, uniform granularity and good dispersibility. It has many application prospects in biology sterilization, chemistry and optical materials etc.

Description

technical field [0001] The invention belongs to the field of nanoparticle preparation, in particular to a method for preparing silver / silicon dioxide core-shell nanoparticle Background technique [0002] Nanomaterials, especially noble metal nanomaterials, have aroused widespread interest due to their unique properties different from traditional materials in mechanics, electricity, heat, optics, and catalysis. Among them, nano-silver particles are a widely used metal material. Its performance and potential applications in catalytic reactions, optical transmission, surface modification, and biochemical applications have attracted more and more attention. However, due to the high surface energy of nanoparticles at the nanometer size, there is a tendency to easily agglomerate in the medium, resulting in poor dispersion, which greatly limits the application of nanomaterials. Recently, by coating polymers on the surface of metal nanoparticles, surfactants and titanium dioxide ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B22F1/02
Inventor 陈建峰徐科王洁欣
Owner BEIJING UNIV OF CHEM TECH
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