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Preparation method of noble metal-coated melamine core-shell nanostructure

A melamine, core-shell technology, applied in the field of precious metal@melamine core-shell structure nanocomposite and its hydrothermal preparation, can solve the problems of poor weather resistance, easy agglomeration, etc., and achieve a simple and easy preparation method and improved compatibility. , the effect of improving the scope of application

Active Publication Date: 2021-05-11
江西善纳新材料科技有限公司
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] The purpose of the present invention is to provide a kind of Au / Ag@melamine core-shell structure nano-particles and its preparation method, which can effectively improve the problems of easy agglomeration and poor weather resistance of Au / Ag

Method used

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  • Preparation method of noble metal-coated melamine core-shell nanostructure
  • Preparation method of noble metal-coated melamine core-shell nanostructure

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preparation example Construction

[0043] A preparation method of Au / Ag@melamine core-shell structure nanoparticles, comprising the following steps:

[0044] (1) Au / Ag surface modification: Take an appropriate amount of Au or Ag nanopowder and disperse it in a solvent, ultrasonically treat it, then add a modifier (surfactant) and heat and stir. The reaction temperature is 30-100°C, and the reaction time is After 3-24 hours, the product is collected by centrifugation, washed, and dried in vacuum; the Au / Ag is a nanoparticle obtained according to a method reported in literature. The solvent is selected from one or both of alcohols, purified water, and toluene, and the modifier is selected from polyvinylpyrrolidone PVP, silane coupling agent (KH-570, KH-550), catechol 1. One or more types of ascorbic acid, the amount of the modifier added is 1-5% of the mass of the Au / Ag nanometer powder.

[0045](2) Prepolymer preparation: Add melamine into deionized water, adjust the pH to 7-10, heat and stir until a clear solu...

Embodiment 1

[0050] (1) Surface modification of Au nanoparticles:

[0051] Add 1.0g of Au and 80mL of toluene into a 50mL three-necked flask, and ultrasonicate for 30min. Then 0.025g of PVP was added to the above system, heated to 80°C, and stirred for 12h. The product was collected by centrifugation, washed with absolute ethanol, and dried under vacuum at 40°C.

[0052] (2) Preparation of prepolymer:

[0053] Add 1.4 g of melamine, 2.7 g of formaldehyde solution, and 11 g of purified water into a 50 mL beaker, and adjust the pH to 8 with triethanolamine. Put the beaker into a water bath and heat up to 80°C, and stir the reaction for 1 h until a clear and transparent solution is obtained.

[0054] (3) Get an appropriate amount of modified Au / Ag nano-powder and disperse it in deionized water. The mass ratio of the modified Au / Ag nano-powder to pure water is 1:200. 30min;

[0055] (4) The prepolymer aqueous solution prepared in step (2) is added to the dispersion liquid of Au / Ag nanopow...

Embodiment 2

[0058] (1) Surface modification of Ag nanoparticles:

[0059] Add 1.0g Ag and 8.0mL toluene to a 50mL three-necked flask, and treat it ultrasonically for 30min. Then 0.05g of PVP was added to the above system, heated to 80°C, and stirred for 12h. The product was collected by centrifugation, washed with absolute ethanol, and dried under vacuum at 40°C.

[0060] (2) Preparation of prepolymer:

[0061] Add 1.4 g of melamine, 3.6 g of formaldehyde solution, and 8.0 g of purified water into a 50 mL beaker, and adjust the pH to 8.5 with 0.1 M triethanolamine. Put the beaker in a water bath and raise the temperature to 80°C, and stir for 0.5h until a clear and transparent solution is obtained.

[0062] (3) Get an appropriate amount of modified Au / Ag nano-powder and disperse it in deionized water. The mass ratio of the modified Au / Ag nano-powder to pure water is 1:200. 30min;

[0063] (4) The prepolymer aqueous solution prepared in step (2) is added to the dispersion liquid of Au...

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Abstract

The invention relates to a preparation method of Au / Ag melamine core-shell structure nanoparticles, which comprises the following steps: (1) Au / Ag surface modification: dispersing a proper amount of Au or Ag nano powder into a solvent, carrying out ultrasonic treatment, then adding a modifier, heating and stirring, centrifugally collecting a product, washing and carrying out vacuum drying; (2) preparation of a prepolymer: adding melamine into deionized water, adjusting the pH value, heating and stirring until a clear solution is obtained, and continuously keeping the temperature for 1-5 hours; (3) dispersing a proper amount of modified Au / Ag nano powder into deionized water, and carrying out ultrasonic treatment; and (4) adding a proper amount of the prepolymer aqueous solution prepared in the step (2) into the dispersion liquid of the Au / Ag nano-powder modified in the step (3), adjusting the pH value, heating and stirring, and carrying out post-treatment to obtain the Au / Ag-melamine core-shell structure nano-particles. The problems that Au / Ag is prone to agglomeration and poor in weather resistance can be effectively solved.

Description

technical field [0001] The invention belongs to the technical field of synthesis of nanocomposite materials, and in particular relates to a noble metal (such as gold or silver, Au / Ag)@melamine core-shell structure nanocomposite material and a hydrothermal preparation method thereof. Background technique [0002] Precious metals (such as gold and silver) have been widely used in many fields. This is because gold has high electron density, dielectric properties and catalytic effect, and can be combined with a variety of biological macromolecules without affecting their biological activity. Silver has good electrical conductivity. Due to its good electrical conductivity, silver nanoparticles occupy an extremely important position in the field of microelectronics. [0003] In addition, nano silver has a strong bactericidal effect. Studies have found that the smaller the particle size, the stronger the bactericidal performance. After the nano-silver particles are combined wit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J13/20B01J13/02B01J13/22B82Y30/00B82Y40/00
CPCB01J13/20B01J13/02B01J13/22B82Y30/00B82Y40/00
Inventor 蒋绪川陈伟凡
Owner 江西善纳新材料科技有限公司
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