Method for preparing highly mono-dispersed metal nanoparticles in porous material

A technology of metal nanoparticles and porous materials, applied in the field of nanomaterials and nanometers, can solve the problems of easy aggregation of nanometer metals, reduction of specific surface area, easy blockage of pores, etc., and achieve the effect of short synthesis cycle, high activity and improved stability

Inactive Publication Date: 2014-03-19
WUHAN UNIV OF TECH
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, there are unavoidable problems in the preparation of composite materials of metal nanoparticles and porous materials, such as easy clogging of pores, a large decrease in specific surface area and easy agglomeration of nano-metals, which affect its in-depth application.

Method used

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  • Method for preparing highly mono-dispersed metal nanoparticles in porous material
  • Method for preparing highly mono-dispersed metal nanoparticles in porous material
  • Method for preparing highly mono-dispersed metal nanoparticles in porous material

Examples

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Embodiment 1

[0026] This example provides the preparation of a highly monodisperse bimetallic nanoparticle porous silica composite material (PtPdMCF), and the specific steps are as follows:

[0027] (1) Synthesis of porous silica material MCF with three-dimensional continuous penetration and uniform pore size:

[0028] At room temperature, add 1.5-2.5g of P123 and 1.5-2.5g of mesitylene into a hydrochloric acid solution with a concentration of 1.2-2.0M and a volume of 50-100mL, and mix well; then heat the mixed solution to 35-45°C, After 1 to 2 hours, add tetraethyl orthosilicate to the mixed solution and continue to stir at 35 to 45°C for 15 to 25 hours; then put the solution into the reaction kettle and age at 110 to 130°C for 20 to 30 hours; finally The obtained product is filtered, washed, dried in the air, and then calcined at 500-600° C. under atmospheric conditions for more than 5 hours to obtain the porous material MCF.

[0029] (2) Dissolve 0.1-1.0 g of the porous material MCF sy...

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Abstract

The invention provides a method for preparing highly mono-dispersed metal nanoparticles in a porous material. The method comprises the following steps of: 1) synthesizing the porous material with continuous and through three-dimension and a unified aperture; 2) dissolving a precursor of the metal nanoparticles and a reducing agent in a solvent to obtain a reaction solution for synthesizing the metal nanoparticles, mixing the porous material synthesized in the step 1) with the reaction solution for synthesizing the metal nanoparticles, and enabling the reaction solution of the metal nanoparticles to enter into holes of the porous material through capillary action; 3) using the porous material as a reactor for synthesizing the metal nanoparticles, and reducing the precursor of the metal nanoparticles to obtain the metal nanoparticles; 4) filtering, washing and drying the mixed solution obtained in the step 3) to obtain the final product. The method prepares the highly mono-dispersed metal nanoparticles, and is simple and convenient in process and short in synthesis period; the synthesized mono-dispersed metal nanoparticles show high activity when serving as a catalyst of a proton exchange membrane fuel cell.

Description

technical field [0001] The invention belongs to the field of nanomaterials and nanotechnology, and in particular relates to a method for preparing highly monodisperse metal nanoparticles in porous materials. Background technique [0002] Due to their unique thermal, electrical, magnetic and optical properties, metal nanoparticles have broad application prospects in energy, environmental protection, petrochemical, biomedicine and other fields. These properties of metal nanoparticles are based on their small size. However, such a metal nanoparticle system usually has a high specific surface energy, and it is easy to agglomerate, resulting in the loss of the unique properties of the metal nanoparticle system. Therefore, how to prevent its agglomeration is a hotspot in the research of metal nanoparticle systems. [0003] It is an effective method to add stabilizers to generate electrostatic repulsion or steric repulsion between metal nanoparticles to stabilize metal nanopartic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B82Y40/00B82Y30/00
Inventor 阳晓宇应杰姜楠苏宝连
Owner WUHAN UNIV OF TECH
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