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Preparation method of nest-like core-shell-structure Ag@mTiO2 nano composite material

A technology of nanocomposite materials and core-shell structure, which is applied in the field of preparation of AgmTiO2 nanocomposite materials, can solve problems such as preparation difficulties, and achieve the effect of unique structure, adjustable particle size and high specific surface area

Active Publication Date: 2013-05-29
安徽省通源环境节能股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Typically, the shell of these materials is formed by the accumulation of nanoparticles, but functionalized porous core-shell structures or egg-yolk- Shell structure, but it is more difficult to prepare

Method used

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  • Preparation method of nest-like core-shell-structure Ag@mTiO2 nano composite material
  • Preparation method of nest-like core-shell-structure Ag@mTiO2 nano composite material
  • Preparation method of nest-like core-shell-structure Ag@mTiO2 nano composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) According to known literature reports to synthesize Ag nanoparticles (as before), the typical process is as follows: 2.5 g of PVP was dissolved in 150 ml of ethylene glycol, 1 g of AgNO 3 Add it to the above solution, mix it evenly, add it into a three-necked flask, and react in an oil bath at 130 °C for 1 h, then use a certain amount of acetone as a precipitant to centrifuge to obtain Ag nanoparticles, and redisperse them In ethanol, a solution of Ag nanoparticles is obtained;

[0020] (2) Add 10 ml of the solution obtained in step (1) to the mixed solution of ethanol and water with a volume ratio of 4:1, then add 2.5 ml of ammonia water (28%), mix well, and then add 2000 μl dropwise TEOS, reacted for 12 h, after conventional centrifugation, washing, and drying, we obtained the intermediate product AgSiO 2 composite materials;

[0021] (3), 0.15 g AgSiO obtained in step (2) 2 Nanoparticles were redispersed in 150 ml of ethanol, and 0.9 ml of ammonia solution (28...

Embodiment 2

[0024] The implementation process is the same as in Example 1 except for the following differences.

[0025] 0.15 g AgSiO obtained in the above step (2) 2 Nanoparticles were redispersed in 150 ml of ethanol, and 0.9 ml of ammonia solution (28 %) was added, sonicated for 15 min, and then 500 μl of TBOT was slowly added dropwise, and then the temperature was 45 °C for 24 h under magnetic stirring. After conventional centrifugation, washing and drying, the product AgSiO 2 TiO 2 Composite materials, finally through the above step (4) to get bird's nest-like AgTiO 2 nanocomposites.

[0026] The obtained results are basically similar to those of Example 1, except that after the final particles are etched, the outer shell is cracked to a certain extent, which shows that TiO 2 The shell needs to have a certain thickness in order to get a more ideal result.

Embodiment 3

[0028] The implementation process is the same as in Example 1 except for the following differences.

[0029] 0.5 g AgSiO obtained in the above step (3) 2 TiO 2 The composite material was dispersed in 0.24 M ammonia solution, after mixing evenly, it was put into an autoclave, and after reacting in an oven at 150 °C for 24 h, the obtained product was washed repeatedly with 0.1 M hydrochloric acid solution and deionized water Until the pH value is close to neutral, after drying, the final product AgmTiO 2 nanocomposites.

[0030] The obtained result is different from that of Example 1, in that a sandwich hollow structure is produced, the Ag core can move freely in the inner cavity, and the obtained shell is only fluffy and expanded instead of a flaky bird's nest-like shell.

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Abstract

The invention relates to a preparation method of a nest-like core-shell-structure Ag@mTiO2 nano composite material, belonging to the technical fields of inorganic chemistry and material synthesis. The invention uses a method combining hydrothermal synthesis and hydrothermal fluid corrosion to prepare the nest-like Ag@mTiO2 nano composite material which uses metal Ag nanoparticle as the core and laminar TiO2 as the three-dimensional porous shell. The material has larger specific area (300 m<2> / g), adjustable particle size and unique core-shell structure; and the synthesis conditions can be changed to accurately control the structure, shape, particle size and the like of the material. Thus, the Ag@mTiO2 nano composite material provided by the invention is hopeful to have potential application prospects in the fields of photocatalysis, Raman enhancement, biomedicine and the like.

Description

technical field [0001] The invention relates to AgmTiO with a bird's nest core-shell structure 2 (Nano titanium dioxide coated silver particles) The preparation method of the nanocomposite material belongs to the technical field of inorganic chemistry and material synthesis. Background technique [0002] Porous materials, because of their regular arrangement, adjustable particle size distribution, high specific surface area, and large adsorption capacity, have broad application prospects in the fields of catalysis, adsorption, nanometer self-assembly, and biomedicine. It has attracted more and more attention from scientists. Great progress has been made in terms of structure, composition and morphology control. However, the traditional single-component porous materials greatly limit their practical applications due to their limited functions. Therefore, people hope to synthesize multifunctional nanocomposites with rich composition and unique structure, in order to meet t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J13/02
Inventor 张海娇焦正张宗南王栋海倪扬韩雪祥
Owner 安徽省通源环境节能股份有限公司
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