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Preparation method of load-type silver nano-composite material

A nano-composite material, a technology of supported silver, applied in nanotechnology and other directions, can solve the problems affecting the uniformity and controllability of the size of silver nanoparticles, and the nucleation and growth of silver nanoparticles cannot be well controlled.

Inactive Publication Date: 2012-08-15
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above method is very simple to operate, but there are also certain shortcomings.
During the preparation of composite materials, the nucleation and growth of silver nanoparticles are not well controlled, which will inevitably affect the uniformity and controllability of the size of silver nanoparticles on the carrier.

Method used

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  • Preparation method of load-type silver nano-composite material
  • Preparation method of load-type silver nano-composite material
  • Preparation method of load-type silver nano-composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037]Dissolve 7 mg of sodium dihydrogen phosphate in 100 ml of water; after complete dissolution, transfer the solution to a 100 ml single-necked flask and heat to 95 °C. Then 1.8 ml of 1.48 M ferric chloride aqueous solution was added dropwise in the flask, and the mixed solution was heated to 100 °C, and naturally cooled to room temperature after reflux for 14 hours. The obtained precipitate is separated by centrifugation, and then washed several times with double distilled water and ethanol respectively, and the obtained is ferric oxide nanoparticles. The Fe2O3 nanoparticles obtained from the reaction under the transmission electron microscope were spindle-shaped, with a long diameter of about 250 nm and a short diameter of about 60 nm, such as figure 1 shown.

[0038] At room temperature, add 0.25 ml of 3-aminopropyltriethoxysilane ethanol solution with a volume ratio of 1:49 to 50 ml of 0.4 mg / ml iron oxide ethanol solution. Magnetic stirring, reaction 2 h.

[0039] A...

Embodiment 2

[0042] In a three-necked flask, dissolve 0.11 g sodium dodecyl sulfate and 0.1 g potassium persulfate in a mixed solution of ethanol (95%) / water (50ml:20ml), and stir under the protection of argon. Add 4.5 ml of styrene monomer dropwise to the solution, heat to 70 °C, and react for 8 h. After the reaction, the emulsion is centrifuged, washed several times and dispersed in ethanol. The product obtained after separation and washing is polystyrene microspheres. Observed by transmission electron microscope, the particle size of the polystyrene microspheres obtained by the reaction is about 500 nm, such as Figure 4 shown.

[0043] At room temperature, add 0.25 ml of 3-aminopropyltriethoxysilane ethanol solution with a volume ratio of 1:49 to 50 ml of 0.4 mg / ml polystyrene ethanol solution. Magnetic stirring, reaction 2 h.

[0044] At room temperature, after separating and washing the aminated polystyrene microspheres, they were dispersed in glutaraldehyde aqueous solution dilut...

Embodiment 3

[0047] Add 5 ml of water and 25 ml of absolute ethanol into a 50 ml round bottom flask, then add 1.5 ml of tetraethyl orthosilicate (TEOS) drop by drop under vigorous stirring, and mix 1.6 One ml of ammonia water and the same volume of water were added at once, stirred and reacted at room temperature for 6 hours, and the product obtained after separation and cleaning was silica microspheres. Observation by transmission electron microscope shows that the particle size of silica microspheres is about 330 nm, such as Figure 7 shown.

[0048] Add 0.25 ml of an ethanol solution of 3-aminopropyltriethoxysilane with a volume ratio of 1:49 to 50 ml of a 0.4 mg / ml ethanol solution of silica microspheres at room temperature. Magnetic stirring, reaction 2 h.

[0049] At room temperature, after separating and washing the aminated silica microspheres, they were dispersed in glutaraldehyde aqueous solution diluted with phosphate buffer solution at pH=7.4 (5 ml of 25% glutaraldehyde stock...

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Abstract

The invention discloses a preparation method of a load-type silver nano-composite material. The preparation method comprises the steps of modifying a carrier by an aminosilane coupling agent and glutaraldehyde in sequence; dispersing the modified carrier in ethanol and then adding a silver-ammonia solution; gradually heating the mixed solution to over 80 DEG C; reducing Ag ions by aldehyde groups on the surface of the carrier, thereby forming an Ag cluster on the surface of the carrier; and catalyzing ethanol by the Ag cluster to react for generating acetaldehyde, thereby further reducing the residual Ag ions and facilitating further growth of the Ag cluster, wherein, catalytic reaction and reduction reaction are carried on continuously, thereby realizing the autocatalysis growth of Ag nano-particles and finally generating the composite material with the carrier being coated by the silver nano-particles. The control on the size of the silver nano-particles and the coating degree can be realized by virtue of control on the reaction time and the dosage of silver-ammonia ions and ethanol.

Description

[0001] technical field [0002] The invention belongs to the technical field of nanometer functional materials, and in particular relates to a preparation method of a loaded silver nanocomposite material. Background technique [0003] Supported noble metal nanocomposites have attracted extensive attention due to their unique physicochemical properties. It has great potential application value in optoelectronics, catalysis, biochemistry and other fields. In recent years, with the discovery and research progress of the surface-enhanced Raman scattering (SERS) effect, the application of supported nanocomposites based on silver nanoparticles in the field of trace detection has been rapidly developed. For example, this technology has been used to study Corrosion, catalytic intermediate products, metal and thermal decomposition process, identification of drugs, detection of pesticide residues on the surface of vegetables and fruits, analysis of trace components in ink blots, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B82Y40/00
Inventor 任峰张少锋周娟吴伟肖湘衡蒋昌忠
Owner WUHAN UNIV
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