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Self-assembly material based on silver nanoparticles and preparation method thereof

A technology of silver nanoparticles and self-assembly, applied in the direction of coating, etc., can solve the problems of complex method, cumbersome synthesis method, single structure, etc., and achieve the effect of simple preparation method

Inactive Publication Date: 2015-05-13
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Wang Yan et al. (Preparation and antibacterial properties of mesoporous silica-coated silver nanoparticles, Acta Natural Sciences) used tetraethyl orthosilicate to in-situ grow silica shells on the surface of silver particles. The method was complex and consumed a lot of raw materials.
Chinese invention patent (201210113128.X) discloses a silica-coated silver-core composite particle and its preparation method and application. This method prepares a single-core composite particle with a single structure and a cumbersome synthesis method
At present, there is no report on the distinction between single-core and multi-core composite structures. Therefore, it is of great significance to study a simple method to realize the controllable synthesis of composite structures and realize the controllable preparation of single-core or multi-core.

Method used

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  • Self-assembly material based on silver nanoparticles and preparation method thereof
  • Self-assembly material based on silver nanoparticles and preparation method thereof
  • Self-assembly material based on silver nanoparticles and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 1.1 Add 0.0170g of tannic acid into 20ml of secondary water, and dissolve completely to obtain an aqueous solution of tannic acid for later use;

[0031] 1.2 Add potassium carbonate solution (0.1M) dropwise to the above 20ml tannic acid aqueous solution to adjust the pH of the solution to 7.5;

[0032] 1.3 Put the tannic acid aqueous solution with a pH of 7.5 obtained in 1.2 into a water-soluble pot at 30°C to stabilize the temperature at 30°C, then add 0.5ml (0.1M) of silver nitrate aqueous solution dropwise, stir for 60 minutes and then centrifuge to 10ml In the secondary water, a solution containing silver nanoparticles was obtained, and the results are shown in figure 1 ;

[0033] 1.4 Mix 0.5 ml of the aqueous solution containing silver nanoparticles obtained in 1.3 with 4 ml of ethanol solution, then add 0.1 ml of ammonia solution, then add 2 microliters of tetraethyl orthosilicate, stir for 300 minutes, and centrifuge to obtain silver nanoparticles-based self-as...

Embodiment 2

[0036] 2.1 Dissolve 0.0170 g of tannic acid in 20 ml of secondary water, and completely dissolve to obtain an aqueous solution of tannic acid for later use;

[0037] 2.2 Add potassium carbonate solution (0.1M) dropwise to the above 20ml tannic acid aqueous solution to adjust the pH of the solution to 7.5;

[0038] 2.3 Put the tannic acid aqueous solution with a pH of 7.5 obtained in Example 1.2 into a water-dissolving pot at 30°C to stabilize the temperature at the temperature of the water bath, then add 0.5 ml (0.1M) of silver nitrate aqueous solution dropwise, stir for 60 minutes, and then centrifuge Separation into 10 ml of secondary water;

[0039] 2.4 Mix 0.5 ml of silver solution obtained in 2.3 with 4 ml of ethanol solution, then add 2 microliters of tetraethyl orthosilicate, stir for 20 minutes, the color changes from yellow to orange red, then add 0.1 ml of ammonia solution, and stir for 5 hours Self-assembled materials based on silver nanoparticles (a composite stru...

Embodiment 3

[0042] 3.1 Dissolve 0.0170 g of tannic acid into 20 ml of secondary water, and completely dissolve to obtain an aqueous solution of tannic acid for later use;

[0043] 3.2 Add potassium carbonate solution (0.1M) dropwise to the above 20ml tannic acid aqueous solution to adjust the pH of the solution to 6.5;

[0044] 3.3 Put the tannic acid aqueous solution with a pH of 6.5 obtained in 3.2 into a water-dissolving pot at 30°C to stabilize the temperature at the temperature of the water bath, then add 0.5 ml (0.1M) of silver nitrate aqueous solution dropwise, stir for 400 minutes, and centrifuge to In 10 milliliters of secondary water, an aqueous solution containing silver nanoparticles is obtained;

[0045] 3.4 Mix 0.5 ml of the aqueous solution containing silver nanoparticles obtained in 3.3 with 4 ml of ethanol solution, then add 0.1 ml of ammonia solution, then add 2 microliters of tetraethyl orthosilicate, stir for 300 min and centrifuge to obtain silver nanoparticle-based ...

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Abstract

The invention relates to a self-assembly material based on silver nanoparticles and a preparation method thereof. The constitution is characterized in that the center is a self-assembly body of Ag nanoparticles, the center is decorated with a layer of tannin, and an outermost layer is a sol gel SiO2 layer; the constitution is further characterized in that during a cladding process of silicon dioxide, by controlling the injection sequence of tetraethyl orthosilicate, a mononuclear composite structure or a multinuclear composite structure can be obtained, mononuclear silver nanoparticles or multinuclear silver nanoparticles are prepared, and the thichness of the SiO2 layer in outer layer is adjustable. The preparation method comprises the steps that first, the silver nanoparticles with tannin serving as a reducing agent and ligand are compounded, and then silicon dioxide cladding is conducted to the silver nanoparticles through a sol-gel method. The self-assembly material based on the silver nanoparticles and the preparation method thereof has the advantages that the method is simple, the mononuclear composite structure and the multinuclear composite structure are easy to achieve, and the composite structures are stable.

Description

technical field [0001] The invention relates to a self-assembly material based on silver nanoparticles and a preparation method thereof, belonging to the field of core-shell structure composite materials. Background technique [0002] Due to special properties such as small size effect and quantum tunneling effect, nanomaterials have received more and more attention. Among them, silver nanoparticles are widely used in the fields of optics, electricity, catalysis, sensing and biology due to their special properties of noble metal nanoparticles and their price advantage over other precious metals such as gold and platinum. [0003] The premise of the application of silver nanoparticles is to ensure the stability of the nanoparticles and the possibility of surface chemical modification. Among them, silica coating to form a core-shell structure is an ideal method to further stabilize the use of silver nanoparticles. This is because: first, the coating of silica nanoparticles ca...

Claims

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Application Information

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IPC IPC(8): B22F9/24B22F1/02
Inventor 杨萍张飞飞
Owner UNIV OF JINAN
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