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Method for preparing nano silver particles with controllable grain size uniform size through seed growth method

A technology of nano-silver particles and particle size, which is applied in the direction of nanotechnology, can solve the problem of uncontrollable size of nano-silver particles, and achieve the effect of controllable size and uniform particle size

Inactive Publication Date: 2018-03-13
QINGDAO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a method for preparing nano-silver particles with uniform size and controllable particle size by seed growth method, which solves the problem that the size of nano-silver particles produced by the current preparation method of nano-silver particles is uncontrollable

Method used

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  • Method for preparing nano silver particles with controllable grain size uniform size through seed growth method
  • Method for preparing nano silver particles with controllable grain size uniform size through seed growth method
  • Method for preparing nano silver particles with controllable grain size uniform size through seed growth method

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Example 1: Preparation of nano-silver seeds with uniform particle size distribution around 5-8nm;

[0022] Add 1mL (2.5×10 3 mol / L) silver nitrate solution, then add 1.mL (0.01mol / L) mercaptoethanol, stir in an ice water bath and add 1.5mL (2.5×10 3 mol / L) sodium citrate, then add 0.16mL NaBH with a concentration of 0.1mol / L dropwise 4 , Stirring the reaction during the dropping process. After the reaction, the centrifuge tube containing the reaction solution is placed in a centrifuge at a temperature of 25°C. After centrifugation, the supernatant is removed, and the remaining liquid is the prepared nano silver particles after repeated washing with three-distilled water for 2-3 times. Its UV spectrum is as follows figure 1 As shown, its characteristic absorption peak is: 397nm, and its transmission electron microscope is as figure 2 Shown.

Embodiment 2

[0023] Example 2: Preparation of nano silver particles with uniform particle size distribution around 9-12 nm;

[0024] Add 2ml of the seed solution of Example 1 to a 25mL round-bottomed flask equipped with magnets and then add 1.5mL (2.5×10 3 mol / L) Silver nitrate solution is added dropwise to 0.18mL NaBH with a concentration of 0.1mol / L 4 , Stirring the reaction during the dropping process. After the reaction, the centrifuge tube containing the reaction solution is placed in a centrifuge at a temperature of 25°C. After centrifugation, the supernatant is removed, and the remaining liquid is the prepared nano silver particles after repeated washing with three-distilled water for 2-3 times. Its UV spectrum is as follows image 3 As shown, its characteristic absorption peak is 399nm.

Embodiment 3

[0025] Example 3: Preparation of nano silver particles with uniform particle size distribution around 13-16 nm;

[0026] Add 2ml of the seed solution of Example 1 into a 25mL round-bottomed flask equipped with magnets and then add 2mL (2.5×10 3 mol / L) Silver nitrate solution was added dropwise to 0.24mL NaBH with a concentration of 0.1mol / L 4 , Stirring the reaction during the dropping process. After the reaction, the centrifuge tube containing the reaction solution is placed in a centrifuge at a temperature of 25°C. After centrifugation, the supernatant is removed, and the remaining liquid is the prepared nano silver particles after repeated washing with three-distilled water for 2-3 times. Its UV spectrum is as follows Figure 4 As shown, the characteristic absorption peak is 401 nm.

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Abstract

The invention discloses a method for preparing preparing nano silver particles with controllable grain size uniform size through a seed growth method. In an ice-water bath, sulfhydryl compound and a silver source solution are mixed, and then are pre-protected, a weak reducing agent is added, in the ice-water bath, a strong ice reducing agent is added dropwise for reducing the silver source solution, stirring is carried out, the small-size nano silver particles with the uniform grain size are obtained, the nano silver particles serve as seeds, a certain amount of silver source solution is addedcontinuously, the strong reducing agent is used for reducing, and the controllable growing nano silver particles are obtained. The method has the beneficial effects that the produced nano silver particle products are uniform in grain size, and the size is controllable.

Description

Technical field [0001] The invention belongs to the technical field of inorganic synthesis, and relates to a method for preparing nano-silver particles with a uniform particle size and a controllable size. Background technique [0002] In recent years, nano-silver particles have received extensive attention from researchers due to their special physical and chemical properties. They have been widely used in the fields of bioimaging technology, biomedical sensing and catalysis. Recently, researchers have conducted various in-depth studies and explorations on the basis of nano-silver particles as precursors, such as preparing nano-gold cages with different morphologies, and combining nano-silver particles with biological DNA to enhance their fluorescence characteristics. The surface of nano silver is coated with silica and rare earth complexes or other substances to enhance optical properties and other experiments. These experiments all use nano-silver particles as the matrix, and...

Claims

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Application Information

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IPC IPC(8): B22F9/24B82Y40/00
CPCB22F9/24B82Y40/00
Inventor 刘继宪张治唐建国王瑶梁虎威
Owner QINGDAO UNIV
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