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Method for preparing Ag NPs particles with specified particle size

A particle and particle size technology, which is applied in the field of environmental materials research, can solve the problems of difficult to accurately control the synthetic particle size, low efficiency of AgNPs, and difficult collection of nano-silver, and achieve rapid synthesis, high yield and good effect

Active Publication Date: 2022-03-01
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nevertheless, the synthesized Ag NPs still have problems such as low efficiency, not uniform enough, difficult to precisely control the synthetic particle size, difficult to collect nano-silver, and easy to agglomerate.

Method used

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  • Method for preparing Ag NPs particles with specified particle size
  • Method for preparing Ag NPs particles with specified particle size
  • Method for preparing Ag NPs particles with specified particle size

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A method for preparing Ag-1 particles of Ag NPs with a specified particle size, comprising the steps of:

[0024] S1, according to the relationship formula between the mass concentration of Ag seeds, the concentration of silver nitrate solution and the diameter of Ag NPs with a specified particle size in the growth mixed solution:

[0025]

[0026] Known, the average diameter of Ag seed crystal is 20nm, and the diameter of the nano-silver of plan synthesis is 22nm, when the growth mixed solution that will prepare is limited to 50mL, the mass concentration of described polyvinylpyrrolidone is 1g / L, the silver nitrate solution The mass concentration is 150mg / L; the calculation shows that the Ag seed concentration is 52.5mg / L. Need to take 50mg of polyvinylpyrrolidone, 7.5mg of silver nitrate, and 2.625mg of Ag seeds; resuspend 2.625mg of Ag seeds with ultrapure water to obtain Ag seed solution, or directly take the solution containing 2.625mg of Ag seeds Ag seed solut...

Embodiment 2

[0031] A method for preparing Ag-2 particles of Ag NPs with a specified particle size, comprising the steps of:

[0032] S1, according to the relationship formula between the mass concentration of Ag seeds, the concentration of silver nitrate solution and the diameter of Ag NPs with a specified particle size in the growth mixed solution:

[0033]

[0034] Known, the average diameter of Ag seed crystal is 20nm, and the diameter of the nano-silver of plan synthesis is 41nm, when the growth mixed solution that will prepare is limited to 50mL, the mass concentration of described polyvinylpyrrolidone is 1g / L, the silver nitrate solution The mass concentration is 150mg / L; the calculation shows that the Ag seed concentration is 7.1mg / L. Need to take 50mg of polyvinylpyrrolidone, 7.5mg of silver nitrate, and 0.355mg of Ag seed; resuspend 0.355mg of Ag seed with ultrapure water to obtain Ag seed solution, or directly take the solution containing 0.355mg of Ag seed Ag seed crystal s...

Embodiment 3

[0039] A method for preparing Ag-3 particles of Ag NPs with a specified particle size, comprising the steps of:

[0040] S1, according to the relationship formula between the mass concentration of Ag seeds, the concentration of silver nitrate solution and the diameter of Ag NPs with a specified particle size in the growth mixed solution:

[0041]

[0042]Known, the average diameter of Ag seed crystal is 20nm, and the diameter of the nano-silver of plan synthesis is 64nm, when the growth mixed solution that wants to prepare is limited to 50mL, the mass concentration of described polyvinylpyrrolidone is 1g / L, the silver nitrate solution The mass concentration is 150mg / L; the calculation shows that the Ag seed concentration is 1.9mg / L. Need to take 50mg of polyvinylpyrrolidone, 7.5mg of silver nitrate, and 0.095mg of Ag seed; resuspend 2.625mg of Ag seed with ultrapure water to obtain Ag seed solution, or directly take the solution containing 0.095mg of Ag seed Ag seed crysta...

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Abstract

According to the method for preparing the Ag NPs particles with the specified particle size, by controlling the mass concentration of Ag seed crystals and the concentration of a silver nitrate solution in a growth mixed solution, the Ag NPs particles with the specified particle size are synthesized according to a relation formula of the mass concentration of the Ag seed crystals, the concentration of the silver nitrate solution and the diameter of the Ag NPs particles with the specified particle size, and the method is rapid in synthesis, easy to repeat, high in yield, uniform in synthesis particle size and good in effect. Meanwhile, by adjusting the PH value of the Ag NPs particle solution, the problem that Ag NPs particles are prone to agglomeration is solved, and the Ag NPs particles subjected to pH adjustment do not need to be protected by a large amount of dispersing agents and can be rapidly collected through a centrifugal method.

Description

technical field [0001] The invention relates to the field of environmental material research, in particular to a method for preparing Ag NPs particles with a specified particle size. Background technique [0002] Silver nanoparticles (Ag NPs) have attracted worldwide attention due to their unique optical, catalytic, sensing and antibacterial properties. The plasmon resonance effect of Ag NPs makes them have broad application prospects in biosensing, surface-enhanced Raman scattering spectroscopy, plasmonic nanolaser technology, and solar energy harvesting. Currently, wet chemical methods are commonly used to prepare Ag NPs with different sizes. The silver precursors selected for synthesis include silver nitrate, silver sulfate and other silver salts; according to the desired reaction rate, you can choose a reducing agent with strong or weak reducing ability, such as sodium borohydride, ascorbic acid, glucose, sodium citrate, etc. Usually, a stabilizer is added during the r...

Claims

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Application Information

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IPC IPC(8): B22F9/24B22F1/0545B82Y40/00
CPCB22F9/24B82Y40/00Y02E60/10
Inventor 范文宏梁丁元王祥瑞王颖
Owner BEIHANG UNIV
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