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Method for preparing gold colloidal nanaparticles

A nano-gold and particle technology is applied in the field of preparation of gold nanoparticles, which can solve the problems of uneven distribution, unfavorable production and preparation, and difficult particle size control, and achieves the effect of easy particle size and continuous large-scale production.

Inactive Publication Date: 2006-07-26
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The operation process of these methods is more complicated, and the particle size is not easy to control, and the obtained nano-gold particles greatly reduce its catalytic activity due to the thicker surface coating layer.
Most importantly, none of these methods can achieve continuous large-scale preparation, and the preparation process will cause varying degrees of pollution to the environment
However, in the traditional photochemical preparation method, not only the light utilization rate is low, but also the particle size is large and the distribution is uneven, which is not conducive to large-scale production and preparation.

Method used

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  • Method for preparing gold colloidal nanaparticles

Examples

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Effect test

Embodiment 1

[0010] Embodiment 1, referring to accompanying drawing, at first, prepare the mixed solution of K15 and citric acid, make the concentration of K15 in the solution be 5mg / mL, citric acid concentration be 1mg / mL; Then, the chloroauric acid that concentration is 80 μ g / mL The aqueous solution of K15 and the mixed solution of K15 and citric acid are injected simultaneously at the flow rate of 6mL / min by dual-channel constant-flow pump 3 respectively. Under the irradiation wavelength of 253.7nm and the power of 14W ultraviolet lamp 2, the pipe diameter is 1mm and the screw pitch is 1mm. A quartz serpentine tube 1 with a tube length of 30 cm can obtain colloidal gold nanoparticles with an average particle diameter of 1.5 nm.

Embodiment 2

[0011] Embodiment 2, at first, prepare the mixed solution of K25 and citric acid, make the concentration of K25 in the solution be 2.5mg / mL, the concentration of citric acid is 0.8mg / mL; The mixed solution of K25 and citric acid was injected simultaneously with the flow rate of 30mL / min by dual-channel constant-flow pump 3 respectively. The tube diameter under the irradiation wavelength of 253.7nm and the power of 200W ultraviolet lamp 2 was 10mm, and the thread pitch was 5mm. The quartz serpentine tube 1 with a length of 100 cm can obtain colloidal gold nanoparticles with an average particle diameter of 2 nm.

Embodiment 3

[0012] Embodiment 3, at first, prepare the mixed solution of K30 and citric acid, make the concentration of K30 in the solution be 10mg / mL, citric acid concentration be 6.4mg / mL; Then, be the aqueous solution of the chloroauric acid of 800 μ g / mL and The mixed solution of K30 and citric acid is injected simultaneously with the flow rate of 60mL / min by dual-channel constant flow pump 3 respectively. The tube diameter under the radiation wavelength of 300nm and the power of 500W ultraviolet lamp 2 is 5mm, the thread pitch is 20mm, and the tube length is A 200 cm quartz serpentine tube 1 can obtain colloidal gold nanoparticles with an average particle diameter of 5 nm.

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Abstract

The invention relates the method for preparation of nanometer gold particle, comprising the following step: making the mixture solution of PVP and citric acid, adding chlorauric acid solution, and injecting the mixture solution into quartz coiled pipe which is irradiated by ultraviolet lamp, the radiated wave length of ultraviolet lamp being 253.7-300nm, and the power of ultraviolet lamp being 14-2000W. Using the method, the grain-size distribution of nanometer gold particle is homogeneous, the particle sizes are easy to control, the least mean particle diameter is 1.5nm, and no poison material and the polluted material are produced.

Description

technical field [0001] The invention relates to a method for preparing gold nanoparticles, in particular to a method for continuously preparing colloidal nano-gold particles with an average particle diameter of less than 10 nanometers in large quantities by adopting a photochemical method. technical background [0002] Nano-gold particles have huge potential application prospects in the fields of nano-electronics, optoelectronic devices, nano-coating materials, and nano-catalysis. For example, in the field of catalysis, gold nanoparticles with a particle size of less than 10 nm have extremely high catalytic oxidation activity for carbon monoxide and glucose. Therefore, the preparation of nano-gold particles, especially the preparation of nano-gold particles with a uniform size distribution and a particle size of less than 10 nm, is still a hot spot in the field of nanomaterials. [0003] There have been many literature reports on the preparation methods of nano-gold particl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24
Inventor 杨生春张太蔚张露杨志懋丁秉钧王仕兴
Owner XI AN JIAOTONG UNIV
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