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Preparation method of multi-pore canal nuclear shell type magnet gold compound nano-particle

A technology of composite nanoparticles and composite nanomaterials, applied in the direction of magnetic materials, magnetic objects, inorganic materials, etc., can solve the problems of poor chemical stability of magnetic nanoparticles, easy to be oxidized or agglomerated, unfavorable recoupling of biomolecules, etc. To achieve the effect of avoiding severe decline

Inactive Publication Date: 2010-04-14
SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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Problems solved by technology

In order to ensure that the optical and catalytic properties of gold nanoparticles are not shielded by the surface coating layer, it is often reported in the literature that gold nanoparticles are directly combined with magnetic nanoparticles (or magnetic nanoparticles coated with inorganic or organic polymer materials). However, the magnetic-gold composite nanoparticles with this structure have the following problems in current applications: (1) The chemical stability of the magnetic nanoparticles is poor, and they are easily oxidized or agglomerated , if the magnetic particles are pre-coated by inorganic or organic polymer materials, the magnetic response sensitivity of the obtained magnetic gold composite nanoparticles is not enough; (2) the number of effective functional groups contained on the surface of the composite nanoparticles is relatively limited, which is not conducive to the regeneration of biomolecules. coupling
However, due to the limitation of the pore size of the silica shell on the surface of magnetic nanoparticles, it is difficult to inlay gold nanoparticles and the yield is low.

Method used

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  • Preparation method of multi-pore canal nuclear shell type magnet gold compound nano-particle

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preparation example Construction

[0018] The invention provides a method for preparing porous core-shell magnetic gold composite nanoparticles, which mainly includes the following steps:

[0019] (1) Ultrasonic disperse the hydrophilic magnetic nanoparticles in the sugar solution, transfer to a reaction kettle, and react at 160-200° C. for 4-8 hours. After the reaction, the homogeneously nucleated carbon spheres were removed by magnetic separation, and the obtained carbon spheres coated with magnetic particles were washed three times with deionized water, and then dried in a vacuum oven at 60°C for 24 hours.

[0020] (2) Take 100 mg of carbon spheres coated with magnetic cores, disperse them ultrasonically in secondary water at 0.5-20 mg / mL, and add dropwise 10-500 micrograms of chloroauric acid solution with a mass fraction of 1%-5% after reflux for 5 min. liter, continue to reflux for 20-120min, the color of the solution gradually changes from yellowish brown to red, and a magnetic composite nanomaterial wit...

Embodiment 1

[0032] Weigh 100mg of Fe with an average particle size of 10nm 3 o 4 Nanoparticles were ultrasonically dispersed in 30ml of an aqueous solution containing 0.5g of glucose, and the dispersion was transferred to a reaction kettle and reacted at 170°C for 4h. After the reaction, cool to room temperature, and remove the homogeneous nucleated carbon spheres by magnetic separation to obtain carbon spheres containing magnetic particles. The thickness of the carbon layer is about 1nm. Wash it three times with deionized water and place it in a vacuum drying oven. Dry at 60°C for 24h. Take 100 mg of carbon spheres containing magnetic cores in the resulting mixture, ultrasonically disperse them in 20 ml of water at a rate of 5 mg / mL, add 500 microliters of chloroauric acid solution with a mass fraction of 1% after reflux for 5 minutes, and continue to reflux for 20 minutes. The color of the solution changes from yellowish brown to is red, and the magnetic composite nanomaterial with go...

Embodiment 2

[0035] Weigh 100mg of Fe with an average particle size of 10nm 3 o 4 Nanoparticles were ultrasonically dispersed in 30ml of an aqueous solution containing 0.5g of glucose, and the dispersion was transferred to a reaction kettle and reacted at 170°C for 4h. After the reaction, cool to room temperature, and remove the homogeneous nucleated carbon spheres by magnetic separation to obtain carbon spheres containing magnetic particles. The thickness of the carbon layer is about 1nm. Wash it three times with deionized water and place it in a vacuum drying oven. Dry at 60°C for 24h. Take 100 mg of carbon spheres containing magnetic cores in the resulting mixture, ultrasonically disperse them in 20 ml of water at a rate of 5 mg / mL, add 300 microliters of chloroauric acid solution with a mass fraction of 1% after reflux for 5 minutes, and continue to reflux for 20 minutes. The color of the solution changes from yellowish brown to is red, and the magnetic composite nanomaterial with go...

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Abstract

The invention discloses a preparation method of multi-pore canal nuclear shell type magnet gold compound nano-particles, which comprises the following characteristic steps of reacting hydrophilic magnetic nano-material with sugar solution under the closed environment at 160-200 DEG C to obtain a carbon ball cladded with magnetic nucleus; chemically modifying gold nano-particles by adopting a reflux method on the carbon ball cladded with the magnetic nucleus to obtain the magnetic gold compound nano-material; then cladding a shell layer on the magnetic gold compound nano-material by a method of silica source hydrolysis or titanium source hydrolysis to form nuclear shell particles, and modifying the nuclear shell particle surfaces with polymer materials, wherein the feeding mole ratio of the polymer materials to the nuclear shell particles is 5:1; and finally etching the nuclear shell type magnetic gold compound nano-particles modified with the polymer materials by adopting inorganic alkali solution to form multi-pore canal nuclear shell type magnetic gold compound nano-particles. The magnetic gold compound nano-particles prepared by the invention has the characteristics of uniform and controllable particle diameter, good dispersity and little influence on magnetic property and optical property from surface inorganic layers.

Description

technical field [0001] The invention relates to a method for preparing nanoparticles, in particular to a method for preparing porous core-shell magnetic-gold composite nanoparticles. Background technique [0002] The composite nanoparticles formed by composite assembly of magnetic particles and gold nanoparticles not only have the magnetron guidance and magnetic separation characteristics of magnetic nanomaterials, but also have the unique optical properties and catalytic properties of gold nanoparticles. Hot topics in research fields such as chemistry and catalysis. The performance and application effect of such composite functional nanoparticles are greatly affected by their structure. In order to ensure that the optical and catalytic properties of gold nanoparticles are not shielded by the surface coating layer, it is often reported in the literature that gold nanoparticles are directly combined with magnetic nanoparticles (or magnetic nanoparticles coated with inorganic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/047H01F1/10B22F1/02
Inventor 张智军陈凤华黄洁
Owner SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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