Magnetic graphene oxide composite nanomaterial and preparation method thereof

A technology of composite nanomaterials and magnetic nanoparticles, applied in chemical instruments and methods, other chemical processes, etc., can solve the problems of changing the physical and chemical properties of graphene oxide, affecting the performance of magnetic graphene oxide, and graphene oxide is easy to agglomerate, etc. , to achieve excellent biocompatibility and hydrophilicity, mild conditions, good dispersion and hydrophilicity

Inactive Publication Date: 2017-04-26
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of covalent bonding, the condensation reagent is easy to change the pH of the reaction solution, which leads to the easy aggregation of graphene oxide, changes the physical and chemical properties of graphene oxide, and affects the performance of magnetic graphene oxide.

Method used

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  • Magnetic graphene oxide composite nanomaterial and preparation method thereof
  • Magnetic graphene oxide composite nanomaterial and preparation method thereof
  • Magnetic graphene oxide composite nanomaterial and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] 1. Preparation of magnetic graphene oxide composite nanomaterials: according to figure 1 As shown, weigh 1.08g of hexahydrate, ferric chloride and 0.2g of sodium citrate, disperse them in 20mL of ethylene glycol, then add 1.2g of anhydrous sodium acetate, stir vigorously for 30min after ultrasonication for 30min, and prepare a uniform solution , and finally loaded into a polytetrafluoroethylene reactor, with a pressure of 5MPa, and reacted at 200°C for 10h. The obtained product was alternately washed three times with deionized water and absolute ethanol, and dried in vacuum at a drying temperature of 60°C and a drying time of 12h. , to prepare citric acid-stabilized magnetic nanoparticles.

[0040] Weigh 10mg of magnetic nanoparticles and disperse them in 50mL of 10mM Tris-HCl buffer solution. The pH of the solution is 8.0. Then add 10mg of dopamine. After shaking evenly, stir and react in a water bath at 25°C for 2h. The anhydrous ethanol was alternately washed three ...

Embodiment 2

[0048] Preparation of Magnetic Graphene Oxide Composite Nanomaterials: According to figure 1 As shown, weigh 1.08g of hexahydrate, ferric chloride and 0.2g of sodium citrate, disperse them in 20mL of ethylene glycol, then add 1.2g of anhydrous sodium acetate, stir vigorously for 30min after ultrasonication for 30min, and prepare a uniform solution , and finally loaded into a polytetrafluoroethylene reactor, pressure 5MPa, reacted at 200°C for 14h, the resulting product was washed alternately with deionized water and absolute ethanol three times, and dried in vacuum at a drying temperature of 60°C and a drying time of 12h , to prepare citric acid-stabilized magnetic nanoparticles.

[0049] Weigh 10 mg of magnetic nanoparticles and disperse them in 50 mL of 10 mM Tris-HCl buffer solution. The pH of the solution is 8.0. Then add 10 mg of dopamine. After shaking evenly, stir and react in a water bath at 25°C for 6 hours. Alternately washing with water and ethanol for three times,...

Embodiment 3

[0052] Preparation of magnetic graphene oxide composite nanomaterials:

[0053] according to figure 1 As shown, weigh 1.08g of hexahydrate, ferric chloride and 0.2g of sodium citrate, and disperse them in 20mL of ethylene glycol, then add 1.2g of anhydrous sodium acetate, stir vigorously for 30min after ultrasonication for 30min, and prepare a uniform solution , and finally loaded into a polytetrafluoroethylene reactor, with a pressure of 5MPa, and reacted at 200°C for 10h. The obtained product was alternately washed with deionized water and absolute ethanol three times, and dried in vacuum at a drying temperature of 60°C and a drying time of 12h. , to prepare citric acid-stabilized magnetic nanoparticles.

[0054] Weigh 10 mg of magnetic nanoparticles and disperse them in 50 mL of 10 mM Tris-HCl buffer solution, the pH of the solution is 8.0, then add 20 mg of dopamine, shake evenly, stir and react in a water bath at 25 °C for 2 h, and wash the product alternately with deion...

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Abstract

The invention relates to a magnetic graphene oxide composite nanomaterial and a preparation method thereof. The material is prepared from graphene oxide, magnetic nano particles and a polydopamine shell layer; graphene oxide is connected with the magnetic nano particles wrapped by polydopamine, polydopamine serves as a connecting arm between the magnetic nano particles and graphene oxide, and the magnetic nano particles are immobilized on the surface of graphene oxide. When the material is prepared, the magnetic nano particles with stable citric acid are firstly prepared according to a solvothermal method, and then the surfaces of the magnetic nano particles are wrapped by the polydopamine shell layer in an alkaline buffer solution; finally, hydrogen bonds between polydopamine and graphene oxide and pi-pi interact, and the magnetic graphene oxide composite nanomaterial is prepared. The material has the common properties of graphene oxide and the magnetic nano particles, the hydrophilic performance of the material is improved through introduction of polydopamine, and the method is mild in condition and high in expansibility, and preparation is easy and convenient.

Description

technical field [0001] The invention relates to a magnetic graphene oxide composite nano material and a preparation method. Background technique [0002] Since its discovery in 2004, graphene has attracted extensive attention in the fields of energy, catalysis and electronic devices, environmental chemistry and biomedicine due to its excellent optical, electrical, mechanical and thermal properties. Graphene is a two-dimensional crystal with a single atomic layer of carbon atoms. Graphene oxide, as an important precursor for the preparation of graphene by reduction method, has a similar structure to graphite, with a large specific surface area and a special layered structure, but a large number of oxygen-containing groups, such as carboxyl, hydroxyl, ring, etc., are introduced into the graphene sheet structure. Oxygen and carbonyl etc. The presence of oxygen-containing groups improves the stability and hydrophilicity of graphene oxide, and also provides reaction sites for t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26B01J20/32
CPCB01J20/26B01J20/0288B01J20/20B01J20/28009B01J20/28016B01J20/3217B01J2220/4806B01J2220/4812
Inventor 张丽华江波陈远波吴琼张玉奎
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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