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Preparation method of magnetic carbon nanotube with polydopamine-modified surface

A technology of magnetic carbon nanotubes and polydopamine, which is applied in the field of nanomaterials, can solve the problems of difficult surface modification, reduced magnetism, and easy oxidation of nanomagnetic particles, and achieve the effect of rapid separation and enrichment and stable structure

Active Publication Date: 2014-10-01
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, nano-magnetic particles are easily oxidized to reduce their magnetic properties, and the surface is not easy to modify

Method used

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  • Preparation method of magnetic carbon nanotube with polydopamine-modified surface
  • Preparation method of magnetic carbon nanotube with polydopamine-modified surface
  • Preparation method of magnetic carbon nanotube with polydopamine-modified surface

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (a) Weigh FeCl respectively 3 ·6H 2 O0.5g and 2.0g of anhydrous sodium acetate were dissolved in 7mL of ethylene glycol and 13mL of diethylene glycol and mixed evenly, placed in a high-pressure reactor, the reaction temperature was 190°C, the reaction time was 12h, and the reaction pressure was 1-6Mpa. After the reaction is finished, cool down to room temperature naturally. In the presence of an external magnetic field, separate the solid compound in the reaction kettle, wash with deionized water and absolute ethanol for 3-6 times, remove the residual organic solvent in the product, and dry it in vacuum. to obtain magnetic nanoparticles.

[0031] (b) Weigh 0.8g of magnetic nanoparticles and 0.2g of carbon nanotubes and dissolve them in 50mL of ethylene glycol, sonicate at 30°C for 3h, and then 400r min -1 Stir the mixture at a high speed for 30 min to obtain a homogeneous mixture.

[0032] (c) Transfer the mixed solution obtained in step (b) to a sealed stainless ste...

Embodiment 2

[0035] (a) Weigh FeCl respectively 3 ·6H 2 O0.5g and 2.0g of anhydrous sodium acetate were dissolved in 10mL of ethylene glycol and 10mL of diethylene glycol and mixed evenly, placed in a high-pressure reactor, the reaction temperature was 210°C, the reaction time was 6h, and the reaction pressure was 1-6Mpa. After the reaction is finished, cool down to room temperature naturally. In the presence of an external magnetic field, separate the solid compound in the reaction kettle, wash with deionized water and absolute ethanol for 3-6 times, remove the residual organic solvent in the product, and dry it in vacuum. to obtain magnetic nanoparticles.

[0036] (b) Weigh 0.8g of magnetic nanoparticles and 0.2g of carbon nanotubes and dissolve them in 40mL of ethylene glycol, sonicate at 40°C for 2h, and then 250r min -1 Stir the mixture at a high speed for 60 min to obtain a homogeneous mixture.

[0037] (c) Transfer the solution obtained in step (b) to a sealed stainless steel aut...

Embodiment 3

[0040] (a) Weigh FeCl respectively 3 ·6H 2O1.0g and 2.0g of anhydrous sodium acetate were dissolved in 10mL of ethylene glycol and 10mL of diethylene glycol, mixed evenly, placed in a high-pressure reactor, the reaction temperature was 200°C, the reaction time was 12h, and the reaction pressure was 1-6Mpa. After the reaction is finished, cool down to room temperature naturally. In the presence of an external magnetic field, separate the solid compound in the reaction kettle, wash with deionized water and absolute ethanol for 3-6 times, remove the residual organic solvent in the product, and dry it in vacuum. to obtain magnetic nanoparticles.

[0041] (b) Weigh 0.6g of magnetic nanoparticles and 0.2g of carbon nanotubes and dissolve them in 30mL of ethylene glycol, sonicate at 40°C for 3h, and then use 300r min -1 Stir the mixture at a high speed for 60 min to obtain a homogeneous mixture.

[0042] (c) Transfer the solution obtained in step (b) to a sealed stainless steel au...

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Abstract

The invention discloses a preparation method of a magnetic carbon nanotube with polydopamine-modified surface, belonging to the field of nanomaterial preparation. The method comprises the following steps: synthesizing magnetic nanoparticles by adopting a solvothermal method; adding the magnetic nanoparticles and a carbon nanotube into ethanediol according to a certain ratio, stirring and ultrasonically processing to obtain a uniform solution, and performing solvothermal reaction on the solution to obtain the magnetic carbon nanotube; dissolving the obtained magnetic carbon nanotube and dopamine in Tris-HCl buffer liquid according to a certain ratio, and polymerizing for a certain time to obtain the magnetic carbon nanotube with the polydopamine-modified surface. The magnetic carbon nanotube prepared by adopting the method has ultrastrong mechanical property of the carbon nanotube, the characteristics of nanometer size effect, relatively good biocompatibility, magnetic responsibility and the like of the magnetic particles and the characteristics of hydrophilicity, structural stability and a secondary reaction platform of dopamine, and can be widely applied in the fields of biology such as protein separation, drug delivery and biological marking.

Description

【Technical field】 [0001] The invention belongs to the technical field of nanometer materials, and in particular relates to a method for preparing magnetic carbon nanotubes whose surface is modified by polydopamine. 【Background technique】 [0002] Since Lijima reported the discovery of carbon nanotubes in 1991, carbon nanotubes have been favored by many scientists for their unique topology, super mechanical properties, good heat transfer and electrical conductivity, and some chemical properties. Research hotspot in the field of nano functional materials. Carbon nanotubes have a large aspect ratio and are quasi-one-dimensional quantum wires. Therefore, it has extremely broad application prospects in the fields of nanometer equipment, microelectronics, and functional composite materials. Magnetic nanomaterials have the characteristics of nanometer size effect, good biocompatibility and magnetic responsiveness, and can be easily and rapidly separated under the action of an ext...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G73/02C08K7/00C08K3/04C08K3/22
Inventor 高瑞霞张丽丽赵思奇唐玉海
Owner XI AN JIAOTONG UNIV
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