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Preparation method of magnetic controlled ultra paramagnetism nanometer carbon pipe

A technology of superparamagnetic and carbon nanotubes, applied in nanostructure manufacturing, nanotechnology, nanotechnology, etc., can solve the problem of uneven coating of carbon nanotube magnetic particles, inability to effectively control the size of magnetic particles, and the shape of nanocarbon The degree of tube coverage, the inability to accurately control the magnetization and magnetic response characteristics of magnetic carbon nanotubes, etc., to achieve uniform and controllable size, controllable coating degree, and low cost

Inactive Publication Date: 2007-07-18
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the inhomogeneous coating of magnetic particles on the surface of carbon nanotubes obtained by the existing self-assembly and in-situ synthesis methods, and the inability to effectively control the size, shape and coverage of the magnetic particles on the carbon nanotubes The diameter of the magnetic particles is more than 20 nanometers, so there is a problem that the magnetization and magnetic response characteristics of the magnetic carbon nanotubes cannot be precisely controlled; and a method for preparing magnetically controllable superparamagnetic carbon nanotubes is proposed.

Method used

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Examples

Experimental program
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specific Embodiment approach 1

[0015] Specific embodiment one: the preparation method step of this embodiment is:

[0016] 1. Add 1 to 100 mg of carbon nanotubes per milliliter of polyol solution, and ultrasonically disperse for 5 to 30 minutes;

[0017] 2. Add 1 to 100 mg of metal organic iron compound or inorganic iron salt to each milliliter of the above-mentioned mixed solution under stirring conditions;

[0018] 3. Stir the above mixed solution under the protection of inert gas, heat to boiling at a heating rate of 1-10°C / min, and keep refluxing for 10 minutes to 12 hours;

[0019] 4. Stop heating the above mixed solution and allow the mixed solution to cool to room temperature;

[0020] 5. Add a low-polar solvent or non-polar solvent to the above mixed solution, the volume ratio of the low-polar solvent or non-polar solvent to the polyol solution is 1:1, the mixed solution is flocculated and precipitated, and then the precipitate is separated by a magnet Suck to the bottom of the container, pour off...

specific Embodiment approach 2

[0021] Specific embodiment two: the difference between this embodiment and specific embodiment one is that the polyhydric alcohol in step one of the preparation method is ethylene glycol, propylene glycol, isopropylene glycol, glycerol (glycerol), diethylene glycol Alcohol, triethylene glycol, tetraethylene glycol or polyethylene glycol high-boiling polyols with a molecular weight of M≤5000. Other method steps are the same as those in the first embodiment.

specific Embodiment approach 3

[0022] Embodiment 3: The difference between this embodiment and Embodiment 1 is that in step 1 of the preparation method, 3 mg of carbon nanotubes are added to each milliliter of polyol solution. Other method steps are the same as those in the first embodiment.

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Abstract

This invention relates to a preparation method of magnetism controllable superparamagnetism nanometer carbon tube, it relates to preparation technique domain of superparamagnetism nanometer carbon tube. Its preparation step is: 1. add nanometer carbon tube in polyalcohol, disperse with super sound; 2. add metallic organic iron compound or inorganic iron salt; 3. heat to boiling; 4. cool to room temperature; 5. add low polar solvent or nonpolar solvent, flocculate and precipitate, adsorb by magnet, dry, and get magnetic nanometer carbon tube. This invention has high reaction efficiency. Size of ferric oxide nanoparticle is uniform and controllable. Diameter is between 4-20 nanometers. Wrapping degree is uniform and controllable. It can exactly control magnetism of prepared magnetic nanometer carbon tube.

Description

technical field [0001] The invention relates to the technical field of preparation of superparamagnetic nanometer carbon tubes. Background technique [0002] Carbon nanotubes are very important new nanomaterials with excellent properties, and have attracted widespread attention since they were discovered in 1991. Carbon nanotubes are composed of curled seamless and hollow graphite sheets, and can generally be divided into single-walled carbon nanotubes and multi-walled carbon nanotubes. Theoretical predictions and experimental studies have shown that carbon nanotubes have unique electrical, magnetic, optical and mechanical properties, and have broad application prospects in quantum computers, flat panel displays, aerospace, hydrogen storage materials, biomedicine and other fields. Research on carbon nanotubes is a hotspot and frontier in the fields of physics, chemistry and material science. In the many practical applications of carbon nanotubes, uniformly dispersing carbo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02B82B3/00H01F1/01
Inventor 蔡伟万家齐冯江涛
Owner HARBIN INST OF TECH
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