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Magnetic composite powder for ferroferric oxide nanometer crystal modified carbon nanometer pipe and its preparation method

A technology of ferroferric oxide and carbon nanotubes, which is applied in the direction of magnetic objects, magnetic materials, inductors/transformers/magnets, etc., can solve the problems of few research reports on the orientation of carbon nanotubes, achieve high wrapping rate and simple process Effect

Inactive Publication Date: 2006-06-28
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the main methods that people take are directional growth of carbon nanotubes, utilization of an external electric field to orient carbon nanotubes, and biological template-guided method (L.A.Nagahara, I.Amlani, J.Lewenstein, R.K.Tsui, Appl.Phys.Lett, 2002, 80 , 3826; Z. Liu, Z. Shen, T. Zhu, S. Hou, L. Ying, Z. Shi, Z. Gu, Langmuir, 2000, 16, 3569; H. Xin, A. T. Woolley, J. Am. Chem.Soc.2003, 125, 8710), but there are still relatively few reports on the orientation of carbon nanotubes in a magnetic field

Method used

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  • Magnetic composite powder for ferroferric oxide nanometer crystal modified carbon nanometer pipe and its preparation method
  • Magnetic composite powder for ferroferric oxide nanometer crystal modified carbon nanometer pipe and its preparation method
  • Magnetic composite powder for ferroferric oxide nanometer crystal modified carbon nanometer pipe and its preparation method

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Embodiment 1

[0025] The multi-walled carbon nanotubes were baked in an oven at 140° C. for 24 hours to remove moisture in the carbon nanotubes, and then refluxed in concentrated nitric acid for 6 hours, washed with deionized water, and dried. 0.35g iron triacetylacetonate was dissolved in 50mL 2-pyrrolidone to obtain a red transparent solution. Add 100 mg of acid-treated carbon nanotubes to the above solution, ultrasonically disperse for 30 minutes, and then pour it into a three-necked bottle. One port of the three-necked bottle is connected to a condenser tube, and the other port is filled with nitrogen or argon gas, and refluxed in a silicone oil bath at 245 ° C. 0.5 hour, then naturally cooled to room temperature. A mixed solution of methanol / ether with a volume ratio of 1:3 was added to cause the product to settle, and then washed with acetone for 3 times, and dried to obtain a composite powder of carbon nanotubes wrapped with nano-Fe3O4. figure 1 The X-ray diffraction spectrum of the...

Embodiment 2

[0027] The multi-walled carbon nanotubes were baked in an oven at 140° C. for 24 hours to remove moisture in the carbon nanotubes, and then refluxed in concentrated nitric acid for 6 hours, washed with deionized water, and dried. 0.35g of ferric chloride was dissolved in 50mL of 2-pyrrolidone to obtain an orange-red transparent solution. Add 100 mg of acid-treated carbon nanotubes to the above solution, ultrasonically disperse for 60 minutes, and then pour it into a three-necked bottle. One port of the three-necked bottle is connected to a condenser tube, and the other port is filled with nitrogen or argon gas, and refluxed in a silicone oil bath at 245 ° C. 3 hours, then naturally cooled to room temperature. A mixed solution of methanol / ether with a volume ratio of 1:3 was added to cause the product to settle, washed with acetone for 5 times, and dried to obtain a composite powder of carbon nanotubes wrapped with nano-ferric oxide. figure 2 (b) is a transmission electron mi...

Embodiment 3

[0029] The multi-walled carbon nanotubes in Example 1 are replaced with single-walled carbon nanotubes, and other conditions remain unchanged, and a composite powder of ferric oxide / single-walled carbon nanotubes can be obtained. image 3 is the transmission electron microscope photo of the obtained typical ferroferric oxide / single-walled carbon nanotube composite material. At the mouth, the particle size is about 7nm. This structure is an ideal structure for single-walled carbon nanotubes to be used in electronic devices, because the ferroferric oxide is only located at its ports, and it only plays a directional guiding role and does not affect the physical properties of the tube body itself.

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Abstract

This invention relates to a magnetic compound powder of Fe3O4 nm grains for the decoration of C nm tubes and its preparation method characterizing in taking multi-wall or single wall C nm tubes, triacetyl-acetonyl or FeCl3 as the raw materials, 2-ketopyrrolidine as the solution to flow back for 0.5-2 hours protected by 240-250deg.C N or Ar, the character of the powder is: Fe3O4 nm particles cover the surface of the multi-wall nm tubes uniformly and most of the Fe3O4 particles of 6-10nm are at the open-end of the single-wall tubes. The magnetic compound powder has ferromagnetism and a trend of directional aggregation and keeps its state after the field is removed.

Description

Technical field: [0001] The invention relates to a nano-magnetic composite powder and a preparation method for in-situ synthesis, more precisely, to an in-situ coating of multi-walled carbon nanotubes by ferric oxide nanocrystals and in-situ modification by ferric oxide nanocrystals The invention relates to a nanocomposite powder at the end of a single-walled carbon nanotube and a preparation method thereof, belonging to the field of nanocomposite materials. technical background: [0002] Since S.Iijima discovered carbon nanotubes in 1991, carbon nanotubes have attracted great attention for their unique one-dimensional hollow structure and excellent mechanical, electronic and chemical properties. In particular, its remarkable electrical properties and good chemical stability make carbon nanotubes have broad application prospects in microelectronic devices such as large-scale integrated circuits, field emission transistors, and molecular diodes. At present, the realization o...

Claims

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Application Information

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IPC IPC(8): H01F1/00B22F1/02B22F9/00H01F41/02
Inventor 高濂单妍
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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