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Method for self-assembling carbon nano tubes in water by regulating temperature to guide polymer to modify carbon nano tubes

A technology of carbon nanotubes and acidified carbon nanotubes, applied in the fields of carbon compounds, chemical instruments and methods, inorganic chemistry, etc., can solve the problem of not reflecting the characteristics of one-dimensional materials, and achieve the effect of simple steps and easy realization.

Inactive Publication Date: 2014-07-16
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, much research has been done on how to improve the dispersion of carbon nanotubes and the compatibility with matrix materials, but uniformly dispersed carbon nanotubes are arranged randomly, and carbon nanotubes arranged in disorder are isotropic, reflecting properties of one-dimensional materials

Method used

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  • Method for self-assembling carbon nano tubes in water by regulating temperature to guide polymer to modify carbon nano tubes
  • Method for self-assembling carbon nano tubes in water by regulating temperature to guide polymer to modify carbon nano tubes
  • Method for self-assembling carbon nano tubes in water by regulating temperature to guide polymer to modify carbon nano tubes

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Example 1: Add 500 mg of multi-walled carbon nanotubes (tube outer diameter ≈ 15 nm) prepared by arc discharge method into 150 ml of concentrated nitric acid (65%), ultrasonically disperse for 10 minutes, and oxidize at 60° C. for 12 hours. After the reaction was completed, it was diluted and washed with deionized water, and separated by filtration until the filtrate was neutral. Vacuum drying at 50°C for 24 hours to obtain acidified carbon nanotubes; add 200 mg each of acidified carbon nanotubes and methyl cellulose to 50 ml of water, ultrasonically disperse for 10 minutes, and adsorb at 40°C for 48 hours to obtain carbon nanotubes with high methylcellulose adsorption capacity. After the adsorption, the temperature was raised to 80° C., centrifuged at a speed of 10,000 r / min for 30 minutes, and a self-assembled carbon nanotube was obtained at the bottom of the container. The length of the carbon nanotube self-assembled tube bundle is 25-40 μm, and the diameter is 3-6 μ...

Embodiment 2

[0027] Example 2: Add 500 mg of multi-walled carbon nanotubes (tube outer diameter ≈ 15 nm) prepared by chemical vapor deposition into 150 ml of concentrated nitric acid (65%), ultrasonically disperse for 10 minutes, and oxidize at 60° C. for 12 hours. After the reaction was completed, it was diluted and washed with deionized water, and separated by filtration until the filtrate was neutral. Vacuum dry at 50°C for 24 hours to obtain acidified carbon nanotubes; add 200 mg each of acidified carbon nanotubes and hydroxypropyl cellulose into 50 ml of ethanol, disperse with ultrasonic waves for 10 minutes, and absorb at 40°C for 48 hours. After being diluted and washed with ionized water and dispersed by ultrasonic waves, centrifuged again, repeated twice, to obtain carbon nanotubes with high adsorption capacity of hydroxypropyl cellulose. Disperse it in water, raise the temperature to 60°C, and let it stand for 24 hours, and the self-assembly of carbon nanotubes can be collected a...

Embodiment 3

[0028] Example 3: Add 200 mg of multi-walled carbon nanotubes prepared by laser evaporation (tube outer diameter ≈15 nm) and hydroxyethyl cellulose into 50 ml of methanol, ultrasonically disperse for 10 minutes, and absorb at 55° C. for 48 hours. After centrifugation, the bottom sediment was diluted and washed with deionized water and dispersed by ultrasonic waves, and then centrifuged again, repeated 10 times, to obtain carbon nanotubes with low hydroxyethyl cellulose adsorption capacity. Disperse it in water, lower the temperature to 20° C., and let it stand for 48 hours. The self-assembly of carbon nanotubes can be collected at the bottom of the container. The self-assembled body has a length of 25-40 μm and a diameter of 3-6 μm.

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Abstract

The invention relates to a method for guiding the self-assembly of polymer-modified carbon nanotubes in water through temperature regulation. Adsorb the polymer to the surface of the carbon nanotubes, then disperse the carbon nanotubes with the adsorbed polymers in water, change the temperature to make the carbon nanotubes self-assemble in the solvent, and separate the self-assembled carbon nanotubes by standing or centrifuging . The self-assembled body is a regular carbon nanotube bundle, which is composed of tens to thousands of highly oriented carbon nanotubes closely arranged in parallel. Self-assembly can concentrate and amplify the excellent performance of carbon nanotubes in the axial direction, so that carbon nanotubes have broader application prospects. The invention has simple steps and is easy to realize, self-assembly is carried out in water, no toxic organic solvent is used, and the invention is more environmentally friendly.

Description

technical field [0001] The invention relates to a method for self-assembly of carbon nanotubes modified by polymers in water through temperature regulation, using selected polymers to modify the surface of carbon nanotubes, so that the carbon nanotubes have the ability of self-assembly in water. The method can obtain highly oriented and parallel-arranged carbon nanotube bundles, and the self-assembled body has a regular shape and a micron-scale size. Background technique [0002] Iijima of Japan discovered carbon nanotubes in 1991. This one-dimensional nanomaterial is wound from single-layer or multi-layer graphite and has a hollow cylindrical structure. Carbon nanotubes have excellent mechanical, optical, electrical and thermal properties. They can not only be used as probes for detection instruments and sensors, nanowires and other microelectronic components, but also can be used to prepare reinforcing materials, conductive materials, thermal conductive materials, photoele...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B31/00C01B32/168
Inventor 王国建武英杰刘洋
Owner TONGJI UNIV
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