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Process of preparing carbon naotube foam

A technology of carbon nanotubes and foams, applied in nanotechnology, nanotechnology, nanostructure manufacturing, etc., can solve problems such as low porosity, impact on electrical and thermal conductivity, etc.

Inactive Publication Date: 2007-11-07
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Zhejiang University invented a method for preparing porous carbon nanotube preform (CN 1757596A), however, this preform contains organic polymer binder, the porosity is not high, and the organic polymer binder wherein makes electric conduction and heat conduction Performance is also severely affected

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] 1 gram of mixed acid-treated carbon nanotubes was dissolved in 80 ml of gelatin aqueous solution with a concentration of 1%, and after being stirred evenly, ultrasonic waves were used for about 30 minutes. Add 5 ml of ethanol solvent to the mixed solution, and stir for 60 minutes. The resulting product was placed in a graphite mold and kept under a pressure of 30 MPa for 15 minutes. Then take out the pressed tablet, put it in a vacuum drying oven at 120°C for 1 hour, and then put it under N 2 Keep the temperature at 400° C. for 3 hours under ambient conditions, and cool naturally to room temperature to obtain a porous carbon nanotube foam with an average pore diameter of 50 nanometers.

Embodiment 2

[0017] 1 gram of mixed acid-treated carbon nanotubes was dissolved in 80 ml of gelatin aqueous solution with a concentration of 3%, and after being stirred evenly, ultrasonic waves were used for about 60 minutes. Add 10 ml of ethanol solvent to the mixed solution, and stir for 60 minutes. The resulting product was placed in a graphite mold and kept under a pressure of 30 MPa for 15 minutes. Then take out the pressed tablet, put it in a vacuum drying oven at 120°C for 1 hour, and then put it under N 2 Keep the temperature at 400° C. for 3 hours under ambient conditions, and cool naturally to room temperature to obtain a porous carbon nanotube foam with an average pore diameter of 80 nanometers.

Embodiment 3

[0019] 1 gram of mixed acid-treated carbon nanotubes was dissolved in 120 ml of gelatin aqueous solution with a concentration of 8%, and after being stirred evenly, ultrasonic waves were used for about 80 minutes. Add 15 ml of butanol solvent to the mixed solution, and stir for 60 minutes. The resulting product was placed in a graphite mold and kept under a pressure of 50 MPa for 30 minutes. Then take out the pressed tablet, put it in a vacuum drying oven at 120°C for 1 hour, and then put it under N 2 Keep the temperature at 600° C. for 3 hours under ambient conditions, and cool naturally to room temperature to obtain a porous carbon nanotube foam with an average pore diameter of 120 nanometers.

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Abstract

The process of preparing carbon nanotube foam includes the following steps: mixing mixed acid treated carbon nanotube and 0.5-6 wt% concentration water solution of gelatin in the ratio of 1 g to 40-150 ml and ultrasonic treating for 10-60 min; adding organic solvent in 2-20 ml into the mixture solution and stirring until form elastomer; pressurizing the elastomer inside a graphite mold at 1-100 MPa for 10-40 min, vacuum drying at 50-200 deg.c for 1-5 hr, maintaining in N2 environment at 200-800 deg.c for 1-5 hr, and cooling to normal temperature to obtain the carbon nanotube foam. Thus produced carbon nanotube foam has no organic polymer adhesive contained, and adjustable porosity and pore size, and may be used in preparing composite material prefab and in producing biological rack material, biological carrier, catalyst carrier, etc.

Description

technical field [0001] The invention relates to a method for preparing a foam composed of carbon nanotubes. Background technique [0002] Carbon nanotubes have excellent electrical and thermal conductivity, high specific strength, low density and low thermal expansion coefficient, making them show great application potential as reinforcements of composite materials. To give full play to the advanced nature of the above-mentioned carbon nanotube modified composite materials, the key lies in whether the carbon nanotubes can be dispersed in the matrix at the nanometer level and form a firm bond with the matrix. However, compared with traditional carbon materials, carbon nanotubes not only have similar problems such as poor wettability with the matrix and prone to segregation, but also because they are one-dimensional nanomaterials with a large aspect ratio, they are easily entangled and agglomerated, making it difficult to achieve Monodisperse. One of the main reasons for the...

Claims

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Application Information

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IPC IPC(8): C01B31/02B82B3/00
Inventor 陈小华许龙山刘利利朱文海刘继磊张科杨植李文华易斌
Owner HUNAN UNIV
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