Method for purifying nano carbon fiber of multi-wall carbon nano-tube

A technology of multi-walled carbon nanotubes and carbon nanofibers, which is applied in the field of purification of carbon nanotubes/carbon nanofibers, can solve problems such as destruction, uneven oxidation reaction, structural integrity changes of carbon nanotubes/carbon nanofibers, and improve crystallization degree, improved structural integrity, and improved thermal stability

Inactive Publication Date: 2008-02-27
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this type of method also leads to changes in the structural integrity of carbon nanotubes / carbon nanofibers and even serious damage while purifying carbon nanotubes / carbon nanofibers, because although impurity carbon is oxidized before carbon nanotubes / carbon nanofibers in theory, but In actual operation, the conditions of air oxidation or strong acid oxidation are not easy to control, especially in the case of large processing capacity, there is inhomogeneity in the oxidation reaction, and it is difficult to ensure that carbon nanotubes / carbon nanofibers will not be etched

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  • Method for purifying nano carbon fiber of multi-wall carbon nano-tube
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Embodiment 1

[0021] The multi-walled carbon nanotube samples (diameter 20-100nm) prepared in batches by CCVD method are placed in a graphite crucible, then placed in a graphitization furnace, heated to 2500-2700°C under argon protection, the holding time is 60min, and cooled to Samples were taken out at room temperature. The film-like carbon nanotube samples after graphitization were crushed with a pulverizer (with a particle size of 10-100 mesh) for later use. Polymer dispersant (Dispers710) was prepared into a 0.08wt% solution with ethanol. Add 0.5 g of graphitized carbon nanotubes into 100 g of dispersant solution, stir magnetically for 60 min, and then vibrate ultrasonically for 20 min in an ultrasonic cleaner to obtain a black suspension of carbon nanotubes. Then filter the suspension with a 400-mesh filter, re-disperse the filter cake ultrasonically in ethanol, wash and filter it several times until the filtrate becomes colorless and clear. The finally obtained filter cake is purif...

Embodiment 2

[0024] The nano-carbon fiber samples (diameter 300-500nm) prepared in batches by CCVD were placed in a graphite crucible, then placed in a graphitization furnace, heated to 2200-2500°C under the protection of argon, and kept for 120 minutes, then cooled to room temperature and taken out. . The graphitized film-like carbon nanofiber samples were crushed with a pulverizer (with a particle size of 10-100 mesh) for later use. Sodium lauryl sulfate was prepared as a 0.1 wt% solution with water. Add 0.5 g of graphitized carbon nanofiber samples into 120 g of dispersant solution, stir magnetically for 60 minutes, and then vibrate ultrasonically for 90 minutes in an ultrasonic cleaner to obtain a suspension of black carbon nanofiber samples. Then filter the suspension with a 400-mesh filter, re-disperse the filter cake ultrasonically in water and wash and filter it several times until the filtrate becomes colorless and clear. The filter cake finally obtained is the purified nano-car...

Embodiment 3

[0026]The multi-walled carbon nanotube samples (diameter 20-100nm) prepared in batches by CCVD method are placed in a graphite crucible, then placed in a graphitization furnace, heated to 2800-2900°C under argon protection, the holding time is 30min, and cooled to Samples were taken out at room temperature. The film-like carbon nanotube samples after graphitization were crushed with a pulverizer (with a particle size of 10-100 mesh) for later use. The dispersant (Hydropalat 1080) was formulated as a 0.15 wt% solution in water. Add 0.5 g of graphitized carbon nanotubes into 100 g of dispersant solution, stir magnetically for 60 minutes, and then vibrate ultrasonically for 30 minutes in an ultrasonic cleaner to obtain a suspension of black carbon nanotubes. Then filter the suspension with a 400-mesh filter, re-disperse the filter cake ultrasonically in water and wash and filter it several times until the filtrate becomes colorless and clear. The finally obtained filter cake is...

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Abstract

The invention discloses a purifying technique of metal catalyst and carbon nanometer particle in the original sample of multi-wall carbon nanometer pipe / nanometer carbon fiber, which comprises the following steps: doing high-temperature graphitizing disposal (1800-3000 deg. c) for original multi-wall carbon nanometer pipe / nanometer carbon fiber to remove high-temperature effumable impurity, for example metal catalyst; eliminating the defect in the multi-wall nanometer carbon pipe; dispersing the graphitized carbon nanometer pipe / nanometer carbon fiber with different carbon structures evenly through dispersant solution under ultrasound; making different carbon structure form discrete phase; filtering to remove discrete carbon nanometer particle in the sample; obtaining high-purity product. The method has advantages of simple operation, high purify, easy manufacturing and so on.

Description

technical field [0001] The invention relates to a purification technology of carbon nanotubes / nano-carbon fibers, in particular to a method for purifying multi-walled carbon nanotubes / nano-carbon fibers. Background technique [0002] Carbon nanotubes / carbon nanofibers have attracted people's attention due to their unique structural characteristics, singular physical and chemical properties, and potential application value in high-tech fields in the future. They have become research frontiers and hotspots in the fields of physics, chemistry, biology, and materials. At present, the large-scale preparation of carbon nanotubes / carbon nanofibers mainly adopts arc method and catalytic chemical vapor deposition (CCVD), and the prepared carbon nanotubes / carbon nanofibers are often accompanied by more or less impurities, such as metal Catalysts and carbon impurities such as amorphous carbon, fullerenes, and carbon nanoparticles, especially industrially produced carbon nanotubes / carbo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02C30B29/02C30B29/62
Inventor 成会明张辉李峰孙成华
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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