Preparation method of carbon nano-tube composite material with enhancing characteristics

A technology of carbon nanotubes and composite materials, applied in the fields of nanotechnology, carbon compounds, nanotechnology for materials and surface science, and can solve the problems of low mechanical strength and electrical conductivity of fibers

Inactive Publication Date: 2013-11-20
常熟苏大低碳应用技术研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem of low mechanical strength and electrical conductivity of fibers assembled with carbon nanotubes

Method used

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  • Preparation method of carbon nano-tube composite material with enhancing characteristics
  • Preparation method of carbon nano-tube composite material with enhancing characteristics
  • Preparation method of carbon nano-tube composite material with enhancing characteristics

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] The preparation process of the precursor solution of TiC-embedded CNT composite fiber is as follows: 12 g of hexafluorotitanic acid (H 2 TiF 6 , ALDRICH, 99.9%, 60%) was added to 40 mL of pure water (18 MΩ, MILLI-Q water treatment system) dissolving 7.5 g of polyethyleneimine (PEI, BASF Company, Clifton New Jersey, without further treatment) in solution. The resulting solution was filtered using an Amicon ultrafiltration system with an ultrafiltration membrane under 60 psi argon pressure to remove impurities with a molecular weight less than 3000 g / mol. And through HORIBA JOBIN YVON ULTIMA II inductively coupled plasma-atomic emission spectrometer (ICP-AES) and standard SW846 EPA (Environmental Protection Agency) method 6010 procedure for titanium content analysis, the results show that the final precursor solution has a titanium content of 496 mM.

Embodiment 2

[0073] The preparation process of the precursor solution of the composite fiber with niobium carbide embedded in CNT is as follows: NbCl 5 (purity>99%), NH 4 OH and 20% HF are dissolved in pure water treated by Milli-Q water treatment system. The resulting solution was subjected to ultrafiltration using an Amicon ultrafiltration system under 60 psi argon pressure to remove impurities with a molecular weight less than 3000 g / mol. The details are as follows: by adding ammonia water dropwise, 2g NbCl 5 Convert to Nb(OH) 5 Afterwards, dissolve in 30 mL of deionized water, and then add 7.5 mL of 20% HF. Add 31 parts (3.0 g in total) of PEI one by one, and mix and stir. The solution was placed in an Amicon ultrafiltration system with an ultrafiltration membrane for filtration to remove impurities with a molecular weight less than 3000 g / mol. Then the solution was diluted 3 times to 200mL, and then subjected to ultrafiltration to obtain a concentrated solution of 35mL. The ICP ...

Embodiment 3

[0075] The preparation process of the precursor solution of the composite fiber with tantalum carbide embedded in CNT is as follows: dissolve tantalum chloride in water, and then add ammonia water to produce tantalum hydroxide (Ta(OH) 5 )precipitation. Wash with plenty of deionized water to remove chloride ions in the precipitate. The precipitate was then dissolved in 20% HF to form a tantalum fluoride complex. PEI was added, and the resulting solution was filtered using an Amicon ultrafiltration system under 60 psi argon pressure to remove impurities with a molecular weight less than 3000 g / mol. ICP results indicated that the final precursor solution had a tantalum content of 214 mM.

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Abstract

The invention discloses a preparation method of a carbon nano-tube composite material with enhancing characteristics. The composite materials of carbon nano-tubes (CNTs) and a metal carbide include spiral carbon nano-tubes/metal carbide composite fiber and film. According to the composite fiber, carbon nano-tubes are drawn or twisted from a carbon nano-tube array, such that spinning fiber is formed; the spinning fiber is immersed into a metal precursor solution; and the mixture is heated in a reductive gas comprising carbon-source gas, such that the composite material is prepared. Compared with direct-spinning fiber, the carbon nano-tube composite material with enhancing characteristics has the advantages that: the composite has higher tensile strength, conductivity, and tensile modulus; 2, a parallel tape composite structure comprising carbon nano-tube array embedded in an NbC film shows enhanced conductivity and improved superconductivity along a CNT axial direction; 3, enhanced upper critical magnetic field of a NbC/CNT composite film shows that the NbC coherence length is reduced with the CNTs content in the NbC array; and 4, a nano-mechanical test also proofs the potential application of the material in enhancing the fracture toughness of the NbC/CNT composite film.

Description

technical field [0001] The invention relates to a method for preparing carbon nanotube composite materials with enhanced properties. Background technique [0002] Carbon nanotubes (CNTs) possess high mechanical strength, high hardness, and excellent electrical conductivity, but these properties are usually not fully exploited due to their too short growth length. Long fibers are assembled from very short carbon nanotubes, but these fibers have only low mechanical strength and electrical conductivity. Efforts to improve these properties have involved the preparation of composites containing carbon nanotube fibers of various materials, including the use of polymers, silicon or gold. However, the mechanical strength and electrical conductivity of these composite materials reported in the literature are still relatively low. Therefore, composites of CNTs with enhanced properties are still highly desired. Contents of the invention [0003] 1. Purpose of the present invention...

Claims

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Application Information

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IPC IPC(8): C01B31/02B82Y30/00C01B32/168
Inventor 邹贵付赵杰
Owner 常熟苏大低碳应用技术研究院有限公司
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