Method for separating double-walled carbon nanotubes of different diameters by using centrifugal speed changing method

A technology of double-walled carbon nanotubes and rate method, applied in the fields of carbon nanotubes, nanocarbons, chemical instruments and methods, etc.

Inactive Publication Date: 2017-09-08
XINJIANG UNIVERSITY
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Problems solved by technology

[0003] In recent years, the technology of separating carbon nanotubes (CNTs) of different sizes through various methods has been continuously developed, and has become a research hotspot in the practical application of CNTs. However, under the modified conditions of dispersing aids such as polymers, using concentrated sulfuric acid ( H2SO4) to obtain DWCNTs of different sizes and their electrochemical properties are rarely reported. Therefore, separation after recombination has become one of the new means to improve the purity of DWCNTs.

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  • Method for separating double-walled carbon nanotubes of different diameters by using centrifugal speed changing method
  • Method for separating double-walled carbon nanotubes of different diameters by using centrifugal speed changing method
  • Method for separating double-walled carbon nanotubes of different diameters by using centrifugal speed changing method

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Embodiment Construction

[0016] The present invention will be described in detail below in conjunction with accompanying drawing:

[0017] Polymer Synthesis

[0018] Argon was introduced into the 100ml polymerization bottle, and 2-amino-4,6-diiodopyrimidine (0.4160 mmol, 144.31 mg), 2,7-bis(4,4,5,5-tetramethyl -1,3,2-dioxaborolin-2-yl)-9,9-dioctylfluorene (0.4160mmol, 267.31 mg), cesium carbonate Cs2CO3 (2.08 mmol, 676.0 mg), plus 20.8 mL DME and 10.4 ml of deionized water, and argon gas was introduced for 15 min under electromagnetic stirring, and the zero-valent palladium catalyst Pd (PPh3) 4 (0.0208 mmol , 23.9 mg) was added. Under the protection of argon, the reaction system was refluxed at 58-60 ° C for 48 h, the reactant was cooled to room temperature, the resultant was washed successively with methanol and distilled water, recrystallized 3 times with chloroform / methanol, washed with methanol, and then dried under vacuum at 50°C for 48 h to obtain 138 mg of light yellow powder with a yield of 6...

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Abstract

The size control of DWCNTs was achieved by combining different centrifugation speeds with the properties of polypyrimidine to disperse and release DWCNTs upon acid treatment. Specifically, polymer / DWCNTs composites of different sizes were first separated by separating them at various speeds. Then, these isolated composites were treated with H2SO4 (98%) and the DWCNTs were freed from the composites, while the polymers were recovered for reuse. We found that the purity of DWCNTs extracted by size control is higher than that of commercial DWCNTs. The facile synthetic process of the polymer, the low cost of H2SO4, and the low centrifugation speed make the size-controlled sorting process of DWCNTs easier for practical application and industrial scale.

Description

technical field [0001] The invention relates to a method for separating double-walled carbon nanotubes of different sizes by changing the centrifugal speed method, which is a method for separating the double-walled carbon nanotubes according to different sizes by modifying the double-walled carbon nanotubes with polymers and using centrifugation and other simple operations. Background technique [0002] Carbon nanotubes have good electrical properties and excellent properties unmatched by traditional fibers, such as low density, high tensile strength, high elastic modulus, excellent flexibility, good thermal stability and chemical stability. Double-walled carbon Nanotubes (DWCNTs), as a special structure of carbon nanotubes between single-walled carbon nanotubes and multi-walled carbon nanotubes, are the simplest and ideal model for studying the interlayer interaction of carbon nanotubes due to their potential applications. started to get a lot of attention. [0003] In rec...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/174C01B32/168
CPCC01B2202/04C01B2202/30C01P2002/82C01P2002/84C01P2002/88C01P2004/04
Inventor 希尔艾力·买买提依明麦麦提江·图尔荪萨拉麦提·拜科日约麦尔江·麦麦提
Owner XINJIANG UNIVERSITY
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