Selective separation method of diameter of single-wall carbon nano tube

A single-walled carbon nanotube, selective technology, applied in the field of carbon nanotube separation, can solve problems such as incompleteness, single-walled carbon nanotube winding, and insufficient environmental protection, and achieve a strong practical effect

Inactive Publication Date: 2010-09-15
THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The method reported in this literature utilizes the interaction between polymers and single-walled carbon nanotubes, and polymers are not easy to handle during processing.
First of all, the polymer chain is long, so it is easy to entangle with SWNTs, and it is not thorough enough in the selective separation of SWNTs; in addition, this method selects SWNTs with a wider diameter range, so the diameter limited options
For other reports on the diameter separation of single-walled carbon nanotubes, they are all operated in the organic phase, so the implementation is not environmentally friendly.

Method used

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  • Selective separation method of diameter of single-wall carbon nano tube
  • Selective separation method of diameter of single-wall carbon nano tube
  • Selective separation method of diameter of single-wall carbon nano tube

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Embodiment 1

[0038] Triptycene derivative Trp-TEG is composed of dihydroxytriacene Trp(OH) 2 And the synthesis of unilaterally substituted tetraethylene glycol, in which dihydroxytriacene Trp(OH) 2 and unilaterally substituted tetraethylene glycol obtained by methods known in the art, such as Peng, X.-X.; Lu, H.-Y.; Han, T.; Chen C.-F; Synthesis of aNovel Triptycene- Based Molecular Tweezer and Its Complexation with Paraquat Derivatives. Org. Lett. 2007, 9(5), 895-898. Synthetic steps include: under nitrogen protection, 0.57g Trp(OH) 2 , 1.53g unilaterally substituted tetraethylene glycol and 0.69g potassium carbonate mixture were refluxed in acetonitrile for 24 hours. The reaction was cooled to room temperature, then filtered. The resulting solution was concentrated, and then separated by column chromatography, wherein dichloromethane and methanol were eluted at a volume ratio of 100:1 to finally obtain 1.01 g of a colorless oily product. Utilize BRUKER DMX 300 solid-liquid dual-purpo...

Embodiment 2

[0042] Triptycene derivative Trp-TEG is composed of dihydroxytriacene Trp(OH) 2 And the synthesis of unilaterally substituted tetraethylene glycol, in which dihydroxytriacene Trp(OH) 2 and unilaterally substituted tetraethylene glycol obtained by methods known in the art, such as Peng, X.-X.; Lu, H.-Y.; Han, T.; Chen C.-F; Synthesis of aNovel Triptycene- Based Molecular Tweezer and Its Complexation with Paraquat Derivatives. Org. Lett. 2007, 9(5), 895-898. Synthetic steps include: under nitrogen protection, 0.57g Trp(OH) 2 , 1.53g unilaterally substituted tetraethylene glycol and 0.69g potassium carbonate mixture were refluxed in acetonitrile for 24 hours. The reaction was cooled to room temperature, then filtered. The resulting solution was concentrated, and then separated by column chromatography, wherein the elution was dichloromethane and methanol, and their volume ratio was 100:1, and 1.01 g of colorless oily product Trp-TEG was finally obtained. Utilize BRUKER DMX 30...

Embodiment 3

[0046] Triptycene derivative Trp-Ad is composed of dihydroxytriacene Trp(OH) 2 And the synthesis of unilaterally substituted adamantane ethanol, in which dihydroxytriacene Trp(OH) 2 and unilaterally substituted tetraethylene glycol obtained by methods known in the art, such as Peng, X.-X.; Lu, H.-Y.; Han, T.; Chen C.-F; Synthesis of aNovel Triptycene- Based Molecular Tweezer and Its Complexation with Paraquat Derivatives. Org. Lett. 2007, 9(5), 895-898. Synthetic steps include: under nitrogen protection, 0.57g Trp(OH) 2 , a mixture of 1.74g unilaterally substituted adamantane ethanol and 0.69g anhydrous potassium carbonate was refluxed in acetonitrile for 24 hours. The reaction was cooled to room temperature, then filtered. The resulting solution was concentrated, and then separated by column chromatography, wherein the eluent was dichloromethane and methanol in a volume ratio of 30:1, and finally 0.94 g of a colorless oily product was obtained. Utilize BRUKER DMX 300 soli...

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Abstract

The invention provides a selective separation method of the diameter of a single-wall carbon nano tube. The method comprises the following steps of: pretreating single-wall carbon nano tubes; dissolving the treated single-wall carbon nano tubes and a triptycene derivative into an alkaline solution to form a compound aqueous solution; dispersing by using ultrasound, centrifuging and then obtaining a supernatant; and filtering the obtained supernatant through a PDVF (Polyvinylidene Fluoride) filter membrane and drying to obtain solid thin-wall carbon nano tubes with a diameter range of 0.88-1.17nm. The ratio of the single-wall carbon nano tubes to the triptycene derivative is 1:(4-7), and preferentially, the triptycene derivative is Trp-TEG (Triethylene Glycol) or Trp-Ad. The method is environmentally friendly, simple and easy to operate and achieves the purposes that the diameter distribution of selective separation is narrower, and the single-wall carbon nano tubes with the diameters of about 1.0nm are obtained.

Description

technical field [0001] The invention relates to a method for separating carbon nanotubes. Specifically, the present invention relates to a method for selectively modifying single-walled carbon nanotubes with small organic molecules to separate them. Background technique [0002] Single-walled carbon nanotubes are seamless columnar structures formed by curling only one graphite layer. They have unique electronic and mechanical properties and have potential application prospects in the fields of nanodevices and nanocomposites. At present, the relatively mature preparation methods of single-walled carbon nanotubes (abbreviated as SWCNTs) include: 1) laser evaporation (Guo T, Nikolaev P, Thess A, et al.Catalytic growth of single-walled manotubes by laser vaporization.Chem Phys Lett.1995 , 243(1-2), 49-56). 2) Arc catalytic method (Ajayan P M, Lambert J M, Bernier P, et al. Growth morphologies during cobalt-catalyzed single-shell carbon nanotube synthesis. Chem Phys Lett. 1993,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02
Inventor 祖胜臻孙绪霞韩宝航
Owner THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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