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A method for automated continuous chromatographic separation of single-walled carbon nanotubes

A technology of single-walled carbon nanotubes and continuous chromatography, which is applied in the field of automatic continuous chromatography to separate single-walled carbon nanotubes, and can solve problems such as clogging of chromatographic columns and failure of chromatographic columns

Inactive Publication Date: 2017-04-26
NAT INST OF METROLOGY CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CNTs directly enter the chromatographic column without buffering and filtering, which will block the chromatographic column and make the chromatographic column invalid

Method used

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  • A method for automated continuous chromatographic separation of single-walled carbon nanotubes

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A: Configure 1wt% DOC solution as mobile phase.

[0035] B: Weigh 0.0021g of single-walled carbon nanotubes and add them to 10mL of 1wt% DOC aqueous solution for ultrasonic dispersion for 10 hours and high-speed centrifugation for 15 minutes. The supernatant liquid is taken to obtain single-walled carbon nanotube mother liquor.

[0036] C: Gel Chromatographic Separation

[0037] The height of the chromatographic column is 9 cm, the thickness of the soft filter is 2 cm, and the pore size is 800 μm. The agarose gel is used as the chromatographic column filler, and the pore size of the filler is 60 μm.

[0038] Draw 1mL of the single-walled carbon nanotube solution obtained in B, inject it into the packed chromatographic column, use 1wt% DOC as the mobile phase, and pump the flow rate of 0.2mL / min, collect samples every 2min, collect for 1 hour, and obtain the separation single-walled carbon nanotubes.

Embodiment 2

[0040] A: Configure 1.5wt% SDS solution as mobile phase.

[0041] B: Weigh 0.0040g of single-walled carbon nanotubes and add them to 10mL of 1.5wt% SDS aqueous solution for ultrasonic dispersion for 10 hours and high-speed centrifugation for 15 minutes, and take the upper layer of centrifuged liquid to obtain single-walled carbon nanotube mother liquor.

[0042] C: Gel Chromatographic Separation

[0043] The height of the chromatographic column is 15cm, the thickness of the soft filter is 3cm, and the pore size is 1000μm. Sephadex is used as the chromatographic column filler, and the pore size of the filler is 120μm.

[0044] Draw 2mL of the single-walled carbon nanotube solution obtained in B, inject it into the packed chromatographic column, use 1.5wt% SDS as the mobile phase, pump the flow rate of 0.2mL / min, collect samples every 2min, and collect for 1 hour to obtain Isolated single-walled carbon nanotubes.

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Abstract

The invention relates to a method used for automatic continuous chromatographic separation of single-walled carbon nanotubes; according to the method, a uniquely designed chromatographic column is used, chromatographic column packing materials with different aperture sizes and heights are selected, different moving phases are used for separation of the metallic and semiconductive single-walled carbon nanotubes. The uniquely designed chromatographic column is designed as follows: a soft filter screen and a hard filter screen are additionally designed at two openings of a conventional chromatographic column respectively, so that single-walled carbon nanotubes of different concentrations can successfully pass through a sample inlet and a sample outlet without accumulation or blocking the openings of the chromatographic column when flowing in and flowing out, and the purpose of automatic continuous chromatographic separation of the single-walled carbon nanotubes can be achieved. The soft filter screen is manufactured by a polymer or carbon fiber material, and the hard filter screen is manufactured by a metal material with a certain aperture size; the aperture size of the soft filter screen is 100-1000 microns, and the aperture size of the hard filter screen is 50-800 microns; the thickness of the soft filter screen is 1-5 cm, and the thickness of the hard filter screen is 3-5 microns.

Description

[0001] Field [0002] The present invention relates to a method for automatic continuous chromatographic separation of single-walled carbon nanotubes, in particular to automatic and continuous single-walled carbon nanotubes separated from single-walled carbon nanotubes which are clearly identifiable, have a single structure and have stable electrical properties simple method. Background technique [0003] In 1991, Lijima discovered that carbon nanotubes were the next step in C 60 Another major discovery in the field of carbon chemistry since its discovery. Carbon nanotubes (carbon nanotubes referred to as CNTs) can be regarded as seamless, hollow tubes formed by curling graphene sheets composed of six-membered rings. This unique structural feature makes it have special electrical properties and super mechanical properties, showing good application prospects in electronic devices, composite materials, hydrogen storage materials, chemical and biological sensors, etc. [0004]...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/159C01B32/16B82Y30/00B82Y40/00
Inventor 任玲玲孙国华高慧芳李适
Owner NAT INST OF METROLOGY CHINA