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Preparation of Dispersed Powder of Amphoteric Carbon Nanotubes

A carbon nanotube and single-walled carbon nanotube technology, which is applied in the fields of nanostructure manufacturing, nanotechnology, nanotechnology, etc., can solve the problems of inconvenient storage and transportation of dispersion liquid, easy agglomeration and hardness of powder, and troublesome redispersion. , to achieve the effect of fast dispersing speed, large dispersing degree and improving dispersing performance

Inactive Publication Date: 2011-12-14
南京宏德纳米材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Hasan (see Tawfique Hasan et al., J.Phys.Chem.C 2007, 111, 12594-12602) etc. used PVP as a dispersant to prepare single-walled carbon nanotubes (SWNTs) in N-methylpyrrolidone (NMP) The dispersion in NMP, this dispersion can only be stable for 3 weeks; Although, the stable time of the dispersion of SWNTs in NMP is increased to 30 days (see Pub.No.: US 200700224106A1), but the content of carbon nanotubes in the dispersion Too little, less than 0.01wt%, and the storage and transportation of the dispersion are inconvenient; Qiu (see Jun Qiu et al., J Nanopart Res, 2008, 10, 659-663) utilizes vinylpyrrolidone (NVP) and azodiiso Butyronitrile (AIBN) was ultrasonically stirred in ethanol to prepare amphoteric NVP-MWNTs powder. The solubility of the NVP-MWNTs powder in water, ethanol and DMF were 0.4mg / ml, 0.33mg / ml, and 0.34mg / ml, respectively. Calculated by weight percentage, they are 0.040%, 0.042%, and 0.036%, respectively. Since the drying method used is the ordinary vacuum drying method, the obtained powder is easy to agglomerate and has high hardness. It is troublesome to redisperse and requires high ultrasonic Frequency and longer ultrasonic and stirring time

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031]Dissolve 0.2g polyvinylpyrrolidone (average molecular weight: 360,000) in 100ml deionized water at room temperature, then add 0.1g OP-10 to fully dissolve and mix, add 0.1g carbon nanotubes to the solution, sonicate for 2 hours, and then Stir in a water bath at ℃ for 12 hours to obtain a black carbon nanotube dispersion; centrifuge the obtained black liquid for 5 minutes, and take the stable carbon nanotube dispersion in the upper layer; then freeze and thaw the above dispersion in liquid nitrogen repeatedly for 3-4 times, Then put the frozen sample into a freeze dryer, rapidly cool to -40°C, and at the same time vacuumize the drying chamber until the air pressure is less than 10pa, dry for 12 hours, take out the sample, and obtain dispersed and fluffy carbon nanotube powder.

Embodiment 2

[0033] Dissolve 0.2g polyvinylpyrrolidone (average molecular weight 360000) in 100ml deionized water at room temperature, then add 0.1g Tween-20 (Tween-20) to fully dissolve and mix, add 0.1g carbon nanotubes to the solution, and ultrasonically After 2 hours, stir in a water bath at 50°C for 12 hours to obtain a black carbon nanotube dispersion; centrifuge the obtained black liquid for 5 minutes, and take the stable carbon nanotube dispersion in the upper layer; then freeze the above dispersion in liquid nitrogen repeatedly Thaw 3-4 times, then put the frozen sample into a freeze dryer, cool it to -40°C, and evacuate it until the air pressure in the drying room is less than 10pa, dry it for 12 hours, take out the sample, and get dispersed and fluffy carbon nanotube powder .

Embodiment 3

[0035] Dissolve 0.2 g of polyvinylpyrrolidone (average molecular weight 720,000) in 100 ml of deionized water at room temperature, add 0.1 g of carbon nanotubes into the solution, ultrasonicate for 2 hours, and then stir in a water bath at 50°C for 12 hours to obtain black carbon Nanotube dispersion; centrifuge the obtained black liquid for 5 minutes, and take the stable carbon nanotube dispersion in the upper layer; then freeze and thaw the above dispersion in liquid nitrogen for 3-4 times, and then put the frozen sample into a freeze dryer , rapidly cooled to -40°C, and simultaneously evacuated until the air pressure in the drying chamber was less than 10 Pa, dried for 12 hours, and the sample was taken out to obtain dispersed and fluffy carbon nanotube powder.

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PUM

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Abstract

The carbon nanotube powder prepared by the invention has hydrophilic and lipophilic properties and can be dispersed in water and organic solvents. First, surface active agent is used to disperse carbon nanotubes in water to form a uniform and stable dispersion liquid; then, the carbon nanotube dispersion liquid is freeze-dried to obtain dispersed and fluffy carbon nanotube powders. The operation method of the present invention is simple and practical, and is easy to operate. The carbon nanotube powder prepared by the present invention can be well dispersed in water and organic solvents (such as NMP, DMF, ethanol, etc.) under stirring, ultrasonic action or a combination thereof, Large dispersion, fast dispersion speed and uniform dispersion system significantly improve the dispersion performance of carbon nanotubes, which creates conditions for the real application of carbon nanotubes in composite materials, electrode materials, nano devices and other fields.

Description

technical field [0001] The invention relates to a method for preparing amphoteric carbon nanotube powder. The prepared carbon nanotube powder has hydrophilic and lipophilic properties, can be well dispersed in water and organic solvents, and has a wide range of applications in composite materials, electrode materials, nano devices, etc. application. It belongs to the field of decentralized technology. Background technique [0002] Carbon nanotubes (CNTs) have been favored by researchers in the fields of chemistry, physics and materials science since their discovery in 1991. Due to its extremely high aspect ratio and super mechanical properties, it has become a one-dimensional nanomaterial with great application potential. Its application has involved nanoelectronic devices, batteries, supercapacitors, field emission displays, sensors, catalyst supports, electrical Chemical materials, hydrogen storage materials and composite material enhancements are many aspects. The supe...

Claims

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Application Information

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IPC IPC(8): C01B31/02B82B3/00
Inventor 沈同德李静
Owner 南京宏德纳米材料有限公司
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