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A method of alkaline treatment of carbon nanotubes to improve their aqueous solution dispersibility

A carbon nanotube and aqueous solution technology, applied in the direction of nanotechnology, nanotechnology, chemical instruments and methods, etc., can solve the problems of changing the shape of carbon nanotubes, difficult collection of carbon nanotubes, and low quality of carbon nanotubes, etc., to achieve equipment The effect of simplicity, high production efficiency and convenient operation

Active Publication Date: 2017-08-29
SHANDONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For oxidation modification, the mixed acid solution of concentrated sulfuric acid and concentrated nitric acid with a volume ratio of 3:1 is commonly used to oxidize carbon nanotubes, but this process will cut off the length of carbon nanotubes, change the shape of carbon nanotubes, and the raw materials It is highly corrosive and has certain risks. At the same time, the cut carbon nanotubes are not easy to collect, and the final modified carbon nanotubes have less quality and low yield, which directly affects the application of carbon nanotubes.

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  • A method of alkaline treatment of carbon nanotubes to improve their aqueous solution dispersibility
  • A method of alkaline treatment of carbon nanotubes to improve their aqueous solution dispersibility
  • A method of alkaline treatment of carbon nanotubes to improve their aqueous solution dispersibility

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no. 1 example

[0039] h 2 o 2 The aqueous solution can be commercially available product (such as content is 30wt%), or by using peroxide (calcium peroxide (CaO 2 ) or sodium peroxide (Na 2 o 2 )) obtained by reacting with water. The embodiment of the present invention is not limited to obtaining H 2 o 2 Aqueous solution method.

[0040] Appropriate choice of H 2 o 2 Addition ratio of aqueous solution. When H 2 o 2 When the addition ratio of the aqueous solution is too low, the H 2 o 2 Decomposition produces the amount and the speed of hydroxyl radicals are very small, then the speed of the processing method according to the embodiment of the invention is also slow; when H 2 o 2 When the addition ratio of the aqueous solution is too large, the H 2 o 2 The amount and speed of hydroxyl radicals produced by decomposition will be so large that a large amount of processed carbon nanotubes will be consumed in a short period of time. Therefore, it is necessary to choose H appropria...

Embodiment 1

[0048] Mix 0.1 g multi-walled nanotubes with 0.1 g KMO 4 , 100ml NaClO was mixed evenly in a 500ml three-hole flask. Then the reaction temperature was raised to 75°C and kept for 3h. After cooling to room temperature, the obtained product was added with 200ml of H 2 o 2 for secondary oxidation. The product after the secondary oxidation was acid-treated with 100ml of concentrated hydrochloric acid, filtered and washed, and finally CNTs containing certain hydroxyl functional groups were obtained.

Embodiment 2

[0050] Mix 0.1 g multi-walled nanotubes with 0.1 g KMO 4 , 100ml NaClO was mixed evenly in a 500ml three-hole flask. Then the reaction temperature was raised to 85°C and kept for 3h. After cooling to room temperature, the obtained product was added with 200ml of H 2 o 2 for secondary oxidation. The product after the secondary oxidation was acid-treated with 100ml of concentrated hydrochloric acid, filtered and washed, and finally CNTs containing certain hydroxyl functional groups were obtained.

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Abstract

The invention provides a method for improving the dispersibility of a carbon nano tube in an aqueous solution by performing alkalization treatment on the carbon nano tube. According to the method for improving the dispersibility of the carbon nano tube in the aqueous solution, sodium hypochlorite and potassium permanganate serve as strong oxidants, and the carbon nano tube, the sodium hypochlorite and the potassium permanganate are heated and stirred to react in a digital magnetic stirring and heating sleeve; after heating is performed for a certain time, a certain amount of hydrogen peroxide is added to react with the sodium hypochlorite, the potassium permanganate and potassium manganate to generate oxygen, and secondary oxidation is performed on the carbon nano tube; the carbon nano tube obtained through reacting is processed through concentrated hydrochloric acid pickling to remove impurities, suction filtering and drying to obtain the oxidized carbon nano tube which has the good dispersing performance in the aqueous solution. The method has the advantages of being low in reacting temperature, high in safety, easy to operate, high in yield and capable of easily achieving large-scale preparation.

Description

technical field [0001] The invention belongs to the technical field of preparation methods of inorganic non-metallic materials, and in particular relates to a method for alkaline treatment of carbon nanotubes to improve their aqueous solution dispersibility. Background technique [0002] Since carbon nanotubes were reported by Iijima in 1991, they have attracted widespread attention from scholars at home and abroad for their excellent chemical properties, mechanical properties, thermal properties, electrical properties, field emission properties, optical properties, magnetic properties, and dielectric properties. interest. According to different structures, carbon nanotubes can be divided into single-walled carbon nanotubes (SWNTs) and multi-walled carbon nanotubes (MWNTS). Among them, SWNTs are expensive and are generally used in fields such as field emission flat panel displays and sensors, while MWNTS is relatively expensive. It is relatively low, and has been produced a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/168B82Y30/00
Inventor 毕见强赵庆强王伟礼裴碧泓毕振宇孙国勋
Owner SHANDONG UNIV