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A method for increasing the concentration of monodisperse carbon nanotube dispersion

A technology of carbon nanotubes and dispersion liquid, which is applied in the direction of carbon nanotubes, multi-walled carbon nanotubes, nanocarbons, etc., can solve the problem of difficult dispersion and preparation of monodisperse carbon nanotube solutions, reduce the separation efficiency and output of carbon nanotubes, etc. problems, to achieve efficient preparation and energy saving effects

Active Publication Date: 2021-12-03
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the traditional ultrasonic dispersion method is difficult to disperse and prepare a high-concentration monodisperse carbon nanotube solution, which greatly reduces the separation efficiency and yield of carbon nanotubes, thus preventing the use of carbon nanotubes in electronics, optoelectronics, and biomedicine. applications in other fields

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  • A method for increasing the concentration of monodisperse carbon nanotube dispersion
  • A method for increasing the concentration of monodisperse carbon nanotube dispersion
  • A method for increasing the concentration of monodisperse carbon nanotube dispersion

Examples

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Embodiment 1

[0046] This embodiment is used to specifically illustrate the preparation method of a high-concentration carbon nanotube dispersion liquid with high dispersibility, wherein the specific steps are as follows Figure 8 shown in the flow chart.

[0047] 1) Weigh 200 mg of commercially available carbon nanotube powder (GNH series, Beijing North Guoneng Co., Ltd.) and 2 g of sodium dodecyl sulfate (SDS) powder, add them to 100 mL of water together, and use an ultrasonic breaker (Sonifire 450D, Branson ) at a power of 30W / cm 2 Ultrasonic dispersion of the above solution for 16 hours;

[0048] 2) Centrifuge to remove impurities such as metal catalyst particles, carbon nanotube bundles and amorphous carbon in the dispersion in step 1), set the centrifugal force to 210000g, and take 90wt% of the supernatant for 30 minutes;

[0049] 3) Ultrasonic dispersion is carried out on the upper dispersion liquid obtained in step 2), with a power of 30W / cm 2 , the above solution was dispersed i...

Embodiment 2

[0056] This example is used to specifically illustrate the dispersion conditions of the present invention for preparing a high-dispersion carbon nanotube dispersion liquid concentration.

[0057] 1) Weigh 6 mg of commercially available carbon nanotube powder (GNH series, Beijing North Guoneng Co., Ltd.), 0.004 g of sodium cholate and 0.012 g of sodium lauryl sulfate powder, add them to 4 mL of water together, and use an ultrasonic breaker ( Sonifire 450D, Branson) with a power of 2W / cm 2 Ultrasonic dispersion of the above solution for 120 minutes;

[0058] 2) Centrifuge to remove impurities such as metal catalyst particles, carbon nanotube bundles, and amorphous carbon in the dispersion in step 1), set the centrifugal force to 1,050,000 g for 2 minutes, remove the solid precipitation at the bottom, and take all the upper layer;

[0059] 3) Ultrasonic dispersion is carried out on the upper dispersion liquid obtained in step 2), power 2W / cm 2 , ultrasonically disperse the abov...

Embodiment 3

[0063] This example is used to specifically illustrate the end value of the concentration of the carbon nanotube dispersion liquid with high dispersibility and the corresponding dispersion conditions of the present invention.

[0064] 1) Weigh 400 mg of commercially available carbon nanotube powder (GNH series, Beijing North Guoneng Co., Ltd.) and 2 g of sodium lauryl sulfate powder, add them to 100 mL of water together, and use an ultrasonic breaker (Sonifire 450D, Branson) to 30W / cm 2 Ultrasonic dispersion of the above solution for 32 hours;

[0065] 2) Centrifuge to remove impurities such as metal catalyst particles, carbon nanotube bundles and amorphous carbon in the dispersion in step 1), set the centrifugal force to 210000g, and take 90wt% of the supernatant for 30 minutes;

[0066] 3) Ultrasonic dispersion is carried out on the upper dispersion liquid obtained in step 2), with a power of 30W / cm 2 , ultrasonically disperse the above solution for 3 hours;

[0067] 4) C...

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Abstract

The invention provides a method for increasing the concentration of monodispersed carbon nanotube dispersion liquid, said method comprising the following steps: 1) preparing the initial dispersion liquid of carbon nanotube material and surfactant solution; 2) obtaining step 1) centrifuge the initial dispersion of carbon nanotubes, and collect the upper dispersion; 3) disperse the upper dispersion obtained in step 2); 4) centrifuge the dispersion obtained in step 3), and take the upper dispersion to obtain the final product. The present invention removes impurity components and hard-to-disperse carbon nanotube aggregates in the dispersion liquid through dispersion-centrifugation-redispersion-re-centrifugation, and concentrates the energy output by the dispersion equipment on the dispersion of small carbon nanotube bundles, ensuring The full dispersion of carbon nanotubes saves total energy consumption and sample preparation time, and is especially suitable for the preparation of carbon nanotubes containing more impurities and high-concentration carbon nanotube dispersions.

Description

technical field [0001] The invention belongs to the field of preparation of nanometer materials. Specifically, the present invention relates to a method for increasing the concentration of a monodisperse carbon nanotube dispersion. Background technique [0002] Due to its unique one-dimensional tubular structure, carbon nanotubes have excellent electrical, mechanical, thermal properties and high chemical stability, and have broad application prospects in the fields of electronics, optoelectronic integrated circuits, optical communications, and biomedicine. However, the special properties of carbon nanotubes come from their structure, and small differences in structure will lead to huge differences in properties. For a long time, synthesized carbon nanotubes usually exist in the form of a mixture of various structures. Due to the diversity of structures, the properties of synthesized carbon nanotubes are unpredictable and difficult to be directly applied, which requires subs...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/174C01B32/159
CPCC01B2202/06C01B2202/28C01B32/159C01B32/174
Inventor 杨德华刘华平魏小均周维亚解思深
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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