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High-throughput composite filter membrane based on inner hole property of carbon nanotubes and preparation method

A carbon nanotube and high-throughput technology, applied in the field of materials, can solve the problems of inability to prepare filter membranes, difficulty in large-scale synthesis, and high cost, and achieve the effects of fast fluid transportation, excellent electrical conductivity, and reduced resistivity

Inactive Publication Date: 2018-09-21
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the carbon nanotube / polyaniline composite film of this application is used as a capacitor, and the filter membrane cannot be prepared according to the preparation method of this application
[0006] There is also research on the properties of the inner pores of carbon nanotubes in the prior art. It is by preparing a composite film of vertical arrays of carbon nanotubes. It synthesizes vertical carbon nanotube arrays by chemical vapor deposition (CVD), and then fills them with polymers. piece 1cm 2 The cost of the vertical carbon nanotube array is as high as 900 yuan, the cost is too high, and the size of the vertical carbon nanotube array can only be a few centimeters, it is difficult to synthesize in a large area

Method used

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  • High-throughput composite filter membrane based on inner hole property of carbon nanotubes and preparation method
  • High-throughput composite filter membrane based on inner hole property of carbon nanotubes and preparation method
  • High-throughput composite filter membrane based on inner hole property of carbon nanotubes and preparation method

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Embodiment 1

[0050] The preparation method of the carbon nanotube high flux composite filter membrane of the present embodiment comprises the following steps:

[0051] 1) Purification of carbon nanotubes: put 500mg of carbon nanotubes in a three-necked flask, add 250mL of concentrated hydrochloric acid, heat and stir in a constant temperature oil bath at 70°C for 12h, filter and wash with water until neutral, and dry at 80°C for later use; Among them, the carbon nanotubes have a length of 50 μm and an outer diameter of 10 nm.

[0052] 2) Preparation of polymer solution: Add 20 mL of azide dimethylacetamide and 0.6 g of polyethersulfone into a 100 mL beaker, and stir at 70° C. for 24 hours.

[0053] 3) Preparation of carbon nanotube-polymer dispersion: Take 3 mg of purified carbon nanotubes in step 1) and add them to the polymer solution in step 2) to prepare a carbon nanotube-polymer dispersion, ultrasonically disperse for 15 minutes, and ultrasonically 40 s , stop for 20s. In the disper...

Embodiment 2

[0064] The preparation method of the carbon nanotube high flux composite filter membrane of the present embodiment comprises the following steps:

[0065] 1) Purification of carbon nanotubes: put 500mg of carbon nanotubes in a three-necked flask, add 250mL of concentrated hydrochloric acid, heat and stir in a constant temperature oil bath at 60°C for 12h, filter and wash with water until neutral, and dry at 80°C for later use; Among them, the carbon nanotubes have a length of 100 μm and an outer diameter of 30 nm.

[0066] 2) Preparation of the polymer solution: Add 20 mL of nitrogen dimethylacetamide and 0.6 g of polyvinylidene fluoride into a 100 mL beaker, and stir at a constant temperature of 70° C. for 24 hours.

[0067] 3) Preparation of carbon nanotube-polymer dispersion: Take 4.8 mg of purified carbon nanotubes in step 1) and add them to the polymer solution in step 2) to prepare a carbon nanotube-polymer dispersion, ultrasonically disperse for 12 minutes, and 40s, st...

Embodiment 3

[0072] The preparation method of the carbon nanotube high flux composite filter membrane of the present embodiment comprises the following steps:

[0073] 1) Purification of carbon nanotubes: put 500 mg of carbon nanotubes in a three-necked flask, add 250 mL of concentrated hydrochloric acid, heat and stir in an oil bath at 80°C for 12 hours, filter and wash with water until neutral, and dry at 80°C for later use; Among them, the carbon nanotubes have a length of 80 μm and an outer diameter of 20 nm.

[0074]2) Preparation of polymer solution: Add 20 mL of azide dimethylacetamide and 0.6 g of polyethersulfone into a 100 mL beaker, and stir at 70° C. for 24 hours.

[0075] 3) Preparation of carbon nanotube-polymer dispersion: Take 2.4 mg of purified carbon nanotubes in step 1) and add them to the polymer solution in step 2) to prepare a carbon nanotube-polymer dispersion, ultrasonically disperse for 10 min, and 40s, stop for 20s. In the dispersion liquid, the carbon nanotube ...

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Abstract

The invention belongs to the field of materials and discloses a high-throughput composite filter membrane based on an inner hole property of carbon nanotubes and a preparation method. The filter membrane is composed of the carbon nanotubes and a polymer; the polymer is used as a membrane matrix and the carbon nanotubes are directionally arrayed in the membrane matrix; the filter membrane takes inner holes of the carbon nanotubes as fluid transportation channels; the preparation method of the high-throughput composite filter membrane based on the inner hole property of the carbon nanotubes is characterized by comprising the following steps: a) applying a vertical electric field to a dispersed carbon nanotube-polymer dispersion solution through upper and lower pole plates; combining heatingand drying to obtain a dried carbon nanotube composite membrane; b) carrying out plasma etching on the dried composite membrane, so as to obtain the high-throughput composite filter membrane based onthe inner hole property of the carbon nanotubes. The filter membrane utilizes the inner hole property of the carbon nanotubes, so that compared with a traditional nano filter membrane, a flow speed ismore rapid and the throughput is high; membrane pollution is not easy to cause and the electrical conductivity is excellent, so that the high-throughput composite filter membrane is easy to popularize.

Description

technical field [0001] The invention belongs to the field of materials, and relates to a high-throughput composite filter membrane based on the properties of carbon nanotube inner pores and a preparation method. Background technique [0002] Carbon nanotubes have attracted much attention for their excellent mechanical, heat transfer, electrical conductivity and mass transfer properties, especially the unique nano-environment of their inner pores: the inner wall is almost atomically smooth, making it a frictionless nanochannel. Both the molecular dynamics model simulation and the actual carbon nanotube array flow research have confirmed that when the fluid flows through the inner hole of the carbon nanotube, its flow rate is 3-4 orders of magnitude faster than that of other nanochannels under the same conditions. The high-speed flow characteristics of the inner pores of carbon nanotubes make them expected to become the next generation of new membrane materials. Therefore, com...

Claims

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Application Information

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IPC IPC(8): B01D71/68B01D69/12B01D69/02B01D67/00
CPCB01D67/0079B01D69/02B01D69/12B01D71/68B01D2323/35B01D2325/26B01D2325/02
Inventor 高冠道任志远潘丙才蒲良桃丁杰刘振威董上上喻安晴王炎锋
Owner NANJING UNIV
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