A kind of carbon nanotube/nanofiber conductive composite film and preparation method thereof

A nanofiber and carbon nanotube technology, which is applied in the field of carbon nanotube/nanofiber conductive composite membrane and its preparation, can solve the limitation of the permeability of carbon nanotube composite membrane, can not give full play to the advantages of carbon nanotube structure, and affect the separation membrane Performance and application issues, to achieve the effect of easy mass production and application, flexible and controllable method, excellent flexibility and mechanical strength

Active Publication Date: 2022-02-15
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are some problems in the existing separation membranes based on carbon nanotubes, which affect the performance and application of separation membranes.
For example: pure carbon nanotube films have the problems of high preparation cost, poor mechanical strength, and difficulty in application; carbon nanotubes in mixed-matrix carbon nanotube films are seriously covered by other film materials, covering up the advantages of carbon nanotube materials themselves ; The permeability of the carbon nanotube composite membrane is limited by the matrix of the support layer, and the structural advantages of carbon nanotubes as a one-dimensional nanomaterial cannot be exerted

Method used

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  • A kind of carbon nanotube/nanofiber conductive composite film and preparation method thereof
  • A kind of carbon nanotube/nanofiber conductive composite film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Embodiment 1: Preparation of carbon nanotube / PAN nanofiber composite flat film

[0033] The first step, electrospinning to prepare nanofiber substrates

[0034] Dissolve the high molecular polymer polyacrylonitrile (PAN) as the substrate in N,N dimethylformamide (DMF), prepare a spinning solution with a mass fraction of 15%, and adjust the voltage density to about 1kV / cm , the spinning distance is in the range of 10-20cm, and the spinning time is adjusted according to the concentration to be 10h, and the corresponding nanofiber substrate is obtained from the receiving device, and hot-pressed at 150°C to obtain a flat nanofiber support layer.

[0035] The second step is to prepare carbon nanotube functional layer by electrostatic spraying

[0036] Disperse carbon nanotubes with a diameter of 60-100nm after acidification with mixed acid in water to prepare a 5mg / mL dispersion, and then control the voltage density at about 1kV / cm, and spin the nanofiber substrate within t...

Embodiment 2

[0040] Embodiment 2: prepare carbon nanotube / PAN nanofiber composite hollow fiber membrane

[0041] The first step, electrospinning to prepare nanofiber substrates

[0042] Dissolve the high molecular polymer PAN as the substrate in DMF, prepare a spinning solution with a mass fraction of 15%, adjust the voltage density to about 1kV / cm, and the spinning distance is in the range of 10cm. The stainless steel filament collector is used as the The receiving device adjusts the spinning time to 6 hours according to the concentration, and obtains the corresponding nanofiber hollow fiber support layer from the receiving device.

[0043] The second step is to prepare carbon nanotube functional layer by electrostatic spraying

[0044] Disperse carbon nanotubes with a diameter of 60-100nm after acidification with mixed acid in water to prepare a dispersion of 5-10mg / mL, and then control the voltage density at about 1kV / cm, and spin the nanofibers within the range of 10-20cm. The substr...

Embodiment 3

[0048] Embodiment 3: prepare carbon nanotube / PVDF nanofiber composite flat film

[0049] The first step, electrospinning to prepare nanofiber substrates

[0050] Dissolve the high molecular polymer polyvinylidene fluoride (PVDF) as the substrate in a mixed solution of DMF and acetone (9:1 in volume ratio), prepare a spinning solution with a mass fraction of 18%, and control the voltage density About 1kV / cm, the spinning distance is in the range of 10cm, the spinning time is adjusted according to the concentration to 10h, hot pressing is carried out at 80°C, and the corresponding flat nanofiber membrane substrate is obtained from the receiving device.

[0051] The second step is to prepare carbon nanotube functional layer by electrostatic spraying

[0052] Disperse the 10-20nm diameter carbon nanotubes acidified by the mixed acid in water to prepare a dispersion liquid of 5-10mg / mL, and then control the voltage density at about 1kV / cm, and spin the nanofibers within the range ...

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Abstract

The invention belongs to the field of membrane technology and provides a carbon nanotube / nanofiber conductive composite membrane and a preparation method thereof. The one-dimensional nanofiber non-woven fabric prepared by the electrospinning process is used as the support layer, and the carbon nanotubes are cross-linked on the support layer as the separation layer to construct a conductive film with a mesh-like pore structure interwoven with one-dimensional nanomaterials. The membrane pore size of the composite membrane involved is controllable from microfiltration to ultrafiltration, and the membrane shape includes controllable flat membrane, hollow fiber membrane, and roll membrane. The main advantages and beneficial effects of the composite membrane involved are: simple preparation steps, good permeability and mechanical strength, good hydrophilicity and electrical conductivity, and easy large-scale production and application.

Description

technical field [0001] The invention relates to a carbon nanotube / nanofiber conductive composite film and a preparation method thereof, belonging to the field of film technology. Background technique [0002] As a high-efficiency, energy-saving, simple and convenient phase separation technology, membrane separation technology is widely used in advanced sewage treatment, household drinking water purification and resource recycling in the field of water treatment. However, the existing separation membranes have problems such as the contradictory relationship between water permeability and separation ability, serious membrane fouling, and single membrane function, which seriously restrict the further development and application of membrane separation technology. [0003] The study found that the separation membrane prepared based on carbon nanotubes presents a membrane structure in which one-dimensional nanomaterials are interwoven into a network and interconnected membrane cha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D69/12B01D67/00B01D71/02
CPCB01D69/12B01D67/0079B01D71/021
Inventor 全燮杜磊陈硕
Owner DALIAN UNIV OF TECH
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