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Strong-hydrophobic porous carbon nanofiber and preparation method thereof

A nanofiber and porous carbon technology, applied in the field of porous carbon fibers, can solve the problems of low specific surface area and low carbonization yield of PAN fibers, and achieve the effects of low surface oxygen content, reduced surface oxygen content, and improved hydrophobicity

Active Publication Date: 2013-12-04
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the carbonization yield of PAN fiber is low, and its specific surface area is very low without activation, and there is almost no pore structure.

Method used

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  • Strong-hydrophobic porous carbon nanofiber and preparation method thereof
  • Strong-hydrophobic porous carbon nanofiber and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The preparation method of strong hydrophobicity porous carbon nanofiber utilizes electrospinning technology, comprises the following steps:

[0025] Step 1: Add thermosetting phenolic resin and polyvinyl butyral to n-propanol and N,N -in a mixed solvent of dimethylacetamide (N,N-dimethylacetamide accounts for 10wt%), and stir until completely dissolved;

[0026] Step 2, under the condition that the spinning voltage is 24kV, the feeding speed is 1mL / h, and the working distance is 22cm, the above solution is spun into nanofibers;

[0027] The third step is to heat the above fiber from room temperature to 180° C. for 1.5 hours, and then carbonize it under an argon atmosphere at 800° C. to obtain highly hydrophobic porous carbon nanofibers.

[0028] The microstructure of the obtained carbon nanofibers is as follows: figure 1 As shown, the diameter range is 310-520nm, and the specific surface area is 734m 2 / g, the micropore volume is 0.24cm 3 / g, and the water contact a...

Embodiment 2

[0030] The preparation method of strong hydrophobicity porous carbon nanofiber utilizes electrospinning technology, comprises the following steps:

[0031] Step 1, according to the mass ratio of thermosetting phenolic resin (commercially available, molecular weight 2300) and polyvinylpyrrolidone is 1:0.024, add thermosetting phenolic resin and polyvinylpyrrolidone to methanol and N,N-dimethylformaldehyde amide mixed solvent (N,N-dimethylformamide accounted for 40wt%), and stirred until completely dissolved;

[0032] Step 2, under the condition that the spinning voltage is 23kV, the feeding speed is 0.9mL / h, and the working distance is 25cm, the above solution is spun into nanofibers;

[0033] Step 3, the above-mentioned fiber is heated stepwise from room temperature to 180° C. for curing for 3 hours, and then carbonized at 950° C. under a nitrogen atmosphere to obtain highly hydrophobic porous carbon nanofibers.

[0034] Among them, in the process of stepwise heating method, ...

Embodiment 3

[0037] The preparation method of strong hydrophobicity porous carbon fiber, utilizes electrospinning technique, comprises the following steps:

[0038] Step 1, according to the mass ratio of thermosetting phenolic resin (commercially available, molecular weight 600) and polyvinyl alcohol is 1:0.020, add thermosetting phenolic resin and polyvinyl alcohol to ethanol and N,N-dimethylacetamide Mixed solvent (N,N-dimethylacetamide accounted for 30wt%), and stirred until completely dissolved;

[0039] Step 2, under the condition that the spinning voltage is 23kV, the feeding speed is 1mL / h, and the working distance is 24cm, the above solution is spun into nanofibers;

[0040] Step 3: Stepwise raising the temperature of the above fibers from room temperature to 180° C. for 2 hours to cure, and then carbonizing at 850° C. under a nitrogen atmosphere to obtain highly hydrophobic porous carbon nanofibers.

[0041] Among them, in the process of stepwise heating method, the heating rate ...

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Abstract

The invention relates to strong-hydrophobic porous carbon nanofiber and a preparation method thereof, and belongs to the technical field of porous carbon fiber. The preparation method comprises the following steps: adding thermosetting phenol resin and high molecular weight linear polymers into organic solvent with two proportions to be mixed until the thermosetting phenol resin and the high molecular weight linear polymers are fully dissolved, performing electrostatic spinning on the solution to form phenolic resin fiber, and carrying out curing and carbonizing to obtain the hydrophobic porous carbon nanofiber. The porous carbon nanofiber and the preparation method have the advantages as follows: the diameter, the pore structure and the hydrophobicity of the fiber can be adjusted and controlled through the change of the proportions of the solvent, the prepared carbon nanofiber has good flexibility, a developed pore structure and strong hydrophobicity, and is more conductive to practical application.

Description

technical field [0001] The invention belongs to the technical field of porous carbon fibers, and relates to a highly hydrophobic porous carbon nanofiber and a preparation method thereof. Background technique [0002] Porous carbon nanofibers prepared by electrospinning and subsequent heat treatment have attracted great attention in applications such as adsorption catalysis, bioengineering, and energy storage due to their high specific surface area, well-developed pore structure, and self-supporting structure. So far, the precursor used to prepare porous carbon nanofibers is mainly polyacrylonitrile (PAN). However, the carbonization yield of PAN fiber is low, and its specific surface area is very low without activation, and there is almost no pore structure. However, phenolic resin-based carbon fiber has a high carbon yield and a well-developed pore structure can be obtained only after carbonization, which has attracted more and more attention. At the same time, the phenoli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F9/24D01F9/21D01F9/22D01F6/94D01F1/10
Inventor 黄正宏白宇康飞宇
Owner TSINGHUA UNIV
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