Low-density SiC nanofibers and preparation method thereof

A nanofiber, low-density technology, applied in the field of high-performance inorganic functional material preparation, can solve the problems of high requirements on equipment, high vacuum degree, and complicated equipment, and achieves low equipment requirements, uniform distribution, and easy operation. Effect

Inactive Publication Date: 2015-03-25
FUZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The CVD method is a commonly used method in the preparation of thin film materials, but this method has high requirements on the vacuum degree in the system, complicated instruments, and difficult oper

Method used

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  • Low-density SiC nanofibers and preparation method thereof

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Example Embodiment

[0028] Example 1

[0029] Take 2.8 g of polyacrylonitrile (PAN, molecular weight 22600) into 16 ml of N,N-dimethylformamide (DMF), stir well to prepare solution A; add 1.5 ml of ethyl orthosilicate (TEOS) In 6 ml of DMF, slowly add 0.2 ml of glacial acetic acid dropwise to the mixed solution and mix thoroughly to prepare solution B; slowly add solution B to solution A and mix well to obtain a clear and transparent solution; after aging for 1 hour, start spinning. The electrospinning conditions are as follows: adjust the distance between the needle tip of the syringe and the receiving plate to 12 cm, the high-voltage DC power supply voltage is set to 20 kV, and the propulsion speed of the micro syringe pump is set to 0.8 ml / h; after spinning, take Lower the precursor sample on the receiving plate. The precursor was placed in a tube furnace and calcined at 1390°C in an argon atmosphere for 6 hours at a heating rate of 5°C / min; then baked at 650°C in an oxygen atmosphere for 4 hou...

Example Embodiment

[0030] Example 2

[0031] Take 1.4 g of polyacrylonitrile (PAN, molecular weight 22,600) into 10 ml of N,N-dimethylformamide (DMF), stir well to prepare solution A; add another 3 ml of ethyl orthosilicate (TEOS) In 10 ml of DMF, slowly add 0.4 ml of glacial acetic acid dropwise to the mixed solution and mix thoroughly to prepare solution B; slowly add solution B to solution A and mix well to obtain a clear and transparent solution; after aging for 1 hour, start spinning. The electrospinning conditions are as follows: adjust the distance between the needle tip of the syringe and the receiving plate to 12 cm, the high-voltage direct current power supply voltage is set to 20 kV, the advancement speed of the micro syringe pump is set to 1 ml / h; after spinning, take the Lower the precursor sample on the receiving plate. Place the precursor in a tube furnace, calcine at 1300℃ for 15 hours in an argon atmosphere, at a heating rate of 5℃ / min; then calcine at 650℃ in an oxygen atmospher...

Example Embodiment

[0032] Example 3

[0033] Take 1.4 g of polyvinyl alcohol (PVA, molecular weight 90000) into 10 ml of absolute ethanol, stir well to prepare solution A; take another 1.5 ml of ethyl orthosilicate (TEOS) into 6 ml of absolute ethanol, slowly to Add 0.2 ml of glacial acetic acid dropwise to the mixed solution and stir well to prepare solution B; slowly add solution B to solution A, mix well to obtain a clear and transparent solution; after aging for 0.5 hours, start spinning. Electrospinning conditions are as follows: The distance between the needle tip of the syringe and the receiving plate is 12 cm, the high-voltage DC power supply voltage is set at about 22 kV, and the advancing speed of the micro syringe pump is set at 1.2 ml / h; after spinning, remove the precursor on the receiving plate 物sample. The precursor was placed in a tube furnace and fired at 1350°C under argon atmosphere for 5 hours at a heating rate of 5°C / min; then baked at 600°C in an oxygen atmosphere for 4 hours...

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Abstract

The invention discloses low-density SiC nanofibers and a preparation method thereof. The density of the SiC nanofibers is about 0.3-0.6g/cubic centimeter (the density of commercialized SiC is about 1.1-1.3g/cubic centimeter), the diameters of the fibers are 100-500 nanometers and the length-diameter is greater than 100. The SiC nanofibers are prepared by adopting an electrospinning technique combined with a high-temperature carbon thermal reduction method, and the obtained SiC nano fibers are uniformly distributed. The SiC nanofibers provided by the invention are simple and feasible in preparation method and low in raw material price, and the structure and the morphology of the fibers are easy to control, so that the preparation method is a synthetic technology which is relatively strong in comprehensiveness and suitable for industrial popularization.

Description

technical field [0001] The invention belongs to the field of preparation of high-performance inorganic functional materials, and in particular relates to a low-density SiC nanofiber and a preparation method thereof. Background technique [0002] One-dimensional nanomaterials have unique properties and broad application prospects, and have developed into an important branch of functional materials in recent years. At present, there are many methods for synthesizing one-dimensional nanomaterials, and the prepared shapes are too numerous to enumerate, such as nanofibers, nanowires, nanoribbons, nanotubes, etc. Among the wide variety of synthetic methods, electrospinning technology (a process based on electrostatic interaction) stands out as one of the focuses of people's research. One-dimensional nanofibers prepared by electrospinning are based on uniaxial stretching of a polymer solution or a viscoelastic jet of melt. This method is similar to the mechanical stretching techn...

Claims

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Application Information

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IPC IPC(8): D01F9/10C04B35/565C04B35/622
Inventor 龙金林汪颖王绪绪张子重林华香
Owner FUZHOU UNIVERSITY
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