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Method for preparing aluminum oxide nanofiber by electrostatic spinning

A nano- and electrospinning technology of alumina, which is applied in fiber processing, textile and papermaking, filament/wire forming, etc., can solve problems such as inability to guarantee the fiber formation and strength of alumina, poor experimental repeatability, and low aluminum content , to achieve the effects of enhanced strength, enhanced repeatability, and increased content

Inactive Publication Date: 2011-03-02
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

The precursor used in this experiment is a good precursor of alumina due to its moderate hydrolysis rate, but it is very important that the solubility of aluminum acetylacetonate in acetone is very small, so the aluminum content in the mixed primary fiber will If it is too low, the fiber formation and strength of alumina cannot be guaranteed, and the repeatability of the experiment will be poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Weigh 0.83g of aluminum acetylacetonate, dissolve it in 15g of DMF, stir well to dissolve it completely; then weigh 1.67g of PAN, dissolve it in the above solution, and heat and stir at 50°C to make the whole system reach Uniform and transparent.

[0023] Then the obtained precursor solution was electrospun: the temperature was 20° C., the humidity was 50%, the output voltage was set to 18 KV, the propulsion speed of the propulsion pump was 30 μL / min, and the receiving distance was 12 cm. The resulting spun fibers were exposed to air for 24 hours to fully gel them.

[0024] Finally, the as-spun fibers obtained above were sintered under suitable conditions: the sintering atmosphere was air, the heating rate was 5°C / min, and the calcination temperature was 1400°C; ℃ for 1 hour, then cool down naturally.

[0025] After sintering, the alumina fiber maintains the fiber structure, and the diameter is greatly reduced. SEM results show that the continuity of the alumina fiber...

Embodiment 2

[0027] Weigh 1.67g of aluminum acetylacetonate, dissolve it in 15g of DMAc, stir well to dissolve it completely; then weigh 1.67g of PAN, dissolve it in the above solution, and heat and stir at 50°C to make the whole system reach Uniform and transparent.

[0028] Then the obtained precursor solution was subjected to electrospinning: the temperature was 25°C, the humidity was 42%, the output voltage was set to 18KV, the propulsion speed of the propulsion pump was 30 μL / min, and the receiving distance was 12cm. The resulting spun fibers were exposed to air for 24 hours to fully gel them.

[0029] Finally, the as-spun fibers obtained above were sintered under suitable conditions: the sintering atmosphere was air, the heating rate was 5°C / min, and the calcination temperature was 1400°C; ℃ for 1 hour, then cool down naturally.

[0030] After sintering, the alumina fiber still maintains the fiber structure well, and the diameter is greatly reduced. SEM results show that the contin...

Embodiment 3

[0032] Weigh 0.83g of aluminum acetylacetonate, dissolve it in 15g of DMF, stir well to dissolve it completely; then weigh 1.67g of PU, dissolve it in the above solution, and heat and stir at 70°C to make the whole system reach Uniform and transparent.

[0033] Then the obtained precursor solution was electrospun: the temperature was 27° C., the humidity was 56%, the output voltage was set to 18 KV, the propulsion speed of the propulsion pump was 20 μL / min, and the receiving distance was 15 cm. The resulting spun fibers were exposed to air for 24 hours to fully gel them.

[0034] Finally, the as-spun fibers obtained above were sintered under suitable conditions: the sintering atmosphere was air, the heating rate was 5°C / min, and the calcination temperature was 1300°C; ℃ for 1 hour, then cool down naturally.

[0035] After sintering, the alumina fiber still maintains the fiber structure well, and the diameter is greatly reduced. SEM results show that the continuity of the alu...

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Abstract

The invention relates to a method for preparing an aluminum oxide nanofiber by electrostatic spinning, comprising the following steps: (1) dissolving a polymer in a solvent to obtain a polymer solution and then pouring the polymer solution into an aluminum acetylacetonate solution to obtain a precursor solution; (2) carrying out spinning on the precursor solution; and (3) exposing as-spun fibre to the air, then sintering the exposed as-spun fibre, and naturally cooling the as-spun fibre to obtain the aluminum oxide nanofiber. With the precursor solution, the smooth electrostatic spinning can be ensured, the content of aluminum in the system can be improved and the strength of the alumina fibre can be enhanced.

Description

technical field [0001] The invention belongs to the field of preparation of alumina nanofibers, in particular to a method for preparing alumina nanofibers by electrospinning. Background technique [0002] Electrospinning is a simple and convenient new method to produce nano-alumina fibers. The most critical part of this method is the preparation of the precursor solution, and the preparation process uses the sol-gel method, that is, the specific production process is as follows: first, the alumina precursor, the polymer and a suitable solvent are respectively selected to make A homogeneous mixed solution; then, form a sol-gel system through hydrolysis and gelation of the alumina precursor; then, spin under appropriate electrospinning conditions to obtain nascent fibers; finally, after proper sintering Treat the as-spun fibers under certain conditions to remove polymers and other impurities to obtain high-purity α-phase alumina fibers. [0003] At present, there are not man...

Claims

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Application Information

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IPC IPC(8): D01F9/08D01D5/00
Inventor 俞昊郭建朱美芳陈彦模朱树琦苏峰
Owner DONGHUA UNIV
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