Method for mfg. alumina nanofibre

A technology of alumina nanometer and nanofiber, which is applied in the preparation of alkali metal aluminate/alumina/hydroxide, alumina/aluminum hydroxide, artificial filament of inorganic raw materials, etc.

Inactive Publication Date: 2003-03-12
西安华创纳米化合物技术研究发展有限责任公司
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  • Method for mfg. alumina nanofibre

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Embodiment 1

[0029] Prepare 5 mol / L NaAlO 2 Solution, under vigorous stirring, dropwise add 5 mol / L HA C solution to the above NaAlO 2 In the solution, a white precipitate was formed, and the pH of the mother liquor was 6-7. The precipitate was separated by centrifugation and washed thoroughly with deionized water to remove impurity ions. 40 wt% polyethylene oxide was mixed with the above washed precipitate and stirred to form a viscous mass. Transfer the obtained mixture into a pressure-proof airtight container. The container was kept in an oven at a temperature of 373K for 40h. Take out the thick matter, dry it in the air at 373K, and then burn the dry solid at 723K for 10h. The product obtained was a white powder. The sample was determined by XRD, and the phase was γ-Al 2 o 3 . TEM measurement showed that the average fiber length was 52 nm, and the average width was 3.5 nm. BET measurement specific surface area 370m 2 / g, average pore diameter 17nm, pore volume 1.6cm 3 / g. ...

Embodiment 2

[0031] Prepare 3 mol / L NaAlO 2 Solution, under vigorous stirring, dropwise add 7 mol / L HA C solution to the above NaAlO 2 In the solution, a white precipitate was formed, and the pH of the mother liquor was 6-7. The precipitate was separated by centrifugation and washed thoroughly with deionized water to remove impurity ions. 30 wt% polyethylene glycol was mixed with the above-mentioned washed precipitate and stirred to form a viscous substance. Transfer the obtained mixture into a pressure-proof airtight container. The container was kept in an oven at a temperature of 423K for 58h. Take out the thick material, dry it in the air at 373K, and then burn the dry solid at 773K for 20h. The product obtained was a white powder. The sample was determined by XRD, and the phase was γ-Al 2 o 3 . TEM analysis shows fiber average length 75nm, average width 3.3nm (see figure 1 ). BET determination specific surface 371m 2 / g, average pore diameter 18nm, pore volume 1.7cm 3 / g. ...

Embodiment 3

[0033] Prepare 0.2 mol / L AlCl by using aluminum chips and 0.6 mol / L hydrochloric acid 3 solution. Add 0.5 M NaOH solution dropwise to AlCl with stirring 3 In solution, Al(OH) is formed 3 White precipitate, control the pH value of the precipitation mother liquor to 6-7. The precipitate was separated by centrifugation and washed with deionized water until no chloride ions were present in the washings. 60 wt% polyvinyl alcohol was mixed with the above-mentioned washed precipitate and stirred to form a viscous substance. Transfer the obtained mixture into a pressure-proof airtight container. The container was kept in an oven at 473K for 24h. The thick material was taken out, dried in air at 373K, and then the dried solid was burned at 873K for 10h. The phase of the sample analyzed by XRD is γ-Al 2 o 3 . TEM analysis shows fiber average length 84nm, average width 3.4nm (see figure 1 ). BET determination specific surface 373m 2 / g, average pore diameter 18nm, pore volume...

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Abstract

A process for preparing nanofibres of aluminium oxide includes such steps as mixing surfactant with aluminium hydroxide, hydrothermal treaitng at 293-573 deg.K for 5-80 hr, and firing at 473-1573 deg.K for 1-40 hr. Its product has high specific surface area (more than 350 sq.m/g).

Description

[0001] 1. Field [0002] The present invention relates to the preparation of aluminum oxide nanofibers, especially the use of aluminum hydroxide and surfactants mixed in a sealed container and guided growth under given conditions, followed by drying, burning or separation and drying by surfactants and burning to obtain alumina nanofiber products. 2. Background technology [0003] Due to the surface effect and quantum size effect of nanomaterials, they show characteristics that conventional materials do not have in many aspects, so people attach great importance to them and develop rapidly in the world. Inorganic oxide nanofibers are one of the research hotspots of nanomaterials in recent years, and nanofibers such as alumina, titanium dioxide, and silica have been prepared successively. Some of their unique structures and special properties have been found in applied research, and will have broad application prospects. For example, alumina nanofibers are ideal structural rei...

Claims

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Application Information

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IPC IPC(8): C01F7/02C01F7/04D01F9/08
Inventor 朱怀勇高学平曲金秋潘桂玲郗英欣宋德瑛
Owner 西安华创纳米化合物技术研究发展有限责任公司
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