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Method for producing nanoparticles of aluminium spinels, and the use thereof

A technology of nano-particles and aluminum spinel, which is applied in the direction of nanotechnology, nanotechnology, nanotechnology, etc. for materials and surface science, and can solve the problems of unsuitable industrial scale preparation of aluminum spinel, low yield, etc. question

Inactive Publication Date: 2009-07-22
アークロマアイピーゲーエムベーハー
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The process according to the known prior art has the disadvantage that expensive starting compounds are used, or that the yield per unit time is low due to the work-up
Therefore, the known methods are not suitable for the economical preparation of aluminum spinel on an industrial scale

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0109] Zinc chloride was blended into a 50% aqueous solution of aluminum chloride hydrate so that the ratio of aluminum oxide to zinc oxide after calcination was 50:50. After homogenizing the solution by stirring, it is dried in a rotary evaporator. The solid aluminum chloride hydrate-zinc chloride mixture was crushed in a mortar, whereby a coarse powder was produced.

[0110] The powder was calcined at 850°C in a rotary furnace. The contact time in the hot zone is a maximum of 5 minutes. A white powder is obtained with a particle size distribution corresponding to the charge.

[0111] X-ray structural analysis revealed it to be zinc spinel. The residual chlorine content is less than 100ppm. High-resolution REM (scanning electron microscopy) images showed microcrystals <10 nm, which existed in agglomerated form.

[0112] In a further step 40 g of gahnite were suspended in 160 g of water. The suspension was deagglomerated in a vertical agitator ball mill from the company ...

Embodiment 2

[0114] Cobalt II chloride was blended into a 50% aqueous solution of aluminum chloride hydrate such that the ratio of alumina to cobalt oxide after calcination was 50:50. After homogenizing the solution by stirring, it is dried in a rotary evaporator. The solid aluminum chloride hydrate-cobalt II chloride mixture was comminuted in a mortar, whereby a coarse powder was produced.

[0115] The powder was calcined at 1000° C. in a rotary furnace. The contact time in the hot zone is a maximum of 5 minutes. A dark blue powder is obtained, the particle size distribution of which corresponds to that of the charge. X-ray structural analysis revealed the presence of a spinel lattice.

[0116] In a further step 40 g of cobalt spinel were suspended in 160 g of water. The suspension was deagglomerated in a vertical agitator ball mill from the company Netzsch (type PE075). The grinding beads used consisted of zirconia (stabilized with yttrium) and had a size of 0.3 mm. The pH-value of...

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PUM

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Abstract

The invention relates to a method for producing nanoparticles of aluminium spinels. According to said method, a salt of a metal, the oxide of which can form a spinel lattice with aluminium oxide, is added to an aqueous solution of aluminium chlorohydrate, the solution is then dried, and calcinated in less than 30 minutes, and the agglomerated material thus obtained is ground.

Description

technical field [0001] The invention relates to the preparation and application of nanoparticles composed of aluminum spinel. Background technique [0002] Aluminum spinels occur naturally as minerals, the production of which in nanocrystalline form and their use for many fields of application have already been described. Among the most familiar representatives are zinc spinels, ZnAl 2 o 4 , known as Gahnit (zinc spinel), and magnesium spinel MgAl 2 o 4 . Aluminum spinel is used as a raw material (S.K.Sampath, J.F.Cordano, JAm.Ceram.Soc.81,649 (1998)) of ceramics, as an oxidation reaction catalyst (T.Ohgushi, S.Umeno, Bull.Chem.Soc. Jpn.60 (1987) 4457), and used as a pigment (E. DeBie, P. Doyen, Cobalt 15 (1962) 3). Furthermore, zinc spinels have a band gap and thus exhibit interesting optical properties, which make the material suitable for electroluminescent applications (Hiroaki Matsui, Chao-Nan Xu, Yun Liu, Hiroshi Tateyama, Physical Review B 69 , 235109 (2004), a...

Claims

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Application Information

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IPC IPC(8): C01F7/02C01G9/00
CPCC01P2004/64B82Y30/00C01P2002/32C01G45/00C01G9/00B01J23/005C01G53/00B01J23/06C01P2004/51C01F7/02C01G3/00C01G49/0045C01P2004/50B01J23/72C01G51/00C09C1/0009C01P2006/60
Inventor N·勒施
Owner アークロマアイピーゲーエムベーハー
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