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Studies on the Preparation of Aluminium Oxide (Hydrous)Ultrafine Particles by the Method of Microemulsion Reaction

CHEN Long-Wu; GAN Li-Hua; YUE Tian-Yi(Department of Chemistry,Tongji University,Shanghai,200092)ZHOU En-Xuan(The Ninth Department,Beijing University of Aeronauties,Beijing)  
The phase composition and properties of microemulsion system of water, Triton X-100,n-hexanol and cyclohexane, were studied.It shows that when n-hexanol and Triton X-100 is in the weight ratio of 2∶3, this microemulsion system has extensive and stable microemulsion phase regions, and therefore is an ideal reaction system for the preparation of ultrafine particles. In the water-in-oil microemulsion system of Triton X-100,n-hexanol, cyclohexane and aluminium hydroxide sol, aluminum hydrous oxide(α-AlOOH) ultrafine particles were prepared by the method of precipitation with NH_3 being used. According to transmission electron micrographs the mean diameter of particles is about 6 nm. The uniformity of particles is better. The particles size did not change when α-AlOOH ultrafine particles were converted to γ-Al_2O_3 by heating. The special surface area of the ultrafine γ-Al_2O_3 powder sample is 159.2 m ̄2·g ̄(-1).
【Fund】: 国家自然科学基金
【CateGory Index】: O614.31
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