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《Journal of Beijing University of Chemical Technology(Natural Science Edition)》 2008-05
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Use of anhydrous ethanol as solvent to prepare nano A1_2O_3 by a supercritical drying method

GAO Xi WANG JiDong QU YiXin LI Tao(College of Chemical Engineering,Beijing University of Chemical Technology,Beijing 100029,China)  
Nanosized AlOOH has been prepared by a combination of sol-gel and supercritical drying methods,using aluminum nitrate as the raw material,citric acid as dispersant and anhydrous ethanol as solvent.Nano γ-Al2O3 was obtained after calcination of the AlOOH at 500-900 ℃.The effects of varying the pH of the synthesis solution and the ratio of aluminium nitrate to citric acid on the particle size of AlOOH as well as the effect of varying the calcination temperature on the particle size of γ-Al2O3 were investigated.The morphology,particle size and structure of the products were characterized by TEM,IR and XRD.It was found that both the pH of the solution during the preparation of the sol-gel and addition of citric acid significantly affected the morphology and size of the AlOOH particles.At pH=3 with n(citric acid)∶n(aluminum nitrate)=1∶2,fibrous nano AlOOH particles(with a diameter of 1-10 nm and a length of 30-40 nm) were obtained.Calcination of the resulting nano AlOOH at 500-900 ℃ afforded fibrous nano γ-Al2O3 particles with a diameter of 1-10 nm and a length of 30-70 nm.
【CateGory Index】: TB383.1
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