| 초록 |
Al2O3 (alumina) nanofibers for absorbent and catalyst have been synthesized by ex-situ simple two-step processes consisting of the hydrolysis and dehydration of spherical Al nano powders with the sizes of 80 to 120nm. Both boehmite, AlO(OH) and bayerite, Al(OH)3 were produced as an end product of hydrolysis depending on the hydrolysis temperature and upon subsequent dehydrations, boehmite, AlO(OH) and bayerite, Al(OH)3 were completely transformed into the crystalline Al2O3 phase above 420oC and 500oC, respectively. The produced Al2O3 as well as AlO(OH) was clearly nano fibrous and co-mingled with the typical diameters of 2 to 5nm and lengths of 20-100nm, whereas the produced Al(OH)3 was wedge structure. A strong dependence of the structural properties of the final Al2O3 on the hydrolytic reaction is observed, implying that the morphological properties of Al2O3 interrelated strongly with the phase structure of the end product of hydrolytic reaction. |
