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        Synthesis of γ-Al₂O₃ nanopowder by the sol-gel method: Effect of different acid precursors on the superficial, morphological and structural properties

        Arquímedes Cruz-López,Odilón Vázquez Cuchillo,Isaías Juárez Ramírez,Lilia M. Bautista-Carrillo,Elvira Zarazua-Morin 한양대학교 세라믹연구소 2008 Journal of Ceramic Processing Research Vol.9 No.5

        The main aim of this investigation is to study the effect of three acid precursors (nitric acid, acetic acid and citric acid) during the synthesis of γ-Al2O3 nanopowder by the sol-gel method. The TEM analyses showed that the γ-Al2O3 prepared by using the strongest acid were irregular nanofibers with a length of 50 nm and a diameter of 5 nm, while the γ-Al2O3 prepared with citric acid showed agglomerates. On the other hand, the SEM analyses showed very similar morphologies. The N2-physisorption analyses confirmed that there is a relationship between the acidity and the surface area; and between the presence of mesopores and micropores on the surface of the synthesized Al2O3. The effect of the acid strength on the surface area was as follows: nitric acid (347 m2·g−1) > acetic acid (252 m2·g−1) > citric acid (164 m2·g−1). In addition, the XRD results confirmed that for all the samples thermally treated at 600 oC, the main phase was γ-Al2O3; nevertheless, the thermal analyses showed that the γ-Al2O3 synthesized with the weakest acid was not stable above 600 oC. The main aim of this investigation is to study the effect of three acid precursors (nitric acid, acetic acid and citric acid) during the synthesis of γ-Al2O3 nanopowder by the sol-gel method. The TEM analyses showed that the γ-Al2O3 prepared by using the strongest acid were irregular nanofibers with a length of 50 nm and a diameter of 5 nm, while the γ-Al2O3 prepared with citric acid showed agglomerates. On the other hand, the SEM analyses showed very similar morphologies. The N2-physisorption analyses confirmed that there is a relationship between the acidity and the surface area; and between the presence of mesopores and micropores on the surface of the synthesized Al2O3. The effect of the acid strength on the surface area was as follows: nitric acid (347 m2·g−1) > acetic acid (252 m2·g−1) > citric acid (164 m2·g−1). In addition, the XRD results confirmed that for all the samples thermally treated at 600 oC, the main phase was γ-Al2O3; nevertheless, the thermal analyses showed that the γ-Al2O3 synthesized with the weakest acid was not stable above 600 oC.

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