(遼寧省無機超細(xì)粉體制備及應(yīng)用重點實驗室 大連交通大學(xué)，大連 116028)
摘 要: 采用水熱法制備了三維形狀的薄水鋁石粉體，研究前驅(qū)體對薄水鋁石微觀結(jié)構(gòu)的影響。研究結(jié)果表明：以硝酸鋁為前驅(qū)體可獲得納米薄片組裝成的花型AlOOH，直徑為1 μm左右，在其形成過程中無機−有機協(xié)同作用起到關(guān)鍵作用；以氯化鋁為反應(yīng)物可以獲得由納米棒組裝而成的三維海膽型超結(jié)構(gòu)AlOOH，其直徑范圍為5~ 8 μm，是由于中間產(chǎn)物AlOCl的溶解再結(jié)晶引起；以硫酸鋁為前驅(qū)體可以獲得中空球形AlOOH，其直徑范圍為5~8 μm，形成機制是由于中間產(chǎn)物堿式硫酸鋁的溶解再結(jié)晶引起。水熱法獲得的薄水鋁石可以在600 ℃時轉(zhuǎn)變?yōu)間-Al2O3，并仍保持原有形貌。
關(guān)鍵字: 薄水鋁石；前驅(qū)體；微觀結(jié)構(gòu)；水熱法
（Liaoning Key Laboratory for Fabrication and Application of Superfine Inorganic Powders,
Dalian Jiaotong University, Dalian 116028, China）
Abstract:Three-dimensional (3D) boehmite architectures were synthesized via a hydrothermal method. The effect of precursors on the morphology of boehmite was investigated. The results show that the flower-like AlOOH with diameter of about 1 μm assembled by nano-plates can be obtained using Al(NO3)3 as the precursor. The organic and inorganic cooperation plays a key role in the formation process. 3D urchin-like AlOOH superstructures consisting of nanorods are fabricated using hydrate AlCl3 as reagents with diameter of 5−8 μm. The dissolution and recrystallinity of semi-finished product AlOCl caused to form the structures. The hollow boehmite spheres with diameter of 5−8 μm were prepared using Al2(SO4)3 as precursor. The formation mechanism is also due to the dissolution and recrystallization of semi-finished product basic sulfate aluminum. Boehmite prepared by hydrothermal treatments transforms to g-Al2O3 at 600 ℃. The morphologies of g-Al2O3 powders still keep their original shapes.
Key words: boehmite; precursor; microstructure; hydrothermal method
