水热法制备介孔氧化铝的形貌演化研究（英文）

Morphology Evolution in Hydrothermal Synthesis of Mesoporous Alumina

以硫酸铝铵、尿素为原料,PEG2000作为分散剂,通过水热法合成了三种形貌的勃姆石（AlOOH）。实验结果显示,调节水热温度可以制备出AlOOH微球、微纤维和3D分级结构的AlOOH。经SEM分析可知,在煅烧过程中,AlOOH分解转化为γ-Al2O3,该过程为拓扑过程,即形貌未发生变化。TEM结果显示,介孔均匀地分布在AlOOH内。基于此,我们提出了温度-形貌生长机制。此外,还研究了γ-Al2O3的光致发光性能,以325 nm为激发光谱时,其发生光谱的波长在380～500 nm,光谱中心在409和467 nm处。

Boehmite with varied morphologies was successfully synthesized from aluminum ammonium sulfate hydrate and urea, as well as poly-glycol-2000 by hydrothermal method. The experimental results show that boehmite microspheres, microfibers and 3D hierarchical structured AlOOH can be fabricated only by adjusting hydrothermal temperature. SEM images indicate that boehmite decomposes into γ-Al2O3 phase after heat-treatment through a topotactical process. TEM studies present that the mesopores are formed in γ-Al2O3 particles. Based on these investigations, a temperature-dependent morphology formation mechanism is proposed. Besides, the as-synthesized alumina excited at 325 nm shows emission in the range of 380 nm to 500 nm, centered at 409 nm and 467 nm.