Synthesis of mesoporous γ-AlOOH@Fe_3O_4 magnetic nanomicrospheres

作     者：Yuanyuan Zheng Shengfu Ji Hongfei Liu Ming Li Hao Yang 

作者机构：State Key Laboratory of Chemical Resource EngineeringBeijing University of Chemical Technology 

出 版 物：《Particuology》 (颗粒学报（英文版）)

年 卷 期：2012年第10卷第6期

页      面：751-758页

核心收录：

学科分类：07[理学] 070205[理学-凝聚态物理] 08[工学] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：Financial funds from the National Natural Science Foundation of China (Grant Nos. 21173018 and 21136001) 

主　　题：Magnetic nanomicrospheres Fe3O4 γ AIOOH shellMesoporousHydrolysis 

摘      要：Mesoporous γ-AIOOH@Fe3O4 magnetic nanomicrospheres were synthesized using superparamagnetic Fe304 nanoparticles as the core and aluminum isopropoxide （ALP） as the aluminum source. The obtained magnetic nanomicrospheres were characterized by X-ray powder diffraction （XRD）, transmission electron microscopy （TEM）, scanning electron microscopy （SEM）, N2 adsorption-desorption and vibrating sample magnetometry （VSM）. The effects of preparation parameters such as hydrolysis time of AIP, concentration of AlP and coating layer number on microspheres were investigated. The results indicated that the mesoporous γ-AIOOH@Fe3O4 magnetic nanomicrospheres consisted of a mesoporous γ-AIOOH shell and a Fe3O4 magnetic core. The diameter of γ-AIOOH@Fe3O4 nanomicrospheres was about 200 nm, the thickness of mesoporous γ-AIOOH shell was about 5 nm and the average pore size was 3.8 nm. The thickness of the mesoporous γ-AIOOH shell could be controlled via layer-by-layer coating times. The formation mechanism of the mesoporous γ-AIOOH shell involved a ＂chemisorption-hydrolysis＂ process.