Zhu Yuanna, Yang Ping, Cao Yongqiang, Wang Yingzi, Xu Chuanchuan, Wang Dan, Zhao Jie
J Nanosci Nanotechnol. 2017 Feb;17(2):1413-419. doi: 10.1166/jnn.2017.12768.
Polyhedral Fe₃O₄ hollow spheres were synthesized using hexamethylenetetramine as structure-directing agent and the effect of hexamethylenetetramine on the morphology was investigated in detailed. The comparison for samples prepared with and without hexamethylenetetramine indicated that hexamethylenetetramine played a vital role in the formation process of the hollow polyhedral structure. The formation process and growth mechanism of Fe₃O₄ spheres with hollow polyhedral morphology were preliminarily explored according to a detailed time-dependent morphology and structure evolution. It was deduced that the hollow polyhedral structure can be ascribed to the cooperation of oriented aggregation and Ostwald ripening mechanisms. The as-prepared Fe₃O₄ hollow spheres with polyhedral structures which possess high magnetization saturation value (73 emu/g) at room temperature, large cavity and huge specific surface area (57.12 m2·g–1) are expected to have wide potential applications, for example in the drug delivery process, magnetic separation and waste treatment in the future.
以六亚甲基四胺为结构导向剂合成了多面体Fe₃O₄空心球，并详细研究了六亚甲基四胺对其形貌的影响。对添加和未添加六亚甲基四胺制备的样品进行比较表明，六亚甲基四胺在空心多面体结构的形成过程中起着至关重要的作用。根据详细的随时间变化的形貌和结构演变，初步探索了具有空心多面体形貌的Fe₃O₄球的形成过程和生长机制。推断空心多面体结构可归因于定向聚集和奥斯特瓦尔德熟化机制的协同作用。所制备的具有多面体结构的Fe₃O₄空心球在室温下具有高饱和磁化强度值（73 emu/g）、大空腔和巨大比表面积（57.12 m2·g–1），有望在未来的药物递送、磁分离和废物处理等方面具有广泛的潜在应用。
