Facile preparation of three-dimensionally ordered macroporous alumina, iron oxide, chromium oxide, manganese oxide, and their mixed-metal oxides with high porosity
Facile preparation of three-dimensionally ordered macroporous alumina, iron oxide, chromium oxide, manganese oxide, and their mixed-metal oxides with high porosity
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DOI：
10.1021/cm071823r
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发表时间：
2007-11-13
影响因子：
8.6
通讯作者：
Ueda, Wataru
中科院分区：
文献类型：
--
作者：
Sadakane, Masahiro;Horiuchi, Toshitaka;Ueda, Wataru
本文介绍了一种制备三维有序大孔氧化铝、铁的简便方法。氧化物、氧化锰、氧化铬及其混合金属氧化物。将乙二醇-甲醇混合溶液渗透到单分散聚甲基丙烯酸甲酯（PMMA）球胶体晶体模板的空隙中。加热引起EG的硝酸盐氧化生成金属乙醛盐。进一步加热将乙醛酸盐转化为金属氧化物并分解PMMA，生成所需的3DOM金属氧化物。明确了该方法的两个重要参数，以获得高收率的有序3DOM结构：(1)硝酸盐氧化温度应低于PMMA的玻璃化转变温度。(2)应有效去除PMMA氧化分解产生的热量。此外，汞孔隙度测定证实了3DOM材料的高孔隙度（66-81%），可以在潜在的催化和过滤中方便地运输客体分子和颗粒。
This paper describes a facile method to produce three-dimensionally ordered macroporous (3DOM) alumina, iron.oxide, manganese oxide, chromium oxide, and their mixed-metal oxides. An ethylene glycol (EG)-methanol mixed solution of metal nitrates was infiltrated into the void of the colloidal crystal template of a monodispersed poly(methyl methacrylate) (PMMA) sphere. Heating initiated nitrate oxidation of the EG to produce metal glyoxylate salt. Further heating converted the glyoxylate salt to metal oxide and decomposed PMMA which produced the desired 3DOM metal oxides. Two important parameters of this method are clarified in order to produce a well-ordered 3DOM structure in high yield: (1) The nitrate oxidation temperature should be lower than the glass transition temperature of the PMMA. (2) The heat produced by oxidative decomposition of the PMMA should effectively be removed. Furthermore, high porosity (66-81%) of the 3DOM materials was confirmed by Hg porosimetry, which can permit facile transport of guest molecules and particles in potential catalysis and filtration.