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Facile Route Using Highly Arrayed PMMA Spheres as Hard Template for the Fabrication of 3D Ordered Nanoporous MgO
Hui-ning Li1, Hong-xing Dai*1, Hong He1, Chak Tong Au2
1.Laboratory of Catalysis Chemistry and Nanoscience, Department of Chemistry and Chemical Engineering, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100022, China;2.Department of Chemistry, Center for Surface Analysis and Research, Hong Kong Baptist University,Kowloon Tong, Hong Kong, China
Abstract:
"Using magnesium nitrate as Mg source and regularly packed polymethyl methacrylate (PMMA) spheres were synthesized via a combined strategy of emulsifier-free emulsion polymerization and water floating technique as hard template, we fabricated ordered nanoporous magnesium oxide. The synthesized PMMA and MgO samples were characterized by N2 adsorption-desorption, X-ray diffraction, high-resolution scanning electron microscopy, transmission electron microscopy, and selected area electron diffraction. It was observed that the synthesized PMMA spheres possessed a uniform diameter of approximately 284 nm and were in a highly ordered array, and the MgO generated by using the PMMA-templating method exhibited polycrystallinity with three-dimensionally ordered pores. BET surface area of the synthesized MgO sample is 100.7 m2/g, pore volume is 0.46 cm3/g, wall thickness is 4-24 nm, and pore sizes are in the range of 10-120 nm. Such a 3D high-surface-area nanoporous strongly basic MgO is useful in the applications of catalyst supports and acidic gas adsorbents."
Key words:  Hard-templating synthesis, Polymethyl methacrylate microsphere, Three-dimensional porous MgO, Electron microscopy
FundProject:
附件
有序排列PMMA 模板法合成三维有序纳米孔道MgO
李惠宁1, 戴洪兴*1, 何洪1, 区泽堂2
1.北京工业大学环境与能源工程学院化学化工系, 催化化学与纳米科学研究室, 北京100022;2.香港浸会大学化学系,表面分析及研究中心,九龙
摘要:
"利用由无乳化剂的乳液聚合法和水浮法联用技术合成得到的有序排列的聚甲基丙烯酸甲酯(PMMA)微球为硬模板,以硝酸镁为镁源,并采用硝酸镁-柠檬酸-乙醇混合溶液浸渍PMMA微球后经干燥以及先后在300 ℃恒温灼烧3 h和500 ℃恒温灼烧5 h,制备出具有有序纳米孔道结构的MgO粒子.应用X射线衍射、高分辨扫描电子显微镜、透射电子显微镜/选区电子衍射以及N2吸附-脱附法等技术表征了PMMA和MgO样品的物理化学性质.结果表明,所得PMMA微球颗粒较为均匀,粒径约为284 nm,且排列规整有序.由PMMA硬模板
关键词:  硬模板法,聚甲基丙烯酸甲酯微球,三维纳米孔道氧化镁,电子显微镜方法
DOI:10.1088/1674-0068/20/06/697-700
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