tailieunhanh - Báo cáo hóa học: "Preparation and Characterization of Mesoporous Zirconia Made by Using a Poly (methyl methacrylate) Template"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Preparation and Characterization of Mesoporous Zirconia Made by Using a Poly (methyl methacrylate) Template | Nanoscale Res Lett 2008 3 118-122 DOI s11671-008-9123-7 NANO EXPRESS Preparation and Characterization of Mesoporous Zirconia Made by Using a Poly methyl methacrylate Template Guorong Duan Chunxiang Zhang Aimei Li Xujie Yang Lude Lu Xin Wang Received 29 November 2007 Accepted 14 February 2008 Published online 28 February 2008 to the authors 2008 Abstract Superfine powders of poly methyl methacrylate PMMA have been prepared by means of an emulsion polymerization method. These have been used as templates in the synthesis of tetragonal phase mesoporous zirconia by the sol-gel method using zirconium oxychloride and oxalic acid as raw materials. The products have been characterized by infrared spectroscopy X-ray diffraction analysis transmission electron microscopy N2 adsorption-desorption isotherms and pore size distribution. The results indicate that the average pore size was found to be nm. Keywords Zirconia Mesoporous PMMA Sol-gel Template Introduction Due to their large surface areas controllable pore size and easy functionalization 1 mesoporous materials have opened many new possibilities for applications in catalysis as catalyst supports in separation science and in drug delivery as well as for protein encapsulation. Over the past few decades preparation techniques for mesoporous structures have attracted the attention of many researchers 2-4 . Most research in this field has been focused on silica as a framework structure 5 6 . However mesoporous G. Duan H A. Li Ruidi Engineering Technology Center Nanjing Hydraulic Research Institute Nanjing 210024 . China e-mail duangr2003@ G. Duan C. Zhang X. Yang L. Lu X. Wang Materials Chemistry Laboratory Nanjing University of Science Technology Nanjing 210094 . China materials derived from transition metal oxides rather than silica frameworks are expected to be quite useful for several applications 7 8 . At present stabilized t-ZrO2 at room temperature is considered to be an important .