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Synthesis and Characterization of Pr(DPM)_3 Served as Precursor for MOCVD

Chemical Research in Chinese Universities 2007年第3期23卷 258-262页

作者： LIU Ming-fei HU Yong-xing JIANG Yin-zhu GAO Jian-feng WANG Yan-yan MENG Guang-yao ustc laboratory for solid state chemistry ＆ inorganic membranes Department of Materials Science and Engineering University of Science and Technology of China Hefei 230026 P. R. China

Praseodymium β-diketone chelate, Pr （DPM）3 [ DPM = 2,2,6,6 -tetramethyl-3,5-heptanedionato ], was successfully synthesized from the inorganic salt praseodymium chloride and HDPM（2,2,6,6-tetramethyl-3,5-heptane-dione） in an ethanol/aqueous solution followed distillation at low pressure and recrystallization from toluene. The physical and thermal properties of the chelate, including volatility, stability, and thermal decomposition, were investigated by elemental analyses, 1^H NMR spectroscopy, XRD, TG/DTG/DTA analysis, infrared spectroscopy, and mass spectroscopy. The chelate with high purity prepared by the authors of this study also shows sufficient volatility and Stability in inert gases, which could be used as the precursor for metal-organic chemical vapor deposition（MOCVD）.

关键词： MOCVD Chemical synthesis Thermo-gravimetric analysis Infrared spectroscopy

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Ceramic membrane separation technique for washing nano-sized ceramic powder precursors

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Particuology 2011年第5期9卷 492-496页

作者： Qiang Dong Xingqin Liu Tianshu Zhang Department of chemistry ＆ Materials Engineering. Hefei University Hefei 230022 China ustc lab for solid state chemistry and inorganic membranes Department of Materials Science ＆ Engineering University of Science ＆ Technology of China Hefei 230026 China School of Materials Science and Engineering The University of New South Wales Sydney NSW2052 Australia

Washing using ceramic micro-filtration membranes was studied in the preparation of nano-sized TiO2 and A1203 powder precursors obtained by wet chemical methods. The key parameters for the washing process, such as operation pressure, cross-flow velocity, and slurry concentration, were examined and optimized. The shape and size of particles influenced the structure of the filter cake, leading to different permeation flux for different systems. The results demonstrated that washing using ceramic membranes is superior to the traditional plate-and-frame filtration and could be considered an advanced technique for ultra-fine powder preparation by wet-chemical method.

关键词： Nano-sized ceramic powder Wet-chemical method Ceramic membrane Washing Filtration

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