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Green Forming Methods to Apply to Truly Nanoscaled Particles

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SEMINAR Key Laboratory of Transparent Opto-fuctional Inorganic Materials, Shanghai Institute of Ceramics, Chinese Academy of Sciences 中国科学院上海硅酸盐研究所透明光功能无机材料重点实验室 Green Forming Methods to Apply to Truly Nanoscaled Particles  

 

 

 

  Speaker  

  Dr. Maxim Ivanov   

  Institute of Electrophysics of the Ural Branch of the Russian Academy of Sciences  

  时间:12月8日 (周二)13:30 PM  

  地点:4号楼3楼会议室  

  联系人:潘裕柏 研究员(2820)  

            研究员(2816  

  Brief introduction: Dr. Ivanov is a Vice-director of the Institute of Electrophysics (IEP) of Russian Academy of Sciences (Yekaterinburg, Russia). His background includes M.S. degree from Ural State University (Russia, 1993), and Ph.D. in Materials Science and Engineering from the IEP (2000). Consentaneously with his current position, Dr. Ivanov served as a Visiting Professor at Shanghai Institute of Ceramics of Chinese Academy of Sciences (China, 2011), a Visiting Researcher at Münster University of Applied Sciences (Münster, Germany, 2013) and a Foreign Expert at the Guangdong University of Technology (Guangzhou, China, 2015). His expertise covers a broad area of nanoparticles, optical, laser and scintillator ceramics, ceramics for solid oxide fuel cell (SOFC). He has 22 years’ experience in basic science, research and development. His researches focus on synthesis of nanoparticles, as well as improving the ceramic materials by regulating microstructure evolution using innovative approaches including laser synthesis of nanopowders, pulse-magnetic compaction, slip and tape casting, sintering stress analysis. He played a key role in development of nanopowder laser fabrication technology and was one of the firsts to transfer this technology from laboratory to industry. 

  Abstract: The development of new technologies to produce highly transparent ceramics needs the application of ever smaller particles of starting materials. Optimized methods, like homogeneous precipitation or combustion technique, can produce inorganic submicronic particles with a narrow size distribution. However, to accomplish high-quality, truly nanoscaled particles, new methods of preparation are still of high interest. Among a number of preparation methods for true nanoparticles, laser synthesis (laser supported material evaporation and subsequent vapor condensation) is particularly promising, since it yields perfect, highly pure, weakly agglomerated, spherical nanoparticles with a narrow size distribution. Such nanoparticles could lead to an excellent optical material, if one can learn how to transform them to nanocrystalline, fully dense thin films and ceramics. Among others colloidal methods of tape, slip castings and electrophoretic deposition are commonly used to fabricate the films and ceramics. The methods need an organic dispersant to stabilize suspensions of particles, but the dispersants are mostly developed to stabilize micron and submicron particles and not predictable efficient, especially taking in account complicated surface chemistry, in the case of nanoparticles. 

  The presentation deals with different preparation techniques of compacting the nanoparticles into flaw-free green body to sinter highly transparent ceramics. 

 
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