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Soft Processing for Ceramics: Single-Step Fabrication of Nano-Structured Ceramics Patterns from Solution without Post-Firing

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SEMINAR
Structural Ceramics Research Center
State Key Laboratory of High Performance Ceramics
and Superfine Microstructure
结构陶瓷工程研究中心 高性能陶瓷和超微结构国家重点实验室


Soft Processing for Ceramics: Single-Step Fabrication of Nano-Structured Ceramics Patterns from Solution without Post-Firing

Masahiro YOSHIMURA
吉田昌弘教授

Materials and Structures Laboratory, Tokyo Institute of Technology
Yokohama, Japan

时间:2008年11月19日 (星期三)10:00-11:00
地点:二号楼六O七会议室
联系人: 曾宇平, 刘茜


欢迎广大科研人员和研究生参与讨论!


Introduction

Since 1989 when we found a method to fabricate BaTiO3 film on Ti substrate in a Ba(OH)2 solution at low temperatures of 60-200℃, we have proposed an innovative concept and technology, “Soft Processing” or “Soft Solution Processing,” which aims low energetic (=environmentally benign) fabrication of shaped, sized, located, and oriented ceramic materials in/from solutions1,2).  It can be regarded as one of bio-inspired processing, green processing, or eco-processing.  When we have activated/stimulated interfacial reactions locally and/or moved the reaction point dynamically, we can get patterned ceramic films directly in solution without any post heating, masking or etching.  Those Direct Patterning methods differ from previous patterning methods which consist of multi-step processes, for example:  (1) synthesis of particles of compounds or precursors, (2) dispersion of the particles into a liquid (“ink”),  (3) patterning of the particles on a substrate by printing of the “ink”, (4) consolidation and/or fixing of the particles’ pattern by heating1, 2).

The notable feature of Direct Patterning is that each reactant reacts directly on site, at the interface with the substrate.  Therefore, the chemical driving force of the reaction, A+B=AB, can be utilized not only for synthesis but also for crystallization and/or consolidation of the compound AB.  It is rather contrasting to general patterning methods where thermal driving force of post-firing is mostly used for the consolidation of the particles(1, 2).

We have developed the Direct Patterning of CdS, PbS, and CaWO43) on papers by ink-jet reaction method and LiCoO2 by electrochemically activated interfacial reactions.  Furthermore, we have succeeded to fabricate BaTiO3 patterns by a laser beam and carbon patterns by a needle electrode directly in solutions4).  Recent success in TiO2 and CeO2 patterns by Ink-jet deposition below 300℃ will be presented3).

References

(1) Yoshimura, M., J. Mater. Sci.,41 [5],1299-1306 (2006),43[7]2085-2103(2008)
(2) Yoshimura, M., J. Ceram Soc. Japan, 114 [11] pp. 888-895(2006)
(3) Gallage, R., Yoshimura, M., et al., J. Electroceram, 16, 533-536  (2006) , Mater. Sci. Eng., 137, 299-303 (2007),J.Am.Ceram.Soc. 91[7]2083-2087(2008)
(4) Watanabe, T., Yoshimura, M., et al., Thin Solid Film, 515, 2696-2699 (2006), Carbon, 44, 799-802 (2006)
(5) Yoshimura, M. and Gallage R., Solid State Electrochem., 12[7/8]775-782(2008)

CURRICULUM VITAE

1.Name:
Masahiro YOSHIMURA
             
2.Profession:Professor Emeritus
Materials and Structures Laboratory, Tokyo Institute of Technology
4259, Nagatsuta, Midori, Yokohama, 226-8503 Japan
Tel: 81­45­924­5323; Fax: 81­45­924­5358
E­mail: yoshimura@msl.titech.ac.jp

3. Academic carriers:  
April 170 ­ June 1978, Research Laboratory of Engineering Materials, Tokyo Institute of Technology
Nov. 1973 - Nov. 1974, Laboratoire des Ultra­Réfractaires, C.N.R.S, Odeillo, France (Director: Dr. M. Foex)
July 1974 ­ Aug. 1974, Centre de Recherches sur la Physique des Hautes, Temperatures, C.N.R.S., Orleans, France
Dec. 1974 ­ May 1975, Laboratoire de Chimie Appliqee de l’Etat Solide, C.E.C.M., Vitry­sur­Seine, France
Sept. 1975 ­ Aug. 1977, Materials Science and Engineering Laboratory, Massachusetts Institute of Technology, Cambridge, Mass., U.S.A
July 1978 - June 1985,Associate Professor, Research Laboratory of Engineering Materials, Tokyo Institute of Technology
July 1985-May 1996,Professor, Research Laboratory of Engineering Materials, Tokyo Institute of Technology
May, 1996-March2008,  Professor, Materials and Structures Laboratory , Tokyo Institute of Technology
July 1996 - March 2003,  Director, Center for Materials Design
April 2008- Professor Emeritus
April 2008 - Visiting Provessor,Institute of Materials Research, Tohoku University,Sendai,Japan
July 2008- Visiting Professor,Dept. of Materials Sci.,University of  Limerick,Limerick, Ireland
Sept. 2008- Visiting Professor, Non-metallic Materials, ETH,Zurich,Switzerland

4. Publications:  670 papers in peer-reviewed Journals, 84 review papers, 3 books and 44 book chapters, and other 80 papers. 30 Patents.Full lists of Publications available in.