Technology Lecture: Structuring of Silicon-based Materials: Hybrid Silica and Silicon Carbide
Date: 18 Dec 2008 - 18 Dec 2008
Venue: SIMTech Auditorium, Level 3
Nanomaterials with sought-after properties are presently in great demand with increasing interest and desire for application. In this field of research, extensive works, mainly based on organosilicon chemistry, have been devoted to the development of new organic-inorganic materials. This presentation will focus on the bottom-up synthesis and on the characterisation of structured silicon-based materials: sol-gel hybrids and silicon carbide.
(i) Sol-Gel hybrids: Sol-gel process provides an efficient method for preparing hybrid materials with combined organic and inorganic properties which may be exploited in several fields of applications. In this context, bridged silsesquioxanes have developed as a fascinating bottom-up approach for the synthesis of functional hybrid materials with targeted properties. In the past years, increasing efforts have been dedicated to the structuring of these hybrid materials and several shape-controlled bulk hybrid materials (lamellar, tubular and helical) have recently been reported using controlled self-assembly of bis-silylated organic fragments through the H-bonds of incorporated urea groups. We also recently reported a new route to synthesize bridged silsesquioxanes starting from two different organosilyl compounds derived from adenine and thymine. The molecular recognition interactions combined with other weak interactions are the key roles to achieve the structuring of these materials.
(ii) Silicon Carbide (Si-C): Si-C possesses remarkable mechanical and thermal properties and is usually obtained as a dense material. New strategies for obtaining porous Si-C are being developed and templating systems are commonly employed to achieve their structuring. A molecular approach via polysilanes and using commercial silica spheres as template will be discussed.
About the Speaker
Dr M Wong Chi Man is a high profile scientist in the area of Organic and Organometallic Chemistry, Materials Chemistry and more recently he is involved in organosilicon polymers and silicon carbide. He is currently leading a research group in Laboratoire Architectures Moléculaires et Matériaux Nanostructurés (Institute Charles Gerhardt Montpellier UMR CNRS 5253) at the Ecole Nationale Supérieure de Chimie de Montpellier (France).
He holds a PhD in Chemistry from the University of Montpellier 2 (France) in 1987. After completing his post-doctoral research as an Alexander von Humboldt fellow at the University of Heidelberg (Germany), he became associate professor at the University of Montpellier 2 in 1990. His current research interests include Sol-Gel Chemistry, Organic and Organometallic Chemistry, Materials Chemistry and more recently he is involved in organosilicon polymers and silicon carbide.
He was the co-chair of XIVth International Sol-Gel Conference held in September 2007 and the member of the International Advisory Board Committee of the "International Sol-Gel Conference" and of the "International Symposium on Organosilicon Chemistry" meeting. He was also a member of the National Scientific Committee of the (CNRS) French National Research Council (2000-2003). He was a visiting scientist at the Universitat Autonoma de Barcelona (Spain) in 2004 and at the Australian Nuclear Science & Technology Organisation (ANSTO) in 2006 (Sydney-Australia). Dr Wong Chi Man has co-authored nearly a hundred of scientific publications in peer-reviewed international journals and has co-authored 3 patents.
9.45am : Registration & Refreshments
10.15am : Presentation by Dr Wong Chi Man
11.15am : Q&A
11.30am : End
Who Should Attend
R&D managers, engineers technologists, academic staff and researchers involved in synthesis of organic-inorganic hybrid materials, development of thin film for optical electronic devices etc.
Pre-registration for the seminar is free of charge. To reserve a place, please click here.
For technical enquiries:
Dr Chen Quan, Tel: 6793 8433
For registration and general enquiries:
Alice Koh, Tel: 6793 8249