Start
Oct 06, 2010 - 16:00
End
Oct 06, 2010 - 17:30
Venue
Creativity Hall (Room No. 118)
Event Type
Speaker
Prof. Sung-Min Choi Department of Nuclear and Quantum Engineering KAIST Daejeon Korea
Title
Neutron and X-ray Scattering Investigations of Hierarchical Self Assembly of One-Dimensional Nanoparticles in Soft Matter.
Abstract: Hierarchical self-assembly of 1D nanoparticles such as carbon nanotubes or nanorods into highly ordered superstructures in soft matter has been of great interest as a route toward materials with new functionalities. Amphiphilic molecules such as block copolymers and surfactants exhibit rich phase behavior and have been used extensively as excellent templates for highly ordered nanostructure materials with various architectures. Therefore utilization of the rich phase behavior of amphiphilic molecules may provide a general and inexpensive way for fabricating a large variety of self-assembled and highly ordered arrays of 1D nanoparticles without going through complicated preparative procedures. In this talk two examples of recent studies in this direction will be presented. The first example is thermally switchable 1D and 2D arrays of individually isolated single-wall carbon nanotubes (SWNTs) using cooperative self-assembly of functionalized SWNTs and a block copolymer/water system. The second example is a new phase diagram of negatively charged 1D nanoparticle and cationic liposome complexes in water that exhibit three different highly ordered phases intercalated lamellar doubly intercalated lamellar and centered rectangular phases. The structures and self assembling mechanisms are investigated by small angle neutron and x-ray scattering techniques.About the Speaker: Sung-Min Choi is Professor in the Department of Nuclear and Quantum Engineering Korea Advanced Institute of Science and Techonology 373-1 Guseong-dong Yuseong-Gu Daejeon 305-701 South Korea His Research Interests: Neutron Scattering Studies of Nano-Materials and Superconductivity Nuclear Magnetic Resonance Imaging and Spectroscopy Education: MIT Cambridge MA USA PhD. in Applied Radiation Physics Department of Nuclear Engineering September 1998. MIT Cambridge MA USA M.S. in Radiological Science Department of Nuclear Engineering January 1996. Seoul National University Seoul Korea M.S. Department of Nuclear Engineering February 1990. Seoul National University Seoul Korea B.S. Department of Nuclear Engineering February 1988.