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SUMMARY: Atomic Structure of Nanotubes and Nano-Clusters - Jian-Min Zuo\, 
 Department of Materials Science and Engineering and F. Seitz Materials Res
 earch Laboratory\, University of Illinois
DTSTART:20060612T140000Z
DTEND:20060612T150000Z
UID:TALK5123@talks.cam.ac.uk
CONTACT:Edmund Ward
DESCRIPTION:This talk will introduce the new science of atomic structure o
 f nanomaterials and their significance to our new understanding about prop
 erties and growth of these materials. Nanotubes and metallic nanoclusters 
 will be used as examples of study.  Nanotubes\, in particular of single wa
 ll carbon nanotubes\, have been one of major focus areas of nanoscience an
 d nanotechnology research because of their remarkable electrical and mecha
 nic properties. However\, the electric properties of carbon nanotubes (CNT
 ) are very sensitive to small structural differences. Metallic nanocluster
 s are important catalyst for energy and environmental applications. The at
 omic structure of metal clusters can be very different from bulk crystals.
  Information mostly comes from HREM. Consequently\, our understanding of t
 hese structures is subjected to the limitations of atomic resolution imagi
 ng.\nRecently\, we have developed a new electron diffraction technique\, n
 anoarea electron diffraction (NED)\, which is capable of structure determi
 nation of individual nanotubes and clusters using a nanometer-sized\, cohe
 rent\, parallel electron beam. We will illustrate the potential of this te
 chnique for atomic structure determination. The talk is divided into three
  parts. The first part will cover structure determination of single and do
 uble wall carbon and multiwall boron nitride nanotubes. The second part wi
 ll focus on our efforts to obtain atomic resolution images from coherent d
 iffraction patterns and its potential to image defects in individual nanoc
 lusters. The last part of this talk highlights other materials science pro
 blems that can be addressed by NED.\n
LOCATION:Austin Seminar Room\, Materials Science and Metallurgy\, Departme
 nt of
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