72
nanotimes News in Brief
The U.S. needs more nanoscientists trained in neutron scattering techniques. To fill the gap, the National Science Foundation (NSF) will invest $3 million to train current and new scientists in this area. The grant will go to the University of Missou- ri, home of MU’s Research Reactor (MURR). The MURR is a facility uniquely equipped to help train a new generation of scientists in the use of neutron scattering techniques. The NSF funds will be mat- ched by UM with an additional $1.3 million.
http://murr.missouri.edu/
12-01 :: January 2012
Using quantum mechanical calculations, Swapnil Chandratre and Pradeep Sharma at University of Houston, USA, show that merely by creating holes of the right symmetry, graphene can be coaxed to act as a piezoelectric. They find that certain specifi- cally tailored porous graphene sheets can “acquire” piezoelectricity coefficient that is nearly 72% of the well-known piezoelectric (quartz) or 36% of boron nitride nanotubes. © APL/AIP
Swapnil Chandratre, Pradeep Sharma: Coaxing graphene to be piezoelectric, In: Applied Physics Letters, Volume 100(2012), Issue 2, January 09, 2012, Article 023114 [3 pages], DOI:10.1063/1.3676084:
http://dx.doi.org/10.1063/1.3676084
Huifeng Qian, Yan Zhu, and Rongchao Jin at Department of Chemistry, Carnegie Mellon University, Pittsburgh, USA, report the first exa- mple of gold nanocrystal molecules. Mass spec- trometry analysis has determined its formula to be Au333(SR)79 (R = CH2CH2Ph). This magic sized nanocrystal molecule exhibits fcc-crystallinity and surface plasmon resonance at approximately 520nm, hence, a metallic nanomolecule. The work opens up new opportunities for investigating many fundamental issues of nanocrystals, such as the formation of metallic state, and will have potential impact on condensed matter physics, nanochemi- stry, and catalysis as well. © PNAS
Huifeng Qian, Yan Zhu, and Rongchao Jin: Atomically precise gold nanocrystal molecules with surface plasmon resonance, In: PNAS, Vol 109(2012), No.3, January 17, 2012, Pages 696-700, DOI:10.10:73/pnas.1115307109:
http://dx.doi.org/10.10:73/pnas.1115307109
Researchers at Helmholtz Zentrum Berlin (HZB) in Germany have developed a new microscope for high spatial resolution X-ray spectroscopic studies. While conventional X-ray spectroscopy has so far fallen short of resolving single nanoparticles, the X- ray microscope at HZB’s synchrotron source BESSY II succeeds by using high-brilliancy X-rays. The HZB microscope can take pictures of nanoparticles inside object fields of up to 20 x 20μm2 with a CCD camera.
simultaneously
“An important advantage of our microscope is the time gain on top of the improved spectral resolution of 10,000,” says Dr. Peter Guttmann, physicist at HZB. “Unlike the scanning X-ray microscopes used so far for this, our microscope allow spectra to be recorded 100 times faster inside large object fields. We can use the HZB electron beam writer to pro- duce advanced lenses that will improve our method
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24 |
Page 25 |
Page 26 |
Page 27 |
Page 28 |
Page 29 |
Page 30 |
Page 31 |
Page 32 |
Page 33 |
Page 34 |
Page 35 |
Page 36 |
Page 37 |
Page 38 |
Page 39 |
Page 40 |
Page 41 |
Page 42 |
Page 43 |
Page 44 |
Page 45 |
Page 46 |
Page 47 |
Page 48 |
Page 49 |
Page 50 |
Page 51 |
Page 52 |
Page 53 |
Page 54 |
Page 55 |
Page 56 |
Page 57 |
Page 58 |
Page 59 |
Page 60 |
Page 61 |
Page 62 |
Page 63 |
Page 64 |
Page 65 |
Page 66 |
Page 67 |
Page 68 |
Page 69 |
Page 70 |
Page 71 |
Page 72 |
Page 73 |
Page 74 |
Page 75 |
Page 76 |
Page 77 |
Page 78 |
Page 79 |
Page 80 |
Page 81 |
Page 82 |
Page 83 |
Page 84 |
Page 85 |
Page 86 |
Page 87 |
Page 88 |
Page 89 |
Page 90 |
Page 91 |
Page 92 |
Page 93 |
Page 94 |
Page 95 |
Page 96 |
Page 97