nanotimes News in Brief
Prof. Rüssel and his colleagues of the Otto-Schott- Institute for Glass Chemistry have succeeded in producing a new kind of glass ceramic with a nanocrystalline structure, which seems to be well suited to be used in dentistry due to their high strength and its optical characteristics.
12-01 :: January 2012
Image: The glass-ceramics are produced according to an exactly specified temperature scheme. © Jan-Peter Kasper/FSU
Marc Dittmer, Christian Ruessel: Colorless and high strength MgO/Al2
O3 /SiO2 glass-ceramic dental materi-
al using zirconia as nucleating agent, In: Journal of Bio- medical Materials Research Part B: Applied Biomaterials, Volume 100B, Issue 2, February 2012, Pages 463-470, DOI:10.1002/jbm.b.31972: http://dx.doi.org/10.1002/jbm.b.31972
lifetime of electrons in graphene in lower ener- gy ranges. This is of great relevance for the future development of fast electronic and optoelectronic components. To be able to develop rapid electronic and optoelectronic components based on graphene, one has to know precisely how long electrons linger at specific energy levels. The examination of such processes, which occur in the picosecond range, requires extremely rapid observation methods. The unique feature of the experiments conducted at the Helmholtz-Zentrum in Dresden is the exposure of the graphene samples to light that had longer wave- lengths than ever before. This was made possible through the short radiation pulses of the HZDR’s Free Electron Laser (FEL). The researchers were, thus, able to study the lifetime of electrons near the contact point of the energy bands which is the unique physical property characteristic of graphene.
S. Winnerl, M. Orlita, P. Plochocka, P. Kossacki, M. Po- temski, T. Winzer, E. Malic, A. Knorr, M. Sprinkle, C. Berger, W. A. de Heer, H. Schneider, M. Helm: Carrier dynamics in epitaxial graphene close to the Dirac point, In: Physical Review Letters, Vol. 107(2011), Decem- ber 02, 2011, Article 237401, DOI:10.1103/PhysRev- Lett.107.237401:
Scientists from the Helmholtz-Zentrum Dresden- Rossendorf (HZDR, Germany) have added ano- ther important component towards understanding the material graphene: They have determined the
Optical techniques enable us to examine single molecules, but do we really understand what we are seeing? After all, the fuzziness caused by effects such as light interference makes these images very difficult to interpret. Researchers at the University of