Nanotechnology

New physical chemistry research from P. Umek and co-researchers described

  2008 NOV 17 - (VerticalNews.com) -- "Copper doped sodium titanate nanotubes and nanoribbons were prepared via two different doping methods called in situ and ex situ," scientists in Ljubljana, Slovenia report.

  "In the applied in situ method, titanate nanotubes were grown from anatase TiO2 doped with Cu2+, while in the ex situ method, titanate nanotubes and nanoribbons were exposed to aqueous solution of Cu2+ species. By correlating XRD, electron microscopy, magnetic susceptibility, and electron paramagnetic resonance (EPR) measurements, we found that in the samples prepared via the ex situ doping method, sub-10 nm CuO nanoparticles grow on the inner/outer surface of nanotubes/nanoribbons where the Neel transition temperature is strongly suppressed," wrote P. Umek and colleagues.

  The researchers concluded: "In fact, they behave as superparamagnets with a blocking temperature of around 50 K. Strong evidence that Cu2+ species that form complexes between titanate layers coordinate with Na+ ions comes from the pulsed EPR data."

  Umek and colleagues published their study in the Journal of Physical Chemistry C (Coordination of intercalated Cu2+ sites in copper doped sodium titanate nanotubes and nanoribbons. Journal of Physical Chemistry C, 2008;112(39):15311-15319).

  For additional information, contact P. Umek, Jozef Stefan Institute, Jamova 39, SI-1000 Ljubljana, Slovenia.

  The publisher's contact information for the Journal of Physical Chemistry C is: American Chemical Society, 1155 16th St., NW, Washington, DC 20036, USA.

  Keywords: Emerging Technologies, Nanoparticle, Nanoribbon, Nanoribbons, Nanotech, Nanotechnology, NanotubePhysical Chemistry.

  This article was prepared by VerticalNews Nanotechnology editors from staff and other reports. Copyright 2008, VerticalNews Nanotechnology via VerticalNews.com.