Nanotechnology

  2009 JUL 6 - (VerticalNews.com) -- According to a study from Tianjin, People's Republic of China, "First-principles computations have been preformed to investigate the stability of one-dimensional (1D) crystalline nanowires, faceted nanotubes, and conventional single-walled nanotubes (SWNTs) with various sizes, as well as the two-dimensional infinitely single layers for several wurtzite materials. Regardless of the diameters, the SWNTs are more stable than sp(3)-dominated faceted nanotubes and nanowires for BN and C, while for AlN, GaN, ZnO, ZnS, and Si, the faceted nanotubes and nanowires are always more preferred energetically than SWNTs. ...read more

  2009 JUN 29 - (VerticalNews.com) -- "The response of water-soluble, mercaptocarboxylic acid-capped fluorescent semiconductor nanoparticles, or quantum dots (QDs), to extended visible-light irradiation is variable and poorly described. Here we use time-resolved spectroscopy to investigate the photoluminescence intensities and lifetimes of CdSe/ZnS and CdTe QDs as a function of blue light illumination," scientists in Montreal, Canada report ...read more

  2009 JUN 29 - (VerticalNews.com) -- According to recent research from the United States, "The quality of the newly added, empirical dispersion correction in density functional theory (DFT) calculations is examined for several supramolecular complexes of fullerene (C-60) with free-base and metal porphyrins (Por). The benzene dimer (C6H6)(2), naphthalene dimer (C10H8)(2), and anthracene dimer (C14H10)(2) were also included in the study for comparison. ...read more