Nanotechnology

  2010 APR 26 - (VerticalNews.com) -- According to recent research from Ouro Preto, Brazil, "A new class of boron nitride fullerenes, which are stoichiometric and presents homopolar bonds, is proposed in this work."

  "A combined first-principles/elastic-model approach predicts that stoichiometric fullerenes with more than 1000 atoms which present homopolar bonds are energetically more stable than those without homopolar bonds. The HOMO-LUMO gap of stoichiometric fullerenes with homopolar bonds is 1.7 eV smaller than that of fullerenes without homopolar bonds, which may lead to distinct optical and electrochemical properties," wrote R.J.C. Batista and colleagues, Federal University ...read more

  2010 APR 26 - (VerticalNews.com) -- According to a study from Changchun, People's Republic of China, "Lithium salt of substituted nanotube is suggested as a new kind of nonlinear optical (NLO) material."

  "It is found that the combination of the lithiation effect and the donor substitution effect can greatly enhance the static first hyperpolarizability (beta(0)). Specially, the unusual donor - acceptor( nanotube) - donor system Li-NT(6,0)-(NH2)(2) has considerable beta(0) to be 6.8 x 10(5) au, due to its small transition energy and large transition moment," wrote F. Ma and colleagues, Jilin University ...read more

  2010 APR 26 - (VerticalNews.com) -- "Two-photon photoemission (2PPE) spectroscopy was employed for size-selected silver nanoparticles (Ag NPs) deposited on a hydrogen-terminated Si(1 1 1) [H-Si(1 1 1)] to reveal photoemission enhancement through local surface plasmon resonance (LSPR)," scientists in Yokohama, Japan report.

  "At low coverage of Ag NPs around 0.005 monolayer equivalents (MLE), the photoemission from the H-Si(1 1 1) substrate was enhanced by similar to 2 x 10(2) times. Above 0.10 MLE, in contrast, photoemission from the Ag NPs themselves was observed," wrote T. Nakamura and colleagues, Keio University ...read more