2008 APR 28 - (VerticalNews.com) -- "The large eddy simulation method has been used to simulate the diffusion of H2SO4 vapor in the parallel twin jets. The distributions of number concentration and size of nanoparticles produced by nucleation and coagulation in sulfuric acid/water system are given," researchers in Hangzhou, People's Republic of China report.

  "The functions of the sulfur content, relative humidity and jet Reynolds number are evaluated according to the distributions of number concentration and size of nanoparticles. The results show that the nucleation in sulfuric acid/water system produces large number of nanoparticles, and gas-to-nanoparticle conversion mostly takes place in the middle and interface of the twin jets. The coagulation process of particles reduces the number concentration, while increases the mean particle size. For the case with higher sulfur content, more number and smaller size nanoparticles are produced by nucleation and coagulation," wrote Z.Q. Yin and colleagues, Zhejiang University ...read more

  2008 MAR 3 - (VerticalNews.com) -- "At the micro- and nanoscale, the standard continuity boundary conditions at fluid-solid interfaces of classical transport phenomena do not apply and must be replaced by boundary conditions that allow discontinuities. In this study, the classical thermal laminar boundary layer equations are studied using Lie symmetries with the no-slip boundary condition for tangential velocity and continuous temperature boundary conditions replaced by non-linear slip-creep-jump boundary conditions," scientists in Australia report ...read more

  2008 JAN 14 - (VerticalNews.com) -- According to recent research from the United States, "Layered nanocrystals consist of a core of one material surrounded by a shell of a second material. We present computation of the atomistic strain energy density in a layered nanocrystal, using an idealised model with a simple cubic lattice and harmonic interatomic potentials."

  "These computations show that there is a critical size r(s)* for the shell thickness r(s) at which the energy density has a maximum. This critical size is roughly independent of the geometry and material parameters of the system," wrote Y. Bae and colleagues, University of Arizona ...read more