Electron transport properties of boron nitride fullerene B24N24 doped with lithium atom: first-principles calculations

The transport properties of Li@B₂₄N₂₄ metallofullerene bridging two Au contacts are studied with a combined density functional theory and the non-equilibrium Green’s-function technique. Our calculated results show that the conductance of Li@B₂₄N₂₄ nanocage is generally higher than that of the undoped B₂₄N₂₄ molecule. We calculated the current–voltage characteristics for positive and negative bias voltages. It was found that due to presence of Li in B₂₄N₂₄ nanocage, a novel negative differential resistance (NDR) phenomenon is observed. Furthermore, the transmission coefficients of the Li@B₂₄N₂₄ metallofullerene at various external biases are analyzed and it indicates that the broadening of the transmission coefficient spectrum with increasing of the external biases confirms the NDR behavior at the I–V characteristic.     

The interpolating element-free Galerkin method for solving Korteweg–de Vries–Rosenau-regularized long-wave equation with error analysis

Nonlinear Dynamics - The main target of this investigation is to develop a new numerical method for solving a class of wave models, i.e., the Korteweg–de Vries–Rosenau-regularized...     

Solid phase extraction of heavy metal ions based on a novel functionalized magnetic multi-walled carbon nanotube composite with the aid of experimental design methodology

We report that magnetic multiwalled carbon nanotubes functionalized with 8-aminoquinoline can be applied to the preconcentration of Cd(II), Pb(II) and Ni(II) ions. The parameters affecting preconcentration were optimized by a Box-Behnken design through response surface methodology. Three variables (extraction time, magnetic sorbent amount, and pH value) were selected as the main factors affecting sorption, and four variables (type, volume and concentration of the eluent; elution time) were selected for optimizing elution. Following sorption and elution, the ions were quantified by FAAS. The LODs are 0.09, 0.72, and 1.0 ng mL^?1 for Cd(II), Ni(II), and Pb(II) ions, respectively. The relative standard deviations are <5.1 % for five separate batch determinations at 30 ng mL^?1 level of Cd(II), Ni(II), and Pb(II) ions. The sorption capacities (in mg g^?1) of this new sorbent are 201 for Cd(II), 150 for Pb(II), and 172 Ni(II). The composite was successfully applied to the rapid extraction of trace quantities of heavy metal ions in fish, sediment, soil, and water samples.