Papers – Page 926 – TechConnect Briefs

Molecular Dynamics Simulation of Timescale Effect and Lattice Transformation of Copper Nanorod Under Bending

Wu H.A., Wang X.X., Liu G.R., National University of Singapore, SG

Mechanical behaviors of materials and structures at nanoscale are essentially different from those at macroscale, resulting from surface effect, size effect and time scale effect. In some experimental research at nanoscale, the bending displacement of [...]

Preparation and Microstructural Characterization of Pt-Pd Bimetallic Catalysts Supported on TiO2

Castillo N., García Serrano L.A., Flores Sandoval C.A., Pérez R., UNAM, MX

Nanoparticles, specially metallic nanoparticles finely dispersed onto high surface area supports, play an important role in heterogeneous catalysis because the performance of a supported metal catalyst can be related to design, which is most crucial [...]

Atomistic Modeling on Structures of Ultrathin Copper Nanotubes

Kang J-W, Hwang H-J., Computational Semiconductor Laboratory, KR

We have performed atomistic simulations for helical multi-shell (HMS) Cu nanowires and nanotubes. Our investigation on HMS Cu nanowires and nanotubes has revealed some physical properties that were not dealt in previous works that considered [...]

Polydisperse Mixture of Gold Nano-Particles

Vicuña E., Viera O., Briano J.G., Castro M., Irizarry R., University of Puerto Rico, US

Colloids synthesized in water media, usually from direct reduction of a salt, always exhibit a size distribution, which may be characterized by TEM or SEM measurements. These are in essence polydisperse systems with a dispersion [...]

Melting of Ultrathin Copper Nanobridges

Kang J-W, Hwang H-J., Chung-Ang University, KR

The previous studies on nanoclusters and infinite nanowires have shown the physical phenomena related to only the melting of nanoclusters and nanowires. This study showed the various physical phenomena of ultrathin nanobridges, such as the [...]

The Electronic Properties and L3 XANES of Au and Nano-Au

Yiu Y.M., Zhang P., Sham T.K., University of Western Ontario, CA

The electronic properties of Au crystal and nano Au have been investigated by theory and experiment. Molecularly capped nano-Au was synthesized using the two-phase method. Au nano-particles have been characterized by X-Ray Diffraction (XRD) and [...]

Effect of impurities in the breaking of Gold nanowires

da Silva A.J.R., da Silva E.Z., Novaes F.D., da Silva A.J.R., da Silva E.Z., Fazzio A., Universidade de Sao Paulo, BR

Surprisingly large interatomic distances, in the range of 3.6-4.0 Å, have been reported for one atom thick gold nanowires by various experimental groups. From a theoretical viewpoint, no one has been able to reproduce the [...]

Young Modulus Measurement of Nanostructured Palladium Thin Films

Vaz A.R., Salvadori M.C., Cattani M., Institute of Physics of the University of Sao Paulo, BR

Young moduli (E2) of nanostructured metallic thin films are determined by measuring the resonance frequencies of AFM cantilevers. The cantilevers have been uniformly coated with metallic films. The E2 is determined using the vibrating beam [...]

Computing Enthalpy-Entropy Interplay for Isomeric Fullerenes: C94 IPR Set

Zhao X., Slanina Z., Goto H., Osawa E., Toyohashi University of Technology, JP

The complete set of 134 isolated-pentagon-rule (IPR) isomers of C94 has been studied by the SAM1, PM3, AM1, and MNDO quantum-chemical methods, MM3 force field method, ab initio HF/4-31G SCF calculation and density functional theory [...]

Sidewall Functionalization of Single-Walled Carbon Nanotubes through C-N Bond Forming Substitution Reactions of Fluoronanotubes

Stevens J., Kini V.U., Huang A., Chiang I.W., Derrien G.A., Khabashesku V.N., Margrave J.L., Rice University, US

Because of the high reactivity of C-F bonds on the sidewalls of single-wall carbon nanotubes, fluorinated SWNTs (fluoronanotubes) can be used as precursors for further derivatization. One such reaction is to replace the fluorine with [...]