Materials Literature
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We report on site-selective growth of multiwalled carbon nanotubes (MWNTs) from a Co nanoparticle catalyst patterned by an ink-jet printing (IJP) technique. The dispersion of the Co nanoparticles was employed as “catalyst ink” for the IJP, and the catalyst pattern was subjected to chemical vapor deposition of acetylen…
Abstract Catalysts of Co,K/La 2 O 3 have been prepared by wet impregnation. The samples have been calcined at 400°C and 700°C and have been characterized for phase composition using x‐ray diffraction and Fourier transform infrared spectroscopy. The XPS analysis of the samples has been obtained by examination of the O…
The Mg 2 Ni intermetallic compound was successfully prepared under 3.00 MPa hydrogen pressure at 553 K from magnesium and nickel ultrafine particles, which were obtained from a hydrogen plasma–metal reaction. A thermal treatment process under vacuum was used to obtain Mg 2 Ni. The nanometre-scale effect is thought to…
We have demonstrated assembly of two- and three-dimensional networks of single-walled carbon nanotubes (SWNTs) using a microsphere assembly approach. The catalyst microcapsules are made from the solution based impregnation of uniform diameter, porous polystyrene microspheres. Chemical vapor deposition on the microcaps…
Thin-film solid solutions of SmxNd1−xNiO3 were synthesized on NdGaO3 substrates by pulsed-laser deposition using alternating NdNiO3 and SmNiO3 targets. The films were characterized by x-ray diffraction and variable-temperature four-probe conductivity measurements. The films grow in the {100}pseudocubic direction. Ther…
Abstract Considerable attention has been devoted recently to the dependence of the widths of the Raman phonons of semiconductors on pressure and on isotopic mass. The dependence on pressure is usually small and monotonic unless the phonon happens to be close to a singularity of the two‐phonon density of states (DOS) w…
Abstract In this study sulphur hexafluoride (SF 6 ) plasmas and argon plasma immersion ion implantation (ArPIII) techniques have been applied to improve the hydrophobicity of poly(tetrafluoroethylene) (PTFE), polyurethane and silicone surfaces. As evaluated by water contact angle measurements, all the treatments resul…
Based on the model of lattice dynamics with force-constant matrix, we have calculated phonon spectrum and then specific heats of single-walled carbon nanotubes. The results show that with a more complicated phonon spectrum, a single-walled carbon nanotube has analogous good thermal conductivity to the two-dimensional…
The structure, resistivity, thermopower, and magnetic behaviors of two sets of samples ${\mathrm{CaMn}}_{1\ensuremath{-}x}{\mathrm{Ru}}_{x}{\mathrm{O}}_{3}$ and ${\mathrm{CaMn}}_{1\ensuremath{-}y}{\mathrm{Mo}}_{y}{\mathrm{O}}_{3}$ $(0.04<~x<~0.08;$ $0.02<~y<~0.04)$ have been studied. All samples exhibit a…
Ab initio electronic structure calculations of the ideal strength of Fe, Co, Ni, and Cr under isotropic tension were performed using the linear muffin-tin orbital method in the atomic sphere approximation. Magnetic ordering was taken into account by means of a spin-polarized calculation. Two approximations for the exc…
We examine the favored cluster structures for two new interatomic potentials, which both behave as monatomic model glass formers in bulk. We find that the oscillations in the potential lead to global minima that are noncompact arrangements of linked 13-atom icosahedra. The structural properties of the clusters correla…
BN nanotubes are coated with SnO(2) by a simple chemical reaction in solution. BN nanotubes are stirred inside a SnCl(2) solution at room temperature for 1 h. The coating is uniform with complete coverage. The coating thickness is typically 1-5 nm. The coating layer contains SnO(2) nanoparticles with sizes ranging fro…
Dynamics of supercooled ortho-terphenyl, salol, benzophenone, 2-biphenylmethanol, and dibutylphthalate have been studied using optical heterodyne detected optical Kerr effect experiments over a broad range of time, &lt;1 ps to tens of ns. On time scales longer than those influenced by intramolecular vibrational dy…
The basis set convergence of geometries, vibrational frequencies, and associated infrared intensities is investigated for density-functional methods. The recently proposed polarization consistent basis sets give an exponential convergence to the basis set limit, with each step up in quality providing an improvement of…
Reversible ligand-centered one-electron oxidation of square-planar neutral complexes of palladium(II) and platinum(II) [M(bpy)(L)] (bpy=bipyridine, L: see picture) leads to the paramagnetic complexes [M(bpy)(L.)]+. Thus, the existence of S,S-coordinated o-dithiobenzosemiquinonate(1−) π radical ions has been proven une…
A reactive solid-phase epitaxy technique was applied to fabricate all-oxide transparent p-n heterojunctions composed of p-ZnRh2O4 and n-ZnO thin layers. Polycrystalline ZnRh2O4 was deposited on a ZnO epitaxial layer at room temperature. Thermal annealing of the bilayer sample at 950 °C in air converts the polycrystall…
We report a complete set of material properties of single-domain, relaxor-based 0.67Pb(Mg1/3Nb2/3)O3–0.33PbTiO3 [PMN–33%PT] single crystals. Because the single-domain state is unstable in natural conditions, a bias electric field of 0.2 MV/m was applied along the dipole direction of the rhombohedral phase during the m…
Physical constraint and capillary force have been combined to provide a generic approach to assemble achiral building blocks such as monodisperse spherical colloids into helical mesostructures. The key component of this process is an array of V-shaped grooves anisotropically etched in the surface of a Si(100) wafer. T…
The deposition, characterization, and electrochemical responsiveness of boron-doped nanocrystalline diamond thin-film electrodes is reported. The films consist of clusters of diamond grains, ∼50−100 nm in diameter, and possess an rms surface roughness of 34 nm over a 5 × 5 μm 2 area. The individual and randomly ordere…
Monte Carlo simulations, supplemented by ab initio calculations, shed light onto the energetics and thermodynamic stability of nanostructured amorphous carbon. The interaction of the embedded nanocrystals with the host amorphous matrix is shown to determine in a large degree the stability and the relative energy diffe…