Materials Literature
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The authors predict a superhard semiconductor phase of Be3N2 with cubic structure using first-principles calculations. The structural, mechanical, electronic, and optical properties of the Be3N2 have been investigated. Results indicate that the predicted Be3N2 phase is a wide gap semiconductor with a direct band gap o…
The nanometer-scale thickness and energy of twin boundaries govern the martensitic twin structure and its dynamics, which are responsible for the actuation and superelasticity of shape memory alloys. In this letter the authors apply a method, which has been recently developed for investigating twin wall structures in…
A major unresolved problem of density functional theory is the yet unknown exchange-correlation functional, which leads to a proliferation of its less or more successful approximations. A practical implementation of these numerous functionals can present a substantial challenge particularly if the higher order functio…
The transport property of the manganite heterojunction La0.9Ca0.1MnO3+δ∕SrTiO3 (doped by 1wt%Nb) has been experimentally studied. The most important results of the present work are the discovery of the charge tunneling-dominated transport process, characterized by the appearance of the rectifying behaviors fairly desc…
The electronic and bonding properties of nitrogenated carbon nanotubes (N-CNTs) exposed to chlorine plasma were investigated using C and N K-edge x-ray absorption near-edge structure (XANES) and scanning photoelectron microscopy (SPEM). The C and N K-edge XANES spectra of chlorine-treated N-CNTs consistently reveal th…
The structural evolution of epitaxial monodomain (only 180° domains) ferroelectric PbTiO3 thin film has been investigated, using high-resolution, temperature-dependent, x-ray diffraction. The full set of lattice parameters was obtained from room temperature up to 850K. It allowed the calculation of the different strai…
Abstract We study the effect of Ar + irradiation on the intermediate frequency modes (IFM) in Raman spectra of single‐wall carbon nanotubes. We observe new features in the intermediate frequency region from 386 to 635 cm –1 as the defect concentration increases, whereas at the same time there is a decrease of other IF…
Abstract The determination of distillation boundaries for four‐component mixtures that exhibit azeotropy is studied. It is shown that these distillation boundaries correspond to local maxima in surface areas under conditions of Levi‐Civita parallelism. An extension of the optimization methodology given in Lucia and Ta…
The quantum conductance of zigzag metallic carbon nanotubes with double defects is investigated using tight-binding Green's function method. Two typical types of defects, the Stone-Wales defects and monovacancies, are considered. The transport behaviors are shown to depend on the defect configurations and the chiralit…
The ultrafast carrier dynamics in thin nanocrystalline silicon films (10 and 20nm thick) on quartz over a broad spectral range using optical pumping at a moderate fluence of 2.5mJ∕cm2 were studied. The films were composed of randomly oriented silicon nanocrystals of various sizes and shapes. The authors probed a fast…
The Ge1−xMnx thin films were fabricated at x=0.25, of which the composition is close to Ge3Mn. They showed ferromagnetism up to above 350K, even though their structure is amorphous. Ge3Mn amorphous samples grown at 200°C have n-type characteristics, while those grown at 500°C have p-type characteristics. The former ha…
The temperature and bias voltage dependent electrical transport properties of in situ fabricated Cu-tetracyanoquinodimethane organic nanowire devices are investigated. The low bias conductance and current exhibit a power-law dependence on temperature and bias voltage, respectively. The overall behavior of these nanowi…
We demonstrate that the thermal conductance K of individual multiwall carbon nanotubes can be controllably and reversibly adjusted by sliding the outer shells of the tube with respect to the inner core in a telescopinglike manner. K shows an exponential dependence on the telescoping distance. Tunable nanoscale thermal…
This study investigates temperature and current density distribution in a planar solid oxide fuel cell unit with cross-flow configuration when fuel and air inlet flows are nonuniform. The numerical method in this study solves two-dimensional, simultaneous, partial differential equations of mass, energy, and electroche…
O K- and Zn and Au L3-edge x-ray absorption near-edge structure (XANES), x-ray emission spectroscopy (XES), and scanning photoelectron microscopy (SPEM) are performed to investigate the electronic structure of ZnO nanorods with nanocrystalline (nc)-Au particles grown on the surfaces. The XANES spectra of nc-Au∕ZnO nan…
A method for soldering carbon nanotubes lying on microfabricated metal pads is presented. By employing the fountain-pen principle, the authors deposited a gold nanoparticle suspension (nanoink) film on the area where the carbon nanotube contacts the metal pad. The nanoink was deposited by using a capillary tube that w…
The authors report a facile method for the fabrication of a superhydrophobic surface with spiral Co3O4 nanorod arrays on a glass wafer plated Au. The resulting surface shows superhydrophobicity with a static contact angle of about (162±1.6)° and a sliding angle of around (5±2)°. This functionalized, nanostructured sur…
A computer-generated hologram (CGH) designed using the iterative Fourier transform algorithm was recorded in a cell filled with a polymer-dispersed liquid crystal material under a collimated He–Ne laser beam operating at 543nm. Due to the photopolymerization induced phase separation, an index modulation was formed bet…
We report measurements of the nonlinear micromechanics of strongly flocculated model colloidal aggregates. Linear aggregates directly assembled using laser tweezers are subjected to bending loads until a critical bending moment is reached, which is identified by a stictionlike rearrangement of a single colloidal bond.…
This letter presents the in-plane poling in electro-optic (EO) polymer modulators with conductivity dependency of core and claddings eliminated. A Mach-Zehnder (MZ) modulator with a highly conductive EO polymer, AJLS102/APC, is realized and poled by the in-plane coplanar waveguide poling electrode. Vπ of 7.7V in a sin…