Materials Literature
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Using first-principles calculations, we model the chemical vapor deposition (CVD) growth of carbon nanotubes (CNT) on nanoparticles of late-transition (Ni, Pd, Pt) and coinage (Cu, Ag, Au) metals. The process is analyzed in terms of the binding of mono- and diatomic carbon species, their diffusion pathways, and the st…
The determinant influences of oxidants on the single-crystalline nature of manganese oxides (i.e., Mn 3 O 4 and MnOOH single crystals) through a low-temperature hydrothermal synthesis route from a simple aqueous solution containing 20 mM Mn(CH 3 COO) 2 ·4H 2 O at 120 °C are demonstrated in this work. The absence of ox…
Abstract The aim of this study is to evaluate the efficiency of different intumescent formulations to flame retard polylactic acid (PLA). First, the ammonium polyphosphate (APP)/pentaerythritol (PER) system is chosen because it previously demonstrated a good behavior for polyethylenic matrices. The PER is then substit…
Titanium dioxide nanoparticles (nano-TiO2) are widely used as a photocatalyst in air and water remediation. These nanoparticles are known to induce toxicity; however, their cytotoxic mechanism is not fully understood. In this study, we investigated the underlying mechanism of nano-TiO2-induced cytotoxicity in peripher…
Chromium doped zinc telluride thin films with various doping concentrations are fabricated by magnetron sputtering. These films are ferromagnetic and the Curie temperature increases with Cr concentration. X-ray diffraction, transmission electron microscopy, and magnetic circular dichroism characterizations show that t…
By means of high resolution synchrotron X-ray and neutron powder diffraction we have investigated the structural evolution of Pr 0.50 Ca 0.50 Mn 0.99 Ti 0.01 O 3 . We have found two structural transitions on cooling; the first takes place at T CO ≃ 240 K and the second in a wide temperature range around 100−140 K. Bel…
A monocrystalline diamond detector was used for measurements of soft x-ray and ion emission from laser plasma obtained with the use of the PALS Asterix laser at intensities on the order of 1016 W/cm2 and pulse duration of 300 ps. Measurements were performed by varying the laser intensity and the focal position of the…
Structural and mechanical properties of single-walled carbon nanotubes (SWCNTs) completely filled with bimetallic alloys are investigated using classic molecular dynamics method. Progresses on both synthesis and property researches of metal-filled carbon nanotubes are also comprehensively reviewed. Different initial e…
We have measured and analyzed x-ray photoelectron spectra of a series of GexAsySe1−x−y glasses. The valence band spectra show that a number of Se-rich structures exist in the samples. After decomposing Ge, As, and Se3d spectra into several doublets and assigning them to the different local bond structures, it was foun…
This study describes an electrically tunable two-dimensional (2D) liquid crystal holographic polarization grating. It is a twisted nematic grating array, which is obtained by orthogonally overlaying two crossed one-dimensional (1D) polarization holograms. A 1D polarization hologram has a rotating linear polarization p…
The photodegradation behavior of three different transparent silicone elastomers, primarily used in space, was investigated experimentally. Samples were irradiated by an artificial ultraviolet (UV) light source, whose spectrum was split into five discrete wavelength bands in the range from 200 to 400 nm. The transmitt…
Periodic mesoporous organosilicates were synthesized under basic conditions using mixtures of phenyl and biphenyl silsesquioxane precursors in the presence of octadecyltrimethylammonium chloride as structure-directing agent. In addition to the hexagonally arranged mesopores, the materials derived from mixed precursors…
The electronic properties of single-wall AlGaN2 nanotubes were investigated using first-principles calculations and generalized gradient approximation. All AlGaN2 nanotubes considered are semiconductors, but their band structures depend on their chirality and size due to curvature effect and symmetry. The zigzag AlGaN…
The x-ray diffraction patterns, transmission electron microscopy images, and selected-area electron diffraction patterns for the ZnO∕Si heterostructures annealed at 900°C showed that orthorhombic ZnSiO3 nanoparticles were formed in the amorphous layer between the ZnO film and the Si substrate, resulting from the inter…
Heat treatment of wood fibers in a closed press for 4 and 8 minutes and pressed into fiberboards greatly reduces moisture regain and increases dimensional stability of the boards. Part of the hemicellulose sugars are lost during the steam treatment and furan intermediates were detected. Mannose, galactose, xylose, ara…
The potential of using nanometallic wires inside a matrix as new generation of thermal interface material led us to study the thermal diffusivity of nickel nanowires embedded inside porous alumina template. Thermal diffusivity measurements using a laser flash method showed size dependence for nickel nanowires inside n…
Variable angle spectroscopic ellipsometry (VASE) was employed to study the optical properties of As33S67−xSex (x=0, 17, 33.5, 50, and 67at.%) bulk glasses in the UV-vis-NIR (near infrared) spectral region for photon energies from 0.54to4.13eV (photon wavelengths from 2300to300nm). For data analysis, we employed Tauc–L…
Spectroscopic investigation of Er3+ doped Sc2O3 transparent ceramics was performed in order to assess its potential as a laser material for different emission wavelengths. The Judd–Ofelt intensity parameters for the f-f transitions of the C2-symmetry center of Er3+ in Sc2O3 transparent ceramics, inferred from the room…
We present density of states and electronic transport calculations of single vacancies in carbon nanotubes. We confirm that the defect reconstructs into a pentagon and a nonagon, following the removal of a single carbon atom. This leads to the formation of a dangling bond. Finally, we demonstrate that care must be tak…
The Sr-substituted Ba2NaNb5O15 (Ba2−xSrxNaNb5O15) thin films were prepared on the La0.05Sr0.95TiO3 substrates by pulsed laser deposition. When the substrate temperature was fixed at 700°C, the thin films exhibited highly c-axis orientation and smooth surface. The c-axis orientation and surface roughness do not depend…