Materials Literature
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The polyurethane prepolymer was synthesized, and hydrophilic nano-sized silica (A200) was added to the prepolymer with KH550 as a coupling agent, then a waterborne polyurethane/nanosilica hybrid material (WPUNS) was obtained by a sol-gel process. The structure and performance of the WPUNS films were studied by FTIR, T…
The dynamics of cephalosporins controlled release from a new hybrid inorganic/organic nanomaterial was investigated. Magnetic Fe3O4 nanoparticles were synthesized using the sol-gel method, while a hybrid nanostructured Fe3O4/oleic acid – core/shell – material was prepared under microwave conditions and further charact…
A selective preparation and the formation mechanism of hexagonal and cubic CoO nanoparticles from the reaction of [Co(acac)(2)] (acac=acetylacetonate) and amine have been investigated. CoO nanoparticles with a hexagonal pyramidal shape were yielded under decomposition conditions with amine. Importantly, the addition o…
Polarized Raman spectroscopy has been employed to investigate the evolution of the microstructure of 0.67PbMg1/3Nb2/3O3-0.33PbTiO3 (PMN-33%PT) single crystal in the temperature range from −195 to 300 °C. The MA-MC-cubic transition sequence was observed in the microareas with MA-type (space group Cm) and MC-type (space…
This study examined the local structural properties of CuI at low temperatures of 10-300 K by x-ray diffraction (XRD) and extended x-ray absorption fine structure (EXAFS) measurements at the Cu K edge. The XRD data were refined using two models, split (distorted zinc-blende structure) and non-split (zinc-blende struct…
We performed optical spectroscopy measurement on a single crystal of CeTe${}_{3}$, a rare-earth-element tri-telluride charge-density-wave (CDW) compound. The optical spectra are found to display very strong temperature dependence. In addition to a large and pronounced CDW energy gap that is already present at room tem…
In a previous study, the behavior of single crystal tantalum under ramp wave loading along the [100] and [110] orientations was characterized. The principal objective of the present study is to gain some insights on the observed single crystal behavior particularly on its precursor response and strong orientation depe…
This paper presents calculations of a new formulation of the three‐dimensional Kirchhoff approximation which allows calculation of the scattering of vector waves from two-dimensional (2D) metal and dielectric rough surfaces containing infinite slopes. Results are presented for scattering from metal surfaces with recta…
We present a Monte Carlo study of the effects of elastic anisotropy on the textures of nematic films with specific random hybrid boundary conditions. The polarized microscopy images and their evolution are analyzed in uniaxial systems for different values of the elastic constants.
Several advances in materials research have been made due to the wide array of tools currently available for the processing of materials: plasmas, electron beams, ion beams and lasers. The area of material science is fortunate to have seen the development of these tools over the years, be it for new bulk materials, co…
Films fabricated using the glancing angle deposition technique are subject to significant variations in several important film parameters across a sample due to geometric conditions that are not uniform across the substrate. This paper presents a method to quantify the non-uniformities in these quantities, starting fr…
Low-temperature thermoelectric properties are reported for polycrystalline samples of chalcogenide spinel CuyFe4Sn12X32 (X = S, Se; y = 8.0 to 4.0). For all samples with X = S, the electrical resistivity ρ behaves similarly to that of a doped semiconductor at high temperatures and shows a variable-range-hopping-type (…
Jute fabrics-reinforced polymer composites were prepared with different formulations using oligomer (M-1200), methanol and benzoyl peroxide. Fiber content in the composites was optimized and 55% jute content at oligomer: methanol: benzyl peroxide = 75:24.5:0.5 (w/w) ratios showed better mechanical properties. Jute fab…
The thermoelectric application of Bi2Te3 and Sb2Te3 thin film structures relies on the relative alignment of the valence band maxima for good electrical conduction. In order to determine the valence band maxima of the bulk films, the authors propose a simple repeatable treatment of a chemical etching in dilute hydroch…
Calcium alginate fibers were prepared from sodium alginate by extruding aqueous sodium alginate solution (4% by weight) into a calcium chloride (2% by weight) bath. Water uptake and mechanical properties of the calcium alginate fiber were investigated. Water uptake tests of calcium alginate showed that it absorbed 50%…
The capacitance–dc voltage relation has been investigated in the giant dielectric constant material CaCu3Ti4O12. A capacitance drop, rise and even maxima, minima have been found with increasing dc voltage, which could not simply be explained by the back-to-back Schottky barrier theory. A trap charges repositioning bet…
A general method for mapping the equipotential profile surrounding a conductive cylindrically symmetric high aspect ratio structure, such as a carbon nanotube or a Spindt tip, is devised. The surface of the object is replaced by a discrete set of charges located on the symmetry axis. The overall electrostatic potentia…
Multiferroic BiFeO3 (BFO) with the rhombohedral R3c symmetry is characterized by a clockwise-counterclockwise tilting (theta) of the FeO6 octahedron unit along the threefold pseudo-cubic [111](c) direction. A phase transition associated with the disappearance of theta is conceivable at a high temperature as thermal en…
Abstract An investigation on electronic and elastic properties of the ordered Si 0.5 Ge 0.5 alloy under high pressure has been conducted using first‐principles calculations based on density functional theory (DFT) with the plane wave basis set as implemented in the CASTEP code. Our results demonstrate that the sequenc…
We have performed angle-resolved photoemission spectroscopy of layered cobalt oxide Na x CoO 2 for a wide doping range (0.35⩽ x ⩽0.85) with synchrotron radiation, and determined the doping dependence of the Fermi surface and band structure. The two-dimensional (2D) cylindrical a 1g Fermi surface at x =0.35 gradually i…