Materials Literature
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Abstract The synthesis of nonmagnetic/magnetic PbS/EuS core/shell nanocrystals (NCs) has been demonstrated. PbS NCs were deposited by EuS layer via thermal decomposition of the single-source precursor, Eu(III)–dithiocarbamate complex, giving PbS/EuS core/shell NCs.
A novel red-emitting NaSrPO4:Eu3+ phosphor was prepared by a conventional solid-state reaction. The luminescence properties and temperature dependence of 4:Eu3+ were investigated. The phosphor exhibited red luminescence under the near-UV excitation of 395 nm, corresponding to the 5F0→7L6 transition of Eu3+ ions, which…
The low-frequency quadratic electro-optical effect with a maximum electro-optical coefficient of g = 8 × 10 −19 m 2 /V 2 (i.e., four orders of magnitude greater than the standard high-frequency value) has been studied in thin films of ferroelectric polymer PVDF(70%)-TrFE(30%). The observed effect is related to the pro…
The dynamical properties of a new perovskite GeTiO3 materials have been investigated by using first principle calculation based on Density Functional Theory (DFT) within the gradient generalized approximation (GGA). All calculations were performed using the Cambridge Serial Total Energy Package (CASTEP) computer code.…
The structure of X-ray photoelectron spectra of actinide-containing (An = Th, U, Np, and Pu) murataite ceramic (Ti-Mn-Ca-An-Zr-Al-Fe-O) samples as potential matrices for immobilization of actinide radioactive waste was studied. The elemental composition of the sample surface was analyzed, and comparison with the calcu…
The generation mechanism of positive charge present in germanium oxide film thermally grown on a germanium substrate has been investigated in this study. Water-related hole traps are generated in the interfacial germanium suboxide layer. The negative flat-band voltage shift due to the charged hole traps increases with…
This paper considers the use of Holographic Optical Elements (HOEs) to shape the weld beam and hence control the grain size of the weld bead and the grain growth and phase transformations in the HAZ. Welds have been produced on carbon steel with the introduction of a nickel based filler powder, using different energy…
A new thermal hydrolysis technique is proposed for synthesis of complex oxide ferrite spinels with the general formula MFe 2 O 4 , where M = Ni, Co, Cu, Mn, Zn, etc. The structural, morphological, and magnetic properties of powdered nickel ferrite NiFe 2 O 4 obtained by the proposed technique are investigated.
A class of materials is considered that possesses local orthotropic symmetries. Constitutive models with microstructural evolution are developed within a conventional elastic–plastic multiplicative decomposition. In the current configuration, the orthotropic vectors evolve with the microstructural spin, which is the d…
In the present study, squeeze cast A356 matrix composites reinforced with coated B4C particles were fabricated. Attempts were made to coat the B4C powders with TiB2 via a sol–gel process and incorporate them into the A356 alloy by a mechanical stirrer. The hardness of B4C particle is the third highest among all materi…
Transparent oxide glass is the ideal luminescent host materials used in luminescence, optical communication, fiber optic amplifiers and other areas in the future as its stable physical and chemical properties, high rare-earth ion solubility and easy forming, etc. In this paper, SiO2-TiO2-SrO-SrF2-Sm2O3 glasses with di…
In anisotropic PbSb2Te4 and PbSb2Te4:Cu single crystals, nine main independent components of the Hall, electrical-conductivity, thermopower, and Nernst-Ettingshausen effects and their anisotropy in the range 77–450 K have been studied. PbSb2Te4 single crystals exhibit a high hole concentration (p ≈ 3 × 1020 cm−3). Cop…
We investigate porous low-k SiCOH under dynamic voltage stress to provide new insights into electrical breakdown. Our results are consistent with the existence of two breakdown mechanisms: the first is independent of trench barrier material and other processing details and is identical for DC, unipolar and high freque…
The objective of this study was to investigate the effects of the process variables (transmembrane pressure, flow rate, and concentration) on the permeate flux during the microfiltration of model starch suspensions, and to determine the conditions under which the use of Kenics statics mixer as a turbulence promoter is…
Surface morphologies of Ge islands deposited on Si(100) substrates are characterized and their optical properties determined. Samples are prepared by rf magnetron sputtering in a high-vacuum chamber and are annealed at 600°C, 700°C and 800°C for 2 min at nitrogen ambient pressure. Atomic force microscopy, field emissi…
Nanofibers are currently used in modern medicine. Various materials including biodegradable, non-degradable, and natural materials have been used to produce the novel nanofibers. Electrospinning technique enables the creation of continuous fibers with dimensions on the scale of nanometers from a wide range of natural…
Ginkgo leaf tea has been used as a reducing agent for gold nanoparticles and nanoplatelets. Synthesis is performed via direct heating and microwave heating. Anisotropic nanoplatelet formation is diminished in favor of isotropic nanoparticle formation as the reaction temperature is increased via direct heating. When mi…
Epoxy-based adhesives are used as thermal and electrical interfaces. These interfaces require excellent adhesion, heat transfer, and electrical properties. Due to the difference in material properties, adhesive failure and delamination remain an integral part of the reliability issue since adhesive rupture or delamina…
Abstract Fe3O4 nanoparticles (NPs) were prepared by the co‐precipitation of Fe3+ and Fe2+ with ammonium hydroxide, and were modified by four different surfactants. The modified Fe3O4 NPs were characterized by Fourier transform infrared spectroscopy, X‐ray powder diffraction, transmission electron microscopy and vibrat…
ZnO thin films were spin-coated on Pt substrats (Pt/Ti/SiO 2 /Si) by using a sol-gel process and were characterized as a function of sintering temperature. The films were annealed at 600, 650, 700, and 750 °C to find the optimum annealing temperature in air. The crystalline structure, stress, and c-axis lattice consta…