Materials Literature
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As a result of the steel cable security rating, it is essential to determine that the nature, value, and quantity of defects will not exceed the critical reject limits while in operation. The high-temperature impact results in uneven wire heating in the cable operation activity. It leads to the cable deflected mode ch…
We employed a scanning tunneling microscope to image the (001) surface topography and local density of states (LDOS) in La$_{2-2x}$Sr$_{1+2x}$Mn$_2$O$_7$ (x=0.32, LSMO) single crystals below the Curie temperature (T$_C$ = 120 K). The LDOS maps revealed a stripe-like modulation propagating along the tetragonal a axis w…
We report ultrafast transient-grating experiments on heavily p-type InP at 15 K. Our measurement reveals the dynamics and diffusion of photoexcited electrons and holes as a function of their density n in the range 2E16 to 6E17 cm-3. After the first few picoseconds the grating decays primarily due to ambipolar diffusio…
By adding a non-linear core correction to the well established Dual Space Gaussian type pseudopotentials for the chemical elements up to the third period, we construct improved pseudopotentials for the Perdew Burke Ernzerhof (PBE) functional and demonstrate that they exhibit excellent accuracy. Our benchmarks for the…
While freestanding clean graphene is essential for various applications, existing technologies for removing the polymer layer after transfer of graphene to the desired substrate still leave significant contaminations behind. The authors discovered a method for preparing ultraclean freestanding graphene utilizing the c…
We predict the simultaneous occurrence of two fundamental phenomena for metal nanoparticles possessing sharp corners with variable curvature: First, the main dipolar plasmonic mode experiences a strong red shift with increasing corner curvature; for large values of the curvature, the resonant frequency is controlled b…
hexagonal close packed metals based on discrete dislocation simulations Mark C Messner, Moono Rhee, Athanasios Arsenlis et al.
Magnetite (Fe3O4) nanoparticles have been prepared by oxidation-precipitation method using Monoethanolamine (MEA) as precipitation agent and by modified co-precipitation method using the mixture of isomeric-branched primary alcohol (A1416) and kerosene as stabilizing agent, respectively. X-Ray Diffraction (XRD) patter…
The voice is produced by the vibration of vocal cords which are located in the larynx. Therefore, one of the major consequences for patients subjected to laryngectomy is losing their voice. In these cases, a synthetic one-way valve set (voice prosthesis) can be implanted in order to allow restoration of speech. Most v…
The Mg–12Gd–3Y–0.6Zr (GW123, wt.%) alloy was prepared by cast, and thermo-mechanically treated by single and secondary hot extrusion techniques. The microstructure, texture and mechanical properties of the extruded alloy were investigated. The results show that in different treated conditions the microstructure is mai…
We have measured the electrical properties of a V 2 O 3 thin film micro bridge at the insulator-metal transition (IMT). Discontinuous jumps to lower voltages in the current voltage characteristic (IV) followed by an approximately constant voltage progression for high currents indicate an electrical breakdown of the de…
Zinc oxide (ZnO) hierarchical structures (HSs) have recently demonstrated notable photochemical and photovoltaic performances attributed to their nano/micro combined architectures. In this study, ZnO HSs were synthesized at room temperature using ultrarapid sonochemistry. This novel approach can effectively overcome d…
Semiconductor nanocrystal quantum dots (QDs) have been the subject of much interest for fundamental and applied studies. The synthesis of QDs has developed over the past 30 years such that production of monodisperse, photostable QDs with a near-exact size and shape are readily achievable. However, an understanding of…
The main objective of this work is the grafting of polycaprolactone diol (PCL) on the surface of oxidized nanocelluloses (ONC) in order to enhance the compatibility between the hydrophilic cellulose nanofibres and the hydrophobic polymer matrix. This grafting was successfully realized with a new strategy known as clic…
Graphene/metal nanoparticle (NP) composites have attracted great interest for various applications as catalysts, electrodes, sensors, etc., due to their unique structures and extraordinary properties. A facile synthesis of graphene/metal NP composites with good control of size and morphology of metal NPs is critical t…
The properties of neutral defects in SrTiO3 are calculated using the screened hybrid density functional of Heyd, Scuseria, and Ernzerhof. The formation energies, the crystal field splittings affecting the SrTiO3 band structure, and the relaxation geometries around each defect are discussed. Oxygen vacancies introduced…
We report our Raman studies of a new lead-free relaxor ferroelectrics, Ba 0.85 Ca 0.15 Ti 0.9 Zr 0.1 O 3 (BCTZO). The Raman modes of BCTZO are compared with those of BaTi 0.8 Zr 0.2 O 3 (BTZO), and BaTiO 3 (BTO). Also, they are compared with the eigenmodes of BTO calculated by using an abinitio quantum-mechanical froz…
We calculate the density of states (DOS) and the Mulliken population of the diamond and the co-doped diamonds with different concentrations of lithium (Li) and phosphorus (P) by the method of the density functional theory, and analyze the bonding situations of the Li-P co-doped diamond thin films and the impacts of th…
First-principles calculations show that spin-up and spin-down carriers accumulate adjacent to the opposite surfaces of a BiFeO 3 (BFO) film upon applying an external bias. The spin carriers are equal in magnitude and opposite in direction, and spin-down carriers move in the direction opposite to the external electric…
Ab-initio calculations for the structural properties of Zr-Nb alloys at different values of the niobium concentration are done at zero temperature. Different cases for Zr-Nb alloys with unit cells having BCC and HCP structures are considered. Optimal values of the lattice constants are obtained. Critical value for the…