Materials Literature
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Nanostructured ferroelectrics are important objects for studies on ferroelectric size effects as well as for applications to memory devices with ultra-high memory density. In the present article, we introduce several approaches for the synthesis of confined ferroelectrics with sizes in and below the hundreds of nanome…
Abstract The inhibition action of a nonionic surfactant of tween‐80 on the corrosion of cold rolled steel (CRS) in sulfuric acid (H 2 SO 4 ) has been investigated by weight loss and potentiodynamic polarization methods. Atomic force microscope (AFM) provided the CRS surface conditions. The results show that tween‐80 i…
The effects of N vacancies on the transition metal (Cr, Mn, Fe, Co, Ni, and Cu) doped GaN have been studied at the levels of the local spin density approximation (LSDA) and LSDA+U (Coulomb interaction). Our calculations show that the N vacancy favorably exists near a transition metal ion and the interaction between tr…
The thermal buckling of an armchair double-walled carbon nanotube (DWCNT), which is subjected to axial compression due to temperature rise, is derived and analyzed based on Timoshenko beam model, including transverse shear deformation and rotary inertia. According to the analysis, the effect of van der Waals force bet…
Phonon thermal conductivity of nanowires is very different from bulk materials and is of great importance to the applications of nanowires in nanoelectronics, sensors, and energy conversion and storage. Past theoretical studies usually assume that nanowires are perfectly straight and so as the analysis of experimental…
An algorithm is described which simulates a data set obtained from a protein crystal using the rotation method. The diffraction pattern of an ideal crystal is specified by the orientation of the crystal's cell axes with respect to a specified laboratory coordinate system, the distance between the crystal and the detec…
Abstract Melt‐blown webs from ester and ether thermoplastic polyurethanes and polyether‐block‐amide (PEBA) elastomers were produced at different die‐to‐collector distances (DCD) to study the correlation between the polymer type and hardness, melt‐blowing process conditions, and web properties. An experimental set up w…
Easy breakage to open-shells: The diamagnetic butterfly-like dichalcogen complexes 1 (E = Se) and 2 (E = Te) with a {Ni(II)(2)E(2)} core, undergo facile dissociation in solution via spin crossover to give the unprecedented mononuclear paramagnetic superselenide and supertelluride species 1' and 2', respectively, along…
Temperature-dependent photoluminescence of MgZnO alloy film has been studied, and it is found that the emission intensity increases significantly at a certain temperature range and then decreases when increasing temperature further. The anomalous increase is resulted from the localized excitons in MgZnO alloy, as reve…
Suspended graphene layers were prepared by a micromechanical cleavage method. Adhesive layer was pasted on the surface of meshed Cu TEM grid followed by stamping of natural graphite (NG) and highly ordered pyrolytic graphite (HOPG) on the grid. HRTEM and diffraction pattern analyses were carried out in order to identi…
In this work, coated metallic cylinders transparent to electromagnetic waves are designed based on the neutral inclusion method; they are then verified experimentally by measuring the reflection coefficient and total scattering fields. The dynamic effective permittivity of a composite made of coated metallic cylinders…
We will present recent development of graphene FET technology on a wafer scale, including epitaxial graphene growth, device fabrication and characterization. The epitaxial growth of graphene on 2-inch wafers were fabricated via graphitization of Siface SiC(0001) substrates. The sheet electron carrier density of these…
Spatially inhomogeneous distributions of current density and temperature in solid oxide fuel cells (SOFC) can contribute significantly to electrode degradation, thermomechanical stresses, and reduced efficiency. A combined experimental and modeling study of the spatial distribution of electrochemistry was performed in…
The high-pressure behavior of zinc oxide (ZnO) nanotube has been investigated to 38.7 GPa by in situ synchrotron x-ray diffraction in a diamond anvil cell at room temperature. The transformation from the hexagonal wurtzite (B4) to the cubic rocksalt (B1) phase started at 10.5 GPa and completed at 18.4 GPa. The initial…
We present a facile route to deposit a uniform Al2O3 layer on a highly oriented pyrolytic graphite (HOPG) surface using atomic layer deposition (ALD). Al2O3 layers deposited from TMA (trimethylaluminum)/ H2O chemistry showed selective deposition only on step edges. However, TMA/O3 chemistry resulted in the deposition…
Spherical gold (Au) nanoparticles are formed onto glass surface by sputtering of Au foil and the following annealing process. By employing electric field assisted annealing of above as-prepared samples, the original spherical Au nanoparticles are dissolved to lunar-eclipselike structure and even fully dissolved. When…
Abstract An investigation of the properties of the blends of nylon 6 (PA6) and poly(vinyl alcohol) (PVA) with varying degrees of hydrolysis was conducted. A near disappearance of the characteristics of the α‐form PVA crystals, crystallization exotherms, and hydrogen‐bonded hydroxyl groups and the tensile properties or…
Abstract Starch based thermoplastic composites reinforced by short sisal fibers having length less than 1 mm were fabricated by extrusion followed by compression molding. The sisal fiber content varied from 0 to 10% w/w keeping the amount of glycerol (plasticizer) as constant (23% w/w). Investigation proved that an in…
The dynamics and pathways for excited-state energy transfer in three dyads and five triads composed of combinations of zinc, magnesium, and free base porphyrins (denoted Zn, Mg, Fb) connected by p-phenylene linkers have been investigated. The processes in the triads include energy transfer between adjacent nonequivale…
The development and analysis of electrical and electromagnetic interference shielding effectiveness of titanium carbide (TiC)-coated carbon nanofiber (CNF) reinforced liquid crystalline polymer composites are presented. The studied samples consisted of different weight percentages (5, 10, and 15 wt %) of CNFs distribu…