Materials Literature
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Abstract This article reports the crystal growth behavior of biodegradable polylactide (PLA)/poly[(butylene succinate)‐co‐adipate] (PBSA) blend thin films using atomic force microscopy (AFM). Currently, polymer thin films have received increased research attention due to their important role in a variety of technologi…
Mode-selective phonon excitation by a mid-infrared laser (MIR-FEL) is demonstrated via anti-Stokes Raman scattering measurements of 6H-silicon carbide (SiC). Irradiation of SiC with MIR-FEL and a Nd-YAG laser at 14 K produced a peak where the Raman shift corresponds to a photon energy of 119 meV (10.4 μm). This phenom…
The aim of this study was to prepare polyvinyl borate (PVB)/poly(methyl methacrylate) (PMMA) blend nanofibers by electrospinning process. Polyvinyl borate was synthesized by the condensation reaction of polyvinyl alcohol and boric acid. FTIR analyses showed that boron atoms were found to be integrated into the polymer…
A simple process is developed to curl graphene membranes through thermal annealing. The resulting curled graphene ribbons displayed enhanced photocurrent response compared to flat graphene ribbons. The annealing temperature, the thickness of the graphene, and the type of poly-methyl methacrylate used were the three ke…
ZnO films were deposited by a novel aqueous solution process named the spin-spray method and thermally treated at different temperatures from 100 to 300 °C. All films had a high transmittance of 80% in the visible range and exhibited conductivity after UV illumination for 24 h. The dependence of thermal treatment temp…
In the present study, a nonlocal hyperbolic shear deformation theory is developed for the static flexure, buckling and free vibration analysis of nanobeams using the nonlocal differential constitutive relations of Eringen. The theory, which does not require shear correction factor, accounts for both small scale effect…
Previous work has shown that nanoscale lamellar inorganic–organic hybrid materials can be synthesized on transparent conductive substrates via the electrodeposition of Zn(OH) 2 in the presence of conjugated surfactants. These surfactants introduce p -type semiconducting supramolecular phases; thus, following conversio…
The planktonic diatom Fragilariopsis kerguelensis plays an important role in the biogeochemical cycles of the Southern Ocean, where remains of its frustules form the largest deposit of biogenic silica anywhere in the world. We assessed the genetic identity of 26 strains, from cells collected at various sites in the So…
The nature of the bonding in Ag(n)S(m)(0∕-) clusters, n = 1-7; m = 1-4, has been analyzed to understand its effect on the electronic shell structure of silver clusters. First-principle investigations reveal that the sulfur atoms prefer 2 or 3-coordinate sites around a silver core, and that the addition of sulfur makes…
Extended X-ray absorption fine structure (EXAFS) has been measured at both the K edges of gallium and arsenic in GaAs, from 14 to 300 K, to investigate the local vibrational and thermodynamic behaviour in terms of bond expansion, parallel, and perpendicular mean square relative displacements and third cumulant. The se…
The interfaces of multilayered CVD diamond films grown by the hot-filament technique were characterized with high detail using HRTEM, STEM-EDX, and EELS. The results show that at the transition from micro- (MCD) to nanocrystalline diamond (NCD), a thin precursor graphitic film is formed, irrespectively of the NCD gas…
We demonstrate via the numerical simulation the modulation of the transmission of visible and near-infrared light through a hybrid grating structure containing a gold metallic wire-grid grating patterned on a thermochromic vanadium dioxide (VO2) thin film. We find that the transmission through the subwavelength slits…
Based on the polarization-sensitive absorption effect, we have proposed a method to accurately count the number of carbon atomic layers for both exfoliated and chemical vapor deposition graphene sheets on transparent substrate. With spatial scanning, the three-dimensional imaging of graphene sample can be achieved to…
Magnetic properties and magnetocaloric effect (MCE) of the HoCuAl compound is investigated. The compound is found to be ferromagnetic and undergoes a second-order phase transition from ferromagnetic (FM)-to-paramagnetic (PM) state around Curie temperature TC = 11.2 K. A giant MCE is observed and no magnetic hysteresis…
Spark plasma sintering ( SPS ) is a high current, low voltage process. Nevertheless, the system voltage (3–10 V) can be large enough to produce significant fields across a thin, insulating sample. A lumped circuit model is analyzed to estimate the magnitude of this field in terms of the die geometry. Normalizing the s…
The work described herein employs neutral alumina as an effective catalyst for ring opening of triarylpyrylium perchlorates to corresponding aromatic cyanodienones, which have main roles in biological activities. The present porous catalyst has several advantages, it is inexpensive, thermally and mechanically stable,…
This paper presents an optical element capable of multiplexing two diffraction patterns for two orthogonal linear polarizations, based on the use of non-resonant metamaterial cross elements. The metamaterial cross elements provide unique building blocks for engineering arbitrary birefringence. As a proof-of-concept de…
A novel incorporation of polyoxometalate (POM) into Cu2O photocathodes was achieved by electrostatic adsorption of polyoxometalate on Cu2O crystal faces, so that the Cu2O/POM composite films exhibit significant photovoltaic enhancement because the POM could act as electron-acceptor to retard the electron–hole recombin…
We use the tight-binding method to study spin-dependent exciton effects in zigzag-edged graphene nanoribbons (ZGNRs). Our results show the three spin-triplet excitons are not degenerate in energy due to different charge distributions: Electrons and holes are distributed on the opposite edges of ZGNRs for the triplets…
Combining mesoscale distinct element method simulations with analytical modeling, we predict the ability of individual single-wall carbon nanotubes to form stable ring windings with multiple turns, in spite of their remarkable stiffness. The stability of these structures arises from the energy balance between the bend…