Materials Literature
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Formation mechanisms and expansion dynamics of silicon-carbon mixed cluster ions (SinCm+) in a laser-produced plasma plume produced by laser (λ=1064 nm) ablation of a SiC target in high vacuum were investigated by time-of-flight quadrupole mass spectrometry. Space- and time-resolved laser-plume interaction was examine…
Abstract Summary: A novel photosensitive fluorinated poly(arylene ether) containing chalcone units was synthesized from decafluorinated chalcone and fluorinated bisphenol at low temperature. Upon UV irradiation, the refractive indices of the polymer film were decreased because of the reduction of electronic polarizabi…
A major reason for the departure of core level X-ray photoelectron spectra (XPS) of transition metal cations in oxides from the predictions of atomic models is shown to arise from ligand field splittings in the initial state of photoemission. This splitting often leads to a change in the spatial degeneracy of the init…
We report accurate tuning of spectral peaks built up upon guiding of broadband light by annealed Si-rich silica layers with varying optical thickness. The optical wedges are characterized with various methods (photoluminescence, Raman spectroscopy, visible absorption, and x-ray photoelectron spectroscopy) showing that…
An open question to the community about the general consensus on the field-emission mechanism in carbon-based materials led to this study. By applying the Fowler–Nordheim (FN) model for carbon-based films, despite the fact that the microstructure and the resulting physical properties of the films can be tuned by scann…
In situ AFM investigation of growth on the [100] face of KH2PO4 in the presence of Al(III) and other trivalent metals reveals the emergence of a new type of morphological feature-the superstep. Supersteps, or step bunches consisting of 50-1500 elementary steps, are responsible for growth at all supersaturations and ex…
Longitudinal sound velocity of tetragonal hen-egg-white (HEW) lysozyme crystals was measured during air drying by ultrasonic pulseecho method. The sound velocity increases with exposure to open air and approaches a constant value. The maximum value is approximately 2900 m/s that is about 1.6 times as much as that of o…
Gold nanoclusters dispersed in TiO2(110) single crystal have been formed by 2 MeV Au2+ implantation to an ion fluence of 6.0×1016 cm−2 at 300 and 975 K followed by annealing at 1275 K for 10 h. The morphological features, size, crystallographic orientation of the Au nanoclusters with respect to the TiO2 matrix, and th…
The development of protein coating on 3D biodegradable scaffold based on electrostatic self-assembly (ESA) to promote osteoblast growth is reported. Poly (ethylenimine) (PEI) was employed to obtain a stable positively charged surface on poly(DL-lactide) (PDL-LA) substrate. An extracellular-matrix (ECM)-like biomacromo…
Co−Pb nanowire arrays with an average diameter of 20 nm and lengths up to several micrometers were grown in ordered anodic alumina templates using AC electrodeposition. The as-deposited samples were annealed at different temperatures. The structure and magnetic properties of Co−Pb nanowires were analyzed by X-ray diff…
Significant current interest exists in the catalytic growth of carbon (C) nanotubes on clusters of transition metal catalysts. Here we focus on the elemental energetics for the atomistic rate processes involved in the initial stages of the growth by studying a C atom on a nickel (Ni) magic cluster $({\mathrm{Ni}}_{38}…
A synthetic strategy for preparing artificial photosynthetic antenna−reaction center complexes based on formation of a benzene core via a Diels−Alder reaction has been applied to the preparation of a zinc porphyrin (P Zn )−free base porphyrin (P 2H )−fullerene (C 60 ) molecular triad. Spectroscopic studies in 2-methyl…
Nonlinear elastic properties and elastic instability of single-walled carbon nanotubes (SWNTs) under large-scale axial compression were investigated by molecular simulations using the second-generation Brenner potential. It was found that the energy changes of the nanotube can be closely fitted by a cubic function of…
Temperature-dependent photoluminescence (PL) of ZnO layers grown on 6H-SiC substrates has been described. The PL spectra were dominated by free exciton (FX) emission throughout the whole temperature range, which reflects shallow nonradiative centers in high crystalline ZnO layers. The temperature-dependent exciton pea…
We have measured the optical reflectivity $R(\ensuremath{\omega})$ of the quasi-one-dimensional conductor ${\mathrm{NbSe}}_{3}$ from the far infrared up to the ultraviolet between 10 and 300 K using light polarized along and normal to the chain axis. We find a depletion of the optical conductivity with decreasing temp…
Raw single-walled carbon nanotubes produced by arc discharge were first treated with K 2 S 2 O 8 in dilute H 2 SO 4 solution to generate oxygenated functional groups such as carboxyl, hydroxyl, and carbonyl on varying carbon components. Further functionalization with octadecylamine was carried out via a condensation r…
Abstract In this paper, the tensile deformation and fracture toughness of high‐density polyethylene (HDPE)/ethylene vinyl acetate (EVA) blends, obtained by dynamic packing injection moulding, have been comprehensively investigated in different directions of rectangle samples, including longitudinal, latitudinal and ob…
The magnetic structures of ${}^{153}{\mathrm{EuMn}}_{2}{\mathrm{Ge}}_{2}$ and ${}^{153}{\mathrm{EuMn}}_{2}{\mathrm{Si}}_{2}$ have been determined by neutron diffraction measurements (\ensuremath{\sim}1.8--723 K). The Mn sublattices of both ${\mathrm{EuMn}}_{2}{\mathrm{Ge}}_{2}$ and ${\mathrm{EuMn}}_{2}{\mathrm{Si}}_{2…
Abstract The pH-stabilisation method is a cost effective, reliable and environmental friendly way to control corrosion in gas/condensate pipelines where glycol is used as hydrate preventer. Increasing the pH to 6.5-7.5 facilitates the formation of a protective iron carbonate film on the steel surface and reduces corro…
Planar side gate devices are fabricated with epitaxial perovskite oxides by means of the voltage biased tip of an atomic force microscope. The high performance of the insulating gate barriers as well as the high dielectric permittivity of the chosen substrate are exploited to obtain a remarkable value of accumulated/d…