Materials Literature
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The possibility of energy transfer over long distances in the form of laser radiation propagating in dielectric optical fibres is discussed. Because nonlinear-optical phenomena in glasses prevent the transfer of high radiation powers in standard two-layer fibres, the outlook for this transfer is associated with the de…
El buen comportamiento del zinc frente a la corrosión atmosférica ha conducido a que este material sea utilizado ampliamente, sobre todo, como recubrimiento del acero. Por este motivo, desde hace unos 50 años, se han venido realizando estudios sistemáticos para tratar de comprender los mecanismos de su interacción con…
Ferroelectric barium titanate ( BaTiO 3 ) films have been prepared from barium acetate and titanium (IV) isopropoxide precursors by the sol-gel technique. The structural and optical properties of films annealed at different temperatures have been investigated. The as-fired films were found to be amorphous and crystall…
Microstructural features of the solid solution series of 0.45(Bi1−xLax) FeO3–0.55PbTiO3 with x=0.1, 0.2, and 0.3 have been investigated by transmission electron microscopy. The experimental results demonstrate that substituting La for Bi leads to a rich variety of structural phenomena: the typical crystal structure ch…
The glass system having (B2O3)0.60(CaO)0.25(ZnO)0.15-x (TiO2)x, where x = 0.0, 0.025, 0.05,..., 0.15, was investigated using infrared spectroscopy, differential thermal analysis, density, magnetic susceptibility and dc electrical conductivity. The obtained IR results showed that most titanium ions exist as network for…
The self-assembly formation of straight and periodic nanogroove arrays was carried out on the surface of Li-doped NiO thin films by use of atomic steps on the substrate. The nanostructure was formed by annealing Li-doped NiO (111) epitaxial thin film prepared on an atomically stepped α-Al2O3 (0001) substrate via pulse…
Abstract In a previous work, a theoretical model for the cationization of wheat starch in a modular self‐wiping corotating twin screw extruder has been developed and experimentally validated. Our objective in the present article was to use this model in a first step to optimize the cationization reaction on a laborato…
The crystalline thin film growth of the organic material, copper phthalocyanine (CuPc), by organic vapor-phase deposition (OVPD) is studied using high-pressure reflection high-energy electron diffraction (HP-RHEED). In situ growth of this material was monitored, in real time, on both highly oriented pyrolytic graphite…
For the first five members of the homologous series of 4-n-alkyl-4'-cyanobiphenyls in the nematic and isotropic phases, molecular dynamics (MD) simulations were performed by using a united atom model. An odd-even effect was seen to be found in the molecular length, width, biaxiality, and inertia tensor anisotropy with…
The microrheology of viscoelastic fluids containing light-scattering inclusions is measured by depolarized dynamic light scattering (DDLS) from optically anisotropic spherical colloidal probes. The anisotropy of the probes allows us to measure both their translational and the rotational mean squared displacements simu…
The authors synthesized high-quality gold nano-sea-urchin in aqueous solution with an environment-friendly method. They found that the gold nano-sea-urchin can induce the interaction of surface plasmon resonance (SPR) mode with substrate. The SPR peak splits and blueshifts from 630to440nm and the result has potential…
The ultraviolet (UV) irradiation of a titanium dioxide (TiO2) film surface gives rise to two simultaneous phenomena: photocatalysis and superhydrophilicity. Photocatalysis has been thoroughly studied, but the mechanism governing superhydrophilicity remains controversial. The authors’ investigations show the effects in…
Silicon nanoclusters were formed in plasma-enhanced chemical vapor deposited substoichiometric silicon oxide films by annealing at 1100°C for 1∕2h as a function of different deposition parameters. The samples were analyzed by energy filtered transmission electron microscopy and Rutherford backscattering. At any deposi…
We use the -operator to construct a family of Fibonacci tilings of the unit interval consisting of short and long elementary intervals with the ratio of the lengths equal to the golden section . We prove that the tilings satisfy a recurrence relation similar to the relation for the Fibonacci numbers. The ends of the e…
The electronic behavior of metallic carbon nanotubes under the influence of atomistic vacancy defects present in the channel is theoretically investigated using non-equilibrium Green’s function method self-consistently coupled with three-dimensional electrostatics. A nearest neighbor tight binding model based on a sin…
Nephrogenic systemic fibrosis/nephrogenic fibrosing dermopathy (NSF/NFD) is a rare fibrosing disorder that occurs in patients with renal failure. It is associated with significant mortality and morbidity. Patients typically present with painful or pruritic indurated plaques involving the limbs and trunk, with sparing…
BACKGROUND: Nephrogenic fibrosing dermopathy/nephrogenic systemic fibrosis (NFD/NSF) is a fibrosing cutaneous disorder recently recognized to have systemic manifestations. The disease is characterized clinically by an acute onset of hardening and thickening of the skin of the extremities and trunk, often resulting in…
Abstract To increase the compatibility of polystyrene (PS) and polyolefin elastomer (POE) blends, a Lewis acid catalyst, aluminum chloride (AlCl 3 ), was adopted to initiate the Friedel–Crafts alkylation reaction for the formation of PS‐ graft ‐POE copolymer. Dynamic mechanical analysis indicated that PS/POE and PS/PO…
The atomic force microscopy images showed that the dimensional structural transformation from CdxZn1−xTe quantum dots (QDs) with Cd mole fractions of 0.5 and 0.6 to CdxZn1−xTe quantum wires occurred at a Cd mole fraction of 0.8. Photoluminescence spectra showed that the excitonic peak corresponding to the transition f…
Employing high-tunability PbO–ZnO–Nb2O5 thin film dielectrics, low-voltage and high-tunability interdigital capacitors (IDCs) were implemented on a silicon substrate. In order to reduce the bias voltage of the IDC and increase its tunability, its electrodes were fully embedded into the thin film dielectrics to confine…