Materials Literature
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High Resolution Image Download MS PowerPoint Slide Natural graphite was intercalated, thermally exfoliated, and dispersed in acetone to prepare graphite nanoplatelets (GNPs, G n ) of controlled aspect ratio. Thermal conductivity measurements indicate that few graphene layer G n, where n ∼ 4, with a thickness of ∼2 nm…
ZnO has received much attention over the past few years because it has a wide range of properties that depend on doping, including a range of conductivity from metallic to insulating (including n-type and p-type conductivity), high transparency, piezoelectricity, wide-bandgap semiconductivity, room-temperature ferroma…
This paper reviews the crystal chemistry, synthesis, densification, microstructure, mechanical properties, and oxidation behavior of zirconium diboride (ZrB 2 ) and hafnium diboride (HfB 2 ) ceramics. The refractory diborides exhibit partial or complete solid solution with other transition metal diborides, which allow…
The authors report on the measurement of the second order nonlinear optical properties of ZnO films deposited by low temperature radio frequency sputtering on ZnO:Al coated glass substrates. They show that ZnO:Al plays a crucial role as a buffer layer for the successive growth of ZnO. The effect of aluminum doping on…
Gonatozygon aculeatum Hastings and Cosmarium quadratum Ralfs ex Ralfs were recorded for the first time in the freshwater algal flora of Turkey.
Magnetic properties of single crystalline Ga1−xMnxS (x=0.09) have been measured near the spin-glass transition. No other III-VI DMS is currently known to exhibit a spin-glass transition for comparison with Ga1−xMnxS. Ga1−xMnxS (Tc=11.2K) shows unexpected similarity to II-VI DMS Zn1−xMnxTe (Tc=20.8K). For both systems,…
Polyacrylonitrile (PAN)/Fe₂O₃ nanocomposite membranes with a thickness of 0.02 ㎜ were electrospun by adding 0 to 5 wt% of Fe₂O₃ into PAN. The surface tension, density, kinematic viscosity and dynamic viscosity of the PAN solution were determined to be 33.8±1 mN/m, 0.9794 g/㎖, 1548.6 ㎟/sec and 1516.7 cP, respectively.…
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…