Materials Literature
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Synthetic analogues of francisite, a mineral of complex formula Cu3Bi(SeO3)2O2X with X = Cl, Br, I, have been obtained by solid state reaction. Contrary to the previous structure description, the framework can be better described as formed of copper(II)–oxygen layers linked together in the [001] direction by long bism…
A number of doped lanthanum chromite perovskites are considered as anode materials for solid oxide fuel cells with an yttria-stabilized zirconia (YSZ) electrolyte operating in hydrogen at 850°C. The polarization resistance is measured by impedance spectroscopy, and shown to depend significantly on the type and amount…
Among the light metal alloys, magnesium is the lightest structural material with a density of 1.74 g/cm3 and many attractive physical and mechanical properties combined with processing advantages. Therefore, it represents a very attractive material for a large amount of applications from main user automotive industry…
National Nanohybrids Materials Laboratory (NNML)School of Chemistry and Molecular Engineering, Seoul National University, Seoul 151-747, KoreaReceived May 26, 2001Negatively charged functional organic molecules such as retinoic acid, ascorbic acid, indole acetic acid, citricacid, salicylic acid, acidic dye (indigo car…
The Structure and Electrochemical Behavior of Nitrogen-Containing Nanocrystalline Diamond Films Deposited from CH4/N2/Ar Mixtures , Chen, Qingyun, Gruen, Dieter M., Krauss, Alan R., Corrigan, Timothy D., Witek, Malgorzata, Swain, Greg M.
Compound 1, containing an octamethylferrocene donor linked to a nitrothiophene acceptor via an ethenyl linker, shows a static first hyperpolarisability β0 of 95(±10) × 10−30 esu, which is reduced to 10(±2) × 10−30 esu on oxidation of the octamethylferrocene unit; this provides for a simple redox-based switching of the…
Material samples of silicone rubber with known differences in their composition, i.e. different filler content and extra silicone oil added, have been aged at the Anneberg field station on the west coast of Sweden. ac or dc voltage supplied to cylindrical samples at stress levels of 50 or 100 V/mm. The work includes l…
The undoping ZnO emitting films were deposited on Si substrates by dc reactive sputtering. There are two peaks of photoluminescence (PL), centered at 3.18 eV (ultraviolet), and at 2.38 eV (green), to be observed in the samples. We investigated the dependence of PL spectra on annealing temperature and annealing atmosph…
In this, Part II of a two-part study, the oxidation kinetics in air of the ternary compounds and are reported. For the first two compounds, in the 1000-1100°C temperature range and for short times (≈20 h) the oxidation kinetics are parabolic. The parabolic rate constants are for and for At 900°C, the kinetics are quas…
Abstract The formation of clay minerals within active fault zones, which results from the infiltration of aqueous fluids, often leads to important changes in mechanical behaviour. These hydrous phyllosilicates can (1) enhance anisotropy and reduce shear strength, (2) modify porosity and permeability, (3) store or rele…
Increasing the permittivity of the propagation medium inside a hollow tube lowers its cut-off frequency, allowing it to transmit a wider range of signal frequencies. This principle is applied to the design of dielectric windows that can be used to facilitate partial discharge (PD) detection at ultra high frequency (UH…
A new class of inorganic corrosion-resistant coating, zeolite coating, was prepared on aluminum alloys and shown to be highly corrosion resistant even in strong acid and pitting aggressive media. The coating also has good adhesion, wear- resistance, and paint compatibility. The in situ crystallization coating depositi…
Abstract The simple cup and rotor mini‐mixer, designed to blend very small polymer batches (0.3 g, MiniMAX), was compared to larger lab scale extruder (5 g, DACA): and a 16 mm co‐rotating twin screw (300 g/hr. PRISM). All were compared at the maximum shear rate in the cup and rotor mixer, 110 s −1 . Particle sizes of…
Small-angle neutron scattering (SANS) experiments were conducted on isotopic polystyrene blend films spin-coated onto hydrogen passivated silicon wafers over a wide range of wavevectors, q (0.56 ≤ q R G,bulk ≤ 50, where R G,bulk is the unperturbed radius of gyration of the chains). The films thickness varied from “bul…
The authors envision computational nanotechnology's role in developing the next generation of multifunctional materials and molecular-scale electronic and computing devices, sensors, actuators, and machines. They briefly review computational techniques and provide a few recent examples derived from computer simulation…
Calcium carbonate crystals of defined morphology have been produced on transformation of an amorphous calcium carbonate precursor within a constrained volume.
The microwave-assisted polyol reduction method was applied to the preparation of CdSe “nanoballs”. The cubic and hexagonal forms of the CdSe nanoparticles obtained were analyzed by XRD, TEM, HRTEM, UV-VIS, photoluminescence (PL) and photoacoustic spectroscopy. Formation of the hexagonal or cubic form of CdSe depends o…
We report on the fabrication of a polypyrrole/poly(methyl methacrylate) coaxial nanocable through the sequential polymerization of methyl methacrylate and pyrrole monomers inside the channels of mesoporous SBA-15 silica, followed by the removal of the silica template.
The hydrogenation of but-2-enal over supported Au catalysts is discussed, together with a detailed characterisation study using X-ray diffraction, infrared spectroscopy and transmission electron microscopy. Au/ZnO catalysts are found to be selective for the formation of the unsaturated alcohol, but-2-en-1-ol rather th…
Low protein adsorption is believed advantageous for blood-contacting materials and ethylene glycols (EG)-based polymeric compounds are often attached to surfaces for this purpose. In the present study, the adsorption of fibrinogen, serum, and plasma were studied by ellipsometry on a series of well-defined oligo(EG) te…