Materials Literature
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ZnGa 2 O 4 fine particles with a single phase of spinel were synthesized from a mixed solution of gallium sulfate and zinc sulfate in the presence of aqueous ammonia under hydrothermal conditions above 180°C. The effects of treatment temperature and ZnO/Ga 2 O 3 molar ratio in the starting solution on the crystallite…
Electrical conductivity relaxation experimental data of ionically conducting glasses, crystals, and melts are most often discussed in the context of either the real part of the complex conductivity, $\mathrm{Re}[{\ensuremath{\sigma}}^{*}(\ensuremath{\omega})],$ the imaginary part of the complex permittivity $\mathrm{I…
Room-temperature growth of NiO thin films using the pulsed laser deposition (PLD) technique was investigated. Epitaxial growth of NiO thin films on (100)MgO substrates was not obtained when we simply placed a shadow mask between the substrate and target (eclipse PLD method), but was obtained when we used the conventio…
An experimental study of x-ray diffraction of single-walled carbon nanotube (SWNT) bundles in the temperature range from 290 to 1600 K is reported. The lattice constant (L0) of a close-packed trigonal arrangement of SWNTs in the bundles shrank over the entire temperature range. The hysteretic temperature dependence of…
Solid‐state compatibility and melting relationships in the subsystem Al 2 O 3 —MgAl 2 O 4 —CaAl 4 O 7 were studied by firing and quenching selected samples located in the isopletal section (CaO·MgO)—Al 2 O 3 . The samples then were examined using X‐ray diffractomtery, optical microscopy, and scanning and transmission…
We present an experimental investigation of the morphological transition of lamellar eutectic growth fronts called "formation of eutectic colonies" by the method of thin-sample directional solidification of a transparent model alloy, CBr4-C2Cl6. This morphological transition is due to the presence in the melt of trace…
Ordered arrays of nickel nanowires have been prepared using pulsed electrodeposition. Two self-patterning anodization processes were used to fabricate alumina pore matrices into which nickel was deposited from a Watts bath: two short millisecond deposition pulses followed by a long delay yielded almost 100 % filled po…
The manufacture of unsaturated alcohols through selective hydrogenation of α,β-unsaturated aldehydes continues to be a topical issue. The objective of the present study is to investigate the use of supported gold catalysts for the partial hydrogenation of acrolein to allyl alcohol. So far, in catalyst research or even…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTSuperconducting Transition of (TMTTF)2PF6 above 50 kbar [TMTTF = Tetramethyltetrathiafulvalene]Takafumi Adachi, Emiko Ojima, Kiyonori Kato, Hayao Kobayashi, Takafumi Miyazaki, Madoka Tokumoto, and Akiko KobayashiView Author Information Institute for Molecular Science,…
Abstract A model to compensate the 2:1 layer having excess negative charge owing to the reduction of Fe 3+ to Fe 2+ by sodium dithionite buffered with citrate-bicarbonate in nontronite, beidellite, and montmorillonite is proposed. This model is based on reassessing published experimental data for Fe-containing smectit…
An experimental method to determine the order degree of isotactic poly(propylene) (iPP) via regularity bands was developed using fast heating Fourier transform infrared spectroscopy. The various regularity bands can be rearranged in terms of the order degree from high to low: 940, 1 220, 1 167, 1 303, 1 330, 841, 998,…
The effect on the γ‐Al 2 O 3 ‐to‐α‐Al 2 O 3 phase transition of adding divalent cations was investigated by differential thermal analysis, X‐ray diffractometry, and surface‐area measurements. The cations, Cu 2+ , Mn 2+ , Co 2+ , Ni 2+ , Mg 2+ , Ca 2+ , Sr 2+ , and Ba 2+ , were added by impregnation, using the appropri…
Electrical insulation performance of compressed gas insulated switchgear (GIS) and gas insulated transmission line (GITL) systems is adversely affected by metallic particle contaminants. Dielectric coatings applied to the inside surface of the outer enclosure of a coaxial GIS/GITL system improve the insulation perform…
Abstract The effects of ion irradiation in the ABO 4 -type compounds were compared by performing experiments on four materials that include the most common crystal structures (monazite vs. zircon) and chemical compositions (phosphates vs. silicates) for these phases. Pure synthetic single crystals of ZrSiO 4 , monocli…
A novel sensor based upon surface-enhanced Raman scattering (SERS) has been constructed by immobilizing colloidal silver particles onto the distal end of an optical fiber. This same single fiber was then used to both transport the exciting laser radiation and collect the Raman scattering from analytes sorbed onto the…
The morphology and behaviour of the chromosomes of dinoflagellates during the cell cycle appear to be unique among eukaryotes. We used synchronized and aphidicolin-blocked cultures of the dinoflagellate Crypthecodinium cohnii to describe the successive morphological changes that chromosomes undergo during the cell cyc…
We describe a pulsed spectrometer for detection of nuclear quadrupole resonance on the nuclei of nitrogen N-14 with fast Fourier transform. The use of a multipulse sequence, four channel system for data registration and processing permits detection of the nuclear quadrupole resonance (NQR) signal in the presence of st…
Abstract Hydrothermal syntheses were performed at various pH values and temperatures to induce variability in kaolinite defect density. Temperature of synthesis ranged from 200 to 240°C, for 21 d. Initial pH at room temperature ranged from 0.5 to 14. The starting material was a hydrothermally treated gel, with an atom…
The isothermal oxidation of the 200 face of HfC and TiC single crystals was performed at temperatures of 700°—1500°C and at oxygen pressures of 0.08—80 kPa for 4 h. The weight gain by oxidation of the two crystals was followed using an electromicrobalance. A polished cross section of the oxidized crystals was observed…
A gene (pueA, polyurethane esterase A) encoding an extracellular polyurethanase (PueA) was cloned from Pseudomonas chlororaphis into Escherichia coli. The enzyme secreted from E. coli showed esterase activity when assayed with p-nitrophenyl acetate. Subcloning of a 3. 2-kb SalI-EcoRI fragment into a T7 RNA polymerase…