Materials Literature
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The effect of heal treatment on the evolution of reactivity of a highly porous pure synthetic char was studied with the aid of Raman scattering measurements. Two sets of experiments were carried out. A) Samples were oxidized in air at 600°C without heat treatment and Raman spectra were measured as a function of conver…
Multi-arm star block copolymers based on ε-caprolactone have been prepared by a core-first approach using propoxylated hyperbranched polyglycerol P(G52PO3) as a polyfunctional initiator. Various monomer/initiator ratios were employed in the Sn-catalyzed polymerization in order to vary the length of the caprolactone ar…
This paper summarises the results obtained in the MICAT (Mapa Ibero-Americano de Corrosão Atmosférica (Latin American Map of Atmospheric Corrosion)) atmospheric corrosion project (an Iberoamerican project on atmospheric corrosion, involving 14 countries and 75 atmospheric test sites) for zinc specimens exposed in the…
A guided-mode resonant filter with low sideband reflections is proposed. It is shown that, for serious reduction of out-of band reflectance, the combination of waveguide-grating filter design with conventional antireflective stack design methods is not adequate. To achieve symmetrical low sideband reflectances, indepe…
Fine La0.7Ca0.3MnO3 powders have been synthesized by mechanochemical processing, involving high-energy ball milling of LaCl3, CaCl2, MnCl2, and Na2CO3 and subsequent heat treatment. Single-phase La0.7Ca0.3MnO3 particles, dispersed in a NaCl matrix, were obtained for heat-treatment temperatures (Tht) of 750 °C or above…
The thermal conductivity and thermal diffusivity of oil-palm-fiber-reinforced untreated (Sample 1) and differently treated composites were measured with the transient plane source technique at room temperature and under normal pressure. All the composites were 40% oil-palm fiber by weight. The fibers were treated with…
Abstract N-protonation of 5,10,15,20-tetraalkylporphyrins with n-butyl, isobutyl, isopropyl, 1-ethyl-propyl or tert-butyl substituents yields the respective 22,24-dihydroporphyrins (22H + ,24H + -porphyrindiium salts) that exhibit highly nonplanar conformations. Depending on the steric demand of the meso substituents,…
A novel Gd-DTPA derivative with a built-in sulfonamide (SA) was synthesized as a contrast agent for MRI. The complex was designed to selectively target the enzyme carbonic anhydrase. It is shown that the longitudinal relaxation rates of aqueous solutions of Gd-DTPA-SA in the presence of carbonic anhydrase increase sig…
In the present study, the incongruent dissolution of barium from barium titanate (BaTiO 3 ) has been studied as a function of dispersion pH and powder volume fraction for two different BaTiO 3 powders. In alkaline dispersions, the barium solubility strongly increases as the pH increases, as suggested by thermodynamic…
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,…