Materials Literature
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Abstract The size‐dependent breeding of sodium chlorate crystals can be determined by carrying out experiments with seed crystals of optical antipodes of different sizes that undergo absolutely identical experimental conditions. Small portions of right‐ and left‐handed seed crystals of different sizes were used. The n…
Describes the preparation and properties of heat‐resistant paints based on an epoxy blended with rhodorsil silicone resin. Studies the heat‐resistant properties as per ASTM standard (D 2485‐91). Also determines the properties of the liquid paint and coated metal panels. Assesses the thermal degradation of the coating…
Three monomeric Cd(II) phenoxide complexes have been prepared by reacting Cd[N(SiMe(3))(2)](2) with 2 equiv of 2,6-disubstituted phenols bearing sterically bulky tert-butyl or phenyl groups. The strongly coordinating solvents THF, tetrahydrothiophene (THT), and pyridine used for these reactions were incorporated into…
The characteristics, that is, morphology, size distribution, alloy phase and microstructure of U3Si and U3Si2 powders, solidified rapidly by a centrifugal atomization, were investigated. The atomized powders consist of spherical particles with a relatively narrow size distribution independent of the alloy composition.…
Abstract Hydrodynamics of foam films in a porous medium depend strongly on the pore geometry, foam quality, foam flow rate, surfactant formulation, rheological properties of the film, and the capillary pressure in the medium. These dynamics were studied numerically by simulating the behavior of a foam film as it trave…
QQC, Inc. has developed a revolutionary diamond deposition technique which does not require a vacuum, or H2, or “chemical” or physical pre-treatment of surfaces. The process utilizes a combination of various pulsed lasers and is performed at the laboratory p-t conditions: with CO2 and N2 as shrouding gases. Crystallin…
Magnetization measurements with a SQUID magnetometer have been carried out on a ferroelectric single domain sample along the three orthorhombic directions. The Néel (Curie) temperature was found at 26 ± 0.5 K and the spontaneous magnetization of the weakly ferromagnetic phase to lie along the orthorhombic b direction…
Cells of Cytophaga johnsonae (now Flavobacterium johnsoniae) are able to translocate on solid surfaces but are unable to swim in liquid media. Organelles that may be involved in this gliding motility have not been detected, and the mechanism(s) responsible remains unknown. The movement of latex beads attached to the c…
Abstract A range of allophane samples (atomic AI/Si bulk ratios 1.1-1.9) from Silica Springs, New Zealand, has been characterized by X-ray photoelectron spectroscopy (XPS). Binding energies of Si 2 s , Si 2 p , Al 2 p , O 1 s , C 1 s , and N 1 s electrons, together with the kinetic energies of Al KL 23 L 23 Auger elec…
The kinetics of the primary phase formation in a glass ceramic base glass near the cordierite composition in the MgO–Al2O3–SiO2 system, with additions of ZrO2 and TiO2 as nucleating agents, have been investigated by combining different small-angle scattering techniques. Phase formation in the base glass heated isother…
The photophysical and photochemical properties of two anthryl-labeled polyimides have been studied by absorption and fluorescence spectroscopy, single-photon counting, and picosecond transient absorption measurements. The observed emission decay is triexponential, with a very short-lived component of ∼50 ps being attr…
The glass transition of poly(phenylene sulfide) (PPS) has been examined by differential scanning calorimetry (DSC), Fourier transform infrared spectroscopy (FT-IR), and energy dispersive X-ray diffraction (EDXD) techniques. All of them evidenced the α transition of the polymer, and the results obtained with the differ…
Copper β-substituted 5,10,15,20-tetraphenylporphyrins (CuTPP-β) and their cation radicals with varied electron-withdrawing/donating substituents were studied by resonance Raman spectroscopy. A1g, Eu and substituent modes were observed with Soret excitation. Q-band spectra and CuTPP-d7-CHO shifts aided mode assignments…
Three unsubstituted cyclic ketene acetals (CKAs), 2-methylene-1,3-dioxolane, 1a, 2-methylene-1,3-dioxane, 2a, and 2-methylene-1,3-dioxepane, 3a, undergo exclusive 1,2-addition polymerization at low temperatures, and only poly(CKAs) are obtained. At higher temperatures, ring-opening polymerization (ROP) can be dominant…
Low-voltage scanning electron microscopy (LV-SEM) was used to monitor contamination by carbonaceous compounds on the surface of two different commercially available titanium dental implants. Because of its higher surface sensitivity, the LV mode allows us to image contaminating materials on surfaces that are undetecte…
A series of neutral and cationic Ni(II) and Pd(II) complexes with the open tetraaza ligand bisoxazoline bisamine N 4, were prepared and characterized. Neutral complexes presented dimeric structures of stoichiometry [M 2 (μ-N 4 )X 4 ] (M = Ni ( 1 ), Pd ( 2 )) and underwent slow decomplexation in coordinating solvents.…
During 3 years that have passed since MEIPIC-2 conference investigations have been conducted in the field of expanding and ascertaing data obtained in physics and technique of magnetoelectric phenomena. Below is a brief review of papers presented to MEIPIC-3 conference.
The infrared and Raman spectra of tetracalcium phosphate (Ca4P2O9) were measured and interpreted on the basis of factor group analysis. Factor group splitting can be noted for the various internal vibrational modes of the PO4 3- ion. However, a fewer number of factor group-split bands can be seen than predicted becaus…
Isostructural HfGeO 4 and ZrGeO 4, activated with Ti 4+, yield blue luminescence when irradiated with X-rays. An adequate understanding of the observed blue luminescence requires the determination of the site occupancy and the local Ti 4+ environment; i.e., the site symmetry. Raman spectroscopy has been used to probe…
The toolbox for spin coupling is now well equipped, since nearly all possible topologies of organic tri- and tetraradicals are known, which can be applied as building blocks for the synthesis of practically useful polyradical materials. High-spin polyradicals could be useful as organic ferromagnets, whereas several lo…