Materials Literature
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The spontaneous polarization and electrostatic potential in ferroelectric films with domain structures have been calculated based on phenomenological theory. The polarization is reduced at the film surface due to a depolarizing field. The domain width, free energy, and Curie temperature as functions of film thickness…
The study of the formation of Sulfur Hexafluoride (SF6) dissociation products under point to plane corona discharges was carried out at PSF6=300 kPa using different discharges production conditions (50 Hz ac voltage, dc negative polarity voltage, mean discharge current intensity Ī varying between 2 and 45 μA for dc n…
We report optical measurements of ${\mathrm{NdNiO}}_{3}$ that undergo a phase transition from a paramagnetic metal to an antiferromagnetic insulator at 200 K (=${\mathit{T}}_{\mathit{c}}$). The opening of a charge gap is observed in the optical conductivity spectrum [\ensuremath{\sigma}(\ensuremath{\omega})] below ${\…
The quantum-confinement effect is demonstrated in the luminescence of the ${\mathrm{CsPbCl}}_{3}$-like aggregated phase in ${\mathrm{Pb}}^{2+}$-doped CsCl single crystals. Namely, microscopic excitonic superradiance is considered to explain the observed picosecond decay kinetics of the aggregated-phase emission band a…
We report the first experimental observation of two chemisorption states for molecular oxygen on a TiO2(110) surface containing anion vacancy sites. The first molecular species can be photoactivated to oxidize coadsorbed CO to CO2 (α channel) and undergoes slow photodesorption. The second molecular oxygen species only…
Passive chemical-vapor-deposited diamond layers have the potential to improve thermal conduction in electronic microstructures because of their high thermal conductivities. The thermal resistances for conduction normal to the boundaries of diamond layers, which must be small in order to realize this potential, have no…
The nature of an UV cathodoluminescence band, which can appear in both boron-doped high-pressure high-temperature (HPHT) synthetic diamond and boron-doped diamond grown by chemical-vapor-deposition (CVD) techniques, is investigated. The band has a peak energy at 4.6 eV (270 nm), a full width at half-maximum of ∼0.4 eV…
Recently, it has been shown that, upon cooling, disordered Pb(Sc1/2Ta1/2)O3 ceramics transform spontaneously from a relaxor state to a ferroelectric state when processed in a manner that suppresses lead vacancies. If lead vacancies are present, the spontaneous ferroelectric transition is suppressed and the ceramics ex…
Angle-resolved ultraviolet-photoelectron spectroscopy and angle-resolved secondary-electron emission spectroscopy have been carried out for a film of single-crystalline hexagonal boron nitride (h-BN) formed on the Ni(111) surface to investigate both the valence- and conduction-band structures. The thickness of the fil…
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” opt…
Abstract Impact properties of perlite‐filled high‐density polyethylene (HDPE) composites were studied with the Charpy method by using both notched and unnotched samples. γ‐Aminopropyltriethoxy silane (γ‐APS, A‐1100) was used as a silane coupling agent to improve the interfacial adhesion. The influences of the molecula…
Abstract Blends of a PPO–PS alloy with a liquid crystalline polymer have been studied for their dynamic properties, rheology, mechanical properties, and morphology. This work is an extension of our previous work on PPO/LCP blends. The addition of the LCP to the PPO–PS alloy resulted in a marked reduction in the viscos…
ABSTRACT In the application of chemical inhibitors in field squeeze treatments for the prevention of sulphate and carbonate mineral scale formation, it is very important that the chemical species involved can be accurately assayed. When the inhibitor concentration drops below a predetermined threshold level for scale…
Abstract In this paper, results from static tests have been used to establish scale inhibitor adsorption mechanisms and levels in consolidated reservoir cores and to rank inhibitors for their adsorption behaviour and, in some cases, squeeze return lifetimes. The purpose of this rapid and simple type of bulk adsorption…
ABSTRACT The phase behavior of a commercial phosphino-polyacrylate inhibitor (PPAA) in aqueous brine has been characterized as a function of temperature, pH, and the Ca++ and PPAA concentrations. The quantity of precipitate formed has been determined as a function of the same variables. Contrary to expectations, over…
Inorganic dusts from different herbs and spices are investigated in this study using both standard thermoluminescence measurements of integrated intensity versus temperature and measurements of the thermoluminescence emission spectra (intensity as a function of both temperature and wavelength). The importance of parti…
The dimanganese (II,II) catalase from Thermus thermophilus, MnCat(II,II), arginase from rat liver, Arg(II,II), and several dimanganese(II,II) compounds, LMn2XY2, which are functional catalase mimics, all possess a pair of coupled Mn(II) ions in their catalytic sites. For each of these, we have measured by EPR spectros…
Abstract A scale inhibitor "precipitation" squeeze is one of the two main types of treatment for preventing downhole scale deposition; the other type is an adsorption squeeze. However, unlike for the adsorption squeeze process, the mechanism for inhibitor retention within the formation through precipitation/re-dissolu…
Electrical tree growth (a long-term electrical breakdown process) has been investigated in Araldite CT200 and CT1200 epoxy resins as a function of voltage and material age (defined as the time between manufacture and testing of pin-plane samples). Reproducible and predictable electrical tree growth was obtained for bo…
Abstract It has been found that appreciable carbon black flocculation can occur in filled rubber stocks during storage or vulcanization in the absence of shear. The kinetics of this flocculation process were studied by means of low strain dynamic mechanical property and electrical conducitvity measurements. The result…