Materials Literature
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We have developed a three-dimensional Monte Carlo simulator for thin film growth and applied it to understand the morphologies of thin films prepared by dynamic oblique deposition with a special emphasis on an effective surface area. Columnar shapes zigzag, helix, and cylinder are successfully reproduced, and the pack…
Abstract New types of phase transitions occurring in molecule-based materials have recently drawn great attention, in which electrons are directly involved. In this paper are given calorimetric investigations aimed at the elucidation of the mechanisms governing such phase transitions as (i) spin crossover phenomena oc…
The 20 MHz water relaxivity (r(1)) of gadolinium(III) complexes formed with two fatty acid analogues of 1,4,7,10-tetraazacyclododecane-1,4,7,10-tetrakis(methylene phosphonate) were shown to increase substantially in the presence of albumin. The r(1) values of Gd(C(8)-DOTP)(5-) and Gd(C(11)-DOTP)(5-) in water were simi…
In traditional alloy development, experimental investigations with many different alloy compositions are performed. The selection criteria for multicomponent alloying elements and their compositions become diffuse in a traditional approach. Computational thermochemistry as used in the Calphad approach can provide a cl…
Layered double hydroxides are antitype 2/1 clay minerals that can be synthesized rapidly under laboratory conditions. Due to their high anion exchange capacities, layered double hydroxides have been investigated as potential adsorbents for removal of anionic contaminants from aqueous systems. In this study, uncalcined…
We present ab initio density-functional calculations for the electronic structure of the dilute magnetic semiconductors ${\mathrm{Mn}}_{x}{\mathrm{Ga}}_{1\ensuremath{-}x}\mathrm{As}$ and ${\mathrm{Mn}}_{x}{\mathrm{In}}_{1\ensuremath{-}x}\mathrm{As}$ with a realistic $x=0.063.$ We find that the introduction of Mn pertu…
Abstract PVC‐clay nanocomposites were prepared by melt blending of the polymer with an organically modified clay, both in the presence and in the absence of di(2‐ethylhexyl) phthalate (DOP). The clay can serve as a plasticizer for PVC in the absence of DOP. The nanocomposites were characterized by using X‐ray diffract…
The Affiliate Plan, established by the IEEE Board of Directors, enables individuals who are not members of the IEEE, but who have an interest in the field of plasma science, to join the IEEE Nuclear and Plasma Sciences Society. Admission as an affiliate requires only membership in a professional society listed below.…
Work has been performed to investigate the effect of inhibitor charge and pH, in the range 3.9 to 6.5, on the efficiency of various tertiary and quaternary amines. Results have revealed that for such adsorption type inhibitors performance at a given pH depends critically upon the charge of the adsorbing species. At pH…
A synthesis has been developed for 2,3,7,8,12,13-hexakis[2-(2-methoxyethoxy)ethoxy]-tricycloquinazoline (TCQ6EO2M) in which the ethylenoxy side chains are introduced before elaboration of the heterocylic core. This discogen gives a hexagonal columnar phase (Colh) between 77 and 233°C. n-Doping using potassium metal is…
Spectroscopic and thermal analysis indicates that tellurite glasses doped with B2O3 and GeO2 are promising candidate host materials for wide-band erbium doped fiber amplifier (EDFA) with a high 980 nm pump efficiency. In this study, we measured the thermal stabilities and the emission cross-sections for Er3+: 4I13/2 →…
A structurally‐related model for the viscosity of silicate melts developed by the present authors has been extended to melts containing alumina. In the binary Al 2 O 3 ‐SiO 2 system, viscosity was modelled by treating Al 2 O 3 as a metal oxide, i.e., as a network modifier based on the similarities in the general behav…
Phosphate solubility and reactions were investigated in each of three horizon samples from six cultivated soils representing Spodosols, Alfisols and Entisols, with pH ranging from 4.6 to 7.7. Soils were incubated for 30 days near field capacity moisture content without P application or with 44.5 mg P kg−1 soil applied…
A novel cryostat was developed for in situ neutron scattering studies on vapor-deposited amorphous samples. By the use of this cryostat, vapor-deposited amorphous ice was prepared at ca. 8 K. The neutron scattering spectra of the as-deposited sample and those annealed at ca. 120 K, 160 K, and 250 K were measured at 50…
Abstract Plane-wave pseudopotential total energy calculations have been applied to investigate the structure and energetics of the Cs/K exchange into interlayer sites in muscovite mica. Novel muscovite structures were designed to isolate the effects of 2:1 layer charge, cation size/interlayer site shape, and tetrahedr…
4,4′-Methylenebis(2-tert-butylaniline) was synthesized and reacted with pyromellitic dianhydride to produce a polyimide that showed excellent solubility in conventional organic solvents. Solutions of this polyimide could be cast into transparent, flexible and tough films. The number-average molecular weight, as determ…
Abstract The mineral and chemical composition of green glauconitic grains from ODP Site 959 (2100 m water depth) located on the northern flank of the Ivory Coast—Ghana Marginal Ridge was studied. Recurrent winnowing of a 20 m thick Pleistocene succession resulted in a low accumulation rate and stratigraphic hiatuses.…
Abstract Experimental alteration of a rhyolitic obsidian by solutions containing variable concentrations of Mg was carried out at 100, 150 and 200 ° C, for 30, 60 and 90 days, to investigate the mechanism of smectite formation. The smectite exhibits two distinct morphologies: (1) small flakes (aggregates of a few crys…
The pressure dependence of the glass transition temperature (T g ) has been estimated from the pressure effect on the activation energy of electric conductivity in alkaline (albite, haplogranite), alkaline earth (anorthite) silicate and SiO 2 glasses. The dc conductivity (σ) has been determined from the electrical imp…
Two types of lanthanum based chromite-titanate perovskite materials have been tested for use as porous ceramic anodes in SOFC applications. The calcium- or strontium- doped chromium-rich materials, with composition La0.7A0.3Cr0.8Ti0.2O3–δ (A = Ca, Sr), showed p-type conductivity under reducing conditions. The titanium…