Materials Literature
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Dodacanethiol-capped silver “quantum dot” particles (Q-particles) have been synthesized using a novel biphasic microemulsion (Winsor II type) of diethyl ether/AOT/water. FT-IR investigations and elemental analyses support the encapsulation of silver particles by dodecanethiol while the transmission electron micrograph…
The mechanical behavior of MoSi 2 reinforced–Si 3 N 4 matrix composites was investigated as a function of MoSi 2 phase content, MoSi 2 phase size, and amount of MgO densification aid for the Si 3 N 4 phase. Coarse‐phase MoSi 2 ‐Si 3 N 4 composites exhibited higher room‐temperature fracture toughness than fine‐phase co…
Abstract Hydrogen-forms of <2 µm fractions of six bentonites of various Fe contents were prepared by H + →OH - →H + ion exchange using resins. Potentiometric titration curves revealed that the number of strong acid sites varied and accounted for 60-95% of the total acidity in the freshly prepared H-forms. The numbe…
An expression for the bond energy between two chemical species, A and B, in terms of the chemical potentials, the hardnesses, and the condensed Fukui functions of the isolated species, and the hardness of the system AB at equilibrium, is derived by dividing the total interaction energy into two contributions, one that…
There are few studies about K status and K exchange equilibrium for Vertisols of southwestern Spain, and the K requirements for crop production in this region are not well defined. Moreover, there is no information on the relationship between the kinetics of K release and plant K uptake for these soils. The objectives…
An intimate Ba‐Al‐Al 2 O 3 ‐SiO 2 powder mixture, produced by high‐energy milling, was pressed to 3 mm thick cylinders (10 mm diameter) and hexagonal plates (6 mm edge‐to‐edge width). Heat treatments conducted from 300° to 1650°C in pure oxygen or air were used to transform these solid‐metal/oxide precursors into BaAl…
Using frequency and temperature-dependent conductivity data for $x$ $\mathrm{AgI}\ensuremath{\cdot}(1\ensuremath{-}x)$ ${\mathrm{AgPO}}_{3}$ glasses in the composition range from $x=0.10$ to $x=0.55,$ we find that the number density of mobile ions as well as the ionic relaxation mechanism are independent of temperatur…
The non-phosphorylating glyceraldehyde-3-phosphate dehydrogenase catalyses the irreversible reaction of glyceraldehyde-3-phosphate to 3-phosphoglycerate by the reduction of NADP to NADPH. This is in contrast to the extensively analysed phosphorylating glyceraldehyde-3-phosphate dehydrogenases which catalyse the revers…
We report the synthesis, the physicochemical characterization, and biological evaluation of a new caged glutamate, N-(o-nitromandelyl)oxycarbonyl-L-glutamic acid (Nmoc-Glu), that liberates free glutamate on photolysis. The low affinity of certain glutamate receptors and their rapid entry into desensitization have effe…
Polyarylmethyl high-spin polyradicals are designed to possess a structure corresponding to simple spin clusters, where component spins ( S ‘) arise from strong ferromagnetic coupling through 1,3-phenylene units and weak ferromagnetic spin coupling between the component spins is mediated via 3,4‘-biphenylene (or 3,5,4‘…
Thermal degradation of poly(aryl-ether-ether-ketone) (PEEK) was investigated using stepwise pyrolysis/gas chromatography/mass spectrometry (Py/GC/MS) by consecutively heating the sample at fixed temperature intervals to achieve narrow temperature pyrolysis conditions. The individual mass chromatograms of the various p…
The electrochemical behavior of (TPPBr x )Co (TPPBr x = the dianion of β-brominated-pyrrole tetraphenylporphyrin and x = 0−8) is reported under an N 2 or a CO atmosphere in dichloromethane containing tetra- n -butylammonium hexafluorophosphate as supporting electrolyte. Each investigated compound undergoes three rever…
Abstract For the purpose of clay examination, a new one-step method for the removal of organic matter was developed using sodium peroxodisulphate combined with different buffers such as sodium hydrogen carbonate, disodium hydrogen phosphate and disodium tetraborate. From an early Cretaceous black shale from the Apenni…
Irradiation of a hexane/THF solution of Mn 2 (CO) 10, 3,6-di- tert -butyl-1,2-benzoquinone, and pyrazine has been used to prepare the linear [ trans -Mn(μ-pyz)(3,6-DBQ) 2 ] n polymer. Structural characterization [monoclinic, C 2/ m, Z = 2, a = 20.148(5) Å, b = 7.547(1) Å, c = 14.156(2) Å, β = 112.23(2)°, V = 1992.5(6)…
Electron irradiation of 100% internal quantum efficiency silicon photodiodes having a thin (60 /spl Aring/) SiO/sub 2/ dead layer results in measured responsivities ranging from 0.056 A/W at an incident electron energy E/sub 0/=0.2 keV to 0.24 A/W at E/sub 0/=40 keV. By comparing the data to a Monte Carlo simulation o…
The phase transformations and the glass−liquid transition on heating of supercooled liquid triphenyl phosphite (TPP) were studied by differential scanning calorimetry and fixed frequency dielectrometry, and the nature of its various states was discussed. The dielectric behavior of the so-called “glacial” phase shows t…
Uniform cubic manganese carbonate, MnCO 3, particles of two modal sizes (∼0.8 and 8 μm) were produced by homogeneous precipitation from aqueous solutions of manganese sulfate and urea at elevated temperatures under limited experimental conditions. The larger particles were converted into Mn 2 O 3 and MnO on calcinatio…
Using a two-dimensional self-consistent field calculation and scaling theory, we investigate the interaction between two planar surfaces where: (1) each surface is grafted with both solvophilic and solvophobic homopolymers and (2) both surfaces are coated with solvophobic polyelectrolytes. The chains are tethered by o…
Oxygen permeation experiments were performed on dense mixed-conducting ceramic-metal composite membranes (thickness 0.2 to 2 mm) Bi1.5Er0.5O3-Ag with 10.0, 27.8, and 40.0 volume percent (v/o) silver, respectively, in the temperature range 873 to 993 K and oxygen partial pressure range 10–3.5 to 1 bar O2. The oxygen fl…
Five new compounds, which bring together two classical groups, Werner transition-metal hexaammine complexes and sulfosalts, have been prepared from supercritical ammonia. They form in two different structure types which are built from traditional octahedrally coordinated transition-metal hexaammine cations and anionic…