Materials Literature
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Within the transition metal oxide systems, vanadium presents a unique chemistry due to its capacity to form a great number of mixed-valence oxo clusters which often have the peculiarity to incorporate species that function, for size, shape, and charge, as templates. Prismatic, lustrous dark brown crystals of [(n-C(4)H…
The interfacial energy of calcium phosphate powders has been determined through contact angle measurements using thin-layer wicking techniques. The much smaller interfacial energy of octacalcium phosphate (OCP) in contact with water compared with that of hydroxyapatite (HAP) supports the observation that the crystalli…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTSynthesis and Characterization of Isostructural Metalloporphyrin Chalconitrosyl Complexes Ru(TTP)(NE)Cl (E = O, S) and a Remarkable Thionitrosyl/Nitrite → Nitrosyl/Thiazate TransformationD. Scott Bohle, Chen-Hsiung Hung, Annie K. Powell, Bryan D. Smith, and Sigrid Woca…
A scheme to estimate errors in maximum-entropy method (MEM) charge-density distributions via Monte Carlo simulations is presented. Knowledge of the errors in the density allows evaluation of the reliability of fine features in MEM electron densities. As a test example, the errors in the MEM electron-density distributi…
The preparation of ZrO 2 by alkaline hydrolysis of ZrOCl 2 ·8H 2 O, leads to an amorphous oxohydroxide precursor that upon calcination at temperatures higher than 350 °C produces a system with mixed crystallographic phases (monoclinic and tetragonal). Preparation of this material by the same procedure but adding diffe…
When an alternating stack of molten polymer sheets is pulled in uniaxial tension parallel to the layers, interfacial area per unit volume increases, amplifying interfacial effects. Multilayers of several polymer pairs were prepared by lamination (up to 100 layers). Pairs with low and high interfacial tension, Γ, and p…
Abstract The correlation between the mechanical properties of revulcanized SBR, total and polysulfidic crosslink density, gel fraction of original vulcanizate, ultrasonically devulcanized, and revulcanized rubber is described. Under some processing conditions the tensile strength of revulcanized SBR is found to be muc…
Amorphous diamond-like carbon films were grown onto (100) Si substrates using rf plasma CVD of methane. Then the interface states were examined using the conductance technique. Metal–insulator–semiconductor (MIS) devices were made and proper modeling was used. The statistical model was used to fit the experimental dat…
A systematic investigation of the reduction of aqueous Na(2)WO(4) with aqueous NaBH(4) at ambient temperatures reveals the formation of several lower valent tungsten oxides such as the tetragonal (x < 0.38) and cubic (x > 0.43) tungsten bronzes Na(x)()WO(3) and the binary oxides WO(2) and W(24)O(68). The nature of the…
Abstract The sorption and downward transport of trace metals and phosphate in soils are dependent, in part, on the distribution of various forms of Fe, Al, and Mn. The objectives of this study were to investigate (i) the distribution of various forms (exchangeable, organically bound, associated with Mn oxide, amorphou…
The effects of gas compression and Poisson's ratio on the compressive stress-strain curves of closed cell foams have been analysed. The contributions of hardening, polymer viscoelasticity, and gas escape on creep are examined. The foam diffusivity for air was predicted from the polymer permeability and the foam densit…
Using intermediate, liquid‐forming compositions in the (Y,La) 2 O 3 ‐AlN system as additives, fully dense Si 3 N 4 ceramics with high strength at high temperature have been obtained by pressureless sintering. The ceramics contain rod‐shaped β‐Si 3 N 4 with M′ or K′ solid solutions as grain‐boundary phases. The strengt…
The fabrication and operation of a pulse-doped diamond metal-semiconductor field-effect transistor (MESFET) is presented showing a usable source drain voltage of 70 V and no breakdown up to 100 V at 350/spl deg/C operating temperature. A channel sheet concentration of 8.5×10/sup 12/ cm/sup -2/ could be fully modulated…
The Reverse Monte Carlo (RMC) modelling technique produces a structural model which is only constrained to agree with the available experimental data. For simple disordered systems good, unbiased structural descriptions are produced in this way. However, in general, a good fit to the data is merely a necessary, not a…
A systematic description of theoretical eddy-current permeability spectra of infinitely long and wide slabs with 180/spl deg/ bar domains is made for the classical model, the Pry-Bean and Polivanov model concerning the eddy-current anomaly owing to domain wall displacements (DWD), as well as a model dealing with the a…
The propylethylenediamine moiety was anchored on silica in acid medium by using sol−gel methodology. A sequence of reactions was carried out with glutaraldehyde followed by ethylenediamine in order to increase the organic chain pendant groups covalently bonded to the inorganic support. All synthesized silicas were cha…
Electron probe x-ray microanalysis (EPMA) was used to measure water content (percent water) and dry weight elemental concentrations (in millimoles per kilogram) of Na, K, Cl, and Ca in axoplasm and mitochondria of rat optic and tibial nerve myelinated axons. Myelin and cytoplasm of glial cells were also analyzed. Each…
The elastic constants of the icosahedral boron crystals have been studied by the formulation of Born and Huang. First of all, a technique of symmetry decomposition has been developed for general crystals possessing molecular units in order to see the relaxation mechanism by the internal shift. It is proven that if a l…
Collagens, in addition to their structural role in the extracellular matrix, possess a number of functional binding domains. In this study, the binding to collagen of a monoclonal antibody is used as a model to define the molecular features involved in triple-helix interactions with other proteins. Here we report the…
Dry etching of PbZr X Ti 1- X O 3 (PZT) thin film capacitors with RuO X /Pt multilayered electrodes was studied to examine the etching effects. PZT films were deposited on RuO X /Pt/Ti/SiO 2 /Si substrates by sol–gel process and Pt films were prepared by DC magnetron sputtering. PZT and Pt thin films were etched with…