Materials Literature
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Small wires of W, Ag, and Pt were placed within an electrochemical microcell above single sulfide inclusions to detect the pH, sulfide, and thiosulfate, respectively. In chloride-free electrolytes the onset of sulfide dissolution was accompanied by a decrease in pH of 0.5 units to 4.2, a value that is not low enough t…
The material studied is a planar wire-grid network loaded with orthogonal capacitors and inductors. Over a ground plane and excited by a localized single-frequency source, this metamaterial exhibits conical high-field regions called "resonance cones." The cones exhibit specular reflection from boundaries and, with two…
Bis-[triethoxysilylpropyl]tetrasulfide (or bis-sulfur silane) and bis-[trimethoxysilylpropyl] amine (or bis-amino silane) were deposited on 2024-T3 aluminum alloy (AA 2024-T3). The structures of the films were characterized using Fourier-transform infrared spectroscopy (FTIR) and electrochemical impedance spectroscopy…
In this letter, we present a technique for calculating the Raman gain spectra of germanosilicate fibers from their index profiles. The gain spectra depend on radial profiles of the guided optical modes and the glass composition, in particular the distribution of Si-O-Si and Ge-O-Si bridging bonds. We have obtained spe…
This work presents a mathematical model for charge/discharge of electrochemical capacitors that explicitly accounts for particle-packing effects in a composite electrochemical capacitor consisting of hydrous nanoparticles dispersed within porous activated carbon. The model is also used to investigate the effect of non…
Magnetization of MnAs1−xSbx was measured as functions of temperature and magnetic field for 0≤x≤0.4. The entropy change caused by a magnetic field, ΔSmag, was estimated on the basis of the Maxwell relation. The ΔSmag for 0≤x≤0.3 in a field change of 5 T reaches 25–30 J/K kg, which exceeds that of other materials by a…
The water exchange process was accelerated for nine-coordinate, monohydrated macrocyclic GdIII complexes by inducing steric compression around the water binding site; the increased steric crowding was achieved by replacing an ethylene bridge of DOTA4- by a propylene bridge; in addition to the optimal water exchange ra…
The constitutive formulation of the finite-strain thermoelasticity is revisited within the thermodynamic framework and the multiplicative decomposition of the deformation gradient into its elastic and thermal parts. An appealing structure of the Helmholtz free energy is proposed. The corresponding stress response and…
Immersion plating of metals (Ag, Cu, Ni) onto a porous silicon (PS) layer from aqueous and nonaqueous solutions has been studied. The modified PS layers after the immersion plating were analyzed by X-ray diffraction and X-ray photoelectron spectroscopy. Fourier transform infrared spectroscopy and scanning electron mic…
Requirements for reduced NOx emissions have required that emissions reduction technologies move beyond combustion controls alone. Post combustion NOx control technologies that are being applied to coalfired utility boilers include selective non catalytic reduction (SNCR), selective catalytic reduction (SCR), and combi…
High quality ZnO thin films have been grown on a Si(100) substrate by plasma enhanced chemical vapor deposition using a zinc organic source [Zn(C2H5)2] and carbon dioxide (CO2) gas mixtures at the low temperature of 180 °C. The dependence of ZnO thin film quality on the gas flow rate ratio of Zn(C2H5)2 to CO2 (GFRRZC)…
Titanium containing ethane bridged hybrid mesoporous materials with uniform hexagonal arrangement are prepared by two different routes and characterized using several analytical techniques. The effect of substitution of bridged silsesquioxane precursors for siloxane precursors on the properties of resultant mesoporous…
Propionate CoA-transferase from Clostridium propionicum has been purified and the gene encoding the enzyme has been cloned and sequenced. The enzyme was rapidly and irreversibly inactivated by sodium borohydride or hydroxylamine in the presence of propionyl-CoA. The reduction of the thiol ester between a catalytic sit…
The syntheses, crystal structures and variable temperature (5–300 K) magnetic susceptibility measurements of two salen complexes of manganese(III) [where H2salen = N,N′-bis(salicylidene)-1,2-diaminoethane] having azido and dicyano argentate(I) as bridging ligands are reported. Both complexes belong to one-dimensional…
Vinyl benzene sulfonate (styrene sulfonate — VBS) and polystyrene sulfonate (PSS) are incorporated into layered double hydroxides (LDH) of nominal composition ZnnAl(OH)2(1+n)Cl·nH2O by exchange and templating reaction, respectively. PSS adsorption leads to a delamination process of the LDH 2D-host structure. A hydroth…
Cathodic electrodeposition is a promising route for electrochromic thin-film deposition. A new, simple, and fast method for preparing the deposition solution is described. Typically the solution consists in an equimolar mixture of 25 mM and acidified at pH 1.2 by perchloric acid addition. A film deposited at −0.24 V v…
A first-principles-derived approach is used to study structural, piezoelectric and dielectric properties of Pb(Zr 1 m x Ti x )O 3 (PZT) solid solutions near the morphotropic phase boundary at low temperature. Three ferroelectric phases are found to exist: a tetragonal phase for larger x compositions, a rhombohedral ph…
Different crystal forms of the analgesic drug ibuprofen were prepared and characterized in this study. Various conditions were used for the crystallization: crystallization was carried out using the solvent change method, the temperature change method, and the solvent evaporation method. Crystals were grown from diffe…
An improved synthesis of dithieno[3,2-b:2',3'-d]thiophene (DTT) and its 2,6- and 3,5-dibromo derivatives has been devised; Stille cross coupling of 2,5-(bistrimethylstannyl)-DTT afforded the oligomer 12.
The gadolinium-based manganite GdMnO3, partially substituted by calcium at the cationic site, has been investigated through its crystallochemical and magnetic properties. The Gd1−xCaxMnO3 solid solution crystallises in an orthorhombic perovskite-type structure (S.G. Pbnm) in the range 0 ≤ x ≤ 0.45. With increasing x,…