Materials Literature
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The excited-state properties, including singlet oxygen quantum yields, of a series of metallotexaphyrins (M-Tex), containing coordinated paramagnetic and also diamagnetic lanthanide(III) and other cations, are reported as are the solution-phase magnetic susceptibilities of the paramagnetic species. It is found that th…
Owing to its importance in understanding the mechanical and thermomechanical behaviours of shape memory alloys (SMAS). the deformation mechanism of martensitic twins has been of continuous research interest. Several deformation steps have been distinguished in accordance with the stress–strain curves, and some explana…
The lactoperoxidase (LP) system is a natural antimicrobial system, the use of which has been suggested as a preservative in foods and pharmaceuticals. The effect of adding iodide to the LP system, the chemical stability and the change in antimicrobial effectiveness during storage was studied. Addition of iodide with t…
Porous polytetrafluoroethylene (PTFE) films were positively or negatively corona charged at room or elevated temperatures. Their charge storage behavior was investigated by means of isothermal surface potential measurements in direct comparison to nominally nonporous samples of the same polymer. It was found that poro…
The Templated Grain Growth (TGG) of Al 2 O 3 occurs in three stages: densification, radial growth of individual template grains until template impingement, and template grain thickening. Significant template growth occurs only after densification to ∼90% density. Template loading determines the inter‐template spacing…
The atomic and electronic structures of two phases of titanium dioxide, anatase and rutile, have been investigated by a first-principles pseudopotential method based on local density approximation in density functional theory. The calculated band structure, equilibrium lattice constants, and bulk modulus of rutile are…
Strontium is one of the most common substituents in apatite; the presence and behavior of Sr in apatite-group phases are of considerable significance in geology, materials science and biology. The atomic arrangements in strontian fluorapatite (1.18 Sr atoms per 10 Ca sites) and belovite-(Ce) [ideally Sr 6(REE2Na2)(PO4…
The aim of this work is to study the structural characteristics and properties of the solid solution (Al,Cr) 2 O 3 . XRD analysis, 27 Al MAS‐NMR measurements, and microstructural characterization were used to determine the relationship between color and crystallochemical properties of the compounds formed. In particul…
In this work we present electrical resistivity, magnetic susceptibility, and electron spin resonance data at high temperature of the ${\mathrm{Sr}}_{2}{\mathrm{FeMoO}}_{6}$ double perovskite. We found between 300 K and 900 K two metal-insulator transition temperatures at ${T}_{c}\ensuremath{\approx}405$ K and $\ensure…
The applications of magnesium alloys for designing aerospace structure systems are focused in this paper. As the material properties of magnesium alloys have advantages of light weight, high specific stiffness, and high damping characteristics, they are supposed to be advantageous for designing light-weight aerospace…
Atomistic simulations with atomic potentials including anion polarizibility have been performed for the low‐index surfaces of spinel MgAl 2 O 4 with various terminations. The calculations show that for the most stable surface the surface energy is 2.27 J/m 2 for the {100}, about 2.85 J/m 2 for the {110}, and 3.07 J/m…
Among the light metal alloys, magnesium is the lightest structural material with a density of 1.74 g/cm 3 and many attractive physical and mechanical properties combined with processing advantages. Therefore, it represents a very attractive material for a large amount of applications from main user automotive industry…
Resin composition, silicate filler modification, and curing agents were varied systematically in order to improve the performance of anhydride-cured epoxy nanocomposites based upon organoclay. The filler component was fluorohectorite which was rendered organophilic by means of cation exchange of intergallery sodium ca…
We report formation of single‐ and two‐phase glasses from rare‐earth oxide–alumina materials. Liquids with the Y 3 Al 5 O 12 and Er 3 Al 5 O 12 compositions underwent a liquid–liquid phase transition which resulted in glasses with a cloudy appearance due to spheroids of one glass in a matrix of a second glass. The two…
Abstract Area-weighted thickness distributions of fundamental illite particles for samples of illite and illite-smectite from seven locations (including bentonites and hydrothermally altered pyroclastics) were measured by Pt-shadowing technique, by transmission electron microscopy. Most thickness distributions are des…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTPhotoswitching of Intramolecular Magnetic Interaction Using a Photochromic Spin Coupler: An ESR StudyKenji Matsuda and Masahiro IrieView Author Information Department of Chemistry and Biochemistry Graduate School of Engineering, Kyushu University CREST, Japan Science a…
The gene for a 104-kDa exocellulase, Cel48A, formerly E6, was cloned from Thermobifida fusca into Escherichia coli and Streptomyces lividans. The DNA sequence revealed a type II cellulose-binding domain at the N-terminus, followed by a FNIII-like domain and ending with a glycosyl hydrolase Family 48 catalytic domain.…
Recent years have witnessed increasing interest in the synthesis of low-symmetry single phthalocyanines (Pcs) since they may show, among other applications and advantages, interesting second-order nonlinear optical (NLO) properties. This potential of unsymmetrically substituted and regioisomerically pure phthalocyanin…
Tb 3+ and Eu3+ were codoped in zeolite-Y. Their photoluminescence and photostimulated luminescence were investigated. Due to the dissipation of excitation energy by OH vibrations, the luminescence from the hydrated zeolite containing Tb3+ and Eu3+ prepared at room temperature is very weak. However, the luminescence is…
Powders of nanocrystalline zirconia doped with 3–30 mol% alumina have been synthesized using chemical vapor synthesis (CVS). Dense or mesoporous ceramics of small and narrowly distributed grain and pore sizes in the nanometer range are obtained via pressureless vacuum sintering. The microstructural development of the…