Materials Literature
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Nearly monodispersed tin/tin oxide core/shell nanoparticles were prepared by a reverse microemulsion technique. A phenanthroline–tin chloride complex was used in an optimized microemulsion system to obtain small particle size and good size control (mean = 3.2 nm, standard deviation = 0.5 nm). Preparation in the absenc…
Freestanding anodic aluminum oxide (AAO) membranes were fabricated using a two-step anodization procedure, voltage reduction method, and inductively coupled plasma polymerization. The fabrication process was monitored with electrochemical and spectroscopic ellipsometry measurements, X-ray photoelectron spectroscopy, F…
Abstract Hartree–Fock (HF) and density functional (DFT) LCAO calculations of single (2D) and periodical (3D) slab models of MgO crystal are presented. HF and DFT methods produce very close results for the surface energy and electrostatic potential and exhibit the same convergence properties, with the slab thickness in…
We propose a new method for the kinetic treatment of self-discharge of intercalation electrodes based on a combination of cyclic voltammetry (CV) and chronopotentiometry under net zero current conditions. This was applied to composite graphite electrodes in 1 M dimethyl polycarbonate at four different temperatures fro…
In the present work, reactions occurring between molten iron containing varying amounts of oxygen and mullite substrate were investigated through optical Sessile drop experiments. The reactions were followed in static as well as dynamic modes through contact angle measurements. Further, the reactions were followed as…
The thermal fatigue (TF) behavior of a new type high-Cr cast hot work die steel was investigated. The results indicate that TF cracks initiate at the grain boundaries or at the interface between inclusion and matrix, which had been oxidized, and then propagated along the grain boundaries. The thermal fatigue crack ini…
Luminescent nanocrystalline (NC) Ce3+-doped yttrium aluminum garnet (Y3Al5O12:Ce–YAG:Ce) is prepared by a combustion synthesis technique that yields a highly porous three-dimensional network of interconnected 18 nm nanocrystals. Tetramethyl rhodamine isothiocyanate (TRITC) was conjugated to NC YAG:Ce by using glycine…
Despite the fact that the influence of metal chemistry on metal uptake in marine phytoplankton has been well studied, the effects of physiological processes such as cellular growth remain less well known. In this study, the cell-specific growth rate of the coastal diatom Thalassiosira pseudonana (Clone-3H) was modifie…
The melting behavior of isothermally crystallized it‐1‐butene/ethylene copolymers with different ethylene content has been investigated by differential scanning calorimetry (DSC) and simultaneous small‐ and wide‐angle x‐ray diffraction (SAXS/WAXS) using synchrotron radiation. A very important influence of the aging ti…
Water molecules are interspersed within ribbons of face-sharing [PbI6/2−]∞ octahedra within the title hybrid phase in which the stacks of organic radical cations are less strongly dimerised and interact more with each other than is usually the case in β′ phases to achieve metallic conductivity at ambient pressure.
Two new mixed-metal sandwich complexes [M(II)2(H2O)2Fe(III)2(P2W15O56)2]14- (abbreviated [M2Fe2P4W30], M(II) = Co(II), Mn(II)) were obtained at pH 3 by addition of M2+ to [Na2(H2O)2Fe(III)2(P2W15O56)2]16- (abbreviated [Na2Fe2P4W30]) without substitution in the alpha-[P2W15O56]12- (abbreviated [P2W15]) units. Their X-r…
A magnetically coupled Cu(II)36 aggregate forms around a potassium chloride unit.
In order to achieve the required low reactor mass per unit electrical power for space reactors, refractory alloys are essential due to their high operating temperature capability that in turn enables high thermal conversion efficiencies. One of the key issues associated with refractory alloys is their performance in a…
The short-term responses of articular cartilage to mechanical injury have important implications for prevention and treatment of degenerative disease. Cell and matrix responses were monitored for 11 days following injurious compression of cartilage in osteochondral explants. Injury was applied as a single ramp compres…
The idea of sustainability has become one of the major topics in industry and politics and probably represents one of the mega-trends of the early 21st Century. Due to outdated processes and methods applied in the leather industry, the waste products and the significant amounts of process water used oppose more and mo…
Wet dispersion mechanism of manometer-sized silica powder was investigated in a verticaltype beads mill using fine zirconium oxide (zirconia) beads. Zirconia beads of various sizes were used to disperse coagulated silica powders in nanometer size. The dispersed particles were measured by TEM and a dynamic light scatte…
The ecological success of marine diatoms comes despite their unusual additional requirement for silicon, a nutrient that often limits their growth in the ocean. There may be, however, some physiological and ecological advantages to silicon limitation. A model of nitrogen and silicon metabolism in diatoms (Flynn et al.…
Removal of nitrogen oxides (NOx) using an ozonization and catalysis hybrid process was investigated. The role of the ozonization in the hybrid process is to increase NO2 content by oxidizing a part of NO, thereby leading to improving the performance of the catalytic reduction. It was found that the rate of the oxidati…
Various kinds of ZrO2-ZrW2O8 composite ceramics were successfully prepared by cosintering of ZrO2 and ZrW2O8 mixture with various ratios at 1200°C. The thermal expansion coefficient of the composite could be controlled from -9.6×10-6 K-1-8.2×10-6 K-1 by varying ZrO2/ZrW2O8 ratios and zero thermal expansion was observe…
The present paper summarises theoretical and experimental work undertaken to develop a hardfacing product designated '167Nb-S'. This material, which is based on the Fe-Cr-Nb-C system, was designed for cladding components subjected to severe abrasive wear by submerged arc welding. The work undertaken includes microstru…