Materials Literature
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Grain growth rates in sputtered Cu thin films were found to be influenced by impurity levels of the sputtering targets. The Cu thin films with thickness of 100 nm or 1 μm were deposited on the rigid substrates by a sputter-deposition technique using the Cu target with purity of 99.99% (4N) or 99.9999% (6N), then subse…
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Chalcogenide glasses in the system AsxSe100-x, as well as As40Se60 and As50Se50 glasses doped with metals (Bi, Ge, Cd, Ag, Sn, Mn, Dy and Sm) were investigated by Raman spectroscopy. The Raman spectra of AsxSe100-x with 0x10 suggest that the majority building units are Se chains and Se8 closed rings. At higher As cont…
A photo-crystallographic study of Fe(btr) 2 (NCS) 2 ·H 2 O was performed in order to describe the modification of structures and charge densities on going from the ground low spin (LS) state to the metastable high spin (HS) state during the LIESST phenomenon at 15 K. Related photo-magnetic and spectroscopic measuremen…
The chemical polymerization of aniline was performed in phenylphosphinic acid (APP) medium using ammonium peroxidisulfate as the oxidizing agent, at 0 ?C and 25 ?C. The yield of polyaniline (PANI) was about 60?69 %. The polymerization process required an induction time 8?10 times greater than in other acids (hydrochlo…
In this paper the difference between the mechanical properties of woven and nonwoven fabrics is presented, and the important role of constructional parameters (particular the cover factor) of reinforcement fabric in the compound fabric is stressed. Some basic mechanical properties, such as tensile strength, elongation…
PtCo alloy nanoparticles with different metal elemental ratios (Pt/Co = 0.9, 1.6, 2.9, and 3.6) were prepared by a novel synthetic approach, using the transformation reaction of platinum(IV)/cobalt tetracyanoplatinate metal coordination nano-polymers (Pt(II)-CN-Pt(IV)/Co)via a H2 gas-phase reduction.
Recently, the global scale environmental problem has become a critical issue. In metallic material, not only the cost reduction and improvement of mechanical properties but also the decrease in environmental load is required. In copper alloys, several mass% Pb was added to improve the machinability. However, due to th…
Alkali-retting was applied to kenaf bast ribbons and the mechanical properties and the structure of the retted fibers were investigated. In order to produce the fibers with preferable surface smoothness, the retting should be made at the NaOH concentration higher than 4 %. The tensile properties, however, showed a max…
Field emission from nanostructured carbon materials is analyzed by applying the model of emission center in which the emitting surface contains two phases of carbon having substantially different electronic properties. In accordance with this model, the proposed mechanism involves electron tunneling through two potent…
Zinc oxide films were fabricated by a homemade spray pyrolysis system equipped with an optical setup ensuring the in situ control of the film growth. Zinc acetate (0.1 M) diluted in a mixture of ethanol and water was used as the precursor solution. The ethanol-water molar ratio, gamma, in the precursor solution was va…
Abstract A ternary hybrid of bismaleimide‐polyetherimide‐silica (BMI‐PEI‐SiO 2 ) was synthesized by sol‐gel reaction and characterized by scanning electron microscopy (SEM), energy dispersive X‐ray analysis (EDX), thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). The results indicated that…
This work studies the influence of the climatic conditions during the Canadian winter using high-density PE (HDPE) samples exposed to weather conditions during different periods of time. Under these conditions, it is reasonable to think that the chemical changes caused by the climatic degradation will at first sight b…
The taxonomic and environmental characteristics of the diatom flora found in three bodies of water in the wetlands of Jilotepec-Ixtlahuaca, Estado de Mexico are described. Six samplings were made (January-October, 2001). Benthic and planktonic diatoms growth were collected.The samples were analyzed with a Light Micros…
Spectroscopic data on crystals of rare-earth compounds having structural instability due to the cooperative Jahn–Teller effect are reviewed. Based on an analysis of these data, it is inferred that the dynamic coupling of low-frequency electronic excitations of the rare-earth ions with crystal lattice vibrations plays…
The latest PIE results of Zry-2 and HiFi alloy (0.4 %Fe-Zry2) showed that iron addition reduces the hydrogen pick-up ratio. In order to clarify this lower hydrogen absorption mechanism, three types of experiments were carried out for both alloys: (1) Measurements of the hydrogen pick-up ratio in the pre-transition reg…
The microstructures of four kinds of Zircaloy-2-type materials with neutron exposure up to about 15 × 1025 n/m2 (E>1MeV) were examined to investigate the microstructural evolution and to correlate it with the in-reactor corrosion behavior at very high fluences. The materials examined in this study included two…
Recuperation increases the efficiency of a gas turbine engine by extracting heat from the exhaust gas stream and using it to pre-heat the compressor discharge air. High temperature oxidation and creep are major concerns, necessitating the use of heat-resistant alloys for the recuperator panels. Most current recuperato…
An attempt to improve the durability of the flame retardancy to washing of water soluble phosphate-based flame retardant on cotton fabric was studied. In this study, the poorly substantive phosphate treated fabric was further padded with chitosan solution. After drying, the chitosan formed film layer covering the fabr…
Supercritical carbon dioxide (scCO2) was utilized to impregnate ethyl methacrylate (EMA) and propyl methacrylate (PMA) monomers within an Ultra High Molecular Weight Polyethylene (UHMWPE) matrix where they were subsequently copolymerised in situ. The ratio of EMA to PMA was varied in the monomer feedstock in order to…