Materials Literature
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Sputtered-deposited nickel titanium thin films are commonly amorphous when synthesized and require annealing to crystallize them. The resulting microstructures, which are governed by nucleation and growth kinetics, dictate the actuation properties. The evolution of these microstructures was studied using in situ trans…
Digital photography is used to follow corrosion-driven delamination at 95% relative humidity when NaCl contacts an artificial coating defect on carbon steel loaded with an emeraldine salt (ES) of polyaniline (PAni) base layer and polyacrylate overlayer. Changes in the optical properties of the PAni layer reveal delami…
Aseries of aqueous anionic polyurethane dispersions with ionic groups in the soft segments were synthesized from a polyether glycol, maleic anhydride modified castor oil, isophorone diisocyanate, and α,α-dimethylol propionic acid according to the prepolymer mixing process. Samples were neutralized by the addition of t…
Nanometallic iron and aluminium, along with hydrogen and electricity, are among the proposed alternatives to the petroleum-based fuels for future transportation. The advantages of the metallic fuels appear to be high volumetric energy densities and zero greenhouse gas emissions during the operation of the vehicle. How…
It is well known that the electric and thermal conductivities of materials depend largely on their crystal orientation. Meanwhile, the imposition of a high magnetic field is a very effective method of obtaining highly crystal-aligned structures. Recently, thermoelectric materials, that is, materials which can directly…
Three strains of Azotobacter chroococcum were studied to produce poly-β hydroxybutyrate as a inclusion body by whey degradation. Optimum degradation whey results were obtained when using whey broth as a fermentation medium without extra salt, temperature at 35 °C and pH 7 (P<0.05). Lambda max for whey broth med…
B‐rich nanowires are grown on Ni coated oxidized Si(111) substrate using diborane as the gas precursor in a CVD process at 20 torr and 900C∘. These nanowires have diameters around 20–100 nanometers and lengths up to microns. Icosahedron B 12 is shown to be the basic building unit forming the amorphous B‐rich nanowires…
Two PHA synthase phaC1 and phaC2 genes cloned from the new strain Pseudomonas putida KCTC1639 were metabolically engineered for the overproduction of medium-chain-length polyhydroxyalkanoate (mcl-PHA). The overexpressed phaC1 and phaC2 genes in P. putida KCTC1639 were compared in terms of the biosynthesis of mcl-PHA,…
Reactions between the metal(II) salts [M(CH3CN)n](BF4)2 (M = Fe, n = 6; M = Mn, n = 4) and some organic anionic polynitriles were studied. With the pentacyanopropenide anion pcp− [pcp− = (NC)2CC(CN)C(CN)2−], were obtained, according to the experimental conditions, the new complexes [M(pcp)2(H2O)4] (1, M = Fe; 2, M = M…
Residual stress of thin diamond films deposited by chemical vapor deposition (CVD) method was measured using a new method for residual stress measurement we developed. Compressive residual stresses of CVD diamond films were determined from the height and diameter of protuberance of film delaminated by pulse laser spal…
We have investigated in situ and in real-time the formation process of anodic porous alumina on silicon using infrared absorption spectroscopy in the multiple internal reflection geometry (MIR-IRAS). We have collected IR absorption spectra of the interface between a porous alumina film and a Si substrate to elucidate…
Cf/SiC composite was brazed to Ti-alloy by using interlayer of Ag-Cu-Ti-C mixed powder. Microstructure and both the room temperature and 500°C shear strengths of the brazed joint were investigated. In situ synthesized TiCx (x≤1) is formed in the brazing layer of the joint by the reaction of C and Ti in the brazing lay…
A thermodynamic evaluation was performed to predict phase separation in multi-component oxide glasses. Composition ranges for metastable liquid–liquid immiscibility and spinodal decomposition in a SiO2–CaO–MgO–Na2O quaternary system were calculated on the assumption that glasses in the oxide system can be regarded as…
Individual perovskite-like LaCoO 3 obtained by the citrate method and LaCoO 3 supported onto the mesoporous molecular sieve MSM-41 have been characterized by X-ray powder diffraction, EPMA, low-temperature nitrogen adsorption, H 2 TPR, and EXAFS. The catalytic activity of the supported cobaltate in methanol oxidation…
In this study the thermal partial oxidation (TPOX) of Diesel fuel for the production of syngas was investigated theoretically and experimentally. Equilibrium and kinetic calculations were performed to determine the main influence parameters on the thermal partial oxidation. In the experimental study, a high-temperatur…
The crystal chemistry of the new mineral dissakisite-(La), the Mg-analogue of allanite-(La) with ideal formula CaLaAl 2 MgSi 3 O 12 (OH), was studied by single-crystal X-ray diffraction and Mössbauer spectroscopy. Diffraction data indicated that it has a partially metamict state with expanded cell parameters a = 8.959…
The first part of the paper deals with the computation of stress intensity factors for pyramidal indentation cracks with a ratio of crack length c to indentation half-diagonal a between 1 and 2. The residual stress field due to quasi-plastic deformation below the indenter is described by using the Hill model of an exp…
Mixtures of chrysotile (Mg6Si4O10(OH)8) and CaCO3 were burned at temperatures ranging from 500°C to 1000°C; the decomposition temperature of chrysotile was lowered by adding CaCl2. Thermal analysis and succeeding SEM observation confirmed the formation of melts, which was supposed to be responsible for the effect of t…
The FTIR spectra of poly(ether imide) films prepared from their chloroform solutions were recorded in a wide temperature interval. The cast films were shown to contain residual solvent. This residual solvent existed in films as unbound chloroform that may be removed by heating to 60–70°C and as bound chloroform that i…
Novel silicon-deficient mullite (Al5.65Si0.35O9.175) single crystal nanowires were synthesized in large quantities on mica substrates assisted by the intermediate fluoride species. The nanowires have diameters in the range 50-100 nm and typical lengths of several microm. Aligned nanowires were observed at the substrat…