Materials Literature
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The practical application of the glycolysis mixture of polyurethane wastes is reported. It was found that in the presence of 4,4′-diphenylmethane diisocyanate (MDI) both the separated upper phase of the glycolysis mixture and the complete two-phase reaction mixture could be used as components of the urethane adhesive…
2-Methacryloyloxyethyl phosphorylcholine (MPC)-bonded chitosan was prepared by Michael addition of MPC to the amino groups of chitosan. The modified surfaces were characterized by static contact angle and electron spectroscopy for chemical analysis (ESCA). The water contact angle of chitosan decreased with the MPC bon…
Passive-to-active oxidation transitions in chemical vapor deposited (CVD) SiC under low total pressures (0.8-440 Pa) in the temperature range 1250-1700°C have been investigated. A mass spectrometer sampling system equipped with a xenon image furnace was used to detect the transition points. As the temperature increase…
Nominally pure BaF 2 single crystals were investigated at 77 v K with optical absorption and electron paramagnetic resonance to understand the mechanism of radiation damage. We find that X-irradiation at 77 v K of undoped BaF 2 produces V k - and F -centres having absorption bands at 3.4 and 2.3 v eV respectively.
The influence of hydrogen on the formation of porous in alkaline solution was investigated using an electrochemical measurement, a scanning electron microscope, and a grazing incident X-ray diffraction technique. The porous was not obtained on the surface of titanium in 5 M NaOH solution at 303 K for 3 h. When the tit…
The combustion of vanadium- and sodium-contaminated fuels in gas turbines provokes an accumulation of ash on metallic surfaces of the hot gas path. This ash material causes fouling and corrosion as a result of the formation of low melting point reactive compounds. This paper presents comparative investigations into th…
Crevice corrosion can initiate in a spontaneously active metal/electrolyte system even with some appreciable oxygen concentration in the crevice electrolyte, as indicated by the measured instantaneous milliampere current and active E x = L potential values at the bottom of the crevice. However, for crevice corrosion t…
The formation and evolution of the microstructure of casting are important research areas in the field of material science and engineering. The solidified microstructure of aluminum alloy was simulated by combining the CA (Cellular Automaton) model with macro heat transfer. A modified CA (MCA) model, which uses a more…
Some experiments were designed and performed in order to elucidate the mechanism of re-volatilization in silica traps using flame AAS. A water-cooled U-shaped silica trap and a slotted silica tube trap were used, while organic solvent aspiration was employed for re-volatilization. Analytes were Bi, Au, Mn, Cd and Pb.…
Aggregation states and electro-optical effects based on light scattering have been investigated for PVB/E44 and PMMABA/E44 composite films. The composite films were prepared by solvent-evaporation technique. Scanning electron microscopy observations showed that E44-phase is continuously embedded in a sponge-like PVB a…
The cell surface hydrophobicity of three strains of Escherichia coli cultured in liquid medium and on solid medium was measured using various methods including adsorption to pxylene, partition of cells in a polyethylene glycol/dextran (PEG/DEX) two phase system and contact angle measurements. The percentage adsorbed t…
A W-band (94 GHz) electron paramagnetic resonance (EPR) study of synthetic fluorapatite with 57 ± 4 ppm Gd has been made on single crystals at ~287 K. The spectra disclosed the presence of a previously unreported type of Gd 3+ center denoted by “b” herein (S = 7/2), in addition to the Gd 3+ center “a” assigned to the…
This study proposes a method to form ultrafine α‐Al 2 O 3 powders. Oleic acid is mixed with Al(OH) 3 gel. The gel is the precursor of the Al 2 O 3 . After it is mixed and aged, the mixture is calcined in a depleted oxygen atmosphere between 25° and 1100°C. Oleic acid evaporates and decomposes into carbon during the th…
Introduces phenomenological models of the spark ignition engine combustion and the three-way catalyst, able to describe the dynamic behaviors of the system in different operating modes, including the thermal transient, and being sufficiently simple for control synthesis. The models have been validated on experimental…
Coleus forskohlii (Willd.) Briq. is an important plant used against various disorders in indigenous systems of medicine, such as antiaging, antioxidant and as a remedy for heart, abdominal and respiratory disorders. In the present communication a detailed pharmacognostical study of roots of this plant procured from di…
Supercritical drying has been developed for the fabrication of nanostructures made of silicon or resist. Pattern collapse, which is a very serious problem in the fabrication of fine patterns, is related to the spacing, the aspect ratio and the surface tension of rinse solution. Among them, reducing the surface tension…
Abstract The crystal packing effects upon the static and dynamic first hyperpolarizability of 2‐methyl‐4‐nitroaniline (MNA) clusters have been addressed at the TDHF/AM1 level. Due to electrostatic interactions, in 1‐D arrays of MNA unit cells extending along the a crystallographic axis, the effective hyperpolarizabili…
Abstract An optically active spiropyran 1 with a binaphthol moiety as a chiral source was synthesized. The colored merocyanine form of ( R )‐ 1 obtained by the UV irradiation remained in the presence of D ‐amino acids longer than with L ‐amino acids. Chirality 14:713–715, 2002. © 2002 Wiley‐Liss, Inc.
Relaxor ferroelectrics are widely used in various applications because of their high dielectric and piezoelectric response over a wide range of temperature. The microscopic mechanism of the relaxor behavior, however, is highly complex and still inadequately understood. We discuss the atomistic mechanisms that create t…
The effect of boron, in the amounts of 0.26, 0.39, and 0.59 wt.%, on the volume fraction and structure of carbides in Cr white irons was examined. It was demonstrated that the addition of boron can change the microstructural characteristics of white iron containing about 13 wt.% Cr. With increasing boron content, the…