Materials Literature
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A new series of dendrimers containing a central cavitand core with four appended Fréchet-type dendrons, linked to the core through 4,4'-bipyridinium (viologen) subunits, have been synthesized, characterized and their electrochemical properties investigated using cyclic voltammetric measurements.
A sharp luminescence peak from Sm doped ZnS at 650 nm which can be assigned as 4G5/2–6H9/2 transition of Sm3+ ion was observed; however, no luminescence peak related to Eu3+, which can have luminescence in the similar spectral region, was observed from Eu doped ZnS. A defect level situated at about 0.36 eV above the v…
In order to investigate the effect of deuteration on the ferroelectric properties of glycine phosphite, single crystals with various deuteration ratio x (0 ∼ 0.78) have been prepared. The crystal form is not affected by the deuteration. Internal bias fields influenced hysteresis loops in all samples cut from crystals.…
We report on the observation of precursor effects of the rhombohedral-to-cubic phase transition in Indium Selenide (InSe) with several experimental techniques. The pressure at which these precursor defects are first observed depends on the sensitivity of the experimental technique. In transport measurements, which are…
A new technique by XAFS (X-ray Absorption Fine Structures) and XANES (X-ray Absorption Near Edge Structures) has been developed for in situ observation of metal corrosion. XAFS and XANES spectra were obtained with a special electrochemical cell to elucidate pitting for stainless steel. A sheet of stainless steel was a…
The free-base and titanyl (Ti(IV)O) complexes of meso-tetratolyl- and meso-tetra(3,5-xylyl)hydroporphyrins were synthesized and characterized. Metalation of the hydroporphyrins with titanium was achieved by reaction of the lithium salts of the hydroporphyrin with TiCl(4). Other methods used to metalate porphyrins with…
The surface treatment of glass beads, chosen as model filler, is carried out using four kinds of silane coupling agents with multilayer coverage. For this purpose, the silanes having aminopropyl or methacryloxypropyl group as an organofunctional group with two or three alkoxy group numbers are used. The amount of sila…
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…