Materials Literature
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Films of γ-aminopropyltriethoxysilane (γ-APS), 1,2-bis[triethoxysilyl] ethane (BTSE) and their mixtures adsorbed onto pure aluminum from aqueous solutions were characterized by means of ellipsometry, infrared spectroscopy (IR) and X-ray photoelectron spectroscopy (XPS). It was found that after hydrolysis in water the…
Nanocrystalline tetragonal‐BaTiO 3 powder was prepared using a hydrothermal method, under moderate conditions, and with a high precursor concentration. Characterization via X‐ray diffractometry and differential scanning calorimetry confirmed that the average particle size and tetragonal content of the prepared powder…
An electrochemical procedure is described for the anodic deposition of CuO thin films from solution precursors at 25-30°C in an alkaline medium The deposition bath was similar to Fehling's solution using tartrate ions as a complexing agent for Cu(II). Cupric oxide deposited onto a platinum substrate at an anodic curre…
Novel long-period hexagonal structures with six and fourteen layered atomic configurations were formed in melt-spun Mg97Ln2Zn1 (Ln=Y, Gd and Sm) ternary alloys annealed at 573 K for 1.2-3.6 ks and in an as-spun Mg97Y2Zn1 alloy, respectively. The Mg-based alloys containing La or Ce as the Ln element have a mixed struct…
It is well established that near-infrared (NIR) combination bands at 4500 and 5200 cm−1 can be used to measure the concentrations of OH groups and H2O molecules, respectively, in hydrous silicate glasses at room temperature. However, the variations of hydrous species concentrations and molar absorption coefficients fo…
Practical applications of wood based composites are limited by the hydrophilic nature of cellulose, which causes dispersion and moisture absorption problems. This work rests on the effects of wood treatment on the mechanical properties of composites made with wood flour and polypropylene (WF/PP). Two different fiber t…
Potentiostatic polarization experiments were performed as a function of potential (200 to 700 mV Ag / AgCl ) and temperature (25-85°C) on the Ni-Cr-Mo alloys C22 and C276. X-ray photoelectron spectroscopy (XPS) and time-of-flight secondary ion mass spectrometry (TOF SIMS) were used to determine the chemical compositio…
Molybdenum(VI)–cis-dioxo complexes bearing sugar derived chiral Schiff-base ligands of general formula MoO2(L)(Solv) have been synthesized (with L = N-salicylidene-D-glucosamine; N-salicylidene-1,3,4,6-tetraacetyl-α-D-glucosamine; N-5-chlorosalicylaldehyde-1,3,4,6-tetraacetyl-α-D-glucosamine; N-salicylaldehyde-1,3,4,6…
Poly (vinyl alcohol)-chitosan blend films were prepared by casting the respective polymer solutions. The glutaraldehyde was used as a cross-linking agent. A series of PVA-chitosan blends were prepared by varying the ratio of the constituents. Mechanical and physical properties of blended films such as tensile properti…
Two meso-tetraphenylporphyrin derivatives bearing adjacent: 5,10-di[4-(N-trimethylaminophenyl)-15,20-diphenylporphyrin (DADP-a) or opposite: 5,15-di[4-(N-trimethylaminophenyl)-10,20-diphenylporphyrin (DADP-o) cationic-N-(CH3)3+ groups on two of the para-phenyl positions were examined with regard to photodynamic proper…
Our works on discotic liquid crystalline semiconductors are reviewed. Some of them show very fast carrier mobilities. Novel sandwich rare earth metal complex, bis[octakis(alkylthio)phthalocyaninato]lutetium(III), shows a mobility of 0.71 cm 2 /Vs, which is the fastest in liquid crystals at the present time, so far as…
The biosynthesis of poly(3-hydroxyalkanoate) (PHA) from waste edible oils and tallow by Ralstonia eutropha was investigated. Waste plant oils as well as waste tallow were assimilated and successfully converted to PHA with relatively high yield by the bacterial fermentation. The waste plant oils usually gave poly(3-hyd…
We demonstrate the existence of multiple active oxygenating species in porphyrin and corrole-catalyzed competitive epoxidations of styrene and cis-cyclooctene.
We report here a method that can easily prepare large quantities of solubilized carbon nanotubes. The solubilized carbon nanotubes prepared by the method were characterized and their solubilities in a variety of organic solvents as well as the percentage content of tubes in the solubilized samples was determined.
The 9Cr-ODS martensitic steel claddings were developed by cold-rolling and subsequent heat-treatment. The standard chemical composition is Fe-0.13C-9Cr-2W-0.2Ti-0.35Y2O3. The substantially elongated grains formed by cold-rolling turned out to be into equi-axied grains by ferrite to austenite phase transformation at th…
We conducted X-ray diffraction study of YMn 2 O 5 single crystals with an orbital--radiation X-ray source to determine the lattice distortions related to the ferroelectric phase transition. At present, no anomaly of temperature dependence of lattice parameters has been detected around the ferroelectric transition poin…
Crystalline carbon nitride powder has been successfully prepared via the liquid–solid reaction between anhydrous C3N3Cl3 and Li3N in benzene at 355 °C and 5–6 MPa for 12 h. X-Ray diffraction (XRD) indicated that the major part of our brown sample was composed mainly of α-C3N4 and β-C3N4 with lattice parameters of a =…
We formulate a model describing rate-independent hysteretic response of shape-memory alloys under slow external forcing. Under natural assumptions we prove that this model has a solution. The microstructure is treated on a "mesoscopic" level, described by volume fractions of particular phases in terms of Young measure…
We report herein on the oxidation kinetics and morphology of the oxide phases that form after long term (up to 1500 h) oxidation in ambient air of fine and coarse-grained samples of with 30 vol % TiC and with 30 vol % SiC in the 875-1200°C temperature range. In all cases, the oxidation resulted in a duplex scale, an o…
An overview on recent progress in grain boundary (GB) diffusion study is presented with emphasis on physical phenomena encountered in GB diffusion experiments such as the linear and non-linear segregation effects. Systematic investigations on pure and alloyed poly- and bicrystals gave conclusive information on the sol…