Materials Literature
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The internal friction (Q−1), elastic modulus (E) and electrical resistance (R) of γ-MnFe based alloys were measured as the function of temperature. It was found that in the alloys with Mn-content (x) ranging from 0.4 to 0.6 in atomic fraction, the R–T curves turn up and there is no obvious anomaly in Q−1 and E curves,…
Magnetic and transport measurements have been performed on La0.7Sr0.3Mn1−xMxO3 (M = Cr, Ti) in order to study the influence of the substitution on the Mn-site on the magnetotransport properties in the La0.7Sr0.3MnO3 perovskite-like compound. Polycrystalline samples were prepared by a conventional solid-state reaction…
New conditions of synthesis Ca-chlorapatite and K-Ca-chlorapatite by using the melt salts method were determined. The results of X-ray diffraction show that the compound Ca-chlorapatite crystallizes in the hexagonal system (space group P63/m) with the crystallo-graphic parameters (a = b = 9.6228(3) Å and c = 6.7610(3)…
Abstract Rigid polyurethanes were synthesized using hydroxy alkylated cardanol formaldehyde and hydroxy alkylated dimerized‐cardanol formaldehyde resins and dicyclo hexyl methane diisocyanate. The studies on the aging (hydrolytic stability, absorption of water/toluene, chemical resistance, dimensional stability, and t…
Abstract Polyindole films prepared by potentiostatic growth in dichloromethane solution were subjected to overoxidation studies in aqueous media. Overoxidation at potentials greater than 1.1 V (vs. SCE) in 0.1 M KNO 3 or 0.1 M H 2 SO 4 was possible. Overoxidation in 0.1 M NaOH resulted in mechanically unstable films w…
Fluoropolymer composite films with nanoporous morphology and dielectric constants less than 2.0, consisting of plasma‐polymerized allylpentafluorobenzene (pp‐APFB) nanospheres and magnetron sputter‐deposited poly(tetrafluoroethylene) (s‐PTFE) dense layers, have been prepared on hydrogen‐terminated Si(100) (H‐Si) subst…
Trolox (synthetic, hydrosoluble phenolic derivative of vitamin E, used as an active in cosmetic products) can undergo photooxidation upon UVB and UVA irradiation, the main degradation intermediate being Trolox C quinone. Trolox photodegradation rate decreases with decreasing polarity of the solvent, most likely becaus…
We have studied the interaction of atomic hydrogen with (5,5) and (10,0) single-walled carbon nanotubes (SWNT) using density functional theory. These calculations use Gaussian orbitals and periodic boundary conditions. We compare results from the local spin density approximation, generalized gradient approximation (GG…
Abstract Summary: The effects of a reversible chemical reaction on morphology and dynamics of phase separating binary mixtures with viscosity difference are studied by numerically solving modified time‐dependent Ginzburg‐Landau and Navier‐Stokes equations. Much more interesting morphologies are observed in the system…
Abstract Summary: Monte Carlo simulation utilizing the bond fluctuation model in conjunction with single and configurational biased Monte Carlo moves is used to study the adsorption of diblock (A‐ block ‐B) and alternating (A‐ alt ‐B) copolymers at flat, chemically heterogeneous surfaces comprising C and D domains. Th…
A high activity and large capacity of hydrogen storage alloy Mg2Ni by hydriding combustion synthesis was investigated by means of pressure composition isotherms, X-ray diffraction and scanning electron microscopy. The results showed that the maximum hydrogen absorption capacity of Mg2Ni is 3.25 mass fraction at 523 K,…
Thermal oxidation of Fe 2+ in tourmalines of the schorl-dravite series induced by gradual annealing of powdered samples in air above 600°C was studied using X-ray diffraction and Mossbauer spectroscopy. The a unit-cell parameter distinctly decreases, while the c parameter even slightly increases during the oxidation a…
High-resolution x-ray photoelectron spectroscopy has been used to study the kinetics of the CO oxidation reaction on a Pt(111) surface in situ. The study focuses on the interaction of a preadsorbed p(2x2) layer of atomic oxygen with CO dosed using a supersonic molecular beam. Measurements of O 1s and C 1s spectra at 1…
Thin films of SmNiO3 were grown on LaAlO3 (012) substrates using the injection-MOCVD process, a method which has been in the past successfully applied to the growth of high-quality epitaxial oxide thin films. Our investigation of as-deposited films by X-ray diffraction allows concluding on the presence of a pure SmNiO…
Abstract Summary: An amino‐functionalized bipyridine ligand was prepared in order to serve as a bridging unit to an activated low‐molecular‐weight monomethyl ether of poly(ethylene glycol) (PEG). Coordination of a ruthenium( II ) phenantroline precursor onto the formed PEG‐containing bipyridine ligand yielded a metal‐…
The accumulation of organic matter in volcanic soils may modify their properties and characteristics. Soil complexity makes difficult to assign the relative importance of organic matter in determining soil behavior. If changes in soil properties can be associated with the soil organic carbon (OC) content, a better und…
In this study, water dispersed paints were produced using polyester polyol, isophorone diisocyanate (IPDI) and hydrophilic monomers. Two sets of experiments were performed. In the first group, the effects of various proportions of the hydrophilic monomers dimethylol propionic acid (DMPA) and tartaric acid (TA) on the…
We attempted to purify ATP citrate lyase (ACL) from Hydrogenobacter thermophilus by following the citrate-, ATP- and CoA-dependent formation of an acyl-CoA species that was detected as hydroxamate. However, citryl-CoA rather than acetyl-CoA was found, indicating that the purified enzyme was a novel citryl-CoA syntheta…
Thin films of Co2MnSi have been grown on a-plane sapphire substrates from three elemental targets by do magnetron cosputtering. These films are single phase, have a strong (110) texture, and a, saturation magnetization of 4.95mu(B)/formula unit at 10 K. Films grown at the highest substrate temperature of 715 K showed…
Wet-chemical analyses (41) of tourmaline from granitic pegmatites (barren, barren-pocket, beryl, lepidolite types) in the Moldanubicum, Czech Republic revealed that members of the oxy-subgroup ĄV common oxy-schorl, minor oxy-dravite and rare oxy-foitite are more abundant relative to the relevant members of the hydroxy…