Materials Literature
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Recent results regarding the formation of co-deposits, fuel accumulation and overall material transport at the TEXTOR tokamak are described. Two categories of brittle flaking co-deposits were identified: ( i ) smooth stratified layers of a thickness of up to 50 µm and a fuel content of up to 16 at.% , ( ii ) granular…
While thymine or N6-(4-methoxybenzoyl)adenine terminated bis(4-alkoxy)-substituted bis(phenylethynyl)benzene monomers show no liquid crystalline behaviour by themselves, mixing the complementary nucleobase monomers together results in the formation of thermotropic liquid crystalline phases.
Fusion-bonded epoxy (FBE) coatings have been in use since 1960 and, as such, are often mistakenly viewed as an established, unchanging technology. Instead, FBE formulations of today are substantially different from their predecessors of even a few years ago. The type of environmental conditions into which coated pipel…
The present communication describes a new, organometallic synthesis method for CdTe nanocrystals using cadmium stearate as cadmium source; nanocrystals of different morphologies like spheres, rods and spikes were prepared and the metastable crystallographic hexagonal phase was stabilised in all samples.
Coexisting SO2 considerably enhanced the catalytic activity of Ir/SiO2 for NO reduction with CO in the presence of O2 because of the formation of a cis-type coordinated species of NO and CO to one iridium atom ([formula: see text]), a possible reaction intermediate leading to N2 formation.
Mesoporous hybrid materials containing bridged metal–cyclam moieties in the silicate framework were synthesized by using triblock copolymer F127 as template and SiH3 as hydrolysable terminal groups; grafting of a metal–cyclam precursor in the channel pores led to materials containing two different strongly chelated tr…
Surface-wave propagation in a metamaterial grounded slab is investigated. In particular, a double-negative (DNG) medium is considered. On the basis of the dispersion equations for TE and TM surface waves supported by such a grounded slab, conditions are presented which ensure the suppression of a guided-wave regime fo…
Since the factors that influence microstructure formation are extensive (e.g., alloy composition, applied stress, external magnetic field, etc.), quite a lot of experimental trial-and-error is often necessary when searching for the best combination of desired microstructure and material properties, even when the basic…
The synthesis of “side chain” functionalized MCM-41 inorganic−organic hybrids, through the exchange method of the template with the cationic organosiloxanes (CH 3 O) 3 SiCH 2 CH 2 CH 2 NH 3 + Cl -, (CH 3 O) 3 SiCH 2 CH 2 CH 2 NHCH 2 CH 2 NH 3 + Cl -, and (CH 3 CH 2 O) 3 SiCH 2 CH 2 CH 2 N(CH 3 ) 3 + Cl - is reported.…
The ligand 1-(2-methoxyethyl)tetrazole (teeOMe) reacts with copper(II) bromide to form two different isomers with the formula [Cu(teeOMe)2Br2]n. The coordination details on the crystal packing are determined by the solvent from which the compound crystallises. In methanol, green crystals of α-[Cu(teeOMe)2Br2] (1) are…
An ethanolic extract of Parsley, Petroselinum crispum (Mill.) Nym.ex A.W. Hill (Umbelliferae), was tested for its ability to inhibit gastric secretion and to protect gastric mucosa against the injuries caused by pyloric ligation, hypothermic restraint stress, indomethacin and cytodestructive agents (80% ethanol, 0.2 M…
The adsorption, dissociation and reaction of NO with CO have been investigated on supported Au catalysts. The main method was FTIR spectroscopy. Although very limited dissociation of NO was observed on reduced Au catalyst, catalytic tests showed that all the samples used effectively catalyse the NO + CO reaction above…
ment time, nature and flow rate of the gas, and plasma power have been varied. In order to establish the chemical effect of plasma treatment on cotton fibres the following tests have been performed: Cuprammonium fluidity test, weight loss measurement, determination of carboxyl groups, carbonyl group identification, FT…
In this communication we demonstrate high temperature proton conduction in the phase La(1-x)Ba(1+x)GaO(4-x/2), with conductivities significantly higher than reported for other phases containing tetrahedral ions, such as doped LaPO4.
We have researched and developed a new Heusler-type ferromagnetic shape memory alloy Co2NiGa, which has large magnetostriction caused by the magnetic-field-induced re-arrangement of martensite twin. The ribbon samples produced by rapid-solidification melt-spinning method show strong texture and large magnetostriction…
Oxide films formed on Type 316L (UNS S31603) stainless steel (SS), Alloy 600 (UNS N06600), and Alloy 690 (UNS N06900) in high-temperature aqueous environments of pH 5, 8, and 10, which represent possible situations created in the secondary circuit of pressurized water nuclear reactors, were examined by scanning electr…
Abstract The viscosity of uncompatibilized polymer blends often shows a negative deviation from a log‐additivity rule at shear rates relevant to processing. This deviation has been attributed to interfacial slip, which is related to the loss of entanglements at the interface. In this work interfacial slip and the effe…
The materials processing, consisted of a four step process of solution treatment, pre-strain, overaging and hot working, was developed for attaining structural stability at high temperatures in a commercial Mg–Zn–Zr alloy, ZK60. The grain size of the material processed by this schedule was refined to 2.5 μm, and the m…
A perovskite Bi(Ni 1/2 Ti 1/2 )O 3 was successfully synthesized under high pressure 6 GPa. This compound has orthorhombic cell with the parameters, a = 2 a m sin( g /2) = 0.5626(2) nm, b = 4 b m = 1.5681(6) nm, and c = 2 c m cos( g /2) = 0.5548(2) nm containing eight monoclinic primitive perovskite unit with the param…
The reaction between C3H8 and N2O over steam-activated FeMFI zeolites leads to high yields towards propene (24%) and propionaldehyde (6%) at 773-798 K.