Materials Literature
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Natural Na-montmorillonite (MMT) with the formula (Na0.67K0.01Ca0.02)(Al2.90Mg0.59 Fe3+ 0.49Ti0.01)(Si7.92Al0.08)O20(OH)4was intercalated with octadecylamine (C18H39N) (ODA) with varied MMT/ODA ratios. The basal spacings d(00l) of natural and intercalated Na-MMT with ODA were determined by XRD analysis. The set of bas…
The isothermal oxidation behaviour of two phase (α + β) titanium base alloy Ti6Al4V (coupons) has been studied at 1050, 1150, 1250, and 1340 K in O2 gas at atmospheric pressure for 2, 4, 6, 8, and 12 h. Investigations on kinetic behaviour followed by the metallographic examination of oxidised scale morphology was carr…
p-Type cupric oxide has been deposited electrochemically on platinum and gold electrodes from Cu(II) solutions containing various amino acids, which is very attractive because the procedure is simple and the preparation of large-area film is possible. This indicates that the anodic deposition of CuO takes place simult…
Multiwall nanotubes were functionalized using plasma treatments, chemical oxidation, ball milling and thermal treatments. In optimized conditions, plasmas modify nanotubes surface chemistry with a great selectivity. Vickers microindentation and tension tests performed on epoxy resin loaded with multiwall nanotubes all…
We report a quantum mechanical study on the complexes of lanthanide cations M3+ with bifunctional ligands L (denoted AcA, AccA, AcP, AccP, PcP and PccP) bearing amide “A” and/or phosphoryl “P” groups separated by one “c” or two “cc” CH2 connectors. The main aims are to (i) assess how strong is the chelate effect (i.e.…
A complete set of elastic, dielectric and piezoelectric coefficients for the domain engineered 0.70Pb(Mg1/3Nb2/3)O3‐0.30PbTiO3 [PMN‐30%PT] single crystal was measured by a hybrid method combining ultrasonic and resonance techniques. At room temperature, the PMN‐30%PT single crystal has rhombohedral symmetry. After bei…
We study numerically and analytically a simple off-lattice model of scalar harmonic vibrations by means of Euclidean random matrix theory. Since the spectrum of this model shares the most puzzling spectral features with the high-frequency domain of glasses (non-Rayleigh broadening of the Brillouin peak, boson peak and…
Polycrystalline samples of La4LiMnO8 and La3SrLiMnO8 have been studied by a combination of X-ray diffraction (XRD), neutron diffraction (ND), 6Li MAS NMR, electron microscopy (EM), and magnetometry. Room-temperature XRD and ND measurements suggest that both compounds have the K2NiF4 structure, with a disordered arrang…
Anomalous x-ray scattering experiments on glassy Ge
The titanium oxo-organo clusters [Ti16O16(OEt)32] are used as precondensed building blocks for the sol-gel synthesis of titanium oxide nanostructures in the presence of an amphiphilic block copolymer PS-b-PMAA (PS = polystyrene block; PMAA = polymethacrylic acid block) as a structure directing agent. It is shown that…
Simple reactions between Re(CO)5Cl and 2-benzoxazol-2-ylphenol, 2-benzothiazol-2-ylphenol or 2-(1-methyl-1H- benzoimidazol-2-yl)phenol (performed in boiling toluene) lead to dimeric complexes of general formula Re2(CO)6(N∩O−)2. The obtained dimeric species are quite stable in non-coordinating solvents, but in coordina…
The atom positions in the structure of the R-phase in a TiNi(Fe) intermetallic compound have been refined using the multi-slice least-squares method based on electron diffraction data obtained from 50 nm sized regions in a CM30 FEG TEM instrument. The refinement accounted for dynamic scattering including the specimen…
Two homologous series of phenylisoxazoles derived from 3-[4-(4-trans-n-heptylcyclohexyl]-5-(4-alkoxyphenyl)isoxazole and 3-[4-(4-trans-n-heptylcyclohexyl)phenyl]-5-(5-n-alkylthiophene)isoxazole have been synthesized. The liquid crystal compounds obtained were characterized by NMR, differential scanning calorimetry (DS…
Slow diffusion of aqueous solutions of europium(III) chloride into gel of sodium metasilicate containing malonic acid (H2mal) yields single crystals of the three-dimensional compound of formula [Eu2(mal)3(H2O)6] whose structure was determined by X-ray diffraction methods at 293 and 173 K. It crystallizes in the monocl…
The tryptophanyl emission decay of the mesophilic beta-galactosidase from Aspergillus oryzae free in buffer and entrapped in agarose gel is investigated as a function of temperature and compared to that of the hyperthermophilic enzyme from Sulfolobus solfataricus. Both enzymes are tetrameric proteins with a large numb…
The trifluoromethyl-substituted dithiadiazolyl and dithiazolyl radicals, F3CCNSSN (1) and F3CCSNSCCF3 (2) associate through pi*-pi* covalent and electrostatic S delta+...N delta- interactions in the solid state, but melt with a dramatic volume increase to generate paramagnetic liquids; these radicals exhibit thermal h…
The replacement of Phe120 with other hydrophobic residues causes a decrease in the activity and thermal stability in ribonuclease A (RNase A).To explain this, the crystal structures of wild-type RNase A and three mutants-F120A, F120G, and F120W-were analyzed up to a 1.4 Å resolution.Although the overall backbone struc…
A cDNA sequence from Schizosaccharomyces pombe with similarity to 6,7-dimethyl-8-ribityllumazine synthase was expressed in a recombinant Escherichia coli strain. The recombinant protein is a homopentamer of 17-kDa subunits with an apparent molecular mass of 87 kDa as determined by sedimentation equilibrium centrifugat…
Double layered vanadium oxide metal coordination complexes, [Ni(bipy)(H2O)V2O6]∞1 and {[Ni(bipy)2]2V6O17}∞2, have been isolated from the same hydrothermal reaction container. X-Ray crystallography shows that 1 consists of unique two-dimensional layers constructed from a vanadium oxide chain {V2O6}2n−n and covalently l…
This perspective reviews experiments in which spectroscopy rather than scattering is used to probe reactive potential energy surfaces. The application of negative ion photodetachment to the transition state spectroscopy of benchmark reactions is described, followed by a brief description of recent transition state spe…