Materials Literature
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Macroscopically long ropes of aligned single-walled carbon nanotubes (SWNTs), synthesized by a hydrogen and argon arc discharge method, were cold pressed into tablets without any binder for measurements of their volumetric hydrogen storage capacity. The typical apparent density of the tablets was measured to be around…
The volume of glassy a -SiO 2 upon compression to 9 GPa was measured in situ at high temperatures up to 730 K and at both pressure buildup and release. It was established that the residual densification of a -SiO 2 glass after high-pressure treatment was due to the irreversible transformation accompanied by a small ch…
The inhibition of the copper corrosion in aerated 3 per cent sodium chloride solution was studied by using electrochemical polarisation, weight loss and impedance measurements in the presence of different concentration of synthesised bipyrazolic compounds: N,N‐bis (3,5‐dimethylpyrazol‐1‐ylmethyl) butylamine (bipy1); N…
For the first time, self-diffusion was systematically investigated in well-compacted nanocrystalline (grain size d approximate to 80-100 nm) gamma-Fe-40 wt.% Ni material in a wide temperature range (600-1010 K) in all Harrison-type kinetic regimes. Samples were prepared by sintering the nanocrystalline Fe-Ni powder mi…
Conformational changes of periplasmic binding proteins are essential for their function in chemotaxis and transport. The allose-binding protein from Escherichia coli is, like other receptors in its family, composed of two alpha/beta domains joined by a three-stranded hinge. In the previously determined structure of th…
The 3d electronic structure and phase transition in pure and Cr doped V2O3 are theoretically investigated in relation to the 3d spin-orbit interaction and lattice distortion. A model consisting of the nearest-neighbor V ion pair with full degeneracy of the 3d orbitals is studied within the many-body point of view. It…
Using AlN and RE 2 O 3 (RE = Y, Yb) as sintering additives, two different SiC ceramics with high strength at 1500°C were fabricated by hot‐pressing and subsequent annealing under pressure. The ceramics had a self‐reinforced microstructure consisting of elongated α‐SiC grains and a grain‐boundary glassy phase. High‐tem…
Monte Carlo simulations of the spatially homogeneous Boltzmann equation for inelastic Maxwell molecules, performed by Baldassarri et al. (cond-mat/0111066), have shown that general classes of initial distributions evolve for large times into a singular nonlinear scaling solution with a power law tail. By applying an a…
The crystal structure of Rb-III, stable between 13 and 17 GPa, has been determined from quasi-single-crystal x-ray diffraction data. It is orthorhombic, space group C222(1), with 52 atoms in the unit cell, and has an 8-10-8-8-10-8 stacking of 8- and 10-atom layers. The recently reported 84-atom structure of Cs-III can…
We study the effect of multiparticle interactions on optical gain and stimulated emission in close-packed solids of chemically synthesized CdSe nanocrystals (nanocrystal quantum dots). An analysis of pump-dependent nonlinear absorption signals indicates that the band-edge optical gain is due to multiparticle states wi…
Cover-plate materials are influencing the build-up distances and delay times of high explosive charges in contact to the barrier, loaded by shaped charge jets. Materials with strong bulging behavior give long build-up distances, as steel and ceramics, with subsonic perforation velocities in contrast to materials with…
Large linear electrooptics (the Pockels effect) of up to 17 pm/V for the wavelength 435 nm has been observed in ZnO films doped by fluorine and deposited on bare glass. In order to describe the phenomenon observed, a complex approach, including self-consistent band structure calculations together with the appropriate…
Article Electrochemical Methods for Corrosion Rate Determination Under Cathodic Polarisation Conditions - A Review Part II - AC Methods was published on April 1, 2002 in the journal Corrosion Reviews (volume 20, issue 3).
X-ray diffraction experiments have been carried out on b-eucryptite (LiAlSiO 4 ) at pressures up to 2.5 GPa and temperatures up to 1073 K in a large-volume apparatus. With room-temperature compression, we observed a phase transition to a new polymorph between 0.83 and 1.12 GPa. This transition is reversible in charact…
A brief overview is presented on the status of the synthesis of unsymmetric phthalocyanines and related compounds. The main aim of this paper is to describe the key problems and the interest in synthesizing new functionalized unsymmetric phthalocyanine systems. Some phthalocyanine homologues and analogues like subphth…
The development of theoretical models that describe the electronic structures of the porphyrins and phthalocyanines using ZINDO and DFT techniques is rapidly approaching the point where the major spectral bands over a wide energy range, for both symmetric and non–symmetric molecules can be fully accounted for. However…
Poly(vinyl alcohol)-graft-poly(ε-caprolactone) (PVA-g-PCL) was synthesized by ring-opening polymerization of ε-caprolactone with poly(vinyl alcohol) in the presence of tin(II) 2-ethylhexanoate as a catalyst in dimethyl sulfoxide. The relationship between the reaction conditions of the solution polymerization and the c…
A time-resolved infrared spectroscopic investigation was made into the thermal imidization behavior of poly(3,4′-oxydiphenylene pyromellitamic acid) precursor in a microscaled film. The CNH bend–stretch (amide-II band) was found to be the most useful tool for examining the imidization mechanism in the precursor film.…
A spent clay from the oil refining industry was recycled through an extraction process using organic solvents for removal of residual oil, followed by reactivation through heat treatment. The solvents used showed the following order in the efficiency of oil extraction: methylethylketone > acetone > petroleum ether ≅ h…
An ethylene-air laminar diffusion flame successfully provided silicon substrates of anodic aluminum oxide (AAO) template with vertically oriented well-aligned carbon nanotubes. Field emission scanning electron microscopy (SEM) showed that open-tipped carbon nanotubes consisting of tube elements with the same length an…