Materials Literature
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Abstract A one-shot-laser-pulse (6 ns) irradiation converted the electronic state of Na0.68Co1.20[Fe(CN)6]·3.7H2O from FeII(S=0)-CN-CoIII(S=0) to FeIII(S=1/2)-CN-CoII(S=3/2) at room temperature. This photochemical reaction was observed only above the power density of 45 mJ pulse-1 cm-2, and its quantum yield amounted…
Capsule integrity as a function of the acid concentration, the acid-adding sequence, the outermost layer of the deposited multilayers, and the capsule wall thickness was investigated using confocal laser scanning microscopy. Optimal conditions for fabricating good quality polyelectrolyte capsules templated on melamine…
In this work we have investigated the electrocatalytic activity for O2 reduction of monomeric (FePcTA) and polymeric (poly-FePcTA) iron tetraaaminophthalocyanine, deposited on glassy carbon. The activity of the electropolymerized ligand (poly-H2PcTA) was also investigated. Its activity is much lower than the activity…
Thin films of ZnxIn2Ox+3 (x=2, 3, 4, 5, 7, 9, 11, 13, and 15) were grown by pulsed laser deposition and their electronic properties characterized. Through resistivity, Hall mobility and carrier concentration measurements as a function of temperature, we found that whatever the composition, these films behave as n-type…
Dolomite powder from Coín (Spain) was heated in air at a constant rate of 2°C/min to 1000°C, while neutron diffraction patterns were collected every 150 s. Rietveld refinement was applied and raw intensity data were used to monitor decomposition. The full process happened in two stages: dolomite decomposition to give…
A new method for the kinetic analysis of the initial stage of sintering for constant‐heating‐rate data has been proposed. Unlike all of the methods previously reported in the literature, this new method proposed here allows the simultaneous determination of the activation energy and the kinetic model from a single dil…
The dielectric relaxation strength of the β process, Δεβ, in a rigid-molecular glass of 16.6 mol % chlorobenzene cis-decalin mixture increases slowly with temperature, T, until the glass-softening range is reached, and thereafter it increases rapidly, i.e., (dΔεβ/dT) increases at Tg relatively abruptly. This is remark…
Polyamidoamine (PAMAM) dendrimers were prepared by linking methyl methacrylate and ethylenediamine successively on an amine core. Surface modification of PAMAM dendrimer was done by fatty acid grafting converting them to a unimolecular micellar system (Dendrimer grafts). IR, 1H NMR, 13C NMR studies confirmed the struc…
A model is presented that allows prediction of the properties of a fiber assembly under compression from the physical properties of its component fibers, taking into account both static and kinetic friction. Unlike previous models, this model is not based on the assumed behavior of idealized bending elements. Computer…
Simple and complex carbohydrates have been described as "the last frontier of molecular and cell biology". The enzymes that are required for the synthesis and degradation of these compounds provide an enormous challenge in the post-genomic era. This reflects both the extreme chemical and functional diversity of sugars…
It’s well known that x-ray line profile analysis is a powerful and convenient method to probe the microstructural characteristics of nanocrystalline samples. In the literature well-documented techniques are normally used to obtain crystalline size distributions from x-ray line-broadening analysis. However, it is less…
In this article, we report the dielectric and piezoelectric properties of Mn modified 0.92Pb(Zn1/3Nb2/3)O3–0.08PbTiO3 (PZNT) single crystals. The crystals were grown by the modified-flux method. Mn substitution resulted in enhanced mechanical quality factor, Qm, and a moderate increment in the rhombohedral to tetragon…
We provide a systematic study on the linear and nonlinear optical properties of silicon nanocrystals (Si-nc) grown by plasma-enhanced chemical vapour deposition (PECVD). Linear optical properties, namely absorption, emission and refractive indices are reported. The sign and magnitude of both real and imaginary parts o…
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…