Materials Literature
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We report a detailed numerical investigation of a recently introduced two-dimensional model for square-to-rectangle martensitic transformation that explains several unusual features of the martensitic transformation. This model includes inertial effects, dissipation, long-range interaction between the transformed doma…
Triplet state mediated di-pi-methane rearrangements of dibenzobarrelenes give a variety of interesting synthons, formed as primary and secondary photoproducts. These synthons could find use for the synthesis of complex synthetic targets. This tutorial review highlights the photoisomerisation of some bridgehead substit…
Heterojunctions of Nb-doped ${\mathrm{S}\mathrm{r}\mathrm{T}\mathrm{i}\mathrm{O}}_{3}$ substrate and ${\mathrm{Y}\mathrm{B}\mathrm{a}}_{2}{\mathrm{C}\mathrm{u}}_{3}{\mathrm{O}}_{y}$ thin films show photoconductivity and photovoltaic effects due to photocarrier injection. Photocarrier injection is expected to be a new…
Selection d'interventions presentees a la conference EUROMAT 2003 lors de la session S1 Solidification et de la session S3 Solid state transformation.
Abstract By using novel oxidants, namely, sodium salt of para ‐toluene sulfonic acid, lithium perchlorate, and potassium ferricyanide, and varying the oxidant to monomer ratio from as low as 1/100 to 1/20 in the presence of concentrated HCl, it has been possible to simultaneously polymerize aniline and crystallize the…
Abstract The current-voltage relations for a p -type or n -type semiconductor with inert metal electrode, in which the acceptors or donors are mobile, are evaluated. The relations found are, as expected, different from those in a doped semiconductor in which the acceptors or donors are immobile. This is not an academi…
Abstract The electrical‐resistivity/temperature behaviors of low‐density polyethylene (LDPE)/carbon black (CB) composites irradiated with 60 Co γ rays were studied. The experimental results showed that the irradiated composites could be separated into insoluble crosslinking networks with CB (gel) and soluble component…
Resistance ( R )–current ( I ) curves in trilayer CPP-GMR (current perpendicular to plane-giant magnetoresistance) elements show a parabolic baseline because of Joule heating, and abrupt jumps due to magnetization reversals. The bottom of the parabolic baseline shifts in one current direction for reasons that were pre…
A combined structural refinement of Bi3.5La0.5Ti3O12 against both neutron and X-ray diffraction data was performed at 298 K on the basis of the Raman study. The upshift of Raman peaks suggested that the substitution sites of La atoms in Bi3.5La0.5Ti3O12 were only the Bi sites in the perovskite units. Of the two crysta…
Abstract The sensitizing effects of polyfunctional poly(ester acrylate) on the radiation crosslinking of polycaprolactone (PCL) were studied. The influences of the use of the polyfunctional material, the number of functional groups, and the radiation dose on the radiation crosslinking, dynamic mechanical properties, a…
Abstract X‐ray diffraction methods, DSC thermal analysis, and polarized light microscopy (PLM) were used to investigate the structural changes of nylon 66/clay nanocomposites. PA 66/clay nanocomposites were prepared by the method of melt intercalation. The results indicate that the addition of the intercalated organo‐…
Electrical measurements are done on Se85−xTe15Inx (x = 0, 2, 4, 6 and 10 at%) thin films. The dark conductivity (σd) increases and the activation energy (ΔEd) decreases as the In concentration increases. The photoconductivity (σph) also increases with the increase in In concentration. The photosensitivity (σph/σd) dec…
Electron exchange between [Co(terpy)2]3+ and [Co(terpy)2]2+ can be monitored by 1H NMR exchange spectroscopy and allows the cobalt(II) spectra to be fully assigned.
Transparent conductive films of 2 at% Ga-doped ZnO films were prepared on C-plane sapphire substrates by e-beam evaporation in vacuum. The optical absorption, reflectance, structural and electrical properties of 2 at% Ga-doped ZnO films were investigated. The films are highly transparent (>80%) in visible–NIR ranges,…
Abstract We consider many of the fundamental dynamic properties of ionically conducting glasses, crystals and melts and show there are analogues in the dynamic properties of glass-forming substances. These similarities suggest the dynamics of these two classes of complex systems are governed by the same physics. We al…
Abstract Polyethylene (PE)–vermiculite (VMT) nanocomposites containing 0.5, 2, 4, 6, and 8 wt % clay loadings were fabricated via direct melt compounding in a twin‐screw extruder. Crystallization kinetics was investigated by means of polarized optical microscopy and differential scanning calorimetry. Moreover, the kin…
Abstract The toughening behavior of polycarbonate modified with core‐shell type particles was investigated. The alloys were found to exhibit maximum impact strength upon addition of a modifier with a poly(butyl acrylate) rubbery core of 0.25 μm diameter. The incorporation of particles with diameter greater than 0.25 μ…
The photophysical properties of L-lysine-based polypeptides bearing porphyrin pendants were investigated. The intramolecular exciton-exciton annihilation resulting from the exciton migration among the porphyrin units deactivates the singlet excited state efficiently. It was revealed that the rate of the exciton migrat…
Zinc stannate (Zn 2 SnO 4 ) thin films were deposited by RF magnetron sputtering on silica substrates at various [O 2 /(Ar+O 2 )] flow ratios. The influences of the [O 2 /(Ar+O 2 )] flow ratio on the crystalline structure, and the optical and electrical properties have been investigated. No sharp X-ray diffraction (XR…
Abstract Differential scanning calorimetry (DSC) does not allow for easy determination of the glass‐transition temperature ( T g ) of the polystyrene (PS) block in styrene–butadiene–styrene (SBS) block copolymers. Modulated DSC (MDSC), which deconvolutes the standard DSC signal into reversing and nonreversing signals,…