Materials Literature
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Water-soluble Prussian-blue (PB) analogue transition metal hexacyanoferrate (HCF) nanoparticles FeHCF, CoHCF, NiHCF and CuHCF have been synthesized by using poly(N-vinyl-2-pyrrolidone) as a protective matrix. Transmission electron microscopy (TEM) images of the synthesized PB analogues showed stable and well dispersed…
Ferromagnetism at room temperature, along with a spin-glass-like behaviour at low temperatures, has been observed in laser ablated V-doped ZnO thin films. It is found that V atoms were well substituted for Zn atoms and resulted in a very uniform distribution among the ZnO matrices.
Magnetic properties have been investigated for a zinc ferrite thin film deposited on glass at a substrate temperature close to room temperature using a sputtering method. X-ray diffraction analysis reveals that the thin film consists of nanocrystalline ZnFe(2)O(4) with the size of approximately 10 nm. The magnetizatio…
Non-reversing relaxation enthalpies (ΔH(nr)) at glass transitions T(g)(x) in the P(x)Ge(x)Se(1-2x) ternary display wide, sharp and deep global minima ([Formula: see text]) in the 0.09<x<0.145 range, within which T(g) s become thermally reversing. In this reversibility window, glasses are found not to age, in contrast…
The measurement of optical extinction is used to determine the size of nearly spherical gold nanoparticles suspended in solution, produced by a ‘reverse micelles’ process. The contrast between the maximum and the minimum in the extinction spectra around 450 and 520 nm shows a linear dependence with the mean radius of…
The optical properties of ZnO quantum wells, which have potential application of short-wavelength semiconductor laser utilizing a high-density excitonic effect, were investigated. Stimulated emission of excitons was observed at temperatures well above room temperature due to the adoption of the lattice-matched substra…
Twisting of polymer lamellae manifested by e.g. appearance of concentric bands in polymer spherulites examined in a polarized optical microscope remains a topic of research and controversy. It has been interpreted variously as resulting from phenomena that take place during growth or from structural features of indivi…
Abstract The coordination complexes of the crystalline structure of cellulose ethers/Eu(III) with fluorescence emission, viz CMC/Eu(III), MC/Eu(III), and HEC/Eu(III), were synthesized and characterized. Results showed the emission spectra of Eu 3+ ions in these coordination compounds, which originates from electric di…
Abstract Interpenetrating polymer networks (IPNs) of polyurethane (PU)/polyacrylates have been synthesized by sequential polymerization of castor oil, methylene diisocyanate (MDI), and acrylate monomers such as methyl acrylate (MA), methyl methacrylate (MMA), and ethyl acrylate (EA); with benzoyl peroxide (BPO) and et…
Abstract An optothermomechanical (OTM) device was designed and constructed for fiber characterization with a double‐beam interference microscope. This device enabled us to correlate both the mechanical properties and the thermal properties with the optical properties of fibers. The OTM device consisted of three parts,…
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…