Materials Literature
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Abstract The kinetics of domain size equilibration were studied for asymmetric poly(ethylene‐ alt ‐propylene)‐ b ‐poly(dimethyl siloxane) (EPDMS) and polyisoprene‐ b ‐poly(dimethyl siloxane) (IDMS) block copolymers in the body‐centered cubic ordered phase. Small‐angle X‐ray scattering measurements of the principal pea…
Abstract The dimensional stability of thermoplastics is characterized by their tensile compliance D ( t ,σ, T ) as a function of time t , stress σ, and temperature T . Creep retardation times are controlled by the free volume available for underlying molecular (segmental) motions. Tensile deformation of polymeric mate…
Abstract In this study, tetraethoxysilane (TEOS) and a metallocene polyethylene–octene elastomer (POE) were chosen as the ceramic precursor and the continuous phase, respectively, for the preparation of new hybrids by an in situ sol–gel process. To obtain a better hybrid, a maleic anhydride‐grafted polyethylene–octene…
Cooling of syndiotactic polystyrene (s-PS) solutions with bulky solvents, unsuitable as guests of s-PS clathrate phases, results in the formation of pastelike gels characterized by a trans-planar chain conformation and poor mechanical properties. Strong elastic gels with s(2/1)2 helical polymer chains forming a three-…
Abstract Polyamide 6/clay nanocomposites (PA6CN) were prepared via the melt compounding method by using a new kind of organophilic clay, which was obtained through cointercalation of epoxy resin and quaternary ammonium into Na‐montmorillonite. The dispersion effect of this kind of organophilic clay in the matrix was s…
Strong blue emission around 435 nm from porous silicon (PS) embedded in Pb(Zrx,Ti1−x)O3 (PZT) is realized, which is stable and clearly visible to the naked eye even after exposure in an ambient atmosphere for a year. The sample is obtained by hydrothermal etching of (100)-oriented single crystal silicon wafers in an H…
We describe the effect of nanoscale spatially coupled trapping centre (TC)–luminescent centre (LC) pairs on the thermoluminescence (TL) properties of LiF : Mg,Ti. It is shown that glow peak 5a (a low-temperature satellite of the major glow peak 5) arises from localized electron–hole (e–h) recombination in a TC–LC pair…
A high-temperature tensile stress study of a monolithic silicon nitride (Si3N4) was performed with time-of-flight neutron diffraction. A dedicated engineering diffractometer was employed at temperatures reaching 1375 °C. Rietveld refinements of diffraction spectra allowed the determination of (1) the coefficient of th…
The efficacy of nitrous oxide (N2O) inhalation on the elevated orofacial muscle tonus during dental treatment in patients with cerebral palsy (CP) was studied by measuring the mean frequency of electromyographic (EMG) discharge, blood pressure (BP) and heart rate (HR) taking mentally retarded patients (MR) as a contro…
Abstract This investigation deals with the recycling of polyurethane rubber by the application of high‐power ultrasound in a continuous ultrasonic coaxial reactor. The cured rubber has been devulcanized at various feed rates and various gap sizes and then revulcanized again with certain adjustments in the curing recip…
The formation of nanometre-scale silicon dots with a germanium core on an ultrathin SiO 2 layer has been studied by controlling the early stages of low-pressure chemical vapour deposition (LPCVD) alternately using pure monosilane and 5% germane diluted with helium. From atomic force microscope observations and x-ray p…
Abstract The physicochemical properties of mixed polymeric surfactant systems were studied with different techniques. A binary system consisting of lignosulfonate and petroleum sulfonate and a ternary system consisting of two different lignosulfonates and petroleum sulfonate were studied with respect to phase behavior…
Abstract Sisal fiber (SF) surface modification was carried out by grafting with methyl methacrylate (MMA) using cerium and ammonium nitrate as initiator. The effects of reaction time, monomer, and initiator concentration on the grafting parameters were systematically investigated. The results showed that MMA was succe…
Amorphous tin oxide films, 100–800 nm thick and of resistivity ∼6–8 mΩ cm, were deposited on glass substrates using a filtered vacuum arc with an oxygen background gas pressure of 4.0 mTorr. The films were annealed in air at a temperature of 300°C for 1, 3, 5, 7, and 10 min. Film morphology, structure, composition, ro…
The coexistence between a strained crystal and its shearing melt is studied using nonequilibrium molecular dynamics simulations of Lennard-Jones particles. The coexistence is found to be independent of initial conditions, boundary effects, and the details of the thermostat. The nonequilibrium phase diagram is presente…
Abstract The crystallization behaviors of polypropylene (PP) homopolymer and its blends with 0–15% functional polypropylene (FPP), the backbones of which were grafted with guanidine and diamide polymer chains, were investigated with differential scanning calorimetry and wide‐angle X‐ray scattering. The crystallization…
Crown-ether cyanide treatment, which simply involves immersion in KCN solutions containing 18-crown-6 followed by rinse, is studied in relation to electrical and optical properties of nitrogen-doped, polycrystalline Cu2O thin films, and its effect is compared with that of hydrogen treatment. By the crown-ether cyanide…
The syntheses and structural, spectral, and electrochemical characterization of the dioxo-bridged dinuclear Mn(III) complexes [LMn(mo-O)(2)MnL](ClO(4))(2), of the tripodal ligands tris(6-methyl-2-pyridylmethyl)amine (L(1)) and bis(6-methyl-2-pyridylmethyl)(2-(2-pyridyl)ethyl)amine (L(2)), and the Mn(II) complex of bis…
We develop a simple to implement, inherently parallel and high throughput technique for the fabrication of large areas of patterned aligned multi-wall carbon nanotube (CNT) arrays deposited on silicon or quartz substrate. This technique makes use of a parallel or converging laser beam from a high power pulsed laser fo…
The binding interactions between the pyridine and small coinage metal clusters such as copper, silver and gold in different sizes (n=2–4) have been investigated by a density function theory approach. We obtain the binding energies of these pyridine–metal cluster complexes and analyze the nature of the binding interact…