Materials Literature
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The optical band gap of ZnO thin films deposited on fused quartz by metal-organic chemical-vapor deposition was studied. The optical band gap of as-grown ZnO blueshifted from 3.13to4.06eV as the growth temperature decreased from 500to200°C. After annealing, the optical band gap shifted back to the single-crystal value…
The frequency characteristics of a lighting element using carbon nanotube-based composite as cold-cathode material were studied. A delay response characteristic and a cutoff frequency have been observed. Furthermore, the dependence of cutoff frequency on the structural parameters of the electron gun of the lighting el…
Doping of La(2)O(3) crystallites with Ca(2+) ions significantly enhances the intrinsic rate of NO reduction by CH(4) in the presence of 5% O(2) at 550 degrees C compared to pure La(2)O(3) and CaO solids, while the opposite is true after doping of CaO with La(3+) ions. It was found that the 5 wt % La(2)O(3)-95 wt % CaO…
The pressure's off: The coupling of propylene (1) to generate benzene (2) at 70 °C and atmospheric pressure was observed together with propylene hydrogenation and oxygenation on titania-supported Pd nanoclusters (in green). The catalysts consist predominately of metallic Pd0. The selectivity of benzene formation is de…
The linear and nonlinear optical properties of trans-cisoïd saturated and unsaturated polyaminoborane/polyphosphinoborane alternating copolymers are studied at the MP2/6-311G(2d)//PBE0/6-31G(2d) level of approximation, by using the increasingly large oligomer series methodology. We report the evolution with chain leng…
We report on a comparison between stress relaxations after an applied step strain and stress relaxations during slow, continuous strain in a bubble raft. A bubble raft serves as a model two-dimensional foam and consists of a single layer of bubbles on a water surface. For both step strains and continuous strain, one o…
The chemical reactivity of 3-methyl-2-methylthio-1,3,4-thiadiazolium salts towards a variety of nucleophiles has been examined from several theoretical points of view including thermochemical analysis of the global reactions, the evaluation of aromaticity-related parameters -ASE (Aromatic Stabilization Energy), NICS (…
In frameworks of a nesting model for Q1D organic conductors at the antiferromagnetic (SDW) quantum critical point, the first-order transition separates the metallic state from the soliton phase having periodic domain structure. The low-temperature phase diagram also displays a 2nd-order transition line between the sol…
Abstract The melt spinning and melt drawing of poly( L ‐lactic acid) (PLLA) were carried out with a melt‐spinning machine, and the mechanical properties, structure, and biodegradability of PLLA fiber were investigated. PLLA fiber with a tensile strength of 0.81 GPa was successfully obtained through two steps of drawin…
Great progress has been made in basic features of the potential energy landscape (PEL) theoretically. The present work, however, attempts to cast new light on it from experimental aspects. By a survey of experimental data related to thermodynamics or dynamics of metallic glass-forming liquids, it is found that the inc…
Using wide-angle X-ray diffraction, high-resolution solid-state 13 C NMR (SNMR), attenuated total reflection infrared (ATR/IR), and Fourier transform infrared (FTIR) spectrometry, we investigated the crystalline structure and morphology of melt-crystallized poly(3-hydroxypropionate)s (PHPs). The melt-crystallization o…
The stress state of MgO thin films, which are used as the dielectric protective layer in alternating current plasma display panels (ac-PDP), was measured by a laser scanning method, in which the bending curvature of a substrate was detected. MgO films were deposited by e-beam evaporation on glass substrates with a die…
Abstract This paper is devoted to the formation of a spherulitic pattern in polymers that are spatially confined. The nucleation at sample boundaries influences the spherulitic structure and accelerates the local conversion of melt into spherulites. A model of the spherulitic pattern formation in narrow strips of poly…
We rigorously derive the formulas of the total electric and magnetic fields in a slab of anisotropic negative refractive medium by use of Maxwell's equations. A beam shifting is exhibited from a Gaussian beam for an anisotropic negative refractive slab. Our results indicate that there exist two possible (positive or n…
The sensitivity verification with the ultrahigh-frequency (UHF) method will be discussed in this paper. The sensitivity line with the UHF method based on the conventional (IEC 60270) one is different in the radial position of the defects inside gas-insulated substation (GIS), because transverse-electromagentic mode ca…
The objective of this work was to develop a SPICE compatible equivalent circuit of a thermoelectric module (TEM). A methodology is developed for extracting the parameters of the proposed model from manufacturers' data of thermoelectric coolers (TEC) and thermoelectric generators (TEG). The model could be helpful for a…
Abstract Cationic fluorinated polyurethane‐acrylate hybrid dispersions were prepared by the copolymerization of styrene, butyl acrylate, and 2, 2, 3, 4, 4, 4‐hexafluorobutyl methacrylate in the medium of crosslinked polyurethane via phase inversion polymerization. The said polyurethane was synthesized in acetone from…
Abstract Poly(methyl methacrylate) (PMMA)–clay nanocomposite (PCN) materials were synthesized through in situ intercalative polymerization. A cationic surfactant, [2(dimethylamino)ethyl]triphenylphosphonium bromide, was used as an intercalating agent with pristine Na + ‐montmorillonite (MMT). The synthesized PCN mater…
Abstract Poly(3‐hydroxy undec‐10‐enoate) (PHU) was synthesized by feeding Pseudomonas oleovarans with 10‐undecenoic acid and nearly 100% hydroxylation of double bonds of PHU was achieved by hydroboration–oxidation reaction using 9‐borobicyclononane. The disappearance of vinyl signals of PHU in proton and 13 C NMR spec…
Density functional theory at the B3LYP/6-311++G(d,p) level is applied to calculate the (29)Si NMR chemical shifts of a variety of organosiloxane moieties including monomers or precursors for polymerization and representative segments of organosiloxane polymers or thin films. The calculated shifts of two linear dimethy…