Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTEfficient Synthesis of 2,11,20-Triaza[3.3.3](2,6)pyridinophaneGeunsu Lee, Masakazu Oka, Hiroyuki Takemura, Yuji Miyahara, Nobujiro Shimizu, and Takahiko InazuView Author Information Department of Chemistry, Faculty of Science, Kyushu University, Hakozaki, Higashi-ku, Fukuoka 81…
High molecular weight copolyesters were prepared by the acidolysis of poly(ethylene terephthalate) with p-acetoxybenzoic acid and polycondensation through the acetate and carboxyl groups. The mechanical properties of the injection-molded copolyesters containing 40–90 mole- % p-hydroxybenzoic acid (PHB) were highly ani…
We have investigated the operating parameters controlling the average roughness Ra of diamond films obtained through chemical-vapor deposition using microwave-sustained plasmas. The plasma was provided by a surface-wave discharge in the form of a convex hemisphere facing the substrate and the films were deposited on S…
In this work the anharmonic contributions to the high-temperature EXAFS spectra have been evaluated by considering the anharmonic contributions to the thermal vibrations of atoms and using the single-shell model. The anharmonicity calculated by our new formula is proportional to the temperature and inversely proportio…
The electronic structure of heazlewoodite ${\mathrm{Ni}}_{3}$${\mathrm{S}}_{2}$ has been studied within the local-density approximation, using an extended general-potential linearized augmented-plane-wave method. The calculation indicates that unlike many other transition-metal sulfides and oxides, ${\mathrm{Ni}}_{3}$…
An experimental study has been made on the interaction of an underwater shock wave with two air bubbles attached to a gelatin surface. The shock wave was generated by detonating a microexplosive pellet, and the subsequent behavior of bubble collapse was visualized by high-speed photography. By measuring the directivit…
A multiordering parameter model for glass-transition phenomena has been developed on the basis of nonequilibrium thermodynamics. In this treatment the state of the glass is determined by the values of N ordering parameters in addition to T and P; the departure from equilibrium is partitioned among the various ordering…
By using angle-resolved ultraviolet photoelectron spectroscopy, x-ray photoelectron spectroscopy, and work function measurement, we have explored the electronic states of the heteroepitaxial double-layer (HEDL) system composed of Ni(111), monolayer hexagonal boron nitride, and graphite overlayer. Present data clearly…
A survey of potential shallow n-type donors in diamond was performed using the atom superposition and electron delocalization molecular-orbital method. Electronic structure and defect stabilities were estimated for N, P, O, S, F, and Cl in substitutional monovacancy sites; I, Xe, and the atom pairs BO, BS, NO, NS, and…
Due to the inherent simplicity of the graphene tubule systems, it is expected that these systems will become model systems for the calculation of the mechanical and electronic properties of idealized carbon fibers. In this paper the collective electronic excitations on graphene tubules are discussed. The frequencies o…
The synthesis of the first derivatives of bis(pyrrolo[3,4-d])tetrathiafulvalene has been studied in detail. Starting from the readily available 2,5-dimethylpyrrole (11) and N-phenyl-2,5-dimethylpyrrole, bis(2,5-dimethylpyrrolo[3,4-d])tetrathiafulvalene (8) and the N,N'-disubstituted derivatives 6, 7, 9, and 10 were pr…
Theoretical exploration of a group of ``${\mathrm{C}}_{60}$-like'' ${\mathrm{B}}_{12}$-based materials, ${\mathit{A}}_{\mathit{x}}$${\mathrm{B}}_{12}$, with A=(Li and Ca) and x=1--4, is made by performing local-density approximation Gaussian basis calculations of the total energy, heats of formation, lattice constant,…
Various polygonal defects which retain the three-bonded character of carbon are proposed as disclinations in graphitic carbon. The n-gonal defects, where n is an integer less than 5, are responsible for forming cones and are less stable than pentagonal defects in a hexagonal network which are responsible for forming s…
The oxygen adsorption on the Zr(0001) surface is studied using first-principles total-energy and force calculations. We calculated the atomic structure, heat of adsorption, work function, and electronic structure for oxygen occupying various surface and subsurface sites for both the Zr(0001)-(1\ifmmode\times\else\text…
Electrical and optical properties of electroluminescent porous silicon pn diodes have been investigated. The measurements were performed under pulsed conditions to maintain high quantum efficiency (∼0.2%) operation. Diodes with different peak wavelengths, obtained by varying the etching parameters, were used. A high c…
Glass transition in the system poly(methyl methacrylate)/compressed gas was studied as a function of the gas pressure p using a high-pressure Tian-Calvet heat flow calorimeter. Measurements were made on PMMA-CH4-C2H4, and ;-CO2 at pressures to 200 atm. All three gases plasticize the polymer leading to depression of th…
The properties of 100-nm-thick reactively sputter-deposited TiN films with different deposition conditions and one chemical-vapor-deposited film have been studied as diffusion barriers between Cu and Si by using sheet resistance measurements, x-ray diffractometry, etch-pit test, and Auger electron spectroscopy (AES).…
Amorphous hydrogenated carbon films have been deposited on crystalline silicon and on glass from an expanding thermal plasma. Two deposition parameters have been varied: the electric current through the plasma source and the admixed acetylene flow. No energetic ion bombardment has been applied during deposition. Ex si…
Quantitative x-ray-diffraction measurements were performed on a nanocrystalline Cu sample made by severe plastic deformation. The shape of Bragg reflections was found to be represented primarily by a Lorentzian function. A difference of as much as 6%±3% was revealed between the integrated intensities from the nanocrys…
The high- and low-pressure phases of crystalline boron oxide ${\mathrm{B}}_{2}$${\mathrm{O}}_{3}$ are investigated by first-principle calculations using a local-density approximation (LDA). Both phases are insulators with wide LDA band gaps of 6.20 eV for ${\mathrm{B}}_{2}$${\mathrm{O}}_{3}$-I (low pressure) and 8.85-…