Materials Literature
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Molecular design of a novel dendrimer porphyrin for supramolecular fullerene/dendrimer hybridization, Molecular design of a novel dendrimer porphyrin for supramolecular fullerene/dendrimer hybridization
A three-dimensional structure comparison between the dimeric regulatory serine-binding domain of Escherichia coli D-3-phosphoglycerate dehydrogenase [Schuller, D. J., Grant, G. A., and Banaszak, L. J. (1995) Nat. Struct. Biol. 2, 69-76] and the regulatory domain of E. coli threonine deaminase [Gallagher, D. T., Gillil…
The crystal structure and magnetoresistance of the polycrystalline La1−xLixMnO3 (x=0.10, 0.15, 0.20, 0.30) are investigated. The result of the Rietveld refinement of x-ray powder diffraction shows that the room temperature structural transition from rhombohedral (R3̄C) to orthorhombic (Pbnm) symmetry occurs at the Li-…
Field emission characteristics of various kinds of single-wall carbon nanotubes have been calculated using a combination of methods derived from quantum and electromagnetic theory. The energy distributions of the emitted electrons, obtained for all the nanotubes, confirm the implication of localized states in the emis…
Resonance Raman scattering from 1 and 2 LO phonons is investigated from Cd1−xZnxS nanoparticles dispersed in oxide glass before and after annealing. The resonance profiles are found to exhibit asymmetry which is attributed to the interference effects arising from a nonresonant contribution to the polarizability. The e…
Based on optical fundamentals, we present in this article a practical method to obtain an interference fringe-free transmission spectrum for hydrogenated amorphous solid thin films. From this spectrum, reliable optical properties, such as the Urbach edge and optical band gap of the thin films, can be extrapolated dire…
A detailed investigation of the correlation among intrinsic stress (σint), nonuniform stress (σnu), and phonon lifetime (1/Γ) was performed in order to obtain a coherent and comprehensive picture of the microstructure of diamond thin films grown by the electron cyclotron resonance-assisted chemical vapor deposition (E…
Optical properties of the deposited germanium–oxide (Ge–O) prepared from the laser ablation of GeO2 were investigated. When the GenOm clusters, having the compositions mainly at n=m, were deposited onto a substrate as a precursor, strong visible photoluminescence peaked at 500 nm was observed under the excitation of 3…
Physical properties such as dielectric, specific heat, thermal expansion, and mechanical hardness have been measured for sodium p-nitrophenolate dihydrate single crystals. The dielectric measurements were made both as a function of frequency (in the range 15 kHz–10 MHz) and temperature (in the range 30–80 °C). For the…
Two types of current crowding structures were simulated in this work. In each structure, both the pattern of current crowding and the magnitude of the associated current density gradient were examined. Factors like line width, curvature, and conductivity, which affect the crowding behavior, were analyzed. The numerica…
We have measured the collective electronic excitations of the Al(111) surface by means of angle-resolved high-resolution electron-energy-loss spectroscopy. Loss spectra reveal both the monopole and the multipole surface plasmons. The measured dispersion of the monopole surface plasmon is negative, as predicted by calc…
We used x-ray magnetic circular dichroism (XMCD) to obtain element specific magnetization curves. The most common way measuring XMCD in the soft x-ray region is total electron yield (TEY), because of the easy experimental setup and high signal-to-noise ratio compared to fluorescence yield. Surprisingly TEY was used on…
The bcc $\ensuremath{\rightarrow}\ensuremath{\Omega}$ phase transition is diffusionless: two-thirds of the atoms in the $(111)$ planes of the bcc phase collapse into double layers, whereas the third remains a single layer. This transformation is observed in the group-IV elements Ti, Zr, and Hf at high pressure, but it…
Tight-binding calculations are presented for the formation energies of a type of topological defect called the 5-77-5 defect in achiral carbon nanotubes. The calculations show that the defect formation energy is dependent on the chirality and radius of a tube as well as the different orientations of a 5-77-5 defect in…
We report three surprising results regarding the nature of the spatial broken symmetries in the two-dimensional (2D), quarter-filled band with strong electron-electron interactions that provides a microscopic model of the 2:1 cationic organic charge-transfer solids (CTS's). First, in direct contradiction to the predic…
Ferroelectric Bi3.25La0.75Ti3O12 (BLT) thin films were prepared on platinum coated silicon substrate by chemical solution deposition. The layered-perovskite phase was obtained by rapid thermal annealing the spin-on films at 650 or 700 °C for 180 s. Scanning electron micrographs showed uniform surfaces composed of sphe…
The modification of the elastic properties of giant magnetostriction alloy films due to an applied magnetic field (the ΔE effect), has been studied. Two different types of films were deposited on Si substrates: (i) single layers of TbDyFeCo alloys typically 1000 nm thick and (ii) nanocomposite multilayer films of FeCo…
Initial behavior and the subsequent motion of a bubble in liquid nitrogen are investigated experimentally using high-speed photography. A bubble is generated by focusing a pulsed ruby laser into liquid nitrogen at 78.0 K, changing the ambient pressures up to 253.2 kPa which corresponds to the applied pressure (or over…
The new compounds, Sr6Sb6S17, Ba2.62Pb1.38Sb4S10, and Ba3Sb4.66S10 were prepared by the molten polychalcogenide salt method. Sr6Sb6S17 crystallizes in the orthorhombic space group P2(1)2(1)2(1) with a = 8.2871(9) A, b = 15.352(2) A, c = 22.873(3) A, and Z = 4. This compound presents a new structure type composed of [S…
Cuprous oxide (Cu 2 O) particles coated with polyacrylamide having diameters in the range from 4.8 to 8.6 nm were prepared by a chemical method. The optical absorption of these particles was found to be characterized by excitons with corresponding energies varying from 2.6 to 2.25 eV in the particle size range mention…