Materials Literature
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Demands for thermal control in IC chips are more rigorous with increasing power dissipation in electronic devices. The thermal interface material forms an important passage for efficient heat transfer in the chip, and a study has been done to analyze the thermal performance of a particular type of polymeric thermal in…
Abstract A tripodal hexadentate ligand containing three imidazole groups gives spin-crossover iron complexes in both the +II and the +III oxidation states. The tetrafluoroborate salt of the Fe(II) complex shows a gradual spin transition in the temperature range 110–270 K. The corresponding Fe(III) complex shows a spin…
We analyze refraction of electromagnetic wave packets on passing from an isotropic positive to an isotropic negative-refractive-index medium. We definitively show that in all cases the energy is always refracted negatively. For localized wave packets, the group refraction is also always negative.
Abstract We report a novel water-free processing of monodisperse and pure Cu2S nanocrystals (NCs) by thermolysis of copper–dodecanethiol complex. The narrow size distribution led to the formation of ordered self-assemblies with various well-defined structures. However, unclose-packing structure was observed as a predo…
We report on the magnetic properties and magnetocaloric effects of Mn5Ge3−xGax compounds with x=0.1, 0.2, 0.3, 0.4, 0.6 and 0.9. All samples crystallize in the hexagonal Mn5Si3-type structure with space group P63/mcm and order ferromagnetically. The Curie temperature of these compounds decreases with increasing x, fro…
The lattice parameter and thermal expansion coefficient (TEC) for the spinel-type ${\mathrm{Si}}_{3}{\mathrm{N}}_{4}$ phase prepared under high-pressure and high-temperature conditions are determined for $14\mathrm{K}<T<302\mathrm{K}$ by x-ray diffraction, at a synchrotron-radiation source, and for $0\mathrm{K}&…
We have performed semiempirical modified-neglect-of-diatomic-overlap (to determine the most stable geometrical arrangements) as well as ab initio density-functional theory calculations (to obtain the electronic structure and total energies) at $T=0$ to analyze the energetics and structural properties of OH species ads…
${}^{59}\mathrm{Co}$ nuclear magnetic resonance (NMR) studies have been made to clarify the spin-state and local magnetic properties of ${\mathrm{Nd}}_{1\ensuremath{-}x}{\mathrm{Sr}}_{x}{\mathrm{CoO}}_{3}$ $(0<~x<~0.5).$ Three different types of Co NMR spectra are obtained. The parent ${\mathrm{NdCoO}}_{3}$ exhi…
Nanometre-sized diamonds (nanodiamonds) are to date the most abundant presolar grains in primitive meteorites. They are therefore presumed to be an abundant component of the dust in the interstellar medium. What then are the expected spectroscopic signatures of these grains in the interstellar medium? In order to answ…
Abstract Modulation of luminescence intensity triggered by light input is demonstrated. The system consists of a Zn–porphyrin and an azopyridine derivative, which axially coordinates to Zn–porphyrin and quenches its fluorescence more efficiently in the trans-form than in the cis-form. Thus, light-induced isomerization…
Nucleation and growth of islands in epitaxy is simulated using a continuum phase-field model. In addition to local density of adatoms, a local phase-field variable, varying in the real space, is introduced to describe the epitaxial islands. Evolution of this phase field is determined by a time-dependent Ginzburg-Landa…
This article introduces the computational procedure FamClash for analyzing incompatibilities in engineered protein hybrids by using protein family sequence data. All pairs of residue positions in the sequence alignment that conserve the property triplet of charge, volume, and hydrophobicity are first identified, and s…
Summary The silicified bipartite cell walls of diatoms (Bacillariophyceae) are produced in intracellular compartments by precipitation from supersaturated Si(OH) 4 and are then externalized. Fossil evidence of silicification is for marine, probably neritic, centric diatoms from approx. 120 Mya. Regardless of the initi…
The fuel systems in advanced aircraft will subject the fuel to more severe thermal stress and increased recirculation than in current designs. This work was undertaken as part of a study to determine the impact of copper contamination on the suitability of current JP-5 fuels in such advanced aircraft systems. Three is…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTHierarchical Texture of Calcium Carbonate Crystals Grown on a Polymerized Langmuir−Blodgett FilmKimiyasu Sato, Yuri Kumagai, Koji Watari, and Junzo TanakaView Author Information Advanced Sintering Technology Group, Ceramic Research Institute, National Institute of Advanced Indu…
Three bimetallic assemblies with alternate homometallic bridges through chloride ligands and heterometallic bridges through cyanide ligands of formula [(323)(2)Cu(2)(Cl)M(CN)(6)](n).2n(H(2)O), where 323 = N,N'-bis(3-aminopropyl)ethylenediamine and M = Co(3+) for 1, Fe(3+) for 2, and Cr(3+) for 3, were synthesized. The…
The devitrification of polystyrene, PS, thin films, supported by oxidized silicon (SiO x /Si) wafers was examined under various conditions of CO 2 pressure and temperature using in situ spectroscopic ellipsometry. PS films in the thickness range of 15 nm < h < 200 nm were studied at temperatures from 25 to 75 °C. The…
Dimethyl sulfoxide (DMSO) is commonly used as a cosolvent to improve the aqueous solubility of small organic compounds. Its use in a screen to identify novel inhibitors of the enzyme NAD(+) synthetase led to this investigation of its potential effects on the structure and stability of this 60-kD homodimeric enzyme. Al…
Intermolecular electron transfer is investigated in a dye-doped polyelectrolyte (PE) multilayer film. Hollow PE capsules, with a mean diameter of 2 microm, were prepared by stepwise adsorption of a pyrene (PY)-labeled polyanion and various polycations onto charged colloids and subsequent dissolution of the colloidal c…
Intrinsic defect processes were compared for an extensive range of A3+B3+O3 compounds with A cation radii from Sc3+ to La3+ and B cation radii from Al3+ to In3+. Crossovers between cation antisite, Schottky and oxygen Frenkel disorder are predicted as a function of cation radius. The radiation tolerance of these compo…