Materials Literature
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Based on the boron nitride thermodynamic equilibrium phase diagram, a thermodynamic analysis in nanoscale was proposed, with respect to the effect of nanosize-induced additional pressure on Gibbs free energy of critical nuclei of cubic boron nitride (c-BN), to elucidate nucleation of c-BN in a high-pressure and high-t…
The origin of perpendicular anisotropy in Co/Pd multilayers has been investigated. We examined this question by studying multilayers in which the total equivalent thicknesses of Co and Pd are kept constant, but in which the Co/Pd interface is progressively alloyed using codeposition of the two elements. The multilayer…
The relative dielectric constant of epitaxial BaTiO3 thin films deposited on MgO was determined over the frequency range from 0.05 to 40.05 GHz. Coplanar stripline waveguides were formed on the BaTiO3 films and the dielectric constant was determined by matching the reflection (S11-) parameter by measurement with that…
The limit of the Rayleigh scattering and total losses in silica fiber was determined from the results of the Rayleigh scattering and structural relaxation measurements. Annealing condition during fiber drawing was optimized, and much potential to reduce the Rayleigh scattering loss has been verified. Total loss can be…
First-principles density-functional theory (DFT) calculations of single-walled phosphorus nanotubes constructed from the black-phosphorus (b-P) layered allotrope show that their strain energies per atom for radii above 0.6 nm are comparable to the strain energies predicted for experimentally observed single-walled car…
A series of tetraalkynylplatinate(II) complexes, (NBu(4))(2)[Pt(Ctbd1;CR)(4)] (R = C(6)H(4)N-4, C(6)H(4)N-3, and C(6)H(3)N(2)-5), and the diynyl analogues, (NBu(4))(2)[Pt(Ctbd1;CCtbd1;CR)(4)] (R = C(6)H(5) and C(6)H(4)CH(3)-4), have been synthesized. These complexes displayed intense photoluminescence, which was assig…
Spinel ferrite CoCr x Fe 2 - x O 4 nanoparticles over a compositional range 0 < x < 1 were synthesized using a reverse micelle microemulsion method. This method provided excellent control over the composition and gave a reasonable size distribution. Upon increased Cr substitution, the blocking temperature, saturation…
The structural and morphological evolution of shear-induced crystallization precursors generated by pulling a single fiber through a thin layer of molten isotactic polystyrene (i-PS) has been spatially resolved by simultaneous small- and wide-angle X-ray microdiffraction in samples with different thermomechanical hist…
Dihydrofolate reductase (DHFR) has several flexible active site loops that facilitate ligand binding and catalysis. Previous studies of backbone dynamics in several complexes of DHFR indicate that the time scale and amplitude of motion depend on the conformation of the active site loops. In this study, information on…
Water-soluble polyphosphazenes emerge as an important class of biologically active macromolecular compounds dictating the need for the development of their well-defined and controlled synthesis. The synthetic pathway leading to biologically active polyphosphazenes involves preparation and chemical transformation of in…
The charge density distribution has been determined for a transition metal cyanide, RbMn[Fe(CN)(6)], by means of the maximum entropy-Rietveld method combined with the highly angularly resolved synchrotron radiation x-ray powder diffraction at SPring-8 BL02B2. We directly observed a charge transfer from the Mn site to…
Reduction of the interfacial friction for the contact of a silicon oxide surface with sodium borosilicate in aqueous solutions has been accomplished through the adsorption of poly(L-lysine)-graft-poly(ethylene glycol) on one or both surfaces. Spontaneous polymer adsorption has been achieved via the electrostatic attra…
Three unsymmetrical ditopic hexadentate ligands coded for the recognition of trivalent lanthanide ions have been synthesized, L(AB), L(AC), and L(BC), where A represents a benzimidazole-pyridine-benzimidazole coordination unit, B a benzimidazole-pyridine-carboxamide one, and C a benzimidazole-pyridine-carboxylic acid…
Getting under the surface of aging: The bulk structure of copper nanoparticles can be tailored during the preparation by exploiting known structure–activity relationships. Ageing of freshly precipitated precursors leads to characteristic phase transitions and enables control of microstrain and particle size (see pictu…
We present a unified view of the transport properties of small polarons in the Holstein model at low carrier densities, based on the dynamical mean-field theory. The nonperturbative nature of the approach allows us to study the crossover from classical activated motion at high temperatures to coherent motion at low te…
The Protein Data Bank (PDB; http://www.pdb.org) is the primary source of information on the 3D structure of biological macromolecules. The PDB's mandate is to disseminate this information in the most usable form and as widely as possible. The current query and distribution system is described and an alpha version of t…
Temperature dependence of blinking in SERS (surface enhanced raman scattering) signal, which is abrupt repeated intensity and peak frequency fluctuation, was studied. It was found that the blinking observed at room temperature (RT) was suppressed by cooling to 77 K for one-third to one-fourth of the particles and reco…
Hierarchical self-assembly: Oligo(p-phenylenevinylene)s with pendant diamino triazine moieties can self-assemble through hydrogen-bonding interactions to give hexameric rosettes (see picture, left). These rosettes further organize into large supramolecular tubules (right) with perfect space filling.
Ultrathin films of polystyrene were deposited on the surfaces of carbon nanofibers using a plasma polymerization treatment. A small percent by weight of these surface-coated nanofibers were incorporated into polystyrene to form a polymer nanocomposite. The plasma coating greatly enhanced the dispersion of the nanofibe…
The Macromolecular Structure Database (MSD) group (http://www.ebi.ac.uk/msd/) continues to enhance the quality and consistency of macromolecular structure data in the Protein Data Bank (PDB) and to work towards the integration of various bioinformatics data resources. We have implemented a simple form-based interface…