Materials Literature
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Magnetic instability in both ultra-pure and carbon-doped MgB2 films is investigated by magneto-optical imaging, transport and bulk magnetization measurements. In the carbon-doped MgB2 thin film, familiar dendritic flux-jump patterns were observed at low temperature as reported in previous experiments. In the ultra-pur…
A new far-field optical microscopy technique capable of reaching nanometer-scale resolution has been developed recently using the in-plane image magnification by surface plasmon polaritons. This microscopy is based on the optical properties of a metal-dielectric interface that may, in principle, provide extremely larg…
We propose a model which could explain some of the unusual magnetic properties observed for the one-dimensional helical spin system $\mathrm{Co}{(hfac)}_{2}\mathrm{N}\mathrm{I}\mathrm{T}\mathrm{Ph}\mathrm{O}\mathrm{Me}$. One of these properties is that the magnetization shows some plateaus if a magnetic field is appli…
Light illumination of thin crystals of CDW conductor TaS$_3$ is found to result in dramatic changes of both linear ($G$) and nonlinear conduction. The increase of $G$ is accompanied by suppression of the collective conduction, growth of the threshold field $E_T$, and appearance of the switching and hysteretic behavior…
We present the computation of structural and polarization for a ferroelectric polymer, specifically, the beta-phase of poly(vinylidene fluoride) or (-CH$_2$-CF$_2$-)$_n$. Two structures have been described in the literature: one containing an undistorted carbon backbone (planar-zigzag) and the other containing alterna…
The layered iodate Cs2I4O11 has been synthesized and characterized. Its hexagonal tungsten oxide-like framework consists of six-membered rings of corner-sharing IO5 polyhedra with three lone pairs pointing inward and three lone pairs pointing outward (depicted for central ring). Capping of the layer by asymmetric IO3…
A novel bottom-up approach to obtain polymer nanocomposites using cubic silsesquioxanes (POSS) nanoparticles as building blocks is reported. The design is based on associative interaction between particles to form ordered nanostructure and limited crystal growth to render anisotropic shapes. Specifically, the affinity…
A DNA microarray-based global transcript profiling of Escherichia coli in response to cold shock showed that in addition to the known cold shock-inducible genes, new genes such as the flagellar operon, those encoding proteins involved in sugar transport and metabolism, and remarkably, genes encoding certain heat shock…
We investigate the viscoelastic properties of an associating rigid rod network: aqueous suspensions of surfactant stabilized single wall carbon nanotubes (SWNTs). The SWNT suspensions exhibit a rigidity percolation transition with an onset of solidlike elasticity at a volume fraction of 0.0026; the percolation exponen…
Prussian blue (PB) nanoparticles protected by organic polymers such as poly(vinylpyrrolidone) (PVP) and poly(diallyldimethylammonium chloride) (PDDA) were prepared. Different experimental conditions (concentrations of Fe ions and feed ratios of Fe to the polymers) have been investigated to control the size of the PB n…
A tube for electrons: Through π–π and Coulomb interactions, a complex is obtained between carbon nanotubes grafted with pyrene+ (1) and the zinc porphyrin complex 2. Photoexcitation of the resulting donor–acceptor assembly is followed by a rapid and efficient charge separation to generate a charge-separated state that…
The quantum de Haas-van Alphen (dHvA) and Shubnikov-de Haas oscillations measured in graphite were decomposed by pass-band filtering onto contributions from three different groups of carriers. Generalizing the theory of dHvA oscillations for 2D carriers with an arbitrary spectrum and by detecting the oscillation frequ…
Within or without: With the use of a coaxial, dual-capillary spinneret, electrospinning has been demonstrated as a versatile tool to fabricate hollow nanofibers with either their outer or inner surfaces being functionalized by molecular species or nanoparticles (the pictures show schematic cross sections of the functi…
Thin film networks of multiwalled carbon nanotubes (MWCNTs) were prepared by exerting chemically induced capillary forces upon the nanotubes. During this process MWCNTs undergo a transformation from being a vertically aligned structure to an interlocking resistive network of interconnected nanotubes, whose main featur…
Abstract An overview of the recent literature on combustion and flame‐retardancy of epoxy resins is presented. A brief overview of the structures of cured epoxy resins is also presented as a background for better understanding of the thermal decomposition and combustion phenomena. The literature sources were mostly ta…
We apply ultrafast spectroscopy to establish a time-domain hierarchy between structural and electronic effects in a strongly correlated electron system. We discuss the case of the model system ${\mathrm{VO}}_{2}$, a prototypical nonmagnetic compound that exhibits cell doubling, charge localization, and a metal-insulat…
Black single crystals of Ni(dmit)(2) complex (dmit: 2-thioxo-1,3-dithiole-4,5-dithiolate) with trans-4-[2-(1-ferrocenyl)vinyl]-1-methylpyridinium chromophore as a countercation, (FcCHCHPymCH(3))[Ni(dmit)(2)](3), were prepared by the electrocrystallization technique. In the triclinic structure of the complex (P, a = 11…
This paper presents the results of the hypervelocity projectile bombardment of a gold-coated beryllium substrate telescope mirror. Individual latex (ρ = 1.1 g/cm<sup>3</sup>) and iron (7.9 g/cm<sup>3</sup>) projectiles, in the size range 0.70 to 1.44μm (avg. mass = 0.24 - 7.1 x 10<sup>-15</sup> kg), represen…
Form I (HT) and form III (LT) of pleconaril are enantiotropically related with a calculated temperature of transition T τ = 35.7 °C (supposing an ideal behavior). Structural data obtained from single crystal X-ray diffraction at 100 K and room temperature show that (i) form I (HT) can be described as a network of dime…
CDP-6-deoxy-L-threo-D-glycero-4-hexulose-3-dehydrase (E(1)) catalyzes the C-3 deoxygenation in the biosynthesis of 3,6-dideoxyhexoses in Yersinia pseudotuberculosis. E(1) is a pyridoxamine 5'-phosphate (PMP)-dependent enzyme that also contains a [2Fe-2S] center. This iron-sulfur cluster is catalytically essential, sin…