Materials Literature
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Abstract Free‐standing films of polyaniline (PANI), in an emeraldine base state, prepared by evaporation of polymer solutions in N ‐methylpyrrolidone (NMP) retain solvent even under dynamic vacuum drying as indicated by transmission Fourier transform infrared (FTIR) spectroscopy, where a band at 1670 cm −1 is clearly…
The interaction of a water molecule with a neutral oxygen vacancy on the MgO(100) surface is studied in the limit of very low coverage by total-energy calculations and molecular-dynamics simulations based on the density-functional theory. Exchange and correlation effects are treated within the generalized gradient app…
Carbon nitride $({\mathrm{CN}}_{x})$ films were deposited by reactive sputtering to study the effect of the ion bombardment during deposition (IBD) on their bonding structure. Fourier-transform infrared (IR) ellipsometry (FTIRE) was used to identify and distinguish the characteristic bands of the ${\mathrm{sp}}^{3}$ $…
A high-temperature Raman study of ${\mathrm{Ge}}_{x}{\mathrm{S}}_{1\ensuremath{-}x}$ alloys is reported up to a temperature close to the melting point, including both Ge-rich $(x=0.35)$ and S-rich $(x=0.20,0.30)$ glasses, as well as the compound glass $(g\ensuremath{-}{\mathrm{GeS}}_{2};$ $x=\frac{1}{3}).$ The variati…
We report a large scale synthesis of well-aligned carbon nanotube films with controllable diameter and length. A simple technique has been developed to measure anisotropic electrical transport properties of as-aligned carbon nanotube films. The temperature dependence of relative electrical resistances suggests that mo…
Two series of copolyimides, poly(quinoxaline perylene bisimide)s and poly(quinoxaline perylene bisimide ether)s, carrying quinoxaline units and varying amounts of substituted perylene bisimides in the main chain have been synthesized. The polymers were characterized by FT-IR, NMR, UV/vis, and fluorescence spectroscopy…
The identification and characterization of low levels of long-chain-branching (LCB) in essentially linear polyethylenes has attracted significant interest in recent years. One experimental technique is nuclear magnetic resonance (NMR), which can detect LCB in essentially linear polyethylene homopolymers for LCB in the…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTReal Time Reaction Dynamics in Carbon NanotubesToshiya Okazaki, Kazutomo Suenaga, Kaori Hirahara, Shunji Bandow, Sumio Iijima, and Hisanori ShinoharaView Author Information Department of Chemistry, Nagoya University Nagoya 464-8602, Japan Japan Science and Technology C…
Thin films of poly(vinyl alcohol) (PVA) polymer were prepared on a flat, nonporous, poly(styrene) support matrix by adsorption from aqueous solution and were characterized in order to investigate the nonspecific adsorption of proteins to a chromatographically relevant surface. The integrity and surface coverage of the…
We show that D-mode Raman scattering in single-walled carbon nanotubes is due to a double-resonant Raman process. The unusual shift of the D-mode frequency with excitation energy is even expected for a single nanotube. The magnitude of the shift and the D-mode frequency depend strongly on the tube's diameter and chira…
The collective behavior of dislocations in jerky flow is studied in Al-Mg polycrystalline samples subjected to constant strain rate tests. Complementary dynamical, statistical and multifractal analyses are carried out on the stress-time series recorded during jerky flow to characterize the distinct spatio-temporal dyn…
We have implemented a systematic LSDA and $\mathrm{LSDA}+U$ study of the double perovskites ${A}_{2}{\mathrm{FeReO}}_{6}$ $(A=\mathrm{B}\mathrm{a},\mathrm{S}\mathrm{r},\mathrm{C}\mathrm{a})$ and Sr${}_{2}M$MoO${}_{6}$ $(M=\mathrm{C}\mathrm{r},\mathrm{M}\mathrm{n},\mathrm{F}\mathrm{e},\mathrm{C}\mathrm{o})$ for underst…
The dynamic magnetic properties of the distorted perovskite system ${\mathrm{La}}_{0.7\ensuremath{-}x}{\mathrm{Y}}_{x}{\mathrm{Ca}}_{0.3}{\mathrm{MnO}}_{3}$ $(0<~x<~0.15)$ have been investigated by ac susceptibility and dc magnetization measurements, including relaxation and aging studies. All investigated sampl…
The crystal and magnetic structures of newly synthesized ${\mathrm{Sr}}_{1\ensuremath{-}x}{\mathrm{Ca}}_{x}{\mathrm{MnO}}_{3}$ $(0<~x<~1)$ and ${\mathrm{Sr}}_{1\ensuremath{-}y}{\mathrm{Ba}}_{y}{\mathrm{MnO}}_{3}$ $(y<~0.2)$ perovskite materials (of the $\mathrm{AB}{\mathrm{O}}_{3}$ type) were investigated usi…
The electronic transport properties through junctions connecting nanographite ribbons of different or same width are investigated by means of the Landauer-B\"uttiker approach using a tight binding model. Graphite ribbon with zigzag boundary has a single conducting channel of edge states in the low-energy regime. The e…
BACKGROUND: Molecular imaging of thrombus within fissures of vulnerable atherosclerotic plaques requires sensitive detection of a robust thrombus-specific contrast agent. In this study, we report the development and characterization of a novel ligand-targeted paramagnetic molecular imaging agent with high avidity for…
Abstract The glass‐transition temperatures ( T g ) of some polymers reported in the literature have always been a source of great uncertainty. The values reported for poly(methacrylonitrile) (PMAN, 100 and 120°C) are well above the value determined in this study (67°C). It is clearly shown by FTIR and DSC work that fo…
The electronic structures and spectra have been calculated using the INDO-single- and double-excitation configuration interaction method, and following combination with the sum-over-states method the dynamic third-order polarizabilities in the third-harmonic generation (THG), electric-field-induced second harmonic gen…
A Pb5Ge3O11 metal–ferroelectric–metal–oxide–silicon memory transistor has been fabricated. The device showed a memory window of about 2 V. The memory window was almost saturated at the operation voltage of 2 V. The “off” state drain current (ID) at VD of 0.1 V and VG of 0.5 V is about 1×10−8 A. The “on” state drain cu…
We report on the conductance of multiwalled carbon nanotubes as a function of voltage and temperature between room temperature and 4.2 K. The data show a monotonic decrease in conductance as the temperature is lowered. At temperatures below about 20 K, a nonlinearity develops in the $V(I)$ data, corresponding to a pro…