Materials Literature
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Abstract The effects of molecular characteristics and processing conditions on melt‐drawing behavior of ultrahigh molecular weight polyethylene (UHMW‐PE) are discussed, based on a combination of in situ X‐ray measurement and stress–strain behavior. The sample films of metallocene‐ and Ziegler‐catalyzed UHMW‐PEs with a…
The electrothermal simulator developed in this work uses an iterative procedure that self-consistently couples a Monte Carlo electronic trajectory simulation with a fast Fourier series solution of the heat diffusion equation. Results presented in this paper are obtained from the simulation of In0.15Ga0.85As/Al0.28Ga0.…
In this letter, the radio-frequency (RF) transmission properties of single-walled carbon nanotubes (CNTs) have been characterized up to the frequency of 12 GHz in a carbon nanotube field-effect transistor (CNFET) configuration using a two-port S-parameter method for the first time. The RF characteristics of the CNTs w…
Vibrational spectra of BH(4)(-) and its isotopic analogues in a crystalline environment of alkali metals cations (K(+), Rb(+), Cs(+)) have been investigated beyond the harmonic approximation using a variational approach supported by computations of B3LYP type anharmonic force fields. From the comparison of the observe…
Metal catalyzed, CVD-grown silicon nanowires decorated by chemical assembly of closely spaced Ag nanocrystals were modified with the well-known "silver mirror" reaction and investigated as substrates for surface-enhanced Raman (SERS) and hyper-Raman (SEHRS) spectroscopy. Four chromophores were examined: Rhodamine 6G,…
Abstract The crystal unit‐cell structures and the isothermal crystallization kinetics of poly( L ‐lactide) in biodegradable poly( L ‐lactide)‐ block ‐methoxy poly(ethylene glycol) (PLLA‐ b ‐MePEG) diblock copolymers have been analyzed by wide‐angle X‐ray diffraction and differential scanning calorimetry. In particular…
Aggregation in coordinating solvents: A giant oxido cluster [Bi38O45(hfac)24] (hfac=hexafluoroacetylacetonate), formed in solutions of bismuth oxido diketonate [Bi9O7(hfac)13], has been isolated and fully characterized. The [Bi38O45]24+ core (see picture: orange Bi, red O; central Bi6O9 unit is highlighted) is capped…
Tissue engineering requires the delivery and survival of cells to organ sites needing repair. Previously, we showed that an active laminin peptide (AG73: RKR-LQVQLSIRT)-conjugated chitosan membrane promoted cell adhesion and spreading in vitro. Here, we seeded human keratinocytes onto AG73-chitosan membranes and found…
Abstract The work details the electrocatalysis of oxygen reduction reaction (ORR) in 0.5 M H 2 SO 4 medium on a modified electrode containing a film of polyaniline (PANI) grafted multi‐wall carbon nanotube (MWNT) over the surface of glassy carbon electrode. We have fabricated a novel modified electrode in which conduc…
In this letter, the authors report on the high-frequency (HF) performance of self-assembled carbon nanotube field-effect transistors. HF device structures including a large number of single-wall carbon nanotubes have been designed and optimized in order to establish a new state of the art. The device exhibits a curren…
Nonthermal RF plasma modification has been applied to alumina-supported Pd catalysts for selective hydrogenation of acetylene in the presence of ethylene. High ethylene selectivity and good acetylene conversion activity were obtained at low temperatures on the H 2 plasma-treated catalyst without the in situ reduction…
We report a calibration-free method for the determination of chiral indices $(n,m)$ of single-walled carbon nanotubes from their electron diffraction patterns based on Bessel function analysis of the diffracted layer lines. An approach has been developed for confident identification of the orders of the Bessel functio…
The well-defined one-electron steps in the voltammetry of solutions of the nanoparticles Au38(SC2Ph)24 and Au140(SC6)53 (SC2Ph = phenylethanethiolate; SC6 = hexanethiolate) enable preparation of solutions containing, for example, Au38(SC2Ph)24 and Au38(SC2Ph)24+(ClO4)- nanoparticles in known relative proportions. From…
We report pump-probe transient absorption spectroscopy on carbon nanotubes with a high initial excitation density. We find that the recovery of the ground state optical absorption is well described by a $1∕\sqrt{t}$ relaxation, indicating that the long time population relaxation is controlled by one-dimensional diffus…
The anion-exchange properties of second-stage [Zn 2 Cr(OH) 6 ]Cl 0.5 (succinate) 0.25 · n H 2 O (Zn 2 Cr-Succ/Cl) and [Zn 2 Cr(OH) 6 ]Cl 0.5 (tartrate) 0.25 · n H 2 O (Zn 2 Cr-Tart/Cl) materials were investigated by means of time-resolved in situ energy-dispersive X-ray diffraction (EDXRD). Selective anion-exchange re…
Eines nach dem anderen: Dünne Filme der [Fe(pyrazin){M(CN)4}]-Koordinationspolymere (M=Ni, Pd oder Pt) wurden sequenziell durch koordiniertes Binden an Goldoberflächen erhalten (siehe Schema). Diese Multischichten zeigen bei Raumtemperatur Spin-Crossover-Phänomene mit Hysterese.
A general and efficient synthesis of fused five-membered porphyrins from the readily available beta-brominated porphyrins via palladium-catalyzed intramolecular cyclization has been developed, which can be applied for various metal complexes of beta-brominated porphyrins or free base ones and generally results in good…
Partial oxidation of propene is promoted by Au following deposition of atomic oxygen (0.3 ML) via O3 decomposition on Au(111) at 200 K. Several partial oxidation products--acrolein, acrylic acid, and carbon suboxide (O=C=C=C=O)-are produced in competition with combustion to CO2 and H2O. Acrolein is the primary partial…
Carboxylate-bridged complexes of transition metals, M(II)=Mn(II), Fe(II), Co(II), Ni(II), Zn(II), were synthesised by reaction of M(II) salts with dl-malate and L-malate under hydrothermal conditions. These complexes form four series of compounds, which have been fully characterised structurally, thermally and magneti…
We have prepared the nanocomposites of a polyether-type waterborne polyurethane (PU) incorporated with different amounts (17.4-174 ppm) of gold (Au) nanoparticles ( approximately 5 nm). The nanocomposite containing a certain amount (43.5 ppm) of gold was previously demonstrated to possess the optimal thermal and mecha…