Materials Literature
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A critical review of crystallographic studies on sillenite compounds has allowed us to develop a general structural formula for the stoichiometric sillenites: Bi 12 (Bi 4/5 - nx M n + 5 x )O 19.2+ nx . We defined the stoichiometric sillenites as those with an oxygen sublattice that is fully occupied by either oxygen i…
We investigated the effect of temperature on the growth rate and structure of carbon nanotubes using scanning electron microscopy, transmission electron microscopy, and Raman spectroscopy. The carbon nanotubes were grown vertically aligned on iron nanoparticle deposited silicon substrate by thermal chemical vapor depo…
The intrinsic stacking-fault energies and free energies for Ag, Cu, and Ni are derived from molecular-dynamics simulations using the empirical tight-binding potentials of Cleri and Rosato [Phys. Rev. B 48, 22 (1993)]. While the results show significant deviations from experimental data, the general trend between the e…
A recent experiment by Shimizu et al. has provided evidence of a superconducting phase in hcp Fe under pressure. To study the pressure-dependence of this superconducting phase we have calculated the phonon frequencies and the electron-phonon coupling in hcp Fe as a function of the lattice parameter, using the linear r…
By monitoring changes in excitonic photoluminescence (PL) that are induced by terahertz (THz) radiation, we observe resonant THz absorption by magnetoexcitons in GaAs/AlGaAs quantum wells. Changes in the PL spectrum are explored as a function of temperature and magnetic field, providing insight into the mechanisms whi…
A brief introduction to the projector augmented wave method is given and recent developments are reviewed. The projector augmented wave method is an all-electron method for efficient ab-initio molecular dynamics simulations with the full wave functions. It extends and combines the traditions of existing augmented wave…
Highly luminescent thiol-capped CdTe and HgTe nanocrystals synthesized in aqueous solutions were subject to a partial exchange of capping ligands with 1-dodecanethiol and transferred into different nonpolar organic solvents. It was found that acetone plays an important role in an efficient phase transfer of the nanocr…
Nanoparticles of CdTe were found to spontaneously reorganize into crystalline nanowires upon controlled removal of the protective shell of organic stabilizer. The intermediate step in the nanowire formation was found to be pearl-necklace aggregates. Strong dipole-dipole interaction is believed to be the driving force…
Abstract We prepared triphenylamine (TPA)‐containing polymers by a direct oxidative‐coupling method, which showed high thermostability, good solubility, high quantum efficiency, and blue light emission. The polymers are characterized by Fourier transform infrared spectroscopy, 1 H‐NMR, ultraviolet–visible spectroscopy…
A commercial block copolymer poly(ethylene oxide)−poly(propylene oxide)−poly(ethylene oxide) (PEO−PPO−PEO) sold under the trade name of Pluronic F108 was adsorbed on polystyrene (PS) latex particles. The adsorption isotherm of the copolymer on the PS latex particles was measured using an indirect method (colorimetric…
Traditionally, the corrosion behaviour of container materials can be predicted by extrapolation from relatively short-term experiments. Approaches to life prediction are described for two kinds of materials: carbon steel (corrosion allowance material) which must resist general corrosion, and passive materials (corrosi…
13 C NMR progressive saturation measurements were used to investigate longitudinal relaxation in the crystal phase of semicrystalline alkanes. Novel monodisperse, ultralong n -alkanes were melt crystallized in such a way that they comprised crystals containing extended chains or once-folded chains. The crystalline mor…
This letter reports the self-assembly and analysis of CdSe nanocrystal monolayers on both p - and n -doped GaAs substrates. The self-assembly was performed using a 1,6-hexanedithiol self-assembled monolayer (SAM) to link CdSe nanocrystals to GaAs substrates. Attenuated total reflection Fourier transform infrared spect…
It is well known that in addition to the longitudinal modulus, viscoelastic liquids show a shear stiffness at sufficiently high probe frequencies due to structural relaxations. For probe frequencies that are large compared to the structural relaxation frequency, the measured elastic longitudinal and shear moduli becom…
Novel composite nanotubes, consisting of NbS 2 -sheathed carbon nanotubes (CNTs), have been generated successfully employing carbon nanotube template-promoted growth. Detailed experimental procedures, and the associated intermediate oxide phases during NbS 2 conversion, have been evaluated using high-resolution transm…
The one-electron oxidized linear pentanuclear nickel complexes [Ni(5)(tpda)(4)(H(2)O)(BF(4))](BF(4))(2) (1) and [Ni(5)(tpda)(4)(SO(3)CF(3))(2)](SO(3)CF(3)) (2) have been synthesized by reacting the neutral compound [Ni(5)(tpda)(4)Cl(2)] with the corresponding silver salts. These compounds have been characterized by va…
A layered vanadium phosphate [V4O7(HPO4)2(2,2′-bipy)2] was synthesized and characterized (elemental analysis, IR and thermal analysis) by the hydrothermal reaction of NaVO3·2H2O, ZnO, H3PO4, 2,2′-bipy and water. The compound [V4O7(HPO4)2(2,2′-bipy)2] exhibits a unique 4,6,8-net structure with organonitrogen donors of…
Abstract Acoustic properties of nitrile butadiene rubber (NBR) specimens with carbon black as filler were investigated with different sulfur contents in the frequency range of 300‐1000 kHz. Their mechanical properties, such as density, hardness, tensile strength, were conventionally measured and correlated with their…
The photochemical and subsequent thermal reactions of the mouse short-wavelength visual pigment (MUV) were studied by using cryogenic UV-visible and FTIR difference spectroscopy. Upon illumination at 75 K, MUV forms a batho intermediate (lambda(max) approximately 380 nm). The batho intermediate thermally decays to the…
Abstract Polyaluminocarbosilane (PACS) as the precursor of high‐temperature resistant SiC fibers was synthesized by reacting polycarbosilane (PCS) with aluminum(III)acetylacetonate [Al(AcAc) 3 ] at 310°C in N 2 under ambient pressure. The reaction mechanism and the structure of PACS were investigated in detail by FTIR…