Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTSynthesis of AgBr and SnO2 Microwires Induced by Mixed Surfactant Nematic Liquid Crystalline PhasesTsuyoshi Kijima, Takayuki Ikeda, Mitsunori Yada, and Masato MachidaView Author Information Department of Applied Chemistry, Faculty of Engineering, Miyazaki University, Miyazaki,…
The effect of rare earth and transition metal luminescent impurities on the optical properties of As<SUB>2</SUB>S<SUB>3</SUB> glass is studied in a wide spectral region. The Raman, IR, band- to-band and edge absorption spectroscopies are employed to obtain information about the incorporation of impurity ions in the ho…
A general, efficient method was developed to incorporate a variety of second metal ions into ultrathin TiO 2 films. The thin films were first prepared by the surface sol−gel process from a mixture of the matrix-forming titanium alkoxide and template magnesium alkoxide. Mg 2+ ion was removed by acid/base treatment, for…
The reaction of M(BF(4))(2).xH(2)O (M = Co, Ni, and Cu) and HC(3,5-Me(2)pz)(3) in a 1:2 ratio yields [Co[HC(3,5-Me(2)pz)(3)](2)](BF(4))(2) (2), [Ni[HC(3,5-Me(2)pz)(3)](2)](BF(4))(2) (3), and [Cu[HC(3,5-Me(2)pz)(3)](2)](BF(4))(2) (4). Over the temperature range from 5 to 350, 345, or 320 K, Curie law behavior is observ…
Modern combat aircraft are required to achieve aggressive maneuverability and high agility performance, while maintaining handling qualities over a wide range of flight conditions. Recently, a new adaptive-structural concept called variable stiffness spar is proposed in order to increase the maneuverability of the fle…
From a structural analysis using low-energy ion scattering spectroscopy, it is shown that Cu−phthalocyanine (CuPc) molecules adsorb on the Fe(100) surface with their planes parallel to the surface when the film thickness is one monolayer, while the structure of the film becomes disordered with an increase in the thick…
Simultaneous catalytic removal of NO x, SO x, and CO under simulated FCC regenerator conditions was investigated over mixed oxide catalysts CuMgAlO (Cu-cat), CeMgAlO (Ce-cat), and CuCeMgAlO (CuCe-cat), which were prepared by coprecipitation and characterized by XRD, XPS, and N 2 adsorption−desorption. At low temperatu…
The astonishing results of P. M. Ajayan et al. (“Nanotubes in a flash—ignition and reconstruction,” Brevia, 26 April, p. [705][1]) demonstrating ignition of carbon nanotubes after exposure to a photographic flash inspired us to make further explorations along the same lines. We found that similar effects can be obtain…
Recent experiments on the dehydrogenation−aromatization of methane (DHAM) to form benzene using a MoO 3 /HZSM-5 catalyst stimulated us to examine methane activation by the transition-metal oxide molecules, MO x (M = Cr, Mo, W; x = 1, 2, 3). The present studies use hybrid density functional theory (B3LYP). The reactivi…
We synthesized a surfactant-encapsulated polyoxoanion, (DODA) 16 As 4 W 30 Cu 4 O 112 ·114H 2 O (denoted SEC-1), which possesses a hydrophobic dimethyl dioctadecylammonium (DODA) shell and an encapsulated hydrophilic polyoxoanion core in organic phases. The novel organic/inorganic composite can form stable Langmuir mo…
The optical, structural, and magnetic properties of Co, Ni, and Co x Ni 100 - x (0 < x < 100) alloy nanoclusters in silica host obtained by the sol−gel route are presented. Throughout the entire range of composition investigated, from pure Ni to pure Co, the nanoclusters exhibit an fcc structure, with lattice paramete…
The in situ formed supramolecular assemblies of cyclodextrins with nonionic surfactants, poly(ethylene glycol), poly(propylene glycol), and block copolymer, so-called pseudopolyrotaxanes, were used as porogens for the generation of porous silica materials. The resulting structures are characterized with nitrogen sorpt…
The formation of silver nanoparticles in the presence of various macrocyclic thiol compounds in N,N ‘ -dimethylformamide (DMF) solution was investigated in situ through visible spectrophotometric and photon correlation spectroscopic measurements. While temperature, solvent nature, and the concentration of thiol compou…
Metallic nanoparticles (platinum and gold) encapsulated in mesoporous silica (SBA-15) were prepared in the same solution by a novel two-step method. Characterization by X-ray scattering and electron microscopy consistently shows that the metal nanoparticles were homogeneously incorporated in the mesopores (retaining t…
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…