Materials Literature
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Carbon nanotubes are quasi one-dimensional nanostructures with unique eletrical prroperties that make them prime candidates for molecular electronics, which is certainly a most promising direction in nanotechnology. Early theoretical works predicted that the electronic properties of "ideal" carbon nanotubes depend on…
We report a new nonwrapping approach to noncovalent engineering of carbon nanotube surfaces by short, rigid functional conjugated polymers, poly(aryleneethynylene)s. Our technique not only enables the dissolution of various types of carbon nanotubes in organic solvents, which represents the first example of solubiliza…
The crystal structure of the title compound, [FeCl(2)(C(4)H(8)O(2))(H(2)O)(2)](n), contains six-coordinate Fe(II) atoms in approximately octahedral environments. The Fe(II) atoms have 1 symmetry, i.e. all pairs of identical ligands are trans. The structure consists of polymeric chains made up of dioxane molecules, in…
In the absorption spectrum of the crystal there was stated the presence of Ti3+ ions at octahedral Ga positions in strong crystal field. Ti3+ ions arise due to some reducing conditions of the crystal growth. It was found that electron delocalization at higher temperature, e.g. In oxidation-reduction reaction: Ti4+ + e…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTPreparation and Rheological Properties of Emulsion GelsAnne Koenig, Pascal Hébraud, and Patrick PerrinView Author Information Laboratoire de Physico-Chimie Macromoléculaire, UMR 7615, Ecole Supérieure de Physique et Chimie de Paris (ESPCI), CNRS, Université Pierre et Marie Curi…
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…