Materials Literature
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The influence of the preparation route on the microstructure of indium species in In−ZSM-5 catalysts for the selective reduction of NO by hydrocarbons has been investigated. Samples were prepared by aqueous ion exchange, by precipitation with or without previous ion exchange step, by reductive solid-state ion exchange…
Abstract Reactions producing Al‐rich index minerals in the south‐eastern part of the Lepontine Dome (Central Alps, Switzerland) are investigated using mineral distribution maps, microstructural observations and equilibrium phase diagrams. The apparent staurolite mineral zone boundary corresponds to the paragonite brea…
Aging was found to be an important step for obtaining high-surface-area zirconia aerogels prepared by the sol−gel method using zirconium n-propoxide and subsequent supercritical drying with carbon dioxide. A narrow and much sharper pore size distribution of calcined zirconia aerogels could be obtained only after exten…
The fabrication of cobalt oxide nanotubes (length 3−4 μm, width 200−400 nm) was achieved by a colloidal templating approach. In this approach, a Co(III)−cysteinato complex [Co(en) 2 (S-cys)] 2+ 2(BF 4 - ) was employed as the precursor of cobalt oxide. The infiltration behavior of the precursor into polyelectrolyte mul…
In this work, the formation of unusual flowerlike structures with 10-petals composed of BaSO 4 single crystalline platelets is described. The structures are obtained at pH 5 in an aqueous solution in the presence of a double hydrophilic block copolymer poly(ethylene oxide)- block -sulfonated poly(ethylene imine) (PEO-…
For fabrication of a planar array of 1D chains of gold nanoparticles prepared by a chemical process, the faceted (110) planes of sodium chloride crystals were used as templates to produce nanoscale ridge-and-valley structured carbon layers by a vacuum process. When these carbon layers loaded on copper grids were dippe…
Nanoscale tailored polymer crystalline morphology is studied in a polystyrene- b -poly(ethylene oxide) (PS- b -PEO) diblock copolymer with number-average molecular weights for the PS and PEO blocks being 17 000 and 11 000 g/mol, respectively. The PEO volume fraction is 0.39. After large amplitude planar reciprocating…
The study of the electron relaxation and dynamics of polaron charge carriers in undoped and ${\mathrm{H}}_{2}{\mathrm{SO}}_{4}$-doped polyaniline (PANI) by means 3-cm (9.7 GHz) and 2-mm (150 GHz) EPR spectroscopy, and ac, superconducting quantum interference device, and dc conductometries is reported. The existence in…
${\mathrm{CuS}}_{2}$ and ${\mathrm{CuSe}}_{2}$ with pyrite structures were systematically studied by transport, magnetization, and specific-heat measurements. In remarkable contrast to other $3d$ transition-metal pyrites, a clear indication of strong electron correlations was absent in the electronic properties of Cu…
Glass nanocomposites in the system (100 − x)Li2B4O7–xSrBi2Ta2O9 (0 ≤ x ≤ 22.5, in molar ratio) were fabricated via a melt quenching technique followed by controlled heat-treatment. The as-quenched samples were confirmed to be glassy and amorphous by differential thermal analysis (DTA) and X-ray powder diffraction (XRD…
The atomic and electronic properties of the O-deficient MgO(001) surface and effects of Au adsorption (0.25 monolayer) are investigated using the full potential linearized augmented plane wave method. The calculated formation energy of a surface (bulk) O vacancy on MgO(001) is 9.5 eV (10.0 eV). The vacancy induces gap…
We have carried out density-matrix renormalization group calculations on the ground state of long polyacene oligomers within a Pariser-Parr-Pople (PPP) Hamiltonian. The PPP model includes long-range electron correlations which are required for physically realistic modeling of conjugated polymers. We have obtained the…
A submicron light-emitting device (LED) was fabricated from lithographically fabricated parallel indium-tin oxide (ITO) finger electrodes (0.9 mum wide) separated by a 1.1 mum gap. A single layer of an amorphous (a) Ru(bpy)3(ClO4)2 film ( approximately 100 nm thick) was spin-coated on the electrode array. Ga:In or car…
The actual ambiguity in the interpretation of the Raman-active vibrations of tetragonal ${\mathrm{ZrO}}_{2}$ is discussed as a factor impeding progress in long-standing investigations of the polymorphism of zirconia. The reliable symmetry assignment of these vibrations is proposed by analyzing a polarized light scatte…
peer reviewed
On the basis of extended irreversible thermodynamics [D. Jou, J. Casas-Vazquez, and G. Lebon, Rep. Prog. Phys. 51, 1005 (1988); 62, 1035 (1999)] an analysis of the solid-liquid interface motion is presented. In addition to the formalism of the classic irreversible thermodynamics of Onsager and Prigogine, a space of in…
Photoelectron spectra of ${\mathrm{Al}}_{12}{X}^{\ensuremath{-}}$ $(X=\mathrm{C},$ Ge, Sn, Pb) were measured to probe the electronic structure of ${\mathrm{Al}}_{12}X.$ These clusters, all possessing 40 valence electrons, were expected to be magic numbers with ${I}_{h}\ensuremath{-}X@{\mathrm{Al}}_{12}$ structures, cl…
A series of [2]-rotaxanes has been synthesized in which two Zn(II)-porphyrins (ZnP) electron donors were attached as stoppers on the rod. A macrocycle attached to a Au(III)-porphyrin (AuP+) acceptor was threaded on the rod. By selective excitation of either porphyrin, we could induce an electron transfer from the ZnP…
Phonon dispersion relations of a two-dimensional (2D) graphite are obtained by fitting dispersive Raman modes that originate from nonzone center phonons near the $\ensuremath{\Gamma}$ or K point in the Brillouin zone (BZ). A new set of 12 force constants of 2D graphite up to the fourth neighbor are determined by a sel…
Multicomponent M(II)/Al/Zr layered double hydroxides (LDHs) with M(II) = Mg, Ni, and Zn, exhibiting single hydrotalcite-like phases by XRD, were obtained by coprecipitation at constant pH = 10. The cationic contents were close to those of the solutions, excepted for Zr, for which 95, 70, and 65 mol % of the amount in…