Materials Literature
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From studies of geological and coral skeleton aragonite, it was previously proposed that aragonite converts hydrothermally to hydroxyapatite (HA) in phosphate solution by a solid-state topotactic ion-exchange reaction in which the HA retains the orientation of the original aragonite. The present investigation of this…
Constant temperature molecular dynamics simulations were used to study solutions of flexible polyelectrolyte chains at nonzero concentrations with explicit counterions and unscreened coulombic interactions. Counterion condensation, measured via the self-diffusion coefficient of the counterions, is found to increase wi…
We report photocarrier time-of-flight measurements in diode structures made of highly porous crystalline silicon. The corresponding electron and hole drift mobilities are very small compared to homogeneous crystalline silicon. They show two additional signatures of semiclassical transport that are directly limited by…
Colloidal solutions and redispersible powders of nanocrystalline, lanthanide-doped YVO 4 have been prepared via a hydrothermal method at 200 °C. High-resolution transmission electron micrographs of size-selected samples show highly crystalline particles ranging in size from about 10 to 30 nm. The particles exhibit the…
After a brief historical survey, this paper introduces the notion of entropic model sets (cut and project sets), and, more generally, the notion of diffractive point sets with entropy. Such sets may be thought of as generalizations of lattice gases. We show that taking the site occupation of a model set stochastically…
Anions present in the synthesis gel (X = F -, Cl -, Br -, NO 3 -, and SO 4 2 - ) partly remain in the channels of mesoporous templated silicas prepared in basic media. Their lyotropic character and their concentration control the silanolate group (⋮SiO - ) density at the surfactant−inorganic interface through the elec…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTA Novel Construction of Living Polymerization by Neighboring Group Participation: Living Cationic Ring-Opening Polymerization of a Five-Membered Cyclic DithiocarbonateWonmun Choi, Fumio Sanda, and Takeshi EndoView Author Information…
Size-quantized CdS thin films were prepared by sequential underpotential deposition of S and Cd on Au(111). The prepared films in an aqueous solution containing triethanolamine as a sacrificial electron donor showed n-type photoelectrode behaviors. Action spectra of anodic photocurrents were red-shifted with an increa…
CeO 2 −ZrO 2 solid solutions were prepared by means of thermal decomposition of cerium zirconyl oxalate in an argon flow at 1273 K followed by oxidation at 673−873 K in air. The reduction behavior of the obtained CeO 2 −ZrO 2 powders was investigated and compared with the samples prepared by the other methods already…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTSolubilization in Confined Surfactant MesophasesR. Denoyel and E. Sabio ReyView Author Information Centre de Thermodynamique et Microcalorimétrie du CNRS, 26, rue du 141 RIA, 13003 Marseille, France, and Escuela de Ingenieras Industriales, Universidad de Extremadura Carretera d…
We have studied the small-deformation rheology of a (semi-) two-dimensional model network of spherical particles, representing an adsorbed monolayer of protein at a fluid−fluid interface. The particles are confined at the interface in a steep potential well. A percolating network is generated through the formation of…
This feature article presents an overview of a study of several different aromatic-functionalized amphiphiles fatty acid and phospholipid derivatives. These amphiphiles form organized assemblies when the fatty acids are spread as monolayers at the air−water interface or when the phospholipids are dispersed in aqueous…
The structural changes induced as a function of temperature in lamellar crystals of monodisperse oligoamides of nylon 6 and nylon 6 6 have been studied using differential scanning calorimetry, X-ray diffraction and electron diffraction. Three different types of solid-state transformations, differing in their mechanism…
The bi- and trinuclear iron(III) complexes [1,3-{Cp*(dppe)Fe(C⋮C−)} 2 (C 6 H 4 )][PF 6 ] 2 ( 2 2+ ) and [1,3,5-{Cp*(dppe)Fe(C⋮C−)} 3 (C 6 H 3 )] [PF 6 ] ( 3 3+ ) were prepared by oxidation of [1,3-{Cp*(dppe)Fe(C⋮C−)} 2 (C 6 H 4 )] or [1,3,5-{Cp*(dppe)Fe(C⋮C−)} 3 (C 6 H 3 )] with 2 or 3 equiv of [(C 5 H 5 ) 2 Fe][PF 6…
The crystal structure of rabbit muscle creatine kinase, solved at 2.35 A resolution by X-ray diffraction methods, clearly identified the active site with bound sulfates surrounded by a constellation of arginine residues. The putative binding site of creatine, which is occupied by a sulfate group in this analysis, has…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTTemplate-Imprinted Chiral Porphyrin AggregatesEmanuele Bellacchio, Rosaria Lauceri, Sergio Gurrieri, Luigi Monsù Scolaro, Andrea Romeo, and Roberto PurrelloView Author Information Dipartimento di Scienze Chimiche Università di Catania, Viale Andrea Doria 6 95125 Catani…
A sintered silicon carbide fiber-bonded ceramic, which consists of a highly ordered, close-packed structure of very fine hexagonal columnar fibers with a thin interfacial carbon layer between fibers, was synthesized by hot-pressing plied sheets of an amorphous silicon-aluminum-carbon-oxygen fiber prepared from an orga…
The electronic response of a two-dimensional (2D) electron system represents a key quantity in discussing one-electron properties of electrons in semiconductor heterojunctions, on the surface of liquid helium and in copper-oxide planes of high-temperature superconductors. We here report an evaluation of the wave-vecto…
We attempt to describe the stress distributions of granular packings using lattice-based layer-by-layer stochastic models that satisfy the constraints of force and torque balance and non-tensile forces at each site. The inherent asymmetry in the layer-by-layer approach appears to lead to an asymmetric force distributi…
We describe a rapidly converging algorithm for solving the Kohn--Sham equations and equations of similar structure that appear frequently in calculations of the structure of inhomogeneous electronic many--body systems. The algorithm has its roots the Hohenberg-Kohn theorem and solves directly for the electron density;…