Materials Literature
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Extensive simulations of PAMAM dendrimer generation 2 were performed at several pH conditions with explicit water molecules, to obtain proper conditions and validity for additional simulations without explicit water. Within the range of validity, simulation without water greatly extends the size and duration of practi…
Here we report a simple and versatile technique for the preparation of novel macroporous three-dimensional gold and platinum films with regular submicron spherical holes arranged in a close-packed structure. Gold and platinum films were prepared by electrochemical reduction of gold or platinum complex ions dissolved i…
We perform molecular dynamics simulations of a bead−spring polymer melt surrounding a nanoscopic particle. We explore the effect of the polymer/nanoparticle interactions, surface-to-volume ratio, and boundary conditions on both the structure and dynamics of the polymer melt. We find that the chains near the nanopartic…
Abstract A series of perovskite‐type oxides and derived Ag catalysts were prepared, and characterized by N 2 ‐adsorption, X‐ray diffraction and X‐ray photoelectron spectroscopy. The influences of pretreatment and Ag loading on catalytic activity for diesel soot oxidation were also investigated. Prereduction resulted i…
A simple way of analyzing the atomic displacements in perovskite alloys is used to determine the optical phonons contributing to their low-temperature ferroelectric properties. This determination (i) leads to the identification of three different kinds of solid solutions, (ii) reveals why simple theoretical models can…
The structure and bonding in [M7O24]6− isopolyanions of Mo and W have been investigated using density-functional methods. Good computational–experimental agreement for the geometrical parameters has been obtained. The electronic structure of the anions has been probed with molecular-orbital and Mulliken–Mayer methods.…
Abstract Heat treatment of polymer‐based composites is critical for the enhancement of both stability and long‐term service life, especially when the materials function under an inconstant temperature environment. The present article discusses the effect of heat‐treatment conditions on the electrically conductive prop…
This article describes the design and development of a novel membrane-encased polymer millirod for the sustained release of an anticancer drug, 5-fluorouracil (5-FU). The millirod consists of two functional compartments: (1) an inner 5-FU-loaded monolithic millirod as the drug depot, and (2) an outer NaCl-impregnated…
Porphyrin accumulation onto a self-assembled monolayer (SAM) of imidazole-substituted porphyrins by a supramolecular method to form a chain structure leads to significant increase of light absorption in the visible light region and therefore photocurrents.
Mesoporous molecular sieves SBA-15, and MAS-7 and MTS-9 synthesized from zeolite primary structure units, are characterized by high-resolution transmission electron microscopy (HRTEM). Direct observation of the micropores within these mesoporous materials via HRTEM is presented. And nanorange ordered microporosity is…
Cattiite, Mg 3(PO4)2·22H2O, is a new mineral from Zhelezny (Iron) Mine (Kovdor carbonatite massif, Kola Peninsula, Russia). It appears as crystalline mas- ses up to 1.5cm in size filling up cavities of dolomite carbonatite. Associated min- erals are dolomite, bakhchisaraitsevite, nastrophite, magnetite, sjogrenite and…
A high-quality β-Zn 3 BPO 7 crystal up to 43 × 43 × 12 mm in size has been grown from the melt by the top-seeded growth method. The obtained crystal crystallizes in a well-defined morphology of short triangular prism which is bound by {110} and {001} forms. The X-ray powder diffraction data of β-Zn 3 BPO 7 crystal wer…
Two new octanuclear cages are reported which feature formate as a bridging carboxylate which has been formed in situ from decomposition of triphenylacetate used as a ligand.
The filling of carbon nanotubes with Fe–Ni alloy via wet chemistry is presented. Crystalline Fe–Ni alloy nanoparticles consisting of Fe (75 at%) and Ni (25 at%), with diameters in the range of 5–10 nm and lengths of 10–50 nm, have been successfully introduced into carbon nanotubes. We anticipate that this method will…
We have produced layered-silicate−lamellar triblock copolymer nanocomposites possessing a uniaxial texture. Solution blending of the layered-silicate suspension with a block copolymer solution and subsequent roll-casting or static casting and annealing resulted in a partially immiscible and intercalated structure with…
ADVERTISEMENT RETURN TO ISSUEPREVReviewNEXTThermal AnalysisSergey VyazovkinView Author Information Department of Chemistry, University of Alabama at Birmingham, 901 South 14th Street, Birmingham, Alabama 35294 Cite this: Anal. Chem. 2002, 74, 12, 2749–2762Publication Date (Web):April 19, 2002Publication History Publis…
Reaction of cobalt(II) salts with the thiosalicylate dianion under hydrothermal conditions yields green lamellar Co((O2C)(S)C6H4) which displays canted antiferromagnetism.
The volume dependent electronic structure of the spinel-type lithium manganese oxides ${\mathrm{Li}}_{x}{\mathrm{Mn}}_{2}{\mathrm{O}}_{4},$ $x=0,0.5,1,$ is studied ab initio by employing a full-potential electronic structure method. The electronic structure, total energies, open-circuit voltage, and magnetic moments w…
The rate of axial water exchange in well-defined series of lanthanide complexes depends on the extent of second sphere hydration which is determined by complex hydrophobicity and the nature of the lanthanide ion and its counter-ion.
A recent analytic expression for the $\ensuremath{\sigma}$ bond order of $\mathrm{sp}$-valent systems with open structures is generalized to close-packed structures. This requires the retention of both the four-member ring contribution and the second-order embedding-type terms which arise naturally within the tight-bi…