Materials Literature
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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…
The structure of 2H CuScO 2 has been refined from single-crystal X-ray diffraction data obtained at room temperature and from neutron powder diffraction data obtained from 11 to 1206 K. Strong negative thermal expansion (−4.0 × 10 - 6 /K) has been found for the apparent Cu−O bond length below 300 K. This is the first…
Telechelic high molecular weight polystyrene (PS-A) and poly(methyl methacrylate) (PMMA-A) containing anthracene end groups undergo end-coupling reaction in THF solution to form [4 + 4] anthracene photodimers upon exposure to UV irradiation at wavelengths greater than 300 nm. A mixture of products is obtained that inc…
The present paper explores the possibility of orienting columnar discotic liquid-crystalline (LC) materials and causing a uniaxial “in-plane” orientation of the columns along the orientation direction. The discotic LCs employed were based on 2-hydroxy-3,6,7,10,11-penta(1-butoxy)triphenylene, which was derivatized with…
A series of gold nanoclusters stabilized by ligands containing short ethylene oxide oligomers of fixed length were prepared and characterized. The thiols CH 3 (OCH 2 CH 2 ) n SH (where n = 2, 3, and 4) were substituted onto the surface of 1.8-nm hexanethiol-capped gold clusters by a thiol-exchange reaction, and the re…