Materials Literature
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A todorokite-type magnesium manganese oxide molecular sieve material with a morphology of nanoribbons has been synthesized using a combination of techniques consisting of a sol−gel process to synthesize a nanosized tetraethylammonium manganese oxide layered material, an ion-exchange method to prepare a thin-film Mg−bu…
Abstract Dendritic polyarylether 2‐bromoisobutyrates of different generations (G n ‐Br, n = 1–3) as macroinitiators for the atom transfer radical copolymerization of N ‐hexylmaleimide and styrene in an ionic liquid, 1‐butyl‐3‐methylimidazolium hexafluorophosphate, were investigated. The copolymerization carried out in…
In methanol, the reaction of Mn(ClO(4))(2).6H(2)O and 1,2-bis(biacetylmonoximeimino)ethane (H(2)bamen) in the presence of triethylamine affords a trinuclear complex having the formula [Mn(3)(mu(3)-O)(mu(3)-bamen)(3)]ClO(4).2H(2)O. The structure of this complex shows a symmetric planar central [Mn(III)(3)(mu(3)-O)] uni…
The pressure–temperature phase diagram of BaTiO 3 has been investigated using a modification of the standard Landau potential to take account of quantum saturation of the order parameter at low temperatures. The calculated phase diagram agrees well with experiment for the cubic–tetragonal and tetragonal–orthorhombic t…
Various chain-end and in-chain functionalized polystyrenes with one, two, three, and four perfluorooctyl (C 8 F 17 ) groups with well-defined structures ( M n = (3.5−29) × 10 3 g/mol) were synthesized by the addition reaction of polystyryllithiums to phenol-functionalized agents such as 1-(4-bromobutyl)-4- tert -butyl…
Abstract Two ways of recovering the properties of the scrap plastics poly(ethylene terephthalate) (PET) and high‐density polyethylene (HDPE) were analyzed: (1) blending incompletely segregated polymers with a compatibilizer and (2) blending nonsegregated polymers with a small amount (2 pph) of another compatibilizer.…
Photocatalytic reactions of heterogeneous systems, probably the most complex catalytic reactions, are central to a wide variety of phenomena including those of evolution theory, energy conversion, and environmental cleanup. Although catalytic reactions are essentially surface driven, the effect of bulk structure is pa…
Palladium complexes immobilized onto generation 0-3 PAMAM dendrimers supported on silica were used as catalysts for the carbonylation of iodobenzene in methanol to form methyl benzoate. High yields were obtained and the catalyst was recycled 4-5 times without significant loss of activity. The carbonylation reaction wa…
It has been shown that a slab of materials with refractive index n = −1 behaves like a perfect lens focusing all light to an exact electromagnetic copy of an object. The original lens is limited to producing images the same size as the object, but here we generalize the concept so that images can be magnified. For two…
A 360-degree-viewable volumetric 3-D display has been developed by Actuality Systems, Inc. It has a resolution of 768 x 768 x 198, has a 24 Hz refresh rate, contains an embedded graphics processing system, and uses dithering methods to create images of 3-bit to 21-bit color. The 3-D display system is a visualization p…
We have performed a systematic analysis of the low frequency 1/f-noise in single grain boundary junctions in the colossal magnetoresistance material La_{2/3}Ca_{1/3}MnO_{3-delta}. The grain boundary junctions were formed in epitaxial La_{2/3}Ca_{1/3}MnO_{3-delta} films deposited on SrTiO_3 bicrystal substrates and sho…
LiV_2 O_4 is one of the most puzzling compounds among transition metal oxides because of its heavy fermion like behavior at low temperatures. In this paper we present results for the orbital state and magnetic properties of LiV_2 O_4 obtained from a combination of density functional theory within the local density app…
We compare within an unifying formalism the dynamical properties of modulated and composite aperiodic (incommensurate) crystals. We discuss the concept of inner polarization and we define an inner polarization parameter beta that distinguishes between different acoustic modes of aperiodic crystals. Although this conce…
Completed eukaryotic genomes were screened for medium-chain dehydrogenases/reductases (MDR). In the human genome, 23 MDR forms were found, a number that probably will increase, because the genome is not yet fully interpreted. Partial sequences already indicate that at least three further members exist. Within the MDR…
We develop a quantum theory of the nonlinear interaction between intense surface acoustic waves and electrons of a quantum well in the regime of moving quantum wires and dots. The quantum nonlinear interaction qualitatively differs from the classical one. In a system of electron wires driven by an acoustic wave the so…
Synthetic catalytic scavengers of reactive oxygen species (ROS) may have broad clinical applicability. In previous papers, two salen-manganese complexes, EUK-8 and EUK-134, had superoxide dismutase (SOD) and catalase activities and prevented ROS-associated tissue injury. This study describes two series of salen-mangan…
We examine the local geometry of a simulated glass-forming polymer melt. Using the Voronoi construction, we find that the distributions of Voronoi volume P(v(V)) and asphericity P(a) appear to be universal properties of dense liquids, supporting the use of packing approaches to understand liquid properties. We also ca…
Abstract Polylactide (PLA)/clay nanocomposites loaded with 3 wt % organomodified montmorillonite and PLA/clay microcomposites containing 3 wt % sodium montmorillonite were prepared by melt blending. We investigated the morphology and thermal properties of the nanocomposites and microcomposites and compared them with u…
Electrospinning for the formation of nanoscale diameter fibers has been explored for high-performance filters and biomaterial scaffolds for vascular grafts or wound dressings. Fibers with nanoscale diameters provide benefits due to high surface area. In the present study we explore electrospinning for protein-based bi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOrdered Mesoporous and Microporous Molecular Sieves Functionalized with Transition Metal Complexes as Catalysts for Selective Organic TransformationsDirk E. De Vos, Mieke Dams, Bert F. Sels, and Pierre A. JacobsView Author Information Center for Surface Chemistry & Catalysis…