Materials Literature
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Thin films containing nanometer-sized PrAlO 3 or NdAlO 3 crystals evenly dispersed in an amorphous Al 2 O 3 matrix were grown by chemical vapor deposition (CVD) of heterometal alkoxides, [Ln{Al(O Pr i ) 4 } 3 ( Pr i OH)] (Ln = Pr ( 1 ), Nd ( 2 )). The lanthanoid to aluminum ratio in the precursors, established by sing…
Silanization of glass surfaces by (3-glycidoxypropyl)trimethoxysilane (GPS) provided a surface-coupled layer of functional molecules for the subsequent reaction with aniline (An). The so-modified glass surface (the An−GPS−glass surface) was then subjected to oxidative graft polymerization of aniline. The composition a…
We describe the first structure determination of a type II citrate synthase, an enzyme uniquely found in Gram-negative bacteria. Such enzymes are hexameric and are strongly and specifically inhibited by NADH through an allosteric mechanism. This is in contrast to the widespread dimeric type I citrate synthases found i…
The thermoresponsive and pH-responsive intelligent copolymers of N -vinylformamide (NVF) and N -vinylisobutyramide (NVIBA), and their derivatives with primary amino groups, were synthesized. Hydrolysis of poly(NVF), poly(NVIBA), and poly(NVF- co -NVIBA) to obtain poly(vinylamine) [poly(VAm)] was carried out under acid…
Photoreactive decatungstates Na 4 W 10 O 32 and (nBu 4 N) 4 W 10 O 32 were heterogenized inside the silica network via a sol−gel technique, resulting in the Na 4 W 10 O 32 /SiO 2 (Na 1 ) and (nBu 4 N) 4 W 10 O 32 /SiO 2 (Q 1 ) composites. The physicochemical properties of as-synthesized composites were measured by UV…
Polyaniline base and polyaniline hydrobromide were reacted with bromine in aqueous medium. The content of bromine in the modified polymer increased with the amount of bromine introduced into the reaction mixture. The enhanced conductivity of polyaniline base after reaction with bromine was explained by the protonation…
The incorporation of cyclodextrin (CD) groups inside mesoporous silica frameworks was attempted using two methods: by the grafting of the CD groups into the channels of preformed mesoporous silica hosts and by the direct synthesis of CD-containing mesoporous materials by a one-step process. While the grafting procedur…
Due to phase separation in the silicate melt, the synthesis of fluorosmectites ([Na 0.5 ] inter [Mg 2.5 Li 0.5 ] oct [Si 4 ] tet O 10 F 2 ) from the melt without mechanical mixing yields an inhomogeneous material. Because of the solid solution capability of the 2:1 layer silicate structure, the nonuniformity in chemic…
Hard-particle packings have served as useful starting points to study the structure of diverse systems such as liquids, living cells, granular media, glasses, and amorphous solids. Howard Reiss has played a major role in helping to illuminate our understanding of hard-particle systems, which still offer scientists man…
[reaction--see text] For the gold-catalyzed phenol synthesis an intramolecular migration of the oxygen atom was proven. Several other late transition metals with d(8) configuration allow this conversion, providing evidence for Au(III) being a catalytically active species. On the other hand gold was still the most acti…
The two title trialkaline trioxoantimonates(III), tripotassium trioxoantimonate(III), K(3)[SbO(3)], (I), and tricaesium trioxoantimonate(III), Cs(3)[SbO(3)], (II), crystallize in the cubic Na(3)[AsS(3)] structure type in space group P2(1)3. The structures show discrete Psi-tetrahedral [SbO(3)](3-) anions with C(3v) po…
In the glass industry, the lifetime of many metallic parts in contact with molten glass is controlled mainly by high temperature corrosion which, as for aqueous solutions is governed by oxidation-reduction reactions: reduction of glass components counterbalances the oxidation of metallic components. Depending on the g…
We present the results of a series of model Monte Carlo calculations of the scattering of spin-polarized electrons from gold foil targets. Our calculations examine the behavior of the left-right scattering asymmetry A as a function of various parameters conventionally used in extrapolation of the left-right asymmetry…
An adhesive bonding process is presented that utilizes sub-micrometer thick bondlines of all-aromatic thermosetting copolyesters (ATSP) for the assembly of polyimide membranes in silicon-based sensors and actuators. Due to the unique ability of ATSP to form void-free self-adhesive bonds through solid-state interchain…
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Low-dimensional iron chalcogenide Fe 7 S 8 and FeSe 2 microcrystals and FeTe 2 bulk single crystals were synthesized via the reactions of FeCl 3 with S or Se or Te powders in hydrazine hydrate solution (85%, v/v) at 140 °C for 36 h. The products were characterized by means of X-ray powder diffraction, rocking curve, t…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTInteractions in Miscible Blends of Poly(styrene-co-methacrylic acid) with Copolymers Containing Vinylpyrrolidone and Vinylpyridine GroupsHeidi R. Motzer, Paul C. Painter, and Michael M. ColemanView Author Information Department of Materials Science and Engineering, Pennsylvania…
The oxidation of SiC-fiber-reinforced SiC composites at high temperature (1200°C) and elevated total water vapor pressures (up to 1.5 atm) was studied. Substantial degradation of SiC composites was observed under these exposure conditions, particularly when BN (used as a fiber coating) was a composite constituent. Bes…
ADVERTISEMENT RETURN TO ISSUEPREVNoteSynthesis of Amphiphilic Poly(ε-caprolactone) Macromonomers by Lipase CatalysisArmando CórdovaView Author Information STFI, Swedish Pulp and Paper Research Institute, P.O. Box 5604, SE−114 86 Stockholm, Sweden Cite this: Biomacromolecules 2001, 2, 4, 1347–1351Publication Date (Web)…
This study aims to precise and to quantify the link between the development of the metal/oxide roughness, the localization of cracks in the oxide layer, and the transition in Zircaloy-4 and Zr-1Nb-O corrosion kinetics. The morphological characteristics of oxide scales formed in autoclave and thermobalance at 415°C wer…