Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTBlock Copolymer Microspheres Containing Intricate Nanometer-Sized Segregation PatternsZhihua Lu, Guojun Liu, and Futian LiuView Author Information Department of Chemistry, University of Calgary, 2500 University Dr., NW, Calgary, Alberta, Canada T2N 1N4 Cite this: Macromolecules…
We use atomic-level simulation methods to determine the zero-temperature structure and properties of coherent KNbO3/KTaO3 superlattices. We find that the in-plane behavior is essentially bulk-like with an abrupt jump in the polarization at the interfaces. By contrast, the polarization in the modulation direction is co…
A silicon nitride ceramic with unidirectionally aligned β‐Si 3 N 4 elongated grains (UA‐SN) was fabricated by sintering the extruded Si 3 N 4 green body with a small amount of rodlike β‐Si 3 N 4 seed. The effect of anisotropy in microstructure on tribological properties was investigated, compared with a fine‐grained S…
In electron-beam and photolithography, local heating can change the resist sensitivity and lead to variations in significant critical dimension. Existing models suffer from the lack of experimental data for the thermal properties of the polymer resist films. We present the measurements of both out-of-plane and in-plan…
Abstract Poly( N ‐vinyl‐2‐pyrrolidone) (PVP) was chosen as a protecting polymer for its large protective value among homopolymers. Suspensions of palladium (Pd) nanoparticles were prepared by refluxing solutions of palladium(II) chloride and PVP in methanol. The mean diameter of Pd nanoparticles without adsorbed layer…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTUltrathin, Ion-Selective Polyimide Membranes Prepared from Layered PolyelectrolytesDaniel M. Sullivan and Merlin L. BrueningView Author Information Department of Chemistry Michigan State University East Lansing, Michigan 48824 Cite this: J. Am. Chem. Soc. 2001, 123, 47…
With the aim of gaining insight into the molecular and phylogenetic relationships of isocitrate dehydrogenase (IDH) from hyperthermophiles, we carried out a comparative study of putative IDHs identified in the genomes of the eubacterium Thermotoga maritima and the archaea Aeropyrum pernix and Pyrococcus furiosus. An o…
The synthesis and characterization of the new spin crossover mononuclear complex [FeII(DPEA)(bim)](ClO4)2·0.5 H2O, where DPEA = (2-aminoethyl)bis(2-pyridylmethyl)amine and bim = 2,2-bisimidazole, are reported. Variable-temperature magnetic susceptibility measurements (77−295 K) reveal the occurrence of a two-step spin…
It is found that a nanoicosahedral phase in the diameter less than 20 nm is formed as a primary crystalline phase in the melt-spun Zr70Pd30 and Zr80Pt20 binary amorphous alloys. The nanoicosahedral phase is also formed in the as-quenched state in the Zr80Pt20 binary alloy by controlling the quenching rate. The slight…
Static and earthquake‐simulator testing of two 230‐kV, 3000A, Type‐U transformer bushings manufactured in the mid 1980s by the General Electric (GE) Company was undertaken to evaluate both the seismic performance of bushings known to be vulnerable to damage from moderate earthquake shaking, and the efficacy of simple…
The crystallization of CaCO3 in the presence of monolayer-protected gold nanoparticles is investigated here. It is found that crystals of CaCO3 grow around the gold nanoparticles, which act as nucleation templates, resulting in metal–organic–inorganic hybrid materials (see Figure). Control of the shape (spherical or n…
The two-dimensional (2D) photonic band gap was observed in naturally formed anodic porous alumina. Anodizing of Al under appropriate conditions yielded the anodic porous alumina which had an ordered air-hole array with a multidomain triangular lattice. The transmission spectra of the multidomain triangular air-hole la…
Abstract The microtubules of polyaniline (PANI) with room temperature conductivity of 3.5–2.6 S/cm were synthesized by a template‐free method. The structural characterizations by UV‐vis and FT‐IR spectra as well as X‐ray diffraction showed that the polymer chain of the resulting microtubules was identical to the PANI…
An immobilized Ru(meso-tetraarylporphyrin) complex was shown to be a very efficient catalyst for the epoxidation of olefins. In the presence of HBr, alcohols and even alkanes could be converted to the corresponding ketones. For the latter reactions the polymeric catalyst displayed a significantly enhanced activity whe…
The apparent change in activation energy describing the parabolic rate constant for the passive oxidation of SiC is examined. New data are combined with reevaluated previous results to determine the influences of crystallinity, impurity contamination, and multiple flux mechanisms. The results suggest that the high‐tem…
Application of imprinting of vacuum-evaporated Al on a Si substrate using an SiC mold with an ordered array of hexagonally arranged convexes and subsequent anodization yielded an ideally ordered porous alumina mask on the substrate. The obtained alumina mask has sufficient adhesion to a Si substrate, and was used as a…
Luminescent core−shell particles were prepared by the layer-by-layer deposition of polystyrenesulfonate (PSS) and water-soluble ionene precursor polymers containing fluorene units (PI) onto spherical colloidal particles. Subsequent cross-linking of the PI in the multilayer shell formed the luminescent conjugated oligo…
The biosynthetic pathway for the synthesis of the compatible solute alpha-mannosylglycerate in the hyperthermophilic archaeon Pyrococcus horikoshii is proposed based on the activities of purified recombinant mannosyl-3-phosphoglycerate (MPG) synthase and mannosyl-3-phosphoglycerate phosphatase. The former activity was…
Chiral polyesters, end-capped with terpyridine, were prepared via the coordinative ring-opening polymerization of L-lactide. Stable supramolecular dimer structures resulted after complexation with iron(II) ions. The formation of both the macroligands and the polymer complexes was proven for the first time clearly by m…
Abstract A systematic procedure is developed for designing an integrated crystallization system by considering the interaction between crystallization and downstream processing. Potential problems related to unit operations such as filtration, washing, dewatering, recrystallization, and drying are anticipated and reso…