Materials Literature
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Abstract Blending colored fibers consists of combing fibers together many times in order to obtain a homogeneous color by intimate mixing. If a reflectance curve is to be reproduced, the required proportions of colored fibers are evaluated by trial and error. Two formulas have been introduced to model such a means of…
Abstract Miscibility, melting, and crystallization behaviors of solution‐blended poly(trimethylene terephthalate) (PTT)/poly(ether imide) (PEI) blends have been investigated using thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), and polarized light microscopy (PLM). These blends show a single…
Zinc-blende (\ensuremath{\alpha}-) and NiAs-type (\ensuremath{\beta}-) MnAs are investigated with a combined first-principles linearized argumented plane wave and ${\mathrm{DMol}}^{3}$ study within both the local density approximation (LDA) and the generalized gradient approximation (GGA). First-principles calculation…
Abstract Semi‐interpenetrating polymer networks (SIPNs) consisting of polycaprolactone (PCL) and poly(ethyleneglycol) (PEG) macromer was prepared to improve tensile property in developing biodegradable sutures. When the PEG macromer formed SIPNs with PCL, biodegradability, mechanical strength, and hydrophilicity were…
The histidine biosynthetic pathway is an ancient one found in bacteria, archaebacteria, fungi, and plants that converts 5-phosphoribosyl 1-pyrophosphate to l-histidine in 10 enzymatic reactions. This pathway provided a paradigm for the operon, transcriptional regulation of gene expression, and feedback inhibition of a…
The magnetic circular dichroism (MCD) of core-level absorption [x-ray absorption spectroscopy (XAS)] spectra in the soft x-ray region has been measured for the ferromagnetic Heusler alloys ${\mathrm{Co}}_{2}\mathrm{TiSn},$ ${\mathrm{Co}}_{2}\mathrm{ZrSn},$ and ${\mathrm{Co}}_{2}\mathrm{NbSn}.$ The many-peak structures…
Abstract Bacterial polyesters have shown potential as biodegradable plastics. Microorganisms capable of producing these polyesters from cheaper carbon sources and methods for their efficient recovery are widely studied worldwide. Methylobacterium sp V49, an environmental isolate, was cultivated on a mineral salts medi…
Eight new quaternary selenides CsSmZnSe(3), CsTbZnSe(3), CsDyZnSe(3), CsHoZnSe(3,) CsErZnSe(3), CsTmZnSe(3), CsYbZnSe(3), and CsYZnSe(3) have been synthesized with the use of high-temperature solid-state experimental methods. These compounds are isostructural with KZrCuS(3), crystallizing with four formula units in th…
Abstract Silane treatment has been applied to the preparation of nylon 6/nano‐SiO 2 composites through in situ polymerization. The influence of such treatment on the reactivity of silica, polymerization of nylon 6, and the mechanical properties of the achieved composites has been studied. Fourier transform infrared (F…
Highly porous (∼ 90%), high-surface area (∼1000 m 2 /g), thermally stable (1200 K) crystalline films of MgO are synthesized using a novel reactive ballistic deposition technique. The film consists of a tilted array of porous nanoscale crystalline filaments. Surprisingly, the individual filaments exhibit a high degree…
Abstract The epoxy resin/curing agent/montmorillonite nanocomposite was prepared by a casting and curing process. The intercalation and exfoliation behaviors of epoxy resin in the presence of organophilic montmorillonite were investigated by X‐ray diffraction (XRD) and dynamic mechanical thermal analysis (DMTA). For t…
Silica powder containing organized pores was prepared by a spray drying method. Silica and polystyrene latex (PSL) nanoparticles colloids were mixed and atomized to form micrometer-sized droplets. Nitrogen carrier gas was used to carry the resulting droplets into a vertical reactor that contained two heating zones: 20…
Oxygen non-stoichiometry, structural properties, and phase relations in Ca and Sr substituted LaMnO3 ± δ were studied by means of thermal analysis, X-ray diffraction, and iodometric titration. Hexagonal α-SrMnO3 − δ and LaMnO3 ± δ perovskite are only partly miscible. Room temperature metastable La1 − xSrxMnO3 ± δ soli…
The use of neutral surfactants to form a thermally stable ordered mesoporous ceria phase is reported. The judicious choice of cerium acetate as the inorganic framework precursor and the inorganic to surfactant ratio in the preparation mixture allowed the condensation of acetate derived inorganic polymer chains about t…
We investigate the structure and phase behavior of a two-component (binary) polymer brush in a solvent within self-consistent field theory as a function of the chains' stretching, the composition, and the incompatibility. Grafting the chains irreversibly prevents macrophase separation and the chains assemble into thre…
The dependence of electronic states on the length and diameter of CdSe quantum rods is investigated using semiempirical pseudopotential calculations. Energy levels cross as the aspect ratio increases due to their different dependence on length. The crossover between the highest occupied levels leads to a transition fr…
Several inorganic−organic hybrid complexes were synthesized from a synthetic clay (Sumecton SA) and cationic porphyrins (+4 charge). In the clay−porphyrin complexes, the λ max values of the Soret bands of the porphyrins were shifted to longer wavelengths compared to those in water. Two types of complexes were formed d…
The title compounds were synthesized and studied by solution and single-crystal absorption, luminescence, and excitation spectroscopy. The f-f luminescence is induced in the Tm(3+) and Yb(3+) complexes in solution by exciting into the (1)Pi-(1)Pi absorptions of the ligand in the UV. A single-configurational coordinate…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolid-State Structures of Metalloporphyrin NOx CompoundsGraeme R. A. Wyllie and W. Robert ScheidtView Author Information The Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556 Cite this: Chem. Rev. 2002, 102, 4, 1067–1090Publication…
We present Mn $3s$ x-ray photoelectron spectra of manganese oxides with the Mn formal valency from $2+$ to $4+.$ We found that the ${\mathrm{Sr}}^{2+}$ doping or cation deficiency in manganites do not change the Mn $3s$ splitting in manganites with the Mn formal valency from $3.0+$ to $3.3+.$ We suggest that doping ho…