Materials Literature
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An intergranular layer was found in 0.4 mol% Y-doped BaTiO3, which was sintered below the eutectic temperature in air. The layer possessed a crystal structure similar to Ba6Ti17O40 with a thickness of 0.7 nm. Plate-like second phases of Ba6Ti17O40 were also observed at triple-grain junctions and an orientation relatio…
Abstract Polyaniline (PANI)–organoclay nanocomposites were prepared. Intercalation of aniline monomer into montmorillonite (MMT) modified by polyoxyalkylene was followed by subsequent oxidative polymerization of the aniline in the interlayer spacing. The organoclay was prepared by cation exchange process between sodiu…
The purpose of this study is to provide a quantitative characterization of the thermal behavior of amorphous organic pharmaceutical compounds across their glass transition temperature, and to assess their molecular mobility as a function of temperature and time by combining theoretical simulations with experimental me…
The year 2007 marks the 50th anniversary of Keller's seminal proof that thin polyethylene crystals grown from dilute solution are composed of chain-like molecules that are folded.1 Shortly thereafter it was demonstrated that polymer crystals grown from the melt phase also are plate-like with stems oriented in the thin…
Fluorescence spectroscopy and electron paramagnetic resonance (EPR) provide insights into the nature and dynamics of disulfide binding to the surface of CdSe quantum dots. We show evidence that adsorption occurs slowly but irreversibly, leading to time-dependent quenching efficiency.
Electrochromic properties of spun films of bis[octakis(hexylthio)phthalocyaninato] dysprosium(III) were investigated for determining nicotinamide adenine dinucleotide hydride (NADH) in water solutions. A spin-coated film deposited on indium tin oxide electrode displays only one redox couple (at E1/2=0.78V). The films…
X-ray photoelectron spectroscopy (XPS) and atomic force microscopy have been used to study Co nanoparticles evaporated onto freshly cleaved highly oriented pyrolytic graphite (HOPG) surfaces. XPS chemical characterization employed symmetrical line shapes and was carried out as functions of the amount of Co deposited a…
La 0.5 Ba 0.5 MnO 3 products with novel flowerlike, microcube, and nanocube structures were successfully synthesized by a simple hydrothermal route by controlling the alkalinity of the reaction solutions. The synthesized products were systematically studied by X-ray powder diffraction, field-emission scanning electron…
The kinetics of propylene oxidation to propylene oxide (PO) with H 2 /O 2 mixtures on gold supported on the mesoporous titanium silicate, Ti-TUD, was investigated using Langmuir−Hinshelwood (L−H) models and power−rate law (PRL) models. The catalyst gave stable activity and was appropriate for the kinetic studies, givi…
O estudo químico das cascas das raízes de Spathodea campanulata (Bignoniaceae) conduziu ao isolamento de um irióide glicosilado (ajugol) e dois derivados fenólicos (ácido p -hidroxi-benzóico e p -hidroxi-benzoato de metila). Os compostos foram identificados com base na interpretação dos seus dados espectrais. A ativid…
Density functional theory has been used to analyse the interaction between sulfuric acid and graphene. Four different coverages, ranging from a nearly isolated sulfuric acid molecule (one H2SO4 molecule per 32 C atoms) to a bilayer (one H2SO4 molecule per 4 C atoms) have been studied calculating geometries, binding en…
Surfactant-templated, mesostructured thin films are synthesized such that photoelectron donors and electron acceptors are separated spatially in the different regions of the thin film. A photoelectron donor is placed within the silica framework by using a silylated derivative of the well-known tris(bipyridine)rutheniu…
The excited-state structural dynamics of nickel(II)tetrakis(2,4,6-trimethylphenyl)porphyrin (NiTMP) and nickel(II)tetrakis(tridec-7-yl)porphyrin (NiSWTP) in a toluene solution were investigated via ultrafast transient optical absorption spectroscopy. An ultrashort stimulated emission between 620 and 670 nm from the S1…
Large-scale pyramid-like micropatterns were prepared via capillarity-driven self-assembly during the evaporation of water from aligned carbon nanotubes (ACNTs) wrapped by a polyelectrolyte, poly (sodium 4-styrenesulfonate) (PSS). PSS wrapping results in providing negative charges on every tube, which makes it possible…
Chemically tunable hydrogel microlenses have been developed from acrylamide hydrogels based on covalently bound hinge-motion binding proteins, like calmodulin, and low affinity ligands, i.e. phenothiazine. Initially the protein binds to phenothiazine forming chemical crosslinks within the hydrogel, which are released…
Abstract Tensile characteristics are the most significant mechanical properties for coated woven fabrics as membrane materials used in lightweight constructions. Factors that might affect test results of the material under uni‐ and bi‐axial tensile loads are examined. After series of tensile tests on PVC‐coated membra…
The crystal structures of the perovskites ${R}_{1\ensuremath{-}x}{\mathrm{Sr}}_{x}\mathrm{Co}{\mathrm{O}}_{3}$ ($R=\mathrm{La}$, Pr, and Nd) with $0\ensuremath{\leqslant}x\ensuremath{\leqslant}0.3$ were refined from x-ray powder diffraction spectra with the Rietveld method. The result of the Rietveld analyses indicate…
BACKGROUND: Crystallization is a major bottleneck in the process of macromolecular structure determination by X-ray crystallography. Successful crystallization requires the formation of nuclei and their subsequent growth to crystals of suitable size. Crystal growth generally occurs spontaneously in a supersaturated so…
Cobaltabisdicarbollide-doped polypyrrole (PPy-[Co(C 2 B 9 H 11 ) 2 ]) nanostructures have been produced by directed, potentiostatic electropolymerization using a patterned combination of conducting and insulating thiols (4-aminothiophenol and octadecylmercaptan, respectively). The different conducting characters of bo…
The near-infrared optical properties of single-walled carbon nanotubes (SWNTs) have attracted particular attention for nanobiosensors based on their redox chemistry. In this work, we studied the redox reaction of single-stranded DNA (ssDNA)-encased HiPco nanotubes with hydrogen peroxide. The absorption intensity of th…