Materials Literature
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Large-particle (15 and 40 μm) Co−MCM-41 was synthesized using a pseudomorphic transformation. To maintain the spherical shape of the parent silica particles, overcondensation of silanol groups has to be avoided under a moderately basic synthesis condition. After 4 days of autoclaving at 100 °C with the Co−MCM-41 synth…
Insertion of iron(II) into methylated derivatives of N-confused porphyrins 2-aza-2-methyl-5,10,15,20-tetraphenyl-21-carbaporphyrin (MeCTPPH)H, 2-aza-5,10,15,20-tetraphenyl-21-methyl-21-carbaporphyrin (CTPPMe)H2, and 2-aza-2-methyl-5,10,15,20-tetraphenyl-21-methyl-21-carbaporphyrin (MeCTPPMe)H yielded N- or C-methylate…
We characterize the kinematics of bubbles in a sheared two-dimensional foam using statistical measures. We consider the distributions of both bubble velocities and displacements. The results are discussed in the context of the expected behavior for a thermal system and simulations of the bubble model. There is general…
The ground state of a double-exchange model for orbitally degenerate e(g) electrons with Jahn-Teller lattice coupling and weak disorder is found to be spatially inhomogeneous near half filling. Using a real-space Monte Carlo method we show that doping the half-filled orbitally ordered insulator leads to the appearance…
Pyrolysis of phenethyl phenyl ether confined in mesoporous silicas by covalent grafting results in significantly increased product selectivity compared with fluid phases.
The thermal decomposition of poly(beta,l-malic acid), poly(alpha-methyl beta,l-malate), and ionic complexes of the polyacid with alkyltrimethylammonium salts was studied by TGA, GPC, and FTIR and NMR spectroscopy. It was found that poly(beta,l-malic acid) depolymerized above 200 degrees C by an unzipping mechanism wit…
This paper describes the use of surface plasmon resonance (SPR) spectroscopy and self-assembled monolayers (SAMs) to understand the characteristics of surfaces that promote the adsorption of proteins at high ionic strengths (high-salt conditions). We synthesized SAMs presenting different multimodal ligands and determi…
Abstract Dynamic rheology, differential scanning calorimetry and in situ Fourier transform infrared spectroscopy were used to study the cure behavior of unsaturated polyester/modified montmorillonite nanocomposites. The results showed that their gel times increased markedly at the same cure temperature, and that the a…
Abstract The processing of forest products into pulp, paper, paperboard, and other wood products results in the generation of volatile organic compounds (VOCs) and hazardous air pollutants (HAPs). This work focused on the development of a photocatalytic packed‐bed reactor for the oxidation of methanol, which is the pr…
Alkoxides are the most common precursors used for the production of alumina nanopowders. These materials are, however, expensive and corrosive. This paper introduces a new method for the production of alumina nanopowders by rapid cooling of a synthetic caustic sodium aluminate solution (Bayer liquor), followed by calc…
Symmetric hierarchical hollow PbS structures consisting of nanowalls were successfully fabricated by a facile solvothermal process in ethylenediamine at 120 degrees C for 12 h, employing lead acetate trihydrate and dithizone as precursors; the thickness of the nanowalls is about 80 nm. No surfactants or other template…
Two monomers with preformed Schiff base and arylenevinylene structure and final bromine substituents were synthesized by coupling of 3-formyl-6-bromo-N-hexyl-carbazole with 1,4-phenylenediamine and tetraethyl-p-xylylene diphosphonate, respectively. These compounds were used to synthesize arylenimine and arylenevinylen…
The haemocytes of the Indian edible oyster Crassostrea madrasensis were characterized using light and electron microscopy. The light microscopic study was conducted by staining a monolayer of the haemocytes with Geimsa. Cells without granules and with a large nucleus occupying much of the cytoplasmic area were grouped…
The frequency‐dependent microwave complex permittivity of composites based on an Al 2 O 3 –CuO system is investigated at room temperature. The composites are formed by solution infusion of copper precursors into a porous Al 2 O 3 matrix, followed by thermal decomposition to copper oxides and localized formation of cop…
Natürlicher Helfer: PbE-Nanoröhren (E=S, Se, Te; siehe Bild) wurden mit einer neuartigen Biomolekül-unterstützten Methode bei Raumtemperatur erhalten. Die als Vorstufen fungierenden Nanodrähte, die sich aus in Gegenwart von Cystein synthetisierten Nanokristallen selbstorganisierten, spielen eine entscheidende Rolle al…
Calcium zirconate (CaZrO 3 , CZ) was prepared using a solid‐state reaction with mechanochemical activation through vibro‐milling, aiming at completing the reaction CaO+ZrO 2 =CaZrO 3 at relatively low calcination temperatures. Changes in the crystallite size and homogeneity of the mixed components CaO and ZrO 2 in the…
It has recently been hypothesized that transient bimodal grain size distributions can arise from unimodal distributions during coarsening if the continued growth of a majority fraction of the crystals is arrested by the energy barrier to nucleate new layers. To test this hypothesis experimentally, SrTiO 3 has been coa…
In this paper the multiwalled carbon nanotubes (MWNTs) were synthesized by a chemical vapour deposition and the SEM graph shows that the sample has good construction. The micro-Raman spectrum shows the characteristic line of the MWNTs and an additional line produced by the defects on the outer surface of MWNTs. The ph…
Family 4 carbohydrate esterases (CEs) catalyse the N- or O-deacetylation of substrates such as acetylated xylan, chitin, and peptidoglycan. CEs are classified into 14 families by sequence homology (see http://afmb.cnrs-mrs.fr/CAZY4). Family 4 is by far the largest of the CE families, with over 1000 open reading frames…
We address the existence and properties of hybrid surface waves forming at interfaces between left-handed materials and dielectric birefringent media. The existence conditions of such waves are found to be highly relaxed in comparison to Dyakonov waves existing in right-handed media. We show that left-handed materials…