Materials Literature
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This study focuses on the complexes formed between polystyrene- block -poly( N -ethyl-4-vinylpyridinium bromide) (PS- b -PEVP) and poly(sodium methacrylate) (PMANa). These complexes were synthesized as follows. First, PS- b -PEVP is dispersed in water, which results in the formation of the micelles with insoluble PS c…
A series of copper-based catalysts supported on zeolite-Y were prepared through a coprecipitation impregnation method and used for the synthesis of dimethyl ether (DME) directly from synthesis gas (syngas) in a fixed-bed reactor. The conversion of CO and the selectivity of DME increased from 7.7% and 5.9% on Cu/zeolit…
Calcite crystals nucleate on the (01.2) face on a diverse range of organic substrates, including self-assembled monolayers, hydrogen-bonded ribbons, and polymer rafts. The (01.2) face of calcite is a polar surface. Therefore macroscopic crystal growth can only occur if the dipole moment is quenched. We demonstrate tha…
Pendant drop experimental results are presented for the temperature dependence of the interfacial tension between water and the immiscible nematic liquid crystal 4'-pentyl-4-biphenylcarbonitrile (5CB) in the presence of the adsorbed surfactant cetyltrimethylammonium bromide (CTAB). Adsorption of the surfactant lowers…
Abstract The stress relaxation behavior of natural rubber (NR) and its composites reinforced with short coir fibers under tension was analyzed. The rate of stress relaxation was a measure of the increase in the entropy of the compounds: the higher the rate was, the greater the entropy was. At lower strain levels, the…
This paper deals with the incorporation of a vector hysteresis model in 2D finite-element (FE) magnetic field calculations. A previously proposed vector extension of the well-known scalar Jiles-Atherton model is considered. The vectorised hysteresis model is shown to have the same advantages as the scalar one: a limit…
Pyrrole (C 4 H 5 N) was embedded in low-temperature solid inert matrixes (argon, xenon; T = 9 K) and both the monomer and low-order aggregates characterized by FTIR spectroscopy. The spectroscopic studies were complemented by extensive theoretical [DFT(B3LYP)/6-311++G(d,p)] structural and vibrational studies carried o…
Abstract The thermal behavior of vinyl ester resin matrix composites reinforced with jute fibers treated for 2, 4, 6, and 8 h with 5% NaOH was studied with Thermo‐gravimetric analysis and differential scanning calorimetry. The moisture desorption peak shifted to a higher temperature, from 37 to 58.3°C, for all the tre…
Exopolymers (EPS) are exuded by single-celled and multicellular organisms. They consist mainly of carbohydrates that hydrate on contact with water and EPS are absorbent and often thixotropic. These properties result in a large number of uses: for attachments, as an aid to flotation, in locomotion, in feeding, for buil…
Abstract Nano‐Mg(OH) 2 was synthesized with an in situ deposition technique, and its size was confirmed by X‐ray diffraction. A polypropylene–Mg(OH) 2 composite was prepared by melt‐extrusion processing. The addition of a small quantity of a nanofiller (up to 10 wt %) increased Young's modulus up to 433% with respect…
Living organisms can control the size, shape, and structure of minerals. Attempts to reproduce this biological control in the laboratory often use Langmuir monolayers of long-chain carboxylic acids. We use large-scale molecular dynamics simulations to calculate the interfacial energies of calcite crystals grown on ste…
We have performed large-scale molecular dynamics simulations of the polymerization of silicic acid in aqueous solution using the potential developed by Fueston and Garofalini [ J. Phys. Chem. 1990, 94, 5351]. Seventeen simulations, with different water-to-silicon ratios and silicic acid concentrations, were each run f…
The kinetics for the catalytic combustion of methane on Pd in its metal and oxide forms was measured on a foil and on large single crystals exposing initially the (111), (100), and (110) planes. The rates, reaction orders, and activation energies were not dependent on the structure of the active phase. Turnover rates…
Abstract New monoalkyl‐substituted lactides were synthesized by reaction of α‐hydroxy acids with 2‐bromopropionyl bromide, and polymerized with various catalysts in the presence of benzyl alcohol by ring‐opening polymerization (ROP). The classic tin(II) 2‐ethylhexanoate (Sn(Oct) 2 ) catalyst was leading to polymers wi…
Photoluminescence (PL) and photoluminescence excitation (PLE) spectroscopy of pillar-suspended single-walled carbon nanotubes has been measured for temperatures between 300 and $5\phantom{\rule{0.3em}{0ex}}\mathrm{K}$. The atmospheric environment strongly affects the low-temperature luminescence. The PL intensity is q…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOrganic Conductors with Unusual Band FillingsTakehiko MoriView Author Information Department of Organic and Polymeric Materials, Tokyo Institute of Technology, O-okayama 2-12-1, Meguro-ku, Tokyo 152-8552, Japan Cite this: Chem. Rev. 2004, 104, 11, 4947–4970Publication Date (…
We have developed the first computer program for determining the coordinates of heterojunctions between two arbitrary carbon nanotubes. This software implements the topological algebra based on the concept of strip, a continuous subset of carbon rings containing all the topological defects (nonhexagonal carbon rings).…
We present new interatomic potentials with which to model the structures and stabilities of the zinc-blende $(\mathrm{ZB})$ and wurtzite $(\mathrm{W})$ polytypes of $\mathrm{ZnS}$ and $\mathrm{CdS}$. The potentials are able to reproduce many of the properties of all four minerals to within a few percent of the experim…
A thermal method for converting Au colloids into atomic Au clusters and subsequent growth of Au nanocubes from clusters is reported. Mass spectral analysis shows that these clusters are Au trimers. The Au clusters show distinct optical absorption at 305 and 250 nm and have extraordinary stability under ambient conditi…
We have investigated the energy transfer processes in DNA sequence detection by using cationic conjugated polymers and peptide nucleic acid (PNA) probes with ultrafast pump-dump-emission spectroscopy. Pump-dump-emission spectroscopy provides femtosecond temporal resolution and high sensitivity and avoids interference…