Materials Literature
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Abstract A series of shape memory polyurethanes (SPU) with different component ratio of PEG, MDI, BDO, and crosslinker DEA were synthesized by stepwise polymerization in DMF. WAXD, SAXS, DMTA, and DTA were used to study the microphase structure of SPU. No obvious phase‐separation and crystalline evidence of the PEG so…
<div class="htmlview paragraph">The pressure drop behavior of catalytic converters has been investigated for a number of different substrates, suitable for high performance IC-engines, regarding cell density, wall thickness and coating.</div> <div class="htmlview paragraph">The measurements have been…
<div class="htmlview paragraph">The ultimate goal in the numerical simulation of automotive catalytic converters is the prediction of exhaust gas emissions as function of time for varying inlet conditions, i.e. the simulation of a driving cycle. Such a simulation must include the calculation of the transient thr…
We present a comprehensive analysis of the Dzyaloshinsky-Moriya interaction and crystal-field parameters using the angular dependence of the paramagnetic-resonance shift and linewidth in single crystals of ${\mathrm{La}}_{0.95}{\mathrm{Sr}}_{0.05}{\mathrm{MnO}}_{3}$ within the orthorhombic Jahn-Teller distorted phase.…
Fluorenic core oligomers, displaying interesting photoluminescence properties, have been synthesized by an organometallic route. The crystal and molecular structure of a fluorene derivative and three homologous oligomers have been studied. The spiro-derivative of dibromofluorene shows a very strong interaction between…
<div class="htmlview paragraph">DPFs (Diesel Particulate Filters) have been a primary technology utilized to purify diesel PM emissions. One of the major challenges of the DPF is to reduce pressure drop caused by PM and ash accumulation.</div> <div class="htmlview paragraph">This paper reports on the…
Pairing symmetry in $\ensuremath{\kappa}\ensuremath{-}(\mathrm{BEDT}\ensuremath{-}\mathrm{TTF}{)}_{2}X$ is reexamined by applying the fluctuation exchange method to the Hubbard model on the original four-band lattice. Our study is motivated by the discrepancy between recent thermal conductivity/tunneling spectroscopy…
<div class="htmlview paragraph">A new after-treatment system called DPNR (Diesel Particulate-NOx Reduction System) has been developed for simultaneous and continuous reduction of particulate matter (PM) and nitrogen oxides (NOx) in diesel exhaust gas. This system consists of both a new catalytic technology and a…
Nanobamboos have been created by chemical vapor deposition of boron nitride (BN). Strands of nanobamboos (see Figure), nanotubes, or nanocables are formed depending on the oxygen content of the precursor material. An insufficent supply of boron oxide leads to capped (bell) structures, which form in order to minimize t…
<div class="htmlview paragraph">This paper discusses the choice of catalyst types to reduce the NOx emissions down to the Euro V level. A novel Urea injection system is also presented, which is based on a mass produced digital dosing pump that is combined with an electronic control unit specially developed for c…
The solid oxide fuel cell (SOFC) system has emerged as an important technology for automotive and stationary applications. Modeling and simulation of the SOFC system have been utilized as an integral tool in an accelerated joint SOFC system development program. Development of unique modeling approaches and their resul…
<div class="htmlview paragraph">The paper covers reported developments from all major conferences in the year 2001 that occurred in the US and Europe and gives a comprehensive overview of the current state-of-the-art in diesel emission control.</div> <div class="htmlview paragraph">The latest develop…
Carbon nanocoils with a coil diameter of 50–450 nm were prepared by the catalytic pyrolysis of acetylene, and the preparation conditions and morphology were examined. To clarify the growth mechanism, the carbon nanocoils were also heat treated at 2500 °C for 8 h in a N2 atmosphere, then partially oxidized in air at 60…
We present a combined density functional theory and EXAFS investigation into the geometry and coordination of the oxygen-donating species in surface grafted, tert-butyl hydroperoxide (TBHP) exposed Ti↑MCM-41 oxidation catalysts. The formation of a number of different Ti(η2-peroxo) and Ti(η1-peroxo) type species, inclu…
We report that low-intensity light can dramatically influence and regulate the nanoparticle self-assembly process: Illumination of a substrate exposed to a beam of gallium atoms results in the formation of gallium nanoparticles with a relatively narrow size distribution. Very low light intensities, below the threshold…
The pressure-induced insulator-metal transition in amorphous ${\mathrm{GeSe}}_{2}$ $(a\ensuremath{-}{\mathrm{GeSe}}_{2})$ is studied using an ab initio constant pressure molecular-dynamic simulation. $a\ensuremath{-}{\mathrm{GeSe}}_{2}$ transforms gradually to an amorphous metallic state under the application of press…
The glass-forming ability, thermal stability, and magnetic properties have been investigated for an Fe67Co9.4Nd3.1Dy0.5B20 glassy alloy with a large supercooled liquid of 48 K before crystallization prepared by copper mold casting. The glassy phase is formed in a rod form with a diameter of 0.5 mm. The crystallized na…
The layered trirutile phases HMWO6 (M = Nb, Ta) and the layered perovskite H2W2O7 (synthesized by acid leaching of Bi2W2O9) were exfoliated into nanoscale colloids by reaction with quaternary ammonium hydroxides.
The development of self-assembled magnetic CoFe2O4 nanoparticles within polymer matrices at room temperature is reported. Diblock copolymers consisting of poly (norbornene) and poly (norbornene-dicarboxcylic acid) (NOR/NORCOOH) were synthesized. The self-assembly of the mixed metal oxide within the NORCOOH block was a…
Abstract A series of new shape memory polymers are synthesized by the cationic copolymerization of regular soybean oil, low saturation soybean oil (LoSatSoy oil), and/or conjugated LoSatSoy oil with styrene and divinylbenzene, norbornadiene, or dicyclopentadiene initiated by boron trifluoride diethyl etherate or relat…