Materials Literature
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We report a new approach for fabricating layer-by-layer (LBL) structured ultrathin hybrid films on electrospun nanofibres. Oppositely charged anatase TiO 2 nanoparticles and poly(acrylic acid) (PAA) were alternately deposited on the surface of negatively charged cellulose acetate (CA) nanofibres using the electrostati…
Rare earth phosphates have recently been investigated as a potential ceramic material in view of their high-temperature phase stability, high melting point, low thermal conductivity, optical, fluorescence, and catalytic properties, and layered structural features. The present work describes a method for synthesizing n…
Amidopyridine and -2,2'-bipyridine derivatives of EDT-TTF and BTM-TTF (EDT=ethylenedithio, BTM=bis(thiomethyl), TTF=tetrathiafulvalene) have been synthesized and crystallographically characterized. In the solid state, the different supramolecular organization of all these donors results from the competition between th…
The electronic states of manganese in p-type GaN are investigated using photoluminescence (PL) and photoluminescence excitation (PLE) spectroscopies. A series of sharp PL lines at 1.0 eV is observed in codoped GaN and attributed to the intra d-shell transition 4T2(F)-4T1(F) of Mn4+ ions. PLE spectrum of the Mn4+ [4T2(…
It is shown that the average diameter of tracks produced by swift heavy ions in metals is determined by the size of elementary resonator. The last is introduced in the theory of thermal radiation accounting for the stimulated radiation processes. Due to the inverse density gradient, radiation produced by electronic ex…
This contribution considers recent developments in the computer modelling of amorphous polymeric materials. Progress in our capabilities to build models for the computer simulation of polymers from the detailed atomistic scale up to coarse-grained mesoscopic models, together with the ever-improving performance of comp…
We have investigated the hydrogen storage properties of a ball-milled mixture of 3Mg(NH 2 ) 2 and 8LiH after first synthesizing Mg(NH 2 ) 2 by ball milling MgH 2 under an atmosphere of NH 3 gas at room temperature. The thermal desorption mass spectra of the mixture without any catalysts indicated that a large amount o…
<div class="htmlview paragraph">To ensure overall optimisation of heavy duty engine performance (with the respect of NOx&amp;PM future European and US emissions standards), the use of a high efficiency NOx after-treatment system such as a NOx trap appears to be necessary. But running in rich conditions, even…
The substrate-induced oxidation upon prolonged annealing in UHV of ultrathin films of Ni and Cr vapor deposited on yttria-stabilized zirconia YSZ(100) was studied by X-ray photoelectron spectroscopy (XPS) to obtain information about the oxidation mechanism, determine the available quantity of reactive oxygen in YSZ, a…
The isothermal decomposition of austenite into ferrite is investigated using a two-dimensional cellular automaton (CA) algorithm. This CA model provides a simple solution for the difficult moving boundary problem that governs the ferrite grain growth. In this model, the growth of ferrite grains is controlled by both t…
The domain structures of Bi 4− x La x Ti 3 O 12 (BLT) ceramics (where x = 0, 0.5, 0.75, and 1.0) have been investigated by transmission electron microscopy. The morphology of the 90° domain walls were found to be curved due to a decrease of the spontaneous strain energy after doping with La. Movement of the 90° domain…
Cd1-xMnxS quantum dots (QDs) with diameter d less than or equal to 4.5 nm and with manganese concentrations from x = 0.001 to 0.15 have been prepared using aqueous solution precipitation. Absorption and fluorescence spectra at room temperature have been recorded. No monotonic variation of the band gap energy with incr…
Experiment unambiguously shows substitutional nickel is present in as-grown synthetic diamond where Ni is present in the solvent–catalyst. There is less convincing evidence for the presence of an interstitial species. We present the results of first-principles calculations of the properties of substitutional and inter…
<div class="htmlview paragraph">Impact of oil-derived ash on the pressure drop of continuous regeneration-type diesel particulate filter (CR-DPF) was investigated through 600hrs running test at maximum power point on a 6.9L diesel engine, which meets the Japanese long-term emission regulations enacted in 1998, u…
We report on experimental studies of the phase state and the character of phase transitions in the quasi-one-dimensional organic compound $(\mathrm{TMTSF}{)}_{2}{\mathrm{PF}}_{6}$ in the close vicinity of the borders between the metal (M), antiferromagnetic (AF) insulator, and superconducting (SC) states. In order to…
Abstract The divergent dendronization of an ϵ‐caprolactone‐based polymer has been performed to provide access to dendronized polymers with sufficient biocompatibility and degradability for use as drug‐delivery scaffolds. The synthesis was performed through the tin(II) 2‐ethylhexanoate‐catalyzed polymerization of a γ‐f…
The wet air regeneration of some 4-chloro-2-methylphenoxyacetic acid (MCPA) exhausted activated carbons (ACs) has been investigated. The wet oxidation process of MCPA in the absence of ACs suggests the development of a a radical mechanism. Oxygen partial pressure has been shown not to affect the process, while pH exer…
Abstract As an experimental necessity, past flame spread studies have relied on fast burning cellulosic papers. For the longer duration tests planned for the International Space Station a 50% fiberglass, 50% cotton composite fabric is better suited for the novel fuel feeding system in the compact hardware design of a…
Part I of this article describes a series of tests of localized, penetrating impact on sandwich panels. The sandwich panel size was 500 500 mm 2 with a thickness of 46 mm. Three types of panel configuration were tested. Penetration was carried out in quasi-static conditions and at approximately 70 and 93 m/s. Impactor…
Diblock copolymers containing recognition units designed to participate in specific three-point hydrogen bonding were adsorbed onto modified gold surfaces. Self-assembled monolayers (SAMs) containing complementary recognition units were used to direct the adsorption process. The polymer-modified surfaces obtained were…