Materials Literature
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Abstract A planar anode‐supported solid oxide fuel cell (SOFC) has been tested to investigate gas tightness of the electrolyte and the applied seals. Gas leaks reduce the efficiency of the SOFC and it is thus important to determine and minimise them. Probe gases (He and Ar) and a Quadrupole Mass Spectrometer were used…
Digital image analysis techniques in the spatial and frequency domains for twist measurement of yarns are described. A spatial technique is developed to extract the twist angle through the analysis of the yarn core image. Then, a Fourier transformation technique is applied to yarn images to measure the orientation of…
Abstract Ionic transport in porous anodic alumina (PAA) films during steady‐state growth was simulated, including effects of ionic migration in the electric potential and stress gradients, as well as material flow. The calculated flow patterns display similar characteristics to those revealed by experimental studies.…
We study the wetting by water of complex "hydrophobic-hydrophilic" surfaces made of a hydrophobic substrate covered by a hydrophilic polymer brush. Polystyrene (PS) substrates covered with polystyrene- block-poly(acrylic acid) PS- b-PAA diblock copolymer layers were fabricated by Langmuir-Schaefer depositions and anal…
Heterotrimetallic {3d–5d–4f} compounds have been prepared by assemblage of {W(CN) 8 } 3− and {L Me2 NiLn} 3+ units, with Ln = Y ( 1 ) and La ( 2 ). These have been found to exhibit different supramolecular organizations. A chain structure is formed for Ln = Y, whereas La leads to a hexanuclear aggregate. The investiga…
We report here the synthesis of (CeO x ) 1− x (Al 2 O 3 ) x mixed-metal oxide nanopowders with molar ratios that span the CeO x −Al 2 O 3 composition range. Liquid-feed flame spray pyrolysis (LF-FSP) of mixtures of N(CH 2 CH 2 O) 3 Al (alumatrane) and Ce(O 2 CCH 2 CH 3 )(OH) precursors dissolved in ethanol were aeroso…
OBJECTIVES: To explore the feasibility of silk fibroin as a biomaterial coating used in tracheal defect reconstruction. METHODS: Silk fibroin was subcutaneously embedded in three rabbits and as an artificial implant material coating to reconstruct 12 rabbits' tracheal defects. The postoperative radiologic and histolog…
ADVERTISEMENT RETURN TO ISSUEPREVAddition/CorrectionBasic Amid Acid-Assisted Synthesis of Resorcinol−Formaldehyde Polymer and Carbon NanospheresYong-Rong Dong, Norikazu Nishiyama, Yasuyuki Egashira, and Korekazu UeyamaCite this: Ind. Eng. Chem. Res. 2008, 47, 16, 6344Publication Date (Web):July 24, 2008Publication His…
Colloidal platelets of hydrotalcite, a layered double hydroxide, have been prepared by coprecipitation at pH 11-12 of magnesium nitrate and aluminum nitrate at two different magnesium to aluminum ratios. Changing the temperature and ionic strength during hydrothermal treatment, the platelets were tailored to different…
An increased need for high‐temperature piezoelectric materials for sensors, some of which must be Pb free due to RoHS regulations, has led to a focused search for suitable materials. Glass–ceramic processing—the controlled crystallization of a precursor glass—offers a unique manner in which to produce partially to who…
This study presents a novel method for the preparation of Fe 3 O 4 /MS (M = Zn, Cd, Hg, Pb, Co, and Ni) nanocomposites via a sonochemical aqueous route. This method is mild, convenient, cheap, and efficient. A creditable synthetic mechanism for the formation of the nanocomposites has been proposed. It can be found tha…
Genome analyses have revealed that members of the Lrp/AsnC family of transcriptional regulators are widely distributed among prokaryotes, including both bacteria and archaea. These regulatory proteins are involved in cellular metabolism in both global and specific manners, depending on the availability of the exogenou…
Magnesia grain size affects the in situ spinel formation kinetics and expansion of alumina–magnesia refractory castables. The use of coarse grains results in a large expansion and delays the reaction's starting temperature. In this work, the addition of an MgO source with different grain sizes (from macro, D max ≤0.1…
The discoveries of superconductivity in the heavily-boron doped semiconductors diamond (C:B) in 2004 [Ekimov et al., Nature (London) 428, 542 (2004)] and silicon (Si:B) in 2006 [Bustarret et al., Nature (London) 444, 465 (2006)] have renewed the interest in the physics of the superconducting state of doped semiconduct…
Clathrasils go functional: Nanosized octadecasil crystals with tunable size and variable Si/Al ratio have been synthesized by controlled desilication of the parent clathrasil in alkaline medium. Extremely small (10–25 nm) nanocrystals with high external surface area (200 m2 g−1) and preserved crystallinity were attain…
The everyday routine of most chemists is dictated by large numbers. The chemical rules for ensembles of molar size (N approximately N(A)=6.022 x 10(23)) are well known and can be understood in most cases by using Boltzmann distribution. It is an interesting question how a small ensemble of a chemical system behaves an…
BaTi 0.98 Ca 0.02 O 2.98 (BTC) ceramics where Ca 2+ acts as an acceptor dopant show ferroelectric aging, reversible domain switching, and a nonlinear recoverable electrostrain of ∼0.04% at ∼11 kV/cm. This behavior is attributed to the mobility of oxide‐ion vacancies created by the acceptor doping mechanism and a tende…
The authors develop a plasma-free metalorganic chemical vapour deposition method to grow N-doped p-type ZnO films. The incorporation of the N acceptor and the corresponding change in the Fermi level are well confirmed by x-ray photoelectron spectroscopy. Temperature-dependent photoluminescence reveals the acceptor-rel…
In this work we present a detailed study about the influence of the host matrix in the spectroscopic and laser properties of Nd3+ in three different fluoride glasses. Site-selective time-resolved techniques have been used to investigate the crystal field changes felt by the Nd3+ ion as a consequence of glass inhomogen…
High‐temperature piezoelectrics are necessary for aeronautic and aerospace applications. The principal challenge for the insertion of piezoelectric materials is their limitation for upper use temperature, which is due to low Curie temperature and increasing conductivity at high temperatures. We investigated processing…