Materials Literature
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The Si L 2, 3 x-ray absorption near-edge structure (XANES) spectra of porous silicon nanomaterials and nanostructures with epitaxial silicon layers doped by erbium or containing germanium quantum dots are measured using synchrotron radiation for the first time. A model of photoluminescence in porous silicon is propose…
Polyaniline, polypyrrole, poly( N-ethyl aniline), poly( O-anisidine) and their composite coatings were electrodeposited on Al-2024 alloy. The electrodeposited films were characterised using IR spectroscopy. The peel test (ASTM 3359-97), the lap joint test (ASTM D1002) and electrochemical impedance spectroscopy were us…
Nous avons resolu la structure cristalline de l'analogue synthetique de la radtkeite, Hg 2 + 3S 2 ClI [monoclinique, groupe spatial C2/m, Z = 8, a 16.827(4), b 9.117(1); c 13.165(5) A, β 139.17(2)°, V 1543.2(7) A 3 ], par methodes directes, et nous l'avons affine jusqu'a un residu R de 5.27%, en utilisant 1498 reflexi…
Abstract The Markovian model of mixed-layering that has been used until now for the modeling of X-ray diffraction (XRD) patterns of 2:1 phyllosilicates describes the mixed-layer crystals as stacks of ‘layer units’ (LUs) that associate a 2:1 layer with an interlayer content. This model is not consistent when it is appl…
A mode of cracking termed Type IIIa has been found to occur in the welds of ½CrMoV pipework systems in the UK. This cracking mechanism is not as well documented as the more familiar Type IV cracking, which occurs on these and other ferritic steel systems, but is likely to increase in importance as plant ages. This pap…
Three effects of nano-particles on the toughness of nano-composite ceramics, namely, nano-particle clustering, crack pinning, and transgranular fracture, are identified from both the experimental and analytical studies. It is found that crack pinning toughens the nano-composite ceramics because a higher stress intensi…
Zinc phosphate and related compounds have achieved wide application as suitable replacements for toxic and pollutant zinc Chromates and lead oxides which were employed as anticorrosive pigments for paints. The behaviour of inorganic phosphates and tripolyphosphates may be improved by a suitable selection of complement…
Complex phase (CP) steels have very high ultimate tensile strengths, resulting from the use of specific alloying elements, which improve the hardenability but cause difficulties when applying a zinc coating by means of continuous hot‐dip galvanizing. The galvanizability of a cold rolled 1000MPa complex phase steel was…
Görgeyite, K 2 Ca 5 (SO 4 ) 6 ·H 2 O, is a very rare monoclinic double salt found in evaporites related to the slightly more common mineral syngenite. At 1 atmosphere with increasing external temperature from 25 to 150 °C, the following succession of minerals was formed: first gypsum and K 2 O, followed at 100 °C by g…
The stresses of laminate structures obtained by joining single layers of pure alumina (A), pure yttria‐stabilized tetragonal zirconia, 3Y‐TZP (Z), and an intimate mixture of alumina and zirconia (AZ) have been determined by fluorescence (in alumina) and Raman (in zirconia) piezospectroscopy. Three symmetrical stacking…
The formation of water-soluble coordination polymers was studied for a bifunctional monomer consisting of two terpyridin groups bridged by a poly(ethylene oxide) spacer. The complex formation between the terpyridin ligand groups and Cd 2+ ions was demonstrated using UV/vis spectroscopy and potentiometric titration. Vi…
Abstract Amorphous Se was converted into fibrous crystals of hexagonal Se or polyhedral crystals of α-monoclinic Se when exposed to organic fluids at room temperature for several days. The growth phase was dependent upon the dielectric constant of the organic liquids. It is notable that hexagonal Se and α-monoclinic S…
Abstract The properties of Si-associated goethite from sediments in the Atlantis II and Thetis Deeps in the Red Sea have been investigated in order to determine the effect of Si on the mineral. Two types of morphologies dominate in most samples: multi-domain crystallites, probably due to elevated Na concentration in t…
Abstract Summary: Dielectric cyclosiloxane bearing polysilsesquioxanes (CS‐PSSQs) were prepared by acid catalyzed polymerization using 2,4,6,8‐tetramethyl‐2,4,6,8‐tetra(trimethoxysilylethyl)cyclotetrasiloxane. The molecular weight, and content of the functional end‐groups of the CS‐PSSQs were found to be dependent on…
Corrugated quantum-well infrared photodetectors (C-QWIPs) offer simple detector architectures for large-format infrared focal plane arrays (FPAs). The detector relies on inclined sidewalls to couple normal incident light into the absorbing material. Based on a simplified geometrical-optics (GO) model, this light coupl…
Abstract Pre‐irradiation grafting of styrene/divinylbenzene (DVB) onto poly(tetrafluoroethylene‐ co ‐hexafluoropropylene) (FEP) films from isopropanol ( i PrOH) solution was investigated with respect to the effect of irradiation dose, film thickness, cross‐linker concentration, and reaction temperature. A mathematical…
Chained Si species were synthesized in Y-type zeolite supercages by the reaction with phenylsilane (PhSiH 3 ) at 423 K. The preparation process was studied with the infrared spectra, and the prepared Si species were characterized with X-ray photoelectron spectroscopy (XPS), photoluminescence (PL) spectra, and ultravio…
The Gains-Thomas ion exchange selectivity coefficients, KGT of Fe2+ and Mn2+ on three types of Ca2+-saturated clay minerals (kaolinite, montmorillonite, and illite) were determined in an oxygen-free condition in order to understand better the behaviors of these ions in anaerobic soils. The average ion exchange selecti…
A smectic A–cholesteric phase transition for a rigid-rod helical polymer, poly[n-decyl-(S)-2-methylbutylsilane] (PD2MBS), with a narrow molecular weight distribution, has been observed for the first time. Polarizing optical microscopy showed that the fan-shaped texture of the smectic A phase turned into the characteri…
Garment is presumably the only product where, in the tailoring process, a two‐dimensional fabric is converted into a three‐dimensional shape without indirect physical remodelling of the material. Such a remodelling is directly associated with the physical behaviour of fabric structure, which can be treated as a very c…