Materials Literature
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Abstract A number of bentonitic clay deposits from the Ordu area (NE Turkey) have been investigated by optical and electron microscopy, X-ray diffraction and chemical analysis. The clays are the alteration products of Late Cretaceous trachytic and trachyandesitic pyroclastic rocks. They contain volcanogenic sanidine,…
Abstract We have previously reported that small quantities of self‐assembling molecules known as dendron rodcoils (DRCs) can be used as supramolecular additives to modify the properties of polystyrene (PS). These molecules spontaneously assemble into supramolecular nanoribbons that can be incorporated into bulk PS in…
Accurate deposition of boron and silicon carbides and nitrides permits to improve the oxidation resistance of self‐healing matrices of multilayered composites. The uniformity and the microstructure of each layer and of their interfaces induce the final properties of these composites. Their mechanical behaviour in cond…
Abstract Diarylethene is a photochromic molecule, which is potentially applicable to various optoelectronic devices. In diarylethenes the π-system of the two aryl rings is separated in the open-ring isomer, while the π-system is delocalized throughout the molecule in the closed-ring isomer. Based on this idea the exch…
The antiferromagnetic-to-ferromagnetic transition in $\mathrm{Sr}{\mathrm{Fe}}_{1\ensuremath{-}x}{\mathrm{Co}}_{x}{\mathrm{O}}_{3}$ $({x}_{c}\ensuremath{\simeq}0.15)$ induced by Co doping has been studied by magnetic circular x-ray dichroism. The orbital and spin magnetic moments of the Fe and Co $3d$ states under the…
Abstract A new n‐dopable polyketone, poly[(5‐(2,5‐dihexyl‐4‐(thiophen‐2‐yl)phenyl)thiophen‐2‐yl)(4‐ketophenyl)methanone] (PTK), is synthesized via Friedel–Crafts acylation. Though insulating in the neutral state, PTK becomes conductive upon electrochemical reduction. The stable, two‐electron, fully reversible reductio…
Abstract Double network elastomers were prepared by curing under strain previously-crosslinked natural rubber or styrene-butadiene copolymer. The rubbers were reinforced with carbon black, so that the conventional (singly-cured) materials exhibited a substantial Payne effect, reflecting agglomeration of the filler par…
Shear moduli were determined for chemically polymerized and solvent cast regioregular poly(3-hexylthiophene) films, using thickness shear mode acoustic wave resonators. The results are strikingly different to those for electropolymerized regiorandom poly(3-hexylthiophene) films. The time scale of the measurement was v…
We present an extension to our earlier proposed statistical model [Phys. Rev. B 62, 15628 (2002)] for studying migration-assisted homogeneous upconversion in erbium-doped fibers. The extension takes into account minimum proximity distance between erbium ions randomly distributed in the host material and the nonuniform…
The synthesis of a phthalocyanine-porphyrin heteropentamer (zinc(II) tetra(5-phenoxy-10,15,20-triphenylporphyrin)) zinc(II) phthalocyanine, ( ZnPc -( ZnTPP ) 4 ), containing four units of zinc tetraphenylporphyrin linked to a central zinc phthalocyanine macrocycle via an ether linkage is reported. The photophysical pa…
Abstract Inorganic–organic hybrid materials were prepared with a cycloaliphatic epoxide adduct of linseed oil with tetraethylorthosilicate (TEOS) oligomers via a cationic UV‐curing process. The TEOS oligomers were prepared in the presence of water and ethanol with hydrochloric acid as a catalyst. The TEOS oligomers we…
W.B. Chiasson, N.J. Sabo and M.L. Vis. 2005. Affinities of freshwater putative chantransia stages (Rhodophyta) from molecular and morphological data. Phycologia 44: 163–168.Fourteen putative bluish...
Hydrogen permeation through four steel plates of varying thickness was achieved by simultaneously exposing one face of each plate to standard, sour corrosive conditions for periods of several days. A single representative structural steel had been used to mill the plates. The hydrogen flux at the opposing plate faces…
Abstract The effect of montmorillonite (Cloisite 6A) on the bulk polymerization of styrene initiated by benzoyl peroxide (BPO) was studied by the dilatometric determination of the polymerization rates. The bulk polymerization rates increased as the montmorillonite input quantity increased. The effect became greater wh…
MCM-48 was synthesized using the microwave hydrothermal method. The material was characterized by means of powder XRD, NMR, sorption measurement, SEM and transmission electron microscopy (TEM). XRD, NMR confirm the topology of the silicate framework, TEM shows the periodicity and homogeneity of the MCM-48 frame struct…
The extended LEPS of O(2)-Cu single crystal plane systems is constructed by means of 5-MP (the 5-parameter Morse potential). Both the adsorption and dissociation of O(2) on Cu low-index surfaces are investigated with extended LEPS in detail. All critical characteristics of the system that we obtain, such as adsorption…
A new component of carbon nanotube (CNT) paste is explored with an attempt to develop a carbon nanotube field emitter backlight unit (CNT-FE BLU) fabricated by the screen-printing method. To reduce the residual organic binder materials on the surface of single-wall carbon nanotube (SWCNT), the P(MMA-co-BMA) random cop…
The finding that ordered mesostructured silica (OMS) matrixes can stabilize guest nanocrystals has transformed the preparation of advanced catalytic materials. Today, it is possible to tailor the materials in such a way that high loading of guest catalytic phases (CPs) may be achieved at different locations in the hos…
When high strength steels absorb hydrogen during corrosion of a sacrificial coating they can fail by a process termed hydrogen re-embrittlement. This paper compares the levels of re-embrittlement caused by coatings of electroplated cadmium and two possible alternative aluminium based coatings. Slow strain rate tests w…
Abstract Self‐assembled ordered structures composed of block copolymers are simulated by molecular dynamics under stress‐free conditions and under shear. We address several methodological points. The system must be allowed to adjust its size to accommodate natural periods of self‐assembled structures. In addition, the…