Materials Literature
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The structure of the metal-oxide interface and its effect on the stability of the corrosion layers, hydrogen uptake, and the global oxidation kinetics are studied using a systematic multi-scale characterization of the oxide layers formed on autoclaved Zircaloy-4 samples. The multi-scale approach made use of complement…
Accurate and simple measurements of the thermal conductivity of thin films deposited on high thermal conductivity substrates have been recently enabled by the development of an AC hot-wire method, the 3ω method. Recent progress in the measurement and understanding of heat transport in ultra-thin films (1 μm thick) and…
A square-shaped π-conjugated porphyrin tetramer has prepared: the excitation energies of both the Soret and Q bands, 19880 (503) and 15180 cm−1 (659 nm), respectively, are quite low compared with those for the monomer and reported cyclic porphyrin oligomers.
Amorphous calcium carbonate is formed by a surprisingly large number of organisms, bearing in mind how unstable it is. Organisms use amorphous calcium carbonate as temporary storage sites for ions, as precursor phases that transform into more stable crystalline calcium carbonate polymorphs, or in a stabilized form for…
Novel layered and open framework indium sulfide organic/inorganic hybrid materials have been synthesized via hydro- and solvo-thermal techniques. Considerable structural diversity within this family of compounds is realized through a variety of structural building units. DEA-InS-SB1 and -SB2 (both [(CH3CH2)2NH2]6In10S…
A new hybrid material with the composition [Zn1.9Al(OH)5.8][Cl2C6H3OCH2CO2·2.83H2O] has been synthesised via ion exchange of chloride by ions of a molecule belonging to the pesticide family, 2,4-dichlorophenoxyacetate (2,4D). The ion exchange in the zinc–aluminium–chloride layered double hydroxide, [Zn–Al–Cl], was inv…
One-step size-controlled synthesis of ZnSe quantum dots is studied and the obtained QDs are luminescent with the emission wavelength varying over a wide range (up to 100 nm) depending on the particle size; the single-molecular precursor is an air-stable bis(phenylselenolato)zinc N,N,N′,N′-tetramethylethylenediamine (T…
In this paper a method of anion exchange in layered double hydroxides (LDHs) based on the formation of a salt between an anionic and a cationic surfactant, which is extracted from aqueous solution into an organic unmixed phase, is discussed. Two Zn(II)–Cr(III) LDHs, synthesised by direct coprecipitation under constant…
Electrochemical double-layer capacitors, also known as supercapacitors or ultracapacitors, are electrical storage devices, which have a relatively high energy storage density simultaneously with a high power density. Recent developments in basic technology, materials and manufacturability have made supercapacitors an…
Abstract Property characterization of nanomaterials is challenged by the small size of the structure because of the difficulties in manipulation. Here we demonstrate a novel approach that allows a direct measurement of the mechanical and electrical properties of individual nanotube-like structures by in situ transmiss…
Palladium-catalyzed cross-coupling between 3,4-dialkoxyphenylboronic acids (1a–d) and 2,3,6,7,10,11-hexabromotriphenylene (2) provided 2,3,6,7,10,11-hexakis[3,4-bis(alkoxy)phenyl]triphenylenes, C18H6[C6H3(OCnH2n + 1)2]6 where n = 6, 8, 10, and 12 (3a–d). Cyclodehydrogenation of the aryl-substituted triphenylenes 3a–d…
Abstract The versatility of cis,cis,cis-1,3,5,7-tetrahydroxy-1,3,5,7-tetraisopropylcyclotetrasiloxane (1) as a precursor of cage and ladder siloxanes is presented. Compound 1 reacted with 1,3-dichloro-1,1,3,3-tetraisopropyldisiloxane in pyridine to give 1,3,5,5,7,7,9,11,13,13,15,15-cis-cisoid-cis-dodecaisopropyltricyc…
A conducting partially oxidized salt of TPP[Fe(Pc)(CN)2]2, which contains paramagnetic iron(III), has been obtained by electrocrystallization of TPP[Fe(Pc)(CN)2]. The crystal is composed of one-dimensional TPP arrays surrounded by slipped-stacked one-dimensional Fe(Pc)(CN)2 chains. This structure is isomorphous with T…
Only one photo-induced cyclization reaction occurs when two 1,2-dithienylethene photochromes are covalently joined. Attempts made to ring-close the second photochrome by prolonged irradiation quantitatively produced a rearranged product that could not be photobleached. Copyright © 2000 John Wiley & Sons, Ltd.
Microspheres of a polyelectrolyte complex hydrogel were prepared from chitosan and xanthan after interaction between the two polyionic polymers. Their biodegradation was studied vs. chitosan. Simulated gastric fluid (SGF, pH 1.2) and intestinal fluid (SIF, pH 7.5) both as biodegradation media and phosphate buffered sa…
The tensile stress–strain behavior and fracture properties of some new soybean oil based polymeric materials were investigated at room temperature. These materials were prepared by the cationic copolymerization of regular soybean oil, low saturation soybean oil (LoSatSoy oil), or conjugated LoSatSoy oil with styrene a…
This book reviews the major technical issues of the subject from an applications and systems perspective. It describes where today's aftertreatment are currently under research, and how aftertreatment can most effectively be integrated into a vehicle's powertrain. The text is organised according to eight specific prob…
Nanocomposite films consisting of metal nanoparticles embedded in a dielectric matrix were fabricated by simultaneous sputtering of a gold target and plasma-enhanced chemical vapor deposition of hydrogenated SiO2. The optical constants of the films were determined from spectroscopic ellipsometry measurements and were…
Previous studies have put into evidence the key role of a charge transfer excited state, noted X, in the primary steps of laser photolysis of sodium decatungstate solutions. In this work, we report a thorough study of the reactivity of the X transient towards different organic and inorganic substrates in acetonitrile…
Order-disorder, martensitic and magnetic transformations in the Ni2AlMn alloys have been investigated by differential scanning calorimetry (DSC), X-ray diffraction (XRD) and transmission electron microscopy (TEM) techniques. The critical temperatures corresponding to the above transformations have been determined. It…