Materials Literature
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Bilindiones and biladienones carrying aryl groups at the meso positions were prepared using coupled oxidation reactions of iron tetraarylporphyrins in 20-63% yield.
Spatial point pattern analysis methods [ A Population Perspective-Statistical Ecology, Kluwer Academic Publishers , Boston (1998) ; Statistics for Spatial Data, Wiley-Interscience Publications , New York (1993) ; Statistical Analysis of Spatial Point Patterns, 2nd ed. , Arnold Publishers , London (2003) ; Spatial Stat…
Abstract Electrical properties of Er‐doped SnO 2 thin films obtained by sol‐gel‐dip‐coating technique were measured. When compared to undoped tin dioxide, rare‐earth doped films present much higher resistivity, indicating that Er 3+ presents an acceptor–like character into the matrix, which leads to a high degree of e…
A new indicator of the potential for the formation of an equiaxed zone during alloy solidification is proposed. The indicator, or equiaxed index, is calculated from the predictions of a numerical model of non-equilibrium columnar solidification. This model uses a front-tracking approach to simulate the nucleation and…
Disagreements on the Raman gain response of different tellurite-based glasses, measured at different wavelengths, have been recently reported in the literature. In order to resolve this controversy, a multi-wavelength Raman cross-section experiment was conducted on two different TeO2-based glass samples. The estimated…
Electropolymerization of the title compound leads to a conjugated polymer with redox potential, band gap, optical transparency in the doped state and stability similar to those of PEDOT.
Ultracapacitors, also known as electrochemical double-layer capacitors (EDLCs) or supercapacitors have been around for decades and first appeared as low-power, low-energy, long-life backup devices, but until recently had few other applications. This article outlines the technology behind ultracapacitors and presents a…
Two series of functional copolymer microparticles were simply synthesized via an oxidative polymerization of o- and m-chloroanilines (OC and MC) and aniline (AN) in HCl aqueous medium, for a detailed comparison between OC/AN and MC/AN copolymers. The polymerization characteristics, structures, and properties of the co…
Abstract Montmorillonite clays (MMT) have shown potential as non‐halogenated fire retardants in polymer blends, but the effect of morphology of the resulting nanocomposite is not well understood. In this article MMT blends are studied in a styrene‐acrylonitrile copolymer (SAN) matrix to get structure–property relation…
We have studied magnetic orderings of a ferroelectric TmMn 2 O 5 by single-crystal neutron diffraction and dielectric measurements. Below T N1 = 44 K, TmMn 2 O 5 shows the sequence of magnetic phase transitions at T = 36.4, 35.1 and 24.9 K, associated with changes in the magnetic propagation vector q = ( q x ,0, q z )…
Resonance stabilized bis-1,2,3-thiaselenazolyl radicals associate in the solid state to afford Se-Se sigma-bonded dimers.
Dehydroxylation and incorporation of CO 2 in mica (sericite-2M 1 ) during high-temperature annealing has been investigated in detail using infrared (IR) spectroscopy. The dehydroxylation is characterized by a dramatic change of the OH - ion spectrum and the appearance or development of different extra species (CO 2 ,…
Abstract Gadolinium nanoparticles, deposited via an inert gas evaporation method, show improved stability towards oxidation and it is therefore possible to carry out an ex‐situ investigation on “bare” Gd nanoparticles, i.e., in the absence of a protective Pd layer, for the first time. A size‐induced structural transfo…
Electrodeposition was used to fabricate metallic CoNiCu and Cu nanotubes in polycarbonate membranes. The tubes were obtained from a low-efficiency CoNiCu electrolyte, critical to the evolution of tube formation. Tube wall thickness was assessed and alloy tubes filled with Cu metal demonstrated. A high-efficiency elect…
Diatoms produce diverse three-dimensional structures that, due to their exponential rate of growth, may be of use in the manufacture of components for nanotechnology as an alternative to present linear lithographic techniques. Vapor replacement of the silicon permits the conversion of diatom silica valves and other st…
Syntheses of enantiopure organosulfur donors by three different strategies requiring only four-six steps are reported. The key step involves either double substitution of an enantiopure cyclic sulfate ester by a dithiolate, attachment of a chiral diol as a ketal, or completely diastereoselective cycloaddition of 1,3-d…
Rigid, highly conjugated tetraalkynyl-calix[4]arenes synthesised via Sonogashira coupling give rise to improved second-order hyperpolarizability values as determined by hyper-Rayleigh scattering--a technique that in addition to X-ray crystallography also allows for the conformational analysis of the calixarene structu…
The photorelease of a caged neurotransmitter can be used to investigate the function of neuronal circuits in tissues. We have designed and synthesized a stable, caged gamma-aminobutyric acid (GABA) derivative, 4-[[(2H-1-benzopyran-2-one-7-amino-4-methoxy)carbonyl]amino] butanoic acid (BC204), that releases the neurotr…
Micropolar theories offer a possibility to model size effects in the constitutive behaviour of materials. Typical feature of such models is that they deal with a microrotation, which is supposed to represent an independent state variable, and its space gradient. As a consequence, the stress tensor is no longer symmetr…
This paper describes the synthesis of nanostructured ZnO crystals by nanoparticle-assisted pulsed-laser deposition (NAPLD), in which nanoparticles formed in the gas phase by the condensation of the ablated species are transported onto the substrate. The influence of the synthesis conditions on the morphologies of the…