Materials Literature
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The phase diagram of elemental liquids has been found to be surprisingly rich, including variations in the melting curve and transitions in the liquid phase. The effect of these transitions in the liquid state on the shape of the melting curve is analyzed. First-order phase transitions intersecting the melting curve i…
Abstract The orbital magnetic moments in magnetite have recently been discussed with strong controversy. Here, the presence of orbital moments has been revealed by the independent analysis of the Fe L 2,3 edge X‐ray absorption spectroscopy (XAS) spectra, a moment analysis fit of the Fe L 2,3 edge X‐ray magnetic circul…
The reaction of electrons stored on TiO 2 nanoparticles with silver ions in aqueous solution has been studied employing the stopped flow technique. Prior to the kinetic experiments, nanosized TiO 2 particles were loaded with electrons by UV (A) photolysis in the presence of methanol. The formation of silver nanopartic…
We examine the appearance of the experimentally observed stripe spin-density-wave magnetic order in five different orbital models of the iron pnictide parent compounds. A restricted mean-field ansatz is used to determine the magnetic phase diagram of each model. Using the random phase approximation, we then check this…
Single-crystal OFET: Single-crystals of new porphyrin derivatives TTPH2 and TTPZn were obtained from slow diffusion of solvents (see graphic). The organic field-effect transistor (OFET) devices based on these single crystals show relatively high mobilities of 6.2×10−2 cm2 V−1 s−1 for TTPH2 and 0.32 cm2 V−1 s−1 for TTP…
Sodium metaborate hydrates are a class of compounds represented by the stoichiometry NaBO 2 · x H 2 O. Recently, sodium metaborate has received attention as the byproduct of sodium borohydride hydrolysis, a reaction that is under consideration for hydrogen storage applications. The aim of this work was to understand t…
Mathematical diffraction theory is concerned with the analysis of the diffraction image of a given structure and the corresponding inverse problem of structure determination. In recent years, the understanding of systems with continuous and mixed spectra has improved considerably. Simultaneously, their relevance has g…
Abstract This work aims to develop halogen‐free poly(1,4‐butylene terephthalate) (PBT) composites with enhanced flame retardancy using ecofriendly flame retardants, aluminum hypophosphite (AHP) and melamine derivatives (melamine polyphosphate and melamine cyanurate). Microscale combustion calorimetry and thermal gravi…
Copper and zinc phthalocyanines and porphyrins are used in organic light emitting diodes and dye-sensitized solar cells. Using near edge x-ray absorption fine structure (NEXAFS) spectroscopy at the Cu 2p and Zn 2p edges, the unoccupied valence states at the Cu and Zn atoms are probed and decomposed into 3d and 4s cont…
Abstract Biodegradable polycaprolactone/organoclay nanocomposites were prepared by solvent casting, using different amounts of filler and matrices differing by average molecular weight. Intercalated nanocomposites were obtained. The nanocomposites were characterized by wide‐angle X‐ray diffraction (WAXD) and small‐ang…
Pure manganese titanate (MnTiO3) nanopowders have been synthesised by stearic acid gel method. Structural investigations by X-ray diffraction and scanning electron microscopy confirm that the synthesised material is MnTiO3 with rhombohedral crystal structure. Transmission electron microscopy showed that the particle s…
An improved chemical one-step method (ICOSM) was used to prepare highly conductive and magnetic polypyrrole/γ-Fe 2 O 3 (PPy/γ-Fe 2 O 3 ) nanospheres ∼80 nm in diameter. In the reaction process involved, FeCl 3 acts as an oxidant for the polymerization of pyrrole and as a source of Fe III for the formation of γ-Fe 2 O…
The DCFH assay is commonly used for measuring free radicals generated by engineered nanomaterials (ENM), a well-established mechanism of ENM toxicity. Concerns exist over susceptibility of the DCFH assay to: assay conditions, adsorption of DCFH onto ENM, fluorescence quenching and light scattering. These effects vary…
Visible light exposure of films containing silver nanoparticles (AgNPs) shows that the enhanced field around AgNPs in a thin film containing an azo free radical initiator (AIBN) and a triacrylate selectively cross-links the triacrylate within the plasmonic region around the particles. The cross-linked polymer is less…
The ultra low density, high electrical conductivity, and mechanical robustness of carbon nanotube aerogels (SWNT-CA) make them ideal scaffolds around which to create novel composites. Here we report on the synthesis and characterization of oxide/carbon nanotube composites fabricated through the sol–gel deposition of o…
We have investigated the novel single-molecule magnet (NEt(4))[Mn(2)(5-Brsalen)(2)(MeOH)(2)Cr(CN)(6)] (1; 5-Brsalen = N,N'-ethylenebis(5-bromosalicylidene)iminato anion) using spectroscopic as well as magnetization and susceptibility measurements. Frequency-domain Fourier-transform terahertz electron paramagnetic reso…
Abstract Short ramie fiber (RF) was used to reinforce the polypropylene (PP). The composites were prepared in a twin‐screw extruder followed by injection molding. The experimental results showed that both the strength and the modulus of the composites increase considerably with increasing RF content. The tensile stren…
The Condon approximation is widely applied in molecular and condensed matter spectroscopy and states that electronic transition dipoles are independent of nuclear positions. This approximation is related to the Franck-Condon principle, which in its simplest form holds that electronic transitions are instantaneous on t…
A series of protected phenylalanine and diphenylalanine derivatives have been coupled through a peptide bond to a monoaminoporphyrin to form new materials. A comparative study in solution and in the solid state has been performed and confirmed new and interesting properties for the self-assembled hybrid materials whil…
Nonspherical metal nanoparticles are very attractive plasmonic nanostructures owing to the facile tunability of the plasmonic properties and the presence of sharp corners and edges, which act as electromagnetic hot spots for surface enhanced Raman scattering (SERS). However, such anisotropic nanostructures exhibit str…