Materials Literature
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The present study is focused on the vibrational and structural characterization of a set of disordered hydrogenated carbon nitride (a-CN:H) thin films grown by reactive sputtering. A comparative analysis of the experimental results as achieved by Raman and infrared (IR) spectroscopies is made. The disorder-induced fea…
We are presenting a three-dimensional model of MalK, the ABC subunit of the maltose transporter from Escherichia coli and Salmonella typhimurium. It is based on the recently published crystal structure of the closely related Thermococcus litoralis MalK. The model was used to identify the position of mutations affectin…
A temperature dependence of the optical energy gap E g (T) for the CdSxSe1−x quantum dots synthesized in a borosilicate glass matrix was investigated in the range of 4.2–500 K. It was demonstrated that this dependence reproduced the dependence E g (T) for bulk crystals and is described by the Varshni formula for $$\ba…
A new kind of demagnetizing factors is suggested, that express the local field in a ferromagnetic sample. An analytic expression is given for the case of a general rectangular prism and is compared with a generalization of the ballistic demagnetizing factor. These two factors are found to be nearly the same in the par…
Plasma technology is often used in textile industries. The aim of this study is to transpose this technology to wood in order to protect it when used outdoors. First experiments have shown that this kind of treatment can be applied either to bare or finished wood. In this study, different plasma coatings of wood surfa…
Abstract Impact performance is a primary concern in many applications of polymers. In this paper, finite element analysis (FEA) and ABAQUS/Explicit are used to simulate the deformation and failure of polymers in the standard ASTM D3763 multiaxial impact test. The specimen geometry and loading mode in this multiaxial i…
Abstract Boron compounds are emerging as promising materials for a wide range of applications in automotive and industrial lubrication systems. Several studies conducted on boron compounds have revealed that they exhibit desirable properties for preparing stable and compatible lubricant components for a new generation…
Extrazelluläre polymere Substanzen (EPS)sind Biopolymere mikrobieller Herkunft und bestehen hauptsächlich aus Polysacchariden, Proteinen, Lipiden und Nucleinsäuren. Die EPS sind für die Adhäsion von Mikroorganismen an Oberflächen verantwortlich und sie bilden eine Hydrogelmatrix für Biofilme und andere mikrobielle Agg…
Poly(styrene sulphonic acid)-doped polyaniline has been synthesized and the influence of this polymeric compound on the inhibition of corrosion of mild steel in 1M HCL has been investigated using weight loss measurements, galvanostatic polarisation studies, electropermeation studies and a.c. impedance measurements. Th…
An experimental arrangement is demonstrated that overcomes some difficulties in thermo-mechanical testing of thin Shape Memory Alloy (SMA) wires under uniaxial tension. It is now well known that stress-induced transformations in some SMAs under uniaxial loading can lead to mechanical instabilities and propagating phas…
High resolution x-ray fluorescence spectra have been recorded for emission in different directions from a single crystal of the compound [Rh(en)3][Mn(N)(CN)5]⋅H2O. The spectra are interpreted by comparison with density functional theory (DFT) electronic structure calculations. The Kβ″ line, which is strongly polarized…
Many animal species display exceptionally bright iridescent coloration caused by interference or diffraction from a periodic surface microstructure. Although many mollusks are colored, only few utilize such a form of structural coloration. We are not referring to the well-known pearly appearance that is due to the nac…
The photoluminescence spectrum of melt-grown GaSe single crystals was investigated with a confocal Raman microscope equipped with a HeNe laser. Three luminescence bands of different intensity were observed, which are mainly located to the blue of the laser line. The luminescence signals show a quadratic dependence on…
We have studied experimentally, by using a differential interferometric technique, the effect of proton radiation on the refractive index of commercial (Schott) silicate crown glasses, BK7 and LaK9, and their radiation-resistant counterparts. The strongest effect was observed for the radiation-hard lanthanum crown LaK…
Mullite whiskers were synthesized by heating a mixture of SiO 2 and silicon in an alumina tube reactor under a flow of H 2 and CF 4 . The length and diameter of the whiskers were several hundred micrometers and >15 μm, respectively. It was postulated that a vapor phase reaction between SiF 4 and AlF 3 made possible…
We report the synthesis and photophysical properties of 1,4-bis(9-ethynylanthracenyl)benzene. Results in dilute hexane solutions give a very high fluorescence quantum yield (Φ = 0.97) and a lifetime of τ = 1.8 ns. Studies at different temperatures, viscosities, and micromorphologies, as well as excited-state semiempir…
Nanostructured, mesoporous inorganic–organic hybrid xerogels were reproducibly synthesized by a sol–gel procedure. For the introduction of long alkyl chains into inorganic polymers, trifunctional n-alkyltrialkoxysilanes of the type CH3(CH2)nSi(OR)3 (n = 7, 11, 17; R = CH3, C2H5) were co-condensed with Si(OEt)4 (TEOS).…
Regioregular poly(propylene oxide), PPO, formed by simple base (KOH) and coordinate base (TPP)AlCl, (tetraphenylporphinato)aluminum chloride, ring-opening polymerization of propylene oxide, PO, has been studied by high field 13 C{ 1 H} NMR spectroscopy at various concentrations in CDCl 3 and C 6 D 6 . The original ass…
Abstract Clinoptilolite-rich materials from widespread pyroclastic and epiclastic deposits of northern Sardinia were investigated to assess their cation exchange properties and to find the most reliable experimental method to determine their cation exchange capacity (CEC). The CECs were evaluated using a cross exchang…
Heterocyclic compounds, namely 3,5-diphenyl-imino-1,2,4-dithiazolidine (DPID); 3-phenyl-imino-5-chlorophenyl-imino-1,2,4-dithiazolidine (PCID); 3-phenyl-imino-5-tolyl-imino-1,2,4-dithiazolidine (PTID); and 3-phenyl-imino-5-anisidyl-imino-1,2,4-dithiazolidine (PAID), were synthesized in the laboratory. Their influence…