Materials Literature
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The measurement and analysis of leakage current (LC) for condition-based monitoring of, and as a means of predicting flashover of polluted insulators has attracted a lot of research. Results presented in the technical literature show that surface arcing of contaminated insulators causes significant variations in the m…
Calcium sulphate subhydrates (CaSO4 · x H2O, 0 < x ≤ 0.8) have a honeycomb-shaped channel structure. The symmetry is either trigonal or a slight deviation thereof. Due to insufficient diffraction data and the high pseudosymmetry of the structure, it is not possible at this point to determine with certainty the specifi…
Single-walled (SWNTs) and multiple-walled (MWNTs) carbon nanotubes were solubilized via the esterification of nanotube-bound carboxylic acids by oligomeric polyethylene glycol compounds. The water-soluble samples were used as starting materials in reactions with bovine serum albumin (BSA) protein in ambient aqueous so…
Particulate-filled composites were prepared from CaCO 3 and polymer matrices of various acid-base characters. Interfacial interaction of the components was characterized by the reversible work of adhesion, which was calculated either from dipole-dipole or acid-base interactions. The thickness of the spontaneously form…
Alginate, chitosan and gelatin were deposited on the surface of PDL-LA films via an entrapment method. ATR-FT-IR, XPS and contact-angle analyses revealed the formation of stable thin biomacromolecule layers on the PDL-LA film, thus enhancing the hydrophilicity of the films. Confocal laser scanning microscopy showed th…
Abstract We have studied the influence of the addition of poly(butylene terephthalate) (PBT) to poly(ethylene‐ co ‐ethyl acrylate)‐carbon black (EEA‐CB) on the electrical properties of the blends, namely the resistivity and power dissipation of the monophasic and diphasic systems. The morphology of the latter blend is…
DNA Photolyase is a flavoprotein that uses light to repair cyclobutylpyrimidine dimers in DNA. From considerations of the crystal structure of the protein, it has been hypothesized that the dimer lesion is flipped out of the DNA double helix into the substrate binding pocket. We have used a fluorescent adenine analog,…
Abstract A well-ordered mesoporous carbon material has been prepared by a one-step chemical vapour infiltration process starting from a MCM-48 silica template.
Abstract The feasibility of constructing polymer/clay nanocomposites with polypeptides as the matrix material is shown. Cationic poly‐L‐lysine · HBr (PLL) was reinforced by sodium montmorillonite clay. The PLL/clay nanocomposites were made via the solution‐intercalation film‐casting technique. X‐ray diffraction and tr…
Bis(3-thienyl)- and bis(2-thienyl)ethenes having nitronyl nitroxide radicals at both ends of the molecules were synthesized. Bis(3-thienyl)ethene diradicals underwent a reversible photochromic reaction by irradiation with UV and visible light. Photoswitching of intramolecular magnetic interaction was proved by EPR spe…
The radiation crosslinking of poly(L-lactide) (PLLA) was investigated using triallyl isocyanurate (TAIC) as a crosslinking agent. The gel fraction of crosslinked PLLA increased with TAIC concentration and γ-ray dose. Crosslinking of PLLA started at low TAIC contents and low γ-ray dosage. Differential scanning calorime…
Abstract Recent advances in surface grafting of polymers onto carbon materials, such as carbon black, graphite powder, and carbon fiber, and the application of polymer-grafted carbon materials as a novel functional materials have been mainly reviewed. The grafting of polymers onto the surface was achieved by (1) graft…
A mesoporous silica film was prepared on a silicon substrate using a spin-coating process followed by a tetraethyl orthosilicate (TEOS) vapor treatment. The TEOS-treated mesostructured silica film did not contract during calcination, showing high structural stability. Thermal treatment without TEOS vapor was not effec…
Palladium complexes of a variety of β- and γ-iminophosphines have been prepared and characterized by X-ray diffraction studies. Their properties as catalyst for three different Stille coupling reactions have been investigated and compared to catalytic performances of a phosphorus-containing dendrimer incorporating ana…
We present a real-time investigation of ultra-fast carrier dynamics in single-wall carbon nanotube bundles using femtosecond time-resolved photoelectron spectroscopy. The experiments allow us to study the processes governing the sub-picosecond and the picosecond dynamics of non-equilibrium charge carriers. On the sub-…
ABSTRACT: Protein films [cast corn zein (CCZ), heat‐pressed corn zein (HPCZ), cast wheat gluten (CWG), and heat‐pressed wheat gluten (HPWG)] were studied at different exposure temperatures (5, 25, 35, and 45 °C) to determine nisin diffusion in aqueous model systems. Kinetics of nisin diffusion in protein films followe…
X-ray structures of proteins bound to ligand molecules containing a nucleic acid base were systematically searched for cation-pi interactions between the base and a positively charged or partially charged side chain group located above it, using geometric criteria. Such interactions were found in 38% of the complexes…
A magnetic cluster is a group of magnetic ions (“spins”) that interact with each other but which, to a good approximation, do not interact with other magnetic ions. Such clusters are responsible for many of the interesting and useful properties of a large number of molecular crystals, and of dilute magnetic materials…
We find no physical basis for traditional mass-fraction weighted averaging of X-ray continuum measured in pure elements to estimate continuum production from compounds. Measurements of continuum from pairs of stable isotopes demonstrate that mass alone (the presence of more or fewer neutrons) has no effect on continuu…
The reinforcement of rubber by fillers is of great practical and technical importance. Bone meal waste and Ca(HPO 4 ) 2 , were evaluated as reinforcing fillers for natural, chloroprene rubber and their blend comparing them with white conventional filler, CaCO 3 . It was clearly seen that, the properties of the recomme…