Materials Literature
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Two-dimensional (2D) functions with wallpaper group symmetry can be written as Fourier series displaying both translational and point-group symmetry. We elaborate the symmetry-adapted Fourier series for each of the 17 wallpaper groups. The symmetry manifests itself through constraints on and relations between the Four…
Mucoadhesive polymers have gained much attention due to the possibility to overcome physiological barriers in long-term drug delivery. Chitosan is a biocompatible and non-toxic chitin derivative, which due to its mucoadhesive properties enables to obtain prolonged drug delivery. The aim of this study was to formulate…
We focus on the description of a complex mechanism whereby the graphene electronic properties vary in the case of graphene hydrogenation as periodic graphene/graphane structures are formed. Two nonmonotonic dependences of the band gap on the hydrogen concentration and on the arrangement of adsorbed hydrogen atoms on t…
We have synthesized two iron-pnictide/chalcogenide materials, CuFeTe 2 and Fe 2 As, which share crystallographic features with known iron-based superconductors, and carried out high pressure electrical resistivity measurements on these materials to pressures in excess of 30 GPa. Both compounds crystallize in the Cu 2…
Beneath the sheets: (31) P NMR data suggests that phosphates are liberated freely in the interlayer of a cobalt-hydroxide water-oxidation catalyst. The cobalt-hydroxide sheets are separated by an interlayer region with water, counterions and phosphate, which help to shuttle protons as the layer develops charge.
Abstract Bi2O3 nanostructures with high surface‐to‐volume ratio are attracting particular interest in catalysis, gas sensors, solar‐energy conversion, and so on. In this paper, we present the impact of annealing on morphology, structure, and optical properties of Bi2O3 nanotube‐based urchin‐like microarchitectures, wh…
We present a theory of the Josephson effect in a twofold-tilted Josephson junction made by $d$-wave anisotropic layered superconductors. We find the appearance of an intrinsic electrical resistance that arises from the misalignment of the superconductive planes (the CuO${}_{2}$ planes in YBCO) in the two electrodes. T…
The branched-chain amino-acid aminotransferase from Streptococcus mutans (SmIlvE) was recombinantly expressed in Escherichia coli with high yield. An effective purification protocol was established. A bioactivity assay indicated that SmIlvE had aminotransferase activity. The specific activity of SmIlvE towards amino-a…
In this paper, a novel signal processing circuit which can be used for the measurement of H(+) ion and urea concentration is presented. A potentiometric method is used to detect the concentrations of H(+) ions and urea by using H(+) ion-selective electrodes and urea electrodes, respectively. The experimental data show…
Background: In this study, we aimed to compare vasoconstriction and vasodilatation responses of saphenous vein grafts (SVG) harvested by conventional and no touch techniques in tissue bath system. Methods: Between February 2007 and September 2007, 12 patients (10 males, 2 females; mean age 55.6±5.8 years; range 38 to…
Objective Nonionic iodinated contrast agents (CAs) can be divided into monomeric, low-osmolar, and dimeric, iso-osmolar classes. In clinical practice, renal tolerance of CAs is a concern, especially in patients with impaired renal function. With regard to renal safety, we wanted to evaluate the role of osmolality and…
Abstract “Ratcheting” is a phenomenon which leads to reduction in fatigue life of a structural component by loss of ductility due to cycle by cycle accumulation of plastic strain. Ratcheting occurs in a structure subjected to a combination of steady/sustained and cyclic loads such that the material response is in inel…
LaO(2) was produced in a pulsed laser-vaporization molecular beam source and studied by mass-analyzed threshold ionization (MATI) spectroscopy and ab initio electronic structure calculations. The calculations included density functional theory, second-order perturbation theory, coupled cluster theory, and complete act…
H(2)O@C(60) derivatives covalently linked to a nitroxide radical were synthesized. The (1)H NMR of the guest H(2)O revealed the formation of many isomers with broad signals. Reduction to the diamagnetic hydroxylamines sharpened the (1)H NMR signals considerably and allowed for an "isomer count" based on the number of…
SiC thin film has been synthesized by using conventional 13.56MHz radio frequency plasma enhanced chemical vapour deposition (PECVD). The mixture of silane (SiH4) and methane (CH4) were used as precursor gases while hydrogen as carrier gas. The SiH4/CH4 ratio and the substrate temperature have been varied in order to…
A golden opportunity: Chemoselective reactivity for the hydrogenation of acetone and propionaldehyde on H-covered gold is described. Propionaldehyde forms 1-propanol, whereas no hydrogenated product is detected from the interaction between acetone and hydrogen. Dissimilar energetic barriers and the polymerization of C…
Abstract A series of 5′‐aryl‐substituted 2,5‐bis(3′‐hexylthiophen‐2′‐yl)thiazolo[5,4‐d]thiazole derivatives was synthesized and these expanded semiconductors were investigated as active materials for solution‐processable organic field‐effect transistors. Field‐effect mobilities of up to 10−3 cm2 V−1 s−1 were obtained,…
The combination of quasi-static and electromagnetic pulse forming increases the formability of sheet metal forming processes. A cooperation between the institute of Applied Mechanics (IFAM) of the RWTH Aachen and the Institute of Forming Technology and Lightweight Construction (IUL) of the TU Dortmund is investigating…
Here we report the application of solid dispersion (SD) technique to improve paclitaxel (PTX) release from poly(ϵ-caprolactone) (PCL)-based film. Paclitaxel solid dispersions (SDs) with either poloxamer188 (PXM) or polyethylene glycol (PEG) were successfully prepared by a melting method and then incorporated into PCL…
Photocatalytic water splitting by semiconductor photocatalysts has attracted considerable attention in the past few decades. In this experiment, nanosized titanium dioxide (nano-TiO 2 ) particles are used to photocatalytically split water, which is then monitored by an oxygen sensor. Sacrificial reagents such as organ…