Materials Literature
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The kinetic−probability approach taking into account first shell substitution effects (FSSE) is applied to hyperbranched condensation polymerizations. Simple explicit relationships giving the mass-average molar mass ( ) and mass-average degree of polymerization ( ) as a function of conversion, of initial monomer mixtu…
The molecular interactions between the glutamine binding-protein (GlnBP) from Escherichia coli and its main ligands the L-glutamine (Gln) and the gliadin, a toxic peptide containing three Gln sequences, are detected by means of an optical biosensor based on porous silicon (PSi) technology. The binding events are optic…
N,N '-Dialkylimidazolium ionic liquids (ILs) show promise as non-derivatizing 'green' solvents for the dissolution and processing of cellulose. To better understand how these ILs solvate this and other, polysaccharides at the molecular level, we have performed molecular dynamics (MD) simulations of neat l- n -butyl-3-…
Abstract The use of pulsed discharges for diamond deposition has been demonstrated to ensure a better control of heat transfer from the plasma to the walls in microwave plasma reactors. It also favours the production of CH 3 species while keeping constant or higher the H‐atom density. Higher growth rates can then be o…
Abstract Blends of thermotropic liquid crystalline polymer (LCPA‐950), based on a copolyester of hydroxynapthoic acid and hydroxybenzoic acid with an engineering thermoplastic, poly(phenylene sulfide) (PPS), were prepared using a corotating twin‐screw extruder. Addition of a third component, a functionalized polypropy…
One of the key technologies for next generation space telescopes requiring large-scale reflectors are light-weight materials having high specific strength, high specific stiffness, low coefficient of thermal expansion and high coefficient of thermal conductivity. Several candidates, such as fused silica, beryllium, si…
Spectroscopic ellipsometry is used to determine the complex refractive index ( n −i k ), porosity, and thickness of porous silicon (PSi) films. These films are obtained by anodizing p-type crystalline silicon in a hydrofluoric acid bath. After etching, PSi samples are heated to 750 °C in a controlled oxygen environmen…
In this study, we propose a process to prepare Mn–Zn ferrite powder, using oxides of manganese and zinc extracted from used dry batteries, and ferrous chloride solution from waste steel pickling liquor. The hydrothermal process was used to convert the starting raw materials into Mn–Zn ferrite powder. This powder revea…
We report here on the elaboration and transport properties of assemblies of ZnO nanoparticles and nanorods synthesized by organometallic chemistry. Two different methods have been used to prepare the samples. The first one consists in the deposition of the nano-objects on the substrate (drop-casting method) whereas th…
Abstract Am Institut für Werkstoff‐Forschung des Deutschen Zentrums für Luft‐ und Raumfahrt (DLR) wurde der oxidkeramische Faserverbundwerkstoff WHIPOX® ( W ound Hi ghly P orous Ox ide Ceramic Matrix Composite) bis zur Bauteilreife entwickelt. Neben den Anwendungen in Fluggasturbinen, Wiedereintrittsfahrzeugen und bei…
Abstract Suitable deposition conditions yielding to thin zinc oxide (ZnO) films with inclined c ‐axis have been determined in this work. These films were deposited on silicon (100) and on the nucleation side of self‐standing diamond substrates. We used r.f. magnetron and a zinc‐oxyde target. We characterized by X‐ray…
Cobalt nanowire arrays were fabricated by ac (continuous and pulse) electrodeposition into anodic aluminium oxide templates. The effects of continuous electrodeposition waveform and frequency as well as the pulse feature on the structure and magnetic properties of the nanowire arrays were studied. For continuous elect…
Conjugated Polyelectrolytes (CPs) have been successfully used as highly sensitive materials in chemo and biosensors for many years. But in general CPs were not very successful as a light emitting layer in polymer light-emitting diodes (PLEDs). Until recently, it was found that polyfluorene-based CPs and their precurso…
Poly-(Azure A) films deposited on indium−tin oxide electrodes were simultaneously characterized by visible/near-infrared spectroscopy and EIS techniques at different polarization potentials and pH. The instantaneous variation of the absorbance with the potential (d A /d E ) at 685 and 875 nm was correlated with the ki…
Abstract In comparison with polycrystalline diamond, single crystal diamond (SC CVD) offers important advantages for applications to electronics and detection. This is because SC CVD diamond exhibits improved charge transport characteristics, specifically a high drift mobility and an increased charge carrier lifetime.…
The master Gd5Si1.8Ge1.8Sn0.4 MCE alloy was prepared by the arc-melt method. The alloy was re-melted and melt-spun by single-roller melt spinning at different copper wheel speeds. Temperature-dependent x-ray diffraction (XRD) and magnetic measurement confirm the first-order magnetic–crystallographic transition of as-c…
Abstract Detailed statistical trend analysis of thermoplastic elastomers based on poly (phenylene ether) (PPE), polystyrene (PS), ethylene vinyl acetate (EVA) and styrene‐ethylene‐butylene‐styrene (SEBS) was done through Design Expert software by Stat‐Ease. D optimal crossed design was followed to capture the interact…
The preparation process of zinc aluminate (ZnAl 2 O 4 ) ceramic powder, as well as the sintering temperature have been consequently governed using scanning electron microscopy (SEM) and x-ray diffraction (XRD) techniques. A broad exothermic peak in the range 223–310 °C is observed due to the crystallization of ZnAl 2…
The thermal spin transition that occurs in the polymeric chain compound [Fe(NH(2)trz)3](NO3)2 above room temperature has been investigated by zero-field muon spin relaxation (microSR) over the temperature range approximately 8-402 K. The depolarization curves are best described by a Lorentzian and a Gaussian line that…
Transient photo-induced voltage characteristics have been studied in La0.9Sr0.1MnO3 films on vicinal cut SrTiO3 (0 0 1) substrates. The as-received thin films are epitaxially grown on the substrates and predominated by a single ( 1 01)-oriented growth. Under irradiation of a 308 nm laser pulse the voltage signal is pu…