Materials Literature
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The fields of tissue engineering and regenerative medicine aim at promoting the regeneration of tissues or replacing failing or malfunctioning organs, by means of combining a scaffold/support material, adequate cells and bioactive molecules. Different materials have been proposed to be used as both three-dimensional p…
Characterization by X-rays diffraction of Tim Mersoï basin (North Niger) analcimolites . Natural zeolite samples from northern Niger were studied by X-ray diffraction (XRD). The obtained results, completed with scanning electron microscopy/energy dispersive X-ray microanalysis spectrometry (SEM/EDAX) revealed the pres…
Abstract SrPbO 3– δ is n‐type, narrow‐bandgap semiconductor crystallizing in a distorted perovskite structure. The electrical conductivity varies with temperature but in a nonmonotonic manner. At high temperatures, the thermal evolution of the conductivity follows an Arrhenius‐type law with an activation energy of 0.1…
Starting from the well known stable free radical 2,2-diphenyl-1-picrylhydrazyl (DPPH; 2a) and its congener 2,2-diphenyl-1-(4-cyano-2,6-dinitrophenyl)hydrazyl 2b, or from their reduced hydrazine counterparts 1a,b, it was possible to obtain the p-quinonoid compounds 4a,b by oxidation with ceric (Ce4+) sulfate, which by…
Abstract Silicon nanoparticles were dispersed for 24 hours in 1‐butanol using a stirred media mill. Via this process intrinsically stable suspensions (in regard to aggregation) of Si nanoparticles were produced after 6 hours of dispersing. The evolution of morphology, particle size and structure was investigated by dy…
The authors report a field emitter structure based on oxide coated carbon nanotubes (CNTs). This emitter consists of a thin tungsten ribbon with CNTs on the surface and a thin layer of low work function barium strontium oxide coating on the CNTs. This oxide coated CNT emitter was designed to combine the benefits of th…
Large-scale ZnO nanowire arrays with honeycomb-like micropatterns have been synthesized by a surfactant assisted soft chemical approach. Sol–gel-derived ZnO thin film with crystallographic orientation along the c axis was used as a substrate for the growth of ZnO nanowires. The micropatterned arrays of ZnO nanowires a…
Abstract A simple approach for one‐pot, one‐step binary mixed homopolymer brush synthesis was devised by combining nitroxide‐mediated radical polymerization of styrene and living cationic ring‐opening polymerization of 2‐phenyl‐2‐oxazoline. Surface characterization techniques such as ATR‐FTIR, ellipsometry, XPS, and c…
Ge nanocrystals of different sizes and densities have been grown on p-Si(100) substrates by radio-frequency magnetron sputtering. We have also synthesized Ge nanocrystals embedded in a SiO 2 matrix, using a suitable target, followed by post-deposition annealing at 900 °C in a N 2 atmosphere. Atomic force and transmiss…
Abstract The morphology and nonisothermal crystallization behavior of blends made of poly(phenylene sulfide) (PPS), with a amorphous polycarbonate (PC) were studied. The blend is found to be partially miscible by the dynamic mechanical thermal analysis (DMTA) and melt rheological measurements. The nonisothermal crysta…
Abstract The high‐density polyethylene/carbon black (HDPE/CB) composite with a CB volume fraction of 0.113 is isothermally annealed at various temperatures from 116 to 149°C, covering the positive temperature coefficient (PTC) transition and the negative temperature coefficient regions during heating as well as from 1…
Ferrite/ferroelectric films are of interest as they afford dual tunability of the permeability and permittivity using magnetic and electric fields. We have grown bilayered thin films of ferrimagnetic BaFe12O19 (BaM) and ferroelectric Ba0.5Sr0.5TiO3 (BST) on A-oriented polished sapphire substrates using pulsed laser de…
Recombination dynamics of excitons in Mg0.11Zn0.89O epilayers grown by laser-assisted molecular-beam epitaxy on a ScAlMgO4 substrate were investigated. By using the MgZnO high-temperature-annealed self-buffer layer (HITAB), the value of full width at half maximum of the near-band-edge (NBE) photoluminescence (PL) peak…
Microphotoluminescence (μ-PL) of high-aspect-ratio Si nanopillars fabricated by etching Ni-nanodot∕SiO2 masked Si substrate is investigated. The 320-nm-tall Si nanopillars obtained by CF4∕Ar mixed inductively coupled-plasma reactive ion etching process with density of 2.8×1010cm−2 further shrink size from 30to6nm by o…
Abstract Cobalt‐substituted lithium ferrites (with general composition Li 0.5– x /2 Co x Fe 2.5– x /2 O 4 , where x = 0.0, 0.2, 0.4, 0.5 and 0.6) were prepared at lower processing temperatures (∼600 °C) by the citrate route. The single‐phase spinel structure was confirmed by X‐ray diffraction. The average particle siz…
Abstract Poly(2‐hydroxyethyl methacrylate)‐ block ‐poly( N ‐isopropylacrylamide) (PHEMA‐ b ‐PNIPAM) was prepared by controlled surface‐initiated ATRP from silicon substrates, and the resulting block copolymers were successfully converted into the corresponding PSEMA‐ b ‐PNIPAM by esterification of the hydroxy groups o…
A fundamental understanding of the role of catalysts in improving the kinetics and thermodynamics of hydrogen sorption in NaAlH4 is the key for using this material in hydrogen storage. The authors present a systematic theoretical study of energies needed to desorb hydrogen in 3d transition metal (Sc–Cu)-doped NaAlH4.…
Abstract Homogeneous surface coating of multi‐walled carbon nanotubes is achieved for the first time by in situ copolymerization of ethylene (E) and 2‐norbornene (N) as catalyzed directly from the nanotube surface previously treated by a highly active metallocene‐based complex, i.e., rac ‐Et(Ind) 2 ZrCl 2 /MMAO‐3A. Th…
The authors investigate the magnetic and transport behaviors of Ge1−xMnxTe thin films with high Mn composition (x=0.98) grown by solid-source molecular-beam epitaxy. The temperature-dependent magnetization (M-T) gives a Curie paramagnetic temperature θp∼120K, in contrast to the Curie temperature of TC∼95K obtained fro…
We study the band structures of one-dimensional (1D) photonic crystals (PCs) in the subwavelength limit. A "spatial-averaged single-negative" (SASN) gap whose edges correspond to zero (volume) averaged permittivity (epsilon=0) and zero (volume) averaged permeability (micro=0) will appear when metamaterial is included…