Materials Literature
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Quasiperiodic sequences of the maxima of microwave absorption with decreasing amplitudes have been observed in a temperature range of 4–50 K in the electron spin resonance spectra of ferrimagnetic chiral single crystals [Mn{(R/S)-pn}] 2 [Mn{(R/S)-pn} 2 (H 2 O)][Cr(CN) 6 ] 2 , as well as [Cr(CN) 6 ][Mn(S)-pnH-(H 2 O)]H…
Article Factors Influencing the Structure and Properties of Nanocomposites Derived by Sol-Gel Technique was published on December 1, 2006 in the journal Journal of Polymer Engineering (volume 26, issue 8-9).
During the phase-change process of Ge2Sb2Te5in PRAM (Phase--hange Random Access Memory), phase-change dynamics are strongly dependent on the quenching speed, i.e. the cooling speed of melted phase--change material. Here we report the relation between quenching speed of programming pulse and phases of Ge2Sb2Te5in phase…
A cinética de vulcanização de misturas envolvendo borracha natural (NR) e copolímero de etileno-propileno-dieno (EPDM) na proporção 70:30 % em peso foi estudada em função da compatibilização. Para esse estudo foram utilizados 2,5 phr de EPDM funcionalizado com grupos tioacetato (EPDMTA) ou mercaptana (EPDMSH). O estud…
Y 2 O 3 :Eu phosphor particles with a spherical shape, a fine size, and high brightness under vacuum ultraviolet (VUV) illumination were prepared by spray pyrolysis. The polymeric precursors were needed to modify the spray solution to prepare spherical particles. The use of only flux with the polymeric precursors did…
In this study a two-step strategy was adopted to cultivate Polyhydroxybutyrate (PHB)-rich aerobic granular sludge in a sequencing batch reactor (SBR) fed with a synthetic wastewater. In the first step both oxygen and ammonia were initially limited, in order to enhance the PHB-storage ability of sludge. In the second s…
O principal objetivo deste trabalho é caracterizar argilas esmectíticas "Chocolate" de Boa-Vista, PB, tanto na sua forma natural quanto tratada quimicamente, visando sua aplicação em catálise. As argilas foram caracterizadas por fluorescência de raios X, difração de raios X e espectrofotometria de absorção óptica na r…
Abstract New dinuclear and tetranuclear vanadium(III) complexes with sulfato bridge(s), [{VIII(H2O)}2(μ-hpnbpda)(μ-OH)(μ-SO4)]·5.25H2O (1) and [VIII4(μ-hpnbpda)2(μ-OH)2(μ-SO4)2]·12H2O (2), where hpnbpda is an alkoxo-bridging dinucleating ligand, 2-oxo-N,N′-bis(2-pyridylmethyl)-1,3-propanediamine-N,N′-diacetate, were p…
Full characterization, that is the true molar mass distribution and block sequence, of a multiblock copolymer based on poly(2,6-dimethyl-1,4-phenylene oxide) (PPO) and poly(bisphenol A carbonate) (PC) segments (PPO- b -PC), synthesized by polycondensation reaction of both diol-terminated PPO and PC samples with the bi…
Nous avons affine la structure cristalline de la senkevichite, de composition ideale Cs K Na Ca 2 T1 4+ O [Si 7 O 18 (OH)], triclinique, PI, a 10.4191(4), b 12.2408(5), c 7.0569(3) A, a 90.857(1), β 99.193(1). γ 91.895(1)°, V 887.8(1) A 3 , Z= 2. D calc 3.125 g/cm 3 , provenant du complexe de Dara-i-Pioz, dans les mon…
Abstract The structure and mechanical properties of injection‐molded bars of high‐density polyethylene (HDPE)/PA6 blends were studied in this article. The experimental results showed that the morphologies of injection‐molded bars change gradually along the flow direction, which is tightly related to the melt viscosity…
This study establishes the feasibility of fabricating twist nematic gratings (TN-gratings) using a polarization holographic approach on the basis of the laser-induced adsorption of azo dyes by a polymer-coated glass substrate. This holographic recording is fast, and the formed TN gratings are permanent. Measurements i…
Abstract Nano TiO 2 particles encapsulated in mesoporous SiO 2 materials (abbreviated as TiO 2 /MS) were prepared by incorporating the nano‐sized TiO 2 particles in the pore‐directing micelles during the cooperative assembly of silica precursor and surfactant. The materials were characterized with X‐ray powder diffrac…
New complex phosphates of titanium, iron, and alkaline-earth metals have been synthesized. X-ray powder diffraction, differential thermal analysis (DTA), and IR spectroscopy are used to study phase formation in the series of M0.5(1+x)FexTi2−x (PO4)3 (M = Mg, Ca, Sr, Ba) phosphates. Individual compounds and solid solut…
A complex disordered system composed of composite material and mesoscopic pore arrays was developed by depositing CoAlO composite thin films on the multiporous anodic aluminum oxide (AAO) membranes. In the disordered antidot arrays, self-connectivity of the metallic phase was dependent on the local conduction geometri…
A new method for the contactless measurement of the electrical conductivity σ of high temperature aerodynamically levitated materials is presented. The apparatus, based on an oscillating coil system, improves considerably on previously reported static coil techniques by eliminating the large errors introduced by tempe…
Among the plethora of polymers being exploited and employed currently for biomedical applications, polypyrrole as a conducting polymer holds a key position since it offers several advantages including good specific conductivity, chemical stability, polymerizability and compatibility with mammalian cells; however, it a…
Crystallization and morphological features of syndiotactic/atactic polystyrene (sPS/aPS) mixtures with a constant weight ratio of 5/5 but different weight-average molecular weights (MW) of aPS, i.e., 1880K (aPS-U), 100K (aPS-H), 4.3K (aPS-M), and 1.3K (aPS-L), have been investigated. For these athermal blends cold-cry…
The conducting and reflecting properties of silver, gold, nickel, iron, chromium, and titanium films are investigated. It is shown that a low conductivity of films relative to bulk materials results from the amorphism of the films and the porosity of their substrates. Two different techniques for measuring the film co…
A methoxy poly(ethylene glycol) (MePEG)-conjugated linoleic acid (CLA) polymeric conjugate is synthesized with the use of dicyclohexycarbodiimide and 4-dimethylaminopyridine as the coupling agent and the catalyst, respectively. Self-assembled MePEG-CLA conjugate micelles are prepared by dialysis in water. Fluorescence…