Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Quantum yields for multichannel transition emissions have been determined in a Eu 3+ -doped heavy metal tellurite glass under the pumping of a violet light emitting diode (LED) for the first time. To achieve this goal, the necessary fluorescence spectra were measured and calibrated in an integrating sphere, which was…
"Smart Coatings" represent the state-of-the-art of coatings technology. This technology has evolved through three principal stages. In the first, an ingredient with valuable properties is added to a coatings formulation, and all the unique properties of the coating are attributable to this additive. In the second, a s…
Abstract In two specifically constructed rigid, proximate, “face‐to‐face” benzo/pyridazino systems (shortest π,π distances ca. 3 Å) photoequilibration with the photo[6+6]cycloadducts has been established by 254‐nm irradiation (ratios ca. 2:1). The failure to observe such “benzene/heteroarene” photodimers for different…
Abstract Polystyrene (PS)‐encapsulated magnesium hydroxide (Mg(OH) 2 ) particles with various shell thicknesses were successfully prepared using a method of in situ polymerization of styrene in a high‐speed mixer. High‐impact polystyrene (HIPS)/Mg(OH) 2 composites were prepared by melt blending. They were characterize…
Abstract Y‐encapsulated Cu II –purine complexes were synthesized, characterized and studied in the catalytic oxidation of cyclohexene. Encapsulation was achieved by ion‐exchanging the complex from aqueous solutions containing both the purine ligand, 9‐methyl‐6‐(methylamino)purine, and copper, in different pH, with a p…
In this endeavour, near infrared spectroscopy studies show evidence of variable composition in aurichalcite minerals of zinc copper carbonate hydroxides. The observation of a broad feature in the electronic part of the spectrum around 11,500 cm −1 (870 nm) is a strong indication of Cu 2+ substitution for Zn 2+ in the…
NAVAIR-WD has successfully synthesized an electroactive polymer, poly(2,5-bis(N-methyl-N-hexylamino)phenylene vinylene), (BAM-PPV) in high yield and purity. BAM-PPV has also been characterized using advanced spectroscopic, electrochemical and thermal analysis techniques (NMR, FTIR, ENM, TMA, DSC and TGA) to determine…
Abstract A series of new liquid crystalline copolymers, poly[(( S )‐2‐methyl‐1‐butyl methacrylate)‐ co ‐(6‐(4‐(4‐cyanophenylazo)phenoxy)hexyl methacrylate)], with different contents of chiral units of 17, 36, 54 and 78 mol% were synthesized. The structures and properties of the copolymers were characterized and evalua…
The annealing behavior of poly[( R )-3-hydroxybutyrate- co -( R )-3-hydroxyvalerate] (P(3HB- co -3HV)) crystal was studied by synchrotron radiation small-angle X-ray scattering (SAXS) and wide-angle X-ray diffraction (WAXD). Solution-grown single crystals of P(3HB- co -3HV) with various composition of 3HV (5.3−16.0 mo…
Abstract The effect of microfillers on the thermal stability of natural rubber (NR), carboxylated styrene butadiene rubber (XSBR) latices, and their 70/30 NR/XSBR blend were studied using thermogravimetric method. Microcomposites of XSBR and their blend were found to be thermally more stable than unfilled samples. The…
We have explored the changes in the phase stability, orientational order, and dynamics of the nematic 4-cyano-4'-n-pentylbiphenyl (5CB) doped with either the trans or the cis form of different p-azobenzene derivatives using the ESR spin-probe technique. In particular, we have studied the effects induced by each of the…
International audience
Abstract This article describes a new approach for the recycling of microporous polyurethane elastomers by Tris(1‐methyl‐2‐chloroethyl) phosphate‐induced degradation. The phosphorus‐containing degradation products formed are transformed into reactive intermediates by reaction with propylene oxide and are used for the…
Abstract Surface modification treatments were performed on six different types of polymers using low temperature cascade arc torch (LTCAT) of Ar with or without adding reactive gas of O 2 or H 2 O vapor. The effects of the treatments on the wettability enhancement, surface degradation from oligomer formation, and surf…
This study examines the field-dependent hysteretic behavior of a magnetorheological (MR) fluid and its identification using a Preisach model. The field-dependent shear stress of a commercially available MR fluid is measured using a parallel disk rheometer, and its shear stress versus shear rate hysteretic behavior is…
Fuel cells having proton conducting membranes comprising doped barium cerate ceramic BaCe 0.85 Y 0.15 O 3- α (BCY15) as electrolyte and platinum as both anode and cathode electrodes performed well for conversion of ethane to ethylene at 650 and 700 °C. No deterioration in performance occurred during 20 days of operati…
The use of alkyl ammonium cations resulted in four compounds of (A)[FeIII(ox)Cl2] (A = Et3NH+ (1a, 1b), Me4N+ (2), and n-Bu4N+ (3); ox = oxalate), whose structures and magnetic properties were characterized. In all cases, the metal Fe(III) ions are six-coordinated by four oxygen atoms from two bischelating oxalate lig…
We have studied the electronic structure of Ta n +1 AlC n (space group P 6 3 / mmc , n = 1–3) under uniform compression from 0 to 60 GPa and at temperatures from 0 to 1500 K using ab initio calculations. These phases can be characterized by alternating layers of high and low electron density and are referred to as nan…
We have developed a fully three-dimensional model based on the solution of the time-dependent Schr\"odinger equation for studies of polaron mobility in twisted polymer chains. Variations in ring torsion angles along a conjugated polymer chain are shown to have a strong effect on the intrachain charge carrier mobility.…
D-Ribulose 1,5-bisphosphate carboxylase/oxygenase (RuBisCO), the most abundant enzyme, is the paradigm member of the recently recognized mechanistically diverse RuBisCO superfamily. The RuBisCO reaction is initiated by abstraction of the proton from C3 of the d-ribulose 1,5-bisphosphate substrate by a carbamate oxygen…