1,764 research outputs found
Synthesis, Curing, and Decomposition of Allylamine-Adducted 3,3’-Bismaleimidodiphenylsuhphone Resins
No full textThermodynamic assessment of the KF-ThF<sub>4</sub>, LiF-KF-ThF<sub>4</sub> and NaF-KF-ThF<sub>4</sub> systems
No full textA thermodynamic assessment of the KF-ThF4 binary system using the CALPHAD method is presented, where the liquid solution is described by the modified quasichemical formalism in the quadruplet approximation. The optimization of the phase diagram is based on experimental data reported in the literature and newly measured X-ray diffraction and differential scanning calorimetry data, which have allowed to solve discrepancies between past assessments. The low temperature heat capacity of α-K2ThF6 has also been measured using thermal relaxation calorimetry; from these data the heat capacity and standard entropy values have been derived at 298.15 K: Cp,mo(K2ThF6,cr,298.15K)=(193.2±3.9) J·K-1·mol-1 and Smo(K2ThF6,cr,298.15K)=(256.9±4.8) J·K-1·mol-1. Taking existing assessments of the relevant binaries, the new optimization is extrapolated to the ternary systems LiF-KF-ThF4 and NaF-KF-ThF4 using an asymmetric Kohler/Toop formalism. The standard enthalpy of formation and standard entropy of KNaThF6 are re-calculated from published e.m.f data, and included in the assessment of the ternary system. A calculated projection of the NaF-KF-ThF4 system at 300 K and the optimized liquidus projections of both systems are compared to published phase equilibrium data at room temperature and along the LiF-LiThF5 and NaF-KThF5 pseudobinaries, with good agreement.RST/Reactor Physics and Nuclear Material
Synthesis, properties, and field effect transistor characteristics of new thiophene-[1,2,5]thiadiazolo[3,4-g] quinoxaline-thiophene-based conjugated polymers
No full textNew Fluorene-Pyrazino[2,3-g]quinoxaline-Conjugated Copolymers: Synthesis, Optoelectronic Properties, and Electroluminescence Characteristics
No full textMicro-arc oxidization of a novel Mg-1Ca alloy in three alkaline KF electrolytes: Corrosion resistance and cytotoxicity
No full textA newly-developed Mg-1Ca (wt%) alloy was treated by micro-arc oxidization (MAO) in KF-silicate- (Si coating), KF-phosphate- (P coating) and KF-silicate-phosphate (SiP coating) electrolytes. The microstructure, composition and corrosion resistance of the resultant MAO coatings were investigated using scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and X-ray diffractometry (XRD). Electrochemical analysis and immersion test in Hanks' solution and MU assay for in-vitro toxicity against MG63 cells were subsequently carried out. Results showed that all the three MAO coatings contributed to the improvement of corrosion resistance and cytocompatibility of substrate; however, P coating outperformed the two others due to its specific microstructure and composition. (C) 2013 Elsevier B.V. All rights reserved.http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000330208500143&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701Chemistry, PhysicalMaterials Science, Coatings & FilmsPhysics, AppliedPhysics, Condensed MatterSCI(E)[email protected]
Surface redox-mediated dihydronicotinamide adenine dinucleotide probes based on ionic liquids covalently bound with catechol functionality
No full text[[abstract]]A novel imidazolium-based ionic liquid (IL), covalently bound to catechol (CA) groups by carbodiimide-mediated coupling reactions, was synthesized and used as the electrochemical sensing probe for dihydronicotinamide adenine dinucleotide (NADH). The thin layer of the CA-functionalized IL (IL-CA) at the screen-printed carbon electrode (SPCE) exhibited a stable redox couple originating from the catechol/quinone at the terminus. The redox-active film-modified electrode exhibited high and persistent electrocatalytic activity at 0.32V for the oxidation of NADH in pH 7.0 buffer solutions, while the oxidation reaction occurred at 0.75V at the bare electrode. Moreover, the modified electrode also showed free of interference from ascorbic acid (AA) and uric acid (UA). Flow-injection amperometry was performed for 1-1000 mu M of NADH under optimized conditions, and a linear calibration plot with a slope of 0.0078 mu A/mu M was obtained. The detection limit (S/N = 3) was 0.4 mu M. (C) 2012 Elsevier Ltd. All rights reserved.[[note]]SC
Macrolactonization of methyl 15-hydroxypentadecanoate to cyclopentadecanolide using KF-La/γ-Al(2)O(3) catalyst
No full textIt has been a challenge to synthesize macrolide musk in excellent yields with high purity. KF-La/γ-Al(2)O(3) catalyst was prepared from a highly basic mesoporous framework using a mild method. The prepared KF-La/γ-Al(2)O(3) catalyst was employed for the synthesis of cyclopentadecanolide from methyl 15-hydroxypentadecanoate. The morphology and structure of prepared catalysts were characterized using XRD, TG-DTG, SEM, EDX, TEM, BET and CO(2)-TPD. The results revealed that the K(3)AlF(6) and LaOF are produced on the surface of KF-La/γ-Al(2)O(3), and LaO can promote the dispersion of KF on the surface of Al(2)O(3). Catalysts pore size main distribution ranges between 10 and 30 nm, the maximum CO(2) desorption temperature is 715°C when the La loading is 25%. Because F(−) ion has a higher electronegativity than O(2−) ion, the KF-promoted metal oxide (Al(2)O(3) or/and La(2)O(3)) contained more strong basic sites, compared with that of the corresponding metal oxide. The yield of cyclopentadecanolide obtained at 0.5 g KF-25La/γ-Al(2)O(3) catalyst and a reaction temperature of 190°C for 7 h were 58.50%, and the content after reactive distillation is 98.8%. The KF-La/γ-Al(2)O(3) catalyst has a larger pore size and basic strength, which is more conducive to the macrolactonization of long-chain hydroxy ester
Troglitazone suppresses transforming growth factor beta-mediated fibrogenesis in retinal pigment epithelial cells.
No full text
General study on piezoelectric transformer
No full textAuthor name used in this publication: Cheng K. W. E.Author name used in this publication: Kwok K. W.Power Electronics Research Center, Department of Electrical EngineeringAuthor name used in this publication: Chan H.Refereed conference paper2004-2005 > Academic research: refereed > Refereed conference paperVersion of RecordPublishedPublisher permissio
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