Materials Literature
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'QUADOS', a Concerted Action of the European Commission, has run an intercomparison aimed at evaluating the use of computational codes for dosimetry in radiation protection and medical physics. This intercomparison was open to all users of Monte Carlo, analytic and semi-analytic codes or deterministic methods. Its mai…
Twisted nematic liquid crystal display (TN-LCD) devices, composed of nematic liquid crystal (NLC), doped with silver (Ag) nanoparticles, which are protected with the same NLC molecules of 5CB (Merck, K-15), show electrooptic characteristics that are featured by a frequency modulation and fast response. This device is…
Abstract Sulfated zirconia powders have been prepared by following a single‐step sol–gel preparative route using zirconium propoxide as the starting compound. Sulfuric acid was employed both as the sulfating agent and as the catalyst of the polycondensation reaction in the gel formation. Three different series of prec…
Abstract The anionic polymerization of ethoxyethyl glycidyl ether (EEGE) initiated by cesium alkoxide was studied. The ring‐opening polymerization of EEGE in the presence of cesium alkoxide of 1‐methoxy‐2‐ethanol does not involve any side reactions. The presence of an additional alcohol leads to a significant increase…
Abstract Thin film depositions of metallic silver were performed using metal–organic (MO) CVD on glass substrates using, as precursors, the two new compounds (1,1,1,5,5,5‐hexafluoro‐2,4‐pentanedionato)(2,2′‐bipyridine)silver( I ), [Ag(hfac)(bipy)] ( 1 ), and (1,1,1,5,5,5‐hexafluoro‐2,4‐pentanedionato)( N , N , N ′, N…
Abstract In this communication we present the first stable zwitterionic spirocyclic Meisenheimer compound based on an N→N rearrangement in the reaction between picric acid and diisopropylcarbodiimide. The structure was confirmed by single‐crystal X‐ray diffraction. Furthermore, this compound exhibits interesting fluor…
The pore size of mesoporous silica membranes is reduced using pyridine‐catalyzed SiO 2 ALD within the mesoporous matrix. The use of pyridine to catalyze the ALD results in lowering the reaction temperature to 80 °C. It also self‐limits the pore size reduction as shown in gas permeation experiments. The self‐limiting a…
Twisted nematic liquid crystal display (TN-LCD) devices, composed of nematic liquid crystal (NLC), doped with palladium (Pd) nanoparticles, which are protected with the same NLC molecules of 5CB (Merck, K-15), show electrooptic characteristics that are featured by a frequency modulation and fast response. This device…
Abstract The corrosion and passivation behaviour of molybdenum thin films obtained by Physical Vapor Deposition (PVD) was investigated in aerated chloride and sulfate solutions at different pH values. Open circuit potential (ocp) measurements, polarisation experiments and electrochemical impedance spectroscopy (EIS) w…
Abstract A series of CeMn composites with different compositions was prepared by co‐precipitation. All samples were characterized by x‐ray diffraction (XRD), x‐ray photoelectron spectroscopy (XPS), energy dispersive spectroscopy (EDS) and transmission electron microscopy (TEM). According to their size and chemical co…
A series of multiporphyrin arrays has been studied to probe the contribution of energy transfer between second-neighbor (“nonadjacent”) porphyrins and to determine the rate of energy transfer between identical porphyrins at adjacent sites. The arrays, organized in linear or branched architectures, contain up to 21 con…
Three new stable bialkalimetallic alanates are predicted by accurate density functional calculations: K 2 LiAlH 6 , K 2 NaAlH 6 , and KNa 2 AlH 6 . Their detailed crystal structure has been determined by a systematic search through a large part of the probable space of crystal structures. They are thermodynamically st…
Time-resolved space charge (SC) and electroluminescence (EL) measurements are carried out on polyethylene films stressed under ac voltage at industrial frequency to probe injection, trapping and recombination of charge. SC is measured by pulsed electro-acoustic (PEA) technique at each zero voltage cross-over point of…
Abstract The tensile deformation behaviour of poly(1‐butene) and two of its ethylene copoloymers was studied at room temperature. This was done by investigating true stress‐strain curves at constant strain rates, elastic recovery and stress relaxation properties and in‐situ WAXS patterns during the deformation process…
Li-air battery (LAB), the energy-storage technology with highest theoretical energy density, is still seriously challenged by poor energy efficiency and limited durability though plenty of progresses have been made. In this work, we demonstrate that high performance LAB operated in N2-O2 (78:22) atmosphere could be ac…
The routine method of monitoring Zircaloy cladding corrosion in nuclear fuel pools is based on eddy current (EC) measurements at a single high frequency in the range of 1-3 MHz. At this frequency the rf wave does not penetrate through the cladding wall and, ideally, the EC response can be correlated to the thickness o…
Extended abstract of a paper presented at Microscopy and Microanalysis 2004 in Savannah, Georgia, USA, August 1–5, 2004.
Investigation of the thermoluminescence (TL) properties depending on the temperature, UV irradiation dose, and activator ion concentration in Lu 2 SiO 5 :Ce 3+ (LSO:Ce) crystals and measurements of the decay of recombination radiation during photostimulated release of the excitation energy accumulated in these crystal…
(La 0.8 Sr 0.2 ) 0.98 Fe 0.98 Cu 0.02 O 3−δ can be sintered directly onto YSZ (without the need for a protective ceria interlayer). Though subject to an extended “burn‐in” period (∼200 h), anode‐supported YSZ cells using the Cu‐doped LSF achieve power densities ranging from 1.3 to 1.7 W/cm 2 at 750°C and 0.7 V. These…
In order to safeguard the silicon vertex tracker in the BABAR detector from excessive radiation damage, cumulative dose and instantaneous dose rates are continuously monitored. As an upgrade to the current radiation monitoring system, which uses silicon p-i-n diodes, we are examining the possible use of single-crystal…