Materials Literature
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Directionally solidified B4C–SiC composites were prepared by a Floating Zone method. The lamellar texture was observed at 53 mol%SiC . The c-axis of B4C phase was tilted 20° to the growth direction. The (102) plane and [\\bar1\\bar21] direction of the B4C phase were parallel to the (311) plane and [12\\bar1] direction…
Research Article| January 01, 2002 Beryllium in Metamorphic Environments (emphasis on aluminous compositions) Edward S. Grew Edward S. Grew Department of Geological Sciences, University of Maine, 5790 Bryand Center, Orono, Maine 04469, esgrew@maine.edu Search for other works by this author on: GSW Google Scholar Revie…
Abstract The deformation mechanisms in polypropylene as a function of strain rate have been studied by scanning electron microscopy. Injection molded, dogbone specimens were tested in tension at a temperature of 50°C and strain rates from 10 −4 to 90 s −1 . With increasing strain rate a gradual transition from cold dr…
Highly dispersed uranium oxide nanocrystals supported on ordered mesoporous silica matrixes with large surface areas and porosities have been synthesized via a co-assembly methodology; the preliminary catalysis tests showed that these materials have a high catalytic activity for the thermal oxidation of volatile organ…
Supported lanthanum oxide catalysts were prepared by the impregnation method, using an aqueous solution of lanthanum nitrate hexahydrate (La(NO3)3·6H2O), then calcined at 920 K for 2 h. Characterization of the samples was carried out by X-ray diffraction, N2-adsorption at −196 °C and IR spectroscopy of the calcination…
The optical erasing of holographic gratings inscribed on azobenzene homopolymer thin films of p(DR1M) is analyzed for various polarizations of the erasing single beam. Gratings of different diffraction efficiencies are first inscribed using different states of the incident interfering beams, either linearly polarized…
Voltage shift phenomena of the hysteresis loop were characterized for a c-axis oriented heteroepitaxial BaTiO3 film by means of switching current measurements using various types of pulse sequences. During application of voltage, the hysteresis loop gradually shifted along the voltage axis according to the polarity of…
A new method of protein nucleation and crystallization based on Langmuir-Blodgett technology is here utilized for the template stimulation of crystal growth of so far non-crystallized proteins. Microcrystals (60-120 microm) of bovine cytochrome P450scc and human protein kinase CKII alpha subunit were obtained with use…
The influence of salt deposits on the atmospheric corrosion of zinc was studied in the laboratory. Four chloride-containing salts, NaCl, NH 4 Cl , ZnCl 2 , and MgCl 2 , and four sulfate-containing salts, Na 2 SO 4 , ( NH 4 ) 2 SO 4 , ZnSO 4 , and MgSO 4 , were investigated. The salts were applied by spraying a saturat…
Nitrogen-doped hydrogenated amorphous carbon, a C : H : N x films, were synthesized by microwave electron cyclotron resonance plasma-enhanced chemical vapor deposition, using N 2 / C 2 H 2 as precursors. Such films, with thickness in the range of a few tens of nanometers, very smooth, and pinhole free, appear as ele…
Abstract Multi-walled as well as single-walled carbon nanotubes are conveniently prepared by the pyrolysis of organometallic precursors, such as metallocenes and phthalocyanines, in a reducing atmosphere. Pyrolysis of organometallics alone or in mixture with hydrocarbons also yields aligned nanotube bundles with usefu…
Due to their unique expected properties thermoelectric microdevices, thermogenerators as well as Peltier coolers, are of high demand for different applications namely for telecommunication purposes. Thus worldwide efforts are undertaken to expand the technology for thermoelectric devices into the field of typical micr…
The aqueous polymerization of 3-hydroxyaniline (3HA) was studied using sodium dichromate as oxidant in presence of hydrochloric acid. The effect of hydrochloric acid, sodium dichromate and monomer concentration on the polymerization rate, specific viscosity of the obtained polymer and a.c.conductivity was investigated…
The CODATA Data Science Journal is a peer-reviewed, open access, electronic journal, publishing papers on the management, dissemination, use and reuse of research data and databases across all research domains, including science, technology, the humanities and the arts. The scope of the journal includes desc…
During the reaction injecting molding process of polyurethane−urea (PUU) based on 4,4‘-methylenebisphenyl diisocyanate (MDI), urethane as well as urea linkages are produced when a highly fluorescent aromatic diamine is used as a chain extender. To explore intrinsic fluorescence as a cure characterization technique, mo…
Photothermal deflection spectroscopy has been applied to optical absorption measurements in As2S3, Se, and As–S glasses. The spectroscopic method is demonstrated to be suitable for evaluation of small absorption in thin samples, while its accuracy is affected by light scattering. For As2S3, as-evaporated films give hi…
Poly[3-(3,4-difluorophenyl)thiophene], MPFPT, electrochemically deposited onto carbon paper, was studied in electrochemical capacitors utilizing several tetraalkylammonium/acetonitrile electrolyte systems. Although the surface morphology of the polymer varied with the anion used for polymerization, an open and porous…
Composite materials containing thin Shape Memory Alloy (SMA) wires show great promise as materials able to adapt their shape, thermal behaviour or vibrational properties during service. Tools for designing such materials are however far from being available. The work presented here reports the main achievements of a c…
It is well established that the second-phase particle (SPP) size distribution and the cladding chemical composition affects the in-reactor corrosion rate of boiling water reactor (BWR) cladding, although the mechanisms are not yet fully understood. To further study these effects, the corrosion and hydriding performanc…
Composite electrodes based on mixed valence oxide nanoparticles (Ox) embedded in an electrically conductive polymer (ECP) were investigated toward the oxygen reduction reaction (ORR). ECP was polypyrrole (PPy), and Ox was the spinel mixed valence oxide Cu 1.4 Mn 1.6 O 4 , which is known to be an electrocatalyst of the…