Materials Literature
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The anodic release of carbon dioxide gas in the molten salt Hall-Heroult process can be used to power a turbine for electricity generation. The application of this new concept in molten salt reprocessing in the nuclear industry is considered because it could facilitate the suitability of carbon dioxide cycles to certa…
GaN light emitting diodes (LEDs) on sapphire substrates can be improved by micro-patterning substrate to perform epitaxial over-growth which drastically reduces defects' density in the light emitting region. We patterned Al<sub>2</sub>O<sub>3</sub> with focused ion beam and show a successful overgrowth of GaN. The exa…
This study focuses on the genus Brachysira Kützing from lowland waters as part of the diatom flora investigation of Colombia. Periphyton samples were collected in lentic and lotic waterbodies from different Amazonian basins and the Ayapel swamp system in the northern Atlantic plain of Colombia. Diatoms were analysed w…
In this work we review our current understanding of structure, stability and formation of icosahedral quasicrystals and approximants. The work has special emphasis on Cd–Yb type phases, but several concepts are generalized to other families of icosahedral quasicrystals and approximants. The paper handles topics such a…
Niobium aluminum carbide ( Nb 4 AlC 3 ), as a member of the MAX phases, can retain its stiffness and strength up to over 1400°C. However, its applications are limited due to its poor oxidation resistance at high temperatures. In this work, silicon pack cementation has been applied to improve the oxidation resistance o…
Structural evolution and crystallization behavior between 600°C and 1450°C during the preparation of bulk SiC / B 4 C / C nanocomposites by the pyrolysis of CB ‐ PSA preceramic were investigated. The CB ‐ PSA preceramic converts into carbon‐rich Si – B – C ceramics up to 800°C. Structural evolution and crystallization…
The effects of alginate concentration and drying temperature on drying kinetics/characteristics of alginate solution and mechanical property of formed solid films were examined. Solid films were fabricated through thin-layer drying of 1 to 4%w/w sodium alginate solution at 40, 60, and 80°C using the solvent-evaporatio…
The paper presents analytical data obtained by directly measuring samples taken at different levels of a hexagonal fuel assembly duct used in the BN-350 fast reactor. The difference between the length of the deflection arc and the width of an intact duct face displays the accumulated irradiation-creep deformation duri…
ABSTRACT Nanoimprint lithography is used to create large‐area two‐dimensional prepatterns with tunable topographic heights in a resist layer. The resist prepatterns are applied to direct the self‐assembly of sphere‐forming polystyrene‐ block ‐polydimethylsiloxane block copolymers so as to form sparse nonregular nanodo…
A facile route was used to modify Al particle surfaces by putting Al particles into an Al ( OH ) 3 suspension, which was produced by the reaction of Al powder with water under vacuum at a mild temperature, then drying and heat‐treating under vacuum at elevated temperature. The modified Al powder has a good reaction ac…
The dry sliding wear behavior of Mg-1.5Zn-0.15Gd alloy before and after cryogenic treatment was studied by wear tests using a ball-on-disk configuration at room temperature. The wear tests were performed at speeds ranging from 0.05 to 0.7 m/s under three different applied loads (5, 7, and 10 N). The worn surfaces and…
A very simple synthetic procedure was developed for the preparation of Ni-Sn alloy catalysts that were utilised for chemoselective hydrogenation of furfural, producing furfuryl alcohol almost exclusively. The mixture of nickel nanoparticles supported on aluminium hydroxide (R-Ni/AlOH) and a solution containing tin was…
Borosilicate glasses doped with PbO , ZnS , or PbS were fabricated to investigate the visible emissions (one located at 370 nm and another at 550 nm) observed in the PbO and ZnS codoped glass. Several series of glassy systems were designed to investigate the mechanism of above visible emissions. The absorption, photol…
ABSTRACT Amyloid structures constitute a class of highly ordered nanomaterials formed by insoluble protein aggregates. These aggregates are characterized by a cross‐β structural motif in which β‐sheets are oriented perpendicular to the fibril axis and bound together by a dense hydrogen bonding network. Although they h…
Mesoporous alumina (MA)was synthesized by sol–gel based evaporation‐induced self‐assembly process using aluminum isopropoxide as alumina source in the presence of three different types of triblock copolymers (TBCs), F68, F127, and L64. The role of different TBCs as surfactants on thermal, crystallization, textural, an…
Grain‐boundary character distributions ( GBCD s) were determined for spark plasma sintered Y ‐ and La ‐doped aluminas prepared at temperatures between 1450°C and 1600°C. La doping leads to grain boundaries that adopt (0001) orientations 3.7 times more frequently than expected in a random distribution, whereas the Y‐do…
The objective of the study was to evaluate the effect of chitosan coatings combined with zeolite on tomato (Lycopersicon sculentum cv. FA-180 HAZERA) quality attributes during refrigerated storage. Coatings were applied by double immersion of fruits in the film-forming solutions for 5 min, depending on treatments: (i)…
The dielectric and ferroelectric characteristics of ( Sr x Ba 1− x ) Nb 2 O 6 unfilled tungsten bronze ceramics have been investigated together with the structure. The dielectric and ferroelectric characteristics of the present ceramics vary significantly with x , and the A1/A2‐sites occupancy has been determined as t…
A series of compositions with general stoichiometry Ca 1− x Zr 1− x Nd 2 x Ti 2 O 7 has been prepared by high‐temperature solid‐state reaction of component oxides and characterized by powder X ‐ray diffraction and electron probe for microanalyses ( EPMA ). The phase fields in CaZrTi 2 O 7 – Nd 2 Ti 2 O 7 system and di…
Bare copper sheet and three commercial Cu-based alloys, Cu15Zn, Cu4Sn and Cu5Al5Zn, have been exposed to four test sites in Brest, France, with strongly varying chloride deposition rates. The corrosion rates of all four materials decrease continuously with distance from the coast, i.e. with decreasing chloride load, a…