Materials Literature
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Silicon nanoparticles were prepared by off axis pulsed laser deposition (PLD) technique. The optical properties of Si nanoparticles grown on quartz substrate have been characterized by optical absorption, photoluminescence, Raman, and transmission electron microscopy. TEM has demonstrated that the radius of nanocrysta…
Plastics have become a major factor in modern life and the massive volume of plastics in use has a significant effect on the environment. Major efforts are underway to reduce the impact of plastics on the environment and to make them more eco-friendly. Such efforts include the use of bio-materials instead of nonrenewa…
Abstract Modification of thermoplastic and rubbery materials by electron beam (EB) radiation is a potential method for development of new polymers and composites. Irradiation of polymeric materials results in grafting and subsequently formation of a three dimensional network through the union of generated macro radica…
Molecular systems composed of peptides or proteins can be programmed to yield intriguing and potentially useful supra-molecular architectures. In the past decade peptide self-assemblies at interfaces have been the subject of various studies aiming at formation of molecular structures with predictable patterns and prop…
The effects of F doping on the structural and electronic properties of the (5, 5) single-walled boron nitride nanotube (BNNT) are investigated by using the density functional theory method. The chemiadsorption of F maintains the hexagonal BN network, increases the lattice constant, and introduces acceptor impurity sta…
Complex metal hydrides are considered as a class of candidate materials for hydrogen storage. Lithium-based complex hydrides including lithium alanates (LiAlH(4) and Li(3)AlH(6)) are among the most promising materials owing to its high hydrogen content. In the present work, we investigated dehydrogenation/rehydrogenat…
An effect of nano-scale TiN grains on the mechanical properties and microstructure of Si3N4 based ceramic tool materials is investigated at the different sintering temperature. Compared to monolithic Si3N4 ceramic tool materials, the sintering temperature is decreased and mechanical properties is enhanced when only on…
Abstract A series of well defined polyethylene‐b‐polystyrene diblock copolymers (E x S y z , where x and y represent the composition in weight % and z the molecular weight in Kg/mol) has been synthesized in a wide composition range by sequential anionic polymerization. The molecular weight of the PE block was kept con…
The microchemistry of Ti-carbonitrides in Alloy 600 (UNS N06600) was analyzed using transmission electron microscopy and scanning Auger electron spectroscopy. Pit initiation testing was conducted to clarify the preferential pitting sites of Alloy 600 in a deaerated 10,000-ppm chloride solution at 90°C. It was found th…
Basic data on leaching of magnesite (MgCO 3 ) with sulphuric acid are of interest from the point of view of the industrial process for obtaining pure MgSO 4 . The Taguchi method was used to determine the optimum conditions for the dissolution of magnesite in H 2 SO 4 solutions. The experiments were performed within th…
The total conductivity of the solid solutions (Ce 1−x Zr x )0.8Gd 0.2 O 1.9 and (Ce 1−x Zr x ) 0.8 Y 0.2 O 1.9 was measured in air as a function of temperature (T = 300 °C- 600 °C) and composition (x = 0.0 - 0.9). A deep minimum of the bulk ionic conductivity was found for equal fractions of ceria and zirconia. It ind…
The conventional ultimate performance test by applying a component in its true application (i.e., in an engine) is often very expensive and impractical when dealing with developmental materials. Simpler, less expensive, and more practical test methods must be utilized. The present work aims toward the applications of…
We report the observation of 1∕f noise in carbon nanotube field-effect transistors as a function of gate potential. In order to avoid additional low frequency noise contribution from SiO2-nanotube interactions, the measurements were carried out in conducting liquid. Based on the experimental results, we conclude that…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation Raghavendra Devendra, Savvas G. Hatzikiriakos, Roland Vogel; Rheology of metallocene polyethylene…
The magnetic behaviour of nanocrystalline ferrite is compared with the diluted dispersion systems containing 10–40 wt-% nickel ferrite in a polyethylene matrix. The zero field cooled (ZFC)/field cooled (FC) magnetic measurements [ M( T)] and M( H) measurements suggest strong evidence of interparticle interaction (dipo…
Abstract We carried out a theoretical study of the rutile TiO 2 (110) surface using ab initio techniques. We investigate the effects of both surface and subsurface defects. These defects consist of a missing oxygen atom in the crystalline structure, the oxygen vacancy. We show that the defect formation energy of oxyge…
In the late 1980’s and early 1990’s, various media in karst environments in the Northern Yukon Territory were examined for their diatom content. Cryogenic cave calcite powders, grus and various ice formations (ice plugs, ice stalagmites and floor ice) were collected from three freezing caves and one slope cave to make…
Temperature dependences of the magnetization and thermal expansion coefficient of the Fe-36% Ni invar alloy in different structural states obtained upon plastic deformation by torsion under a quasihydrostatic pressure followed by annealing at different temperatures are studied. A decrease in the thermal expansion coef…
Abstract Three kinds of MgC 2 O 4 ·2H 2 O were prepared by the precipitation method with different raw materials, and MgO with high surface area was obtained via thermal decomposition of MgC 2 O 4 ·2H 2 O in different atmospheres. The precursor MgC 2 O 4 ·2H 2 O and as-prepared MgO were characterized by XRD, BET, TEM,…
For a long time in the Russian Federation the computer code for analysis of severe accidents is being developed. The main peculiarity of this code from the known computer codes for analysis of severe accidents at NPP such as MELCOR and ASTEC, is a consequent realization of the mechanistic approach for modeling of the…