Materials Literature
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As IC performance increases, many technical challenges appear in the areas of current-carrying capacities, thermal management, I/O density, and thermal-mechanical reliability. To address these problems, the use of aligned carbon nanotubes (CNTs) has been proposed in IC packaging for electrical interconnect and thermal…
The anisotropic magnetic, electrical and thermal transport properties were studied of a single-crystalline Al80Cr15Fe5 approximant to the decagonal quasicrystal. The temperature-dependent electrical resistivity along the b and c crystalline directions shows non-metallic behaviour with a broad maximum, whereas it exhib…
xBiFeO(3)-(1-x)PbTiO(3) single crystals were grown via a flux method for a range of compositions. Presented here is a study of the domain configuration in the 0.5BiFeO(3)-0.5PbTiO(3) composition using electron backscatter diffraction to demonstrate the ability of the technique to map ferroelastic domain structures at…
Abstract Gaseous hydrogen transport at pressures of 15 MPa is envisaged as a means of hydrogen delivery from central production facilities to refueling stations for the planned hydrogen economy. The study of the hydrogen embrittlement of medium or mild strength steels, which are under consideration for pipeline materi…
Although quasicrystals have been studied for 25 years, there are many open questions concerning their stability: What is the role of phason fluctuations? Do quasicrystals transform into periodic crystals at low temperature? If yes, by what mechanisms? We address these questions here for a simple two-dimensional model…
Experimental data are used in an attempt to unravel the mechanism underlying the effect of modification of a graphite blend by fullerenes on the diamond synthesis at high pressures and temperatures in the presence of metal catalysts. Diamonds have been synthesized under different conditions in a wide range of temperat…
Toluene, the alkyl benzene, is a common constituent of contaminant streams emitted by hydrocarbon fuel combustion systems. The oxidation of toluene to less toxic compounds can be enhanced through catalysis. The capacity of Mn-Ce/gamma-Al2O3 to catalyze toluene oxidation was investigated using a fixed bed flow reactor,…
Abstract Sufficient mechanical ductility of high-burnup Zircaloy-4 fuel cladding is important to prevent large-opening ruptures and significant fuel dispersal during postulated in-reactor and spent-fuel processing accidents. The effect of irradiation, oxidation, and hydriding at high fuel burnup may degrade cladding d…
X-ray diffraction and electron microscopy were used to study the structural states of precursors of borates LuBO 3 , YBO 3 , and EuBO 3 , garnets Lu 3 Al 5 O 12 and Y 3 Al 5 O 12 , and perovskites LuAlO 3 and LaAlO 3 prepared by solvent thermolysis from a nitric-acid solution or an ammonium nitrate melt solution of si…
The effects of the concentration of a number of dyes in an aqueous solution and of the method of formation of mixed nanostructures of dyes and Eu(MBTA)3phen (MBTA is p-methoxybenzoyltrifluoroacetone; phen is 1,10-phenanthroline) complexes that form these structures on the luminescence decay kinetics of Eu(III) ions ar…
Within a nonempirical model of an ionic crystal with the inclusion of the dipole and quadrupole ion polarizations, the lattice vibrational frequencies, high-frequency dielectric constant, Born dynamic charges, and the elasticity moduli of the BiFeO 3 crystal have been calculated and their dependencies on the hydrostat…
First-principles calculations have been performed to investigate the ground state electronic properties of BaFeO 3 (BFO). Local spin density approximation (LSDA) plus U (LSDA+U) treatment modified the metallic behaviour to insulated one with a band gap of 4.12 eV. The spontaneous polarization was found to be 89.3 μC/c…
Pyrazinamide (PZA) is an antitubercular drug, with molecular formula C 5 H 5 N 3 O. The FTIR and FT Raman spectra of PZA have been recorded in the region 4000 - 400cm -1 and 3500 - 50cm -1 , respectively for molecular study. A detailed vibrational analysis has been made on the fundamental modes of vibration. A normal…
In the brain after infarction or trauma, the tissue becomes pannecrotic and forms a cavity. In such situation, a scaffold is necessary to produce new tissue. In this study, we implanted a new porous gelatin-siloxane hybrid derived from gelatin and 3-(glycidoxypropyl) trimethoxysilane (gelatin-GPTMS) scaffolds into a b…
Dingdaohengite-(Ce), ideally Ce 4 Fe 2+ Ti 2 Ti 2 (Si 2 O 7 ) 2 O 8 , is a new member of the chevkinite group minerals from the world-famous Bayan Obo REE-Nb-Fe Mine near Baotou city, Inner Mongolian Autonomous Region, North China. It occurs in the magnesian skarn in the excontact of granite within dolomitic marble. M…
An association between gadolinium-containing contrast and the development of nephrogenic systemic fibrosis (NSF) has been increasingly recognized. For patients receiving hemodialysis (HD) who are exposed to gadolinium, the Federal Drug Administration (FDA) recommends HD to remove this contrast agent in order to minimi…
The product composition and reaction kinetics are reported for 2,3,6-trimethylphenol (TMP) oxidation with hydrogen peroxide in acetonitrile catalyzed by a Ti-monosubstituted polyoxometalate (Ti-POM) with a Keggin structure ([Bu4N]4[PTi(OMe)W11O39]) and for the stoichiometric reaction between TMP and the peroxo complex…
We present an overview of experimental studies of the structure of adsorbed atomic and molecular species on quasicrystal surfaces with a particular focus on those systems where quasiperiodic ordering of the adsorbate structure occurs. Atomic adsorption is illustrated with examples from studies of Fe and Gd adsorption…
To prepare elastomers with acceptable physical properties and good blood compatibility, polyurethane networks were synthesized via crosslinking reaction of epoxy-terminated polyurethane prepolymers (EUPs) and hexamethylene diamine. EUPs were prepared by reacting glycidol and NCO-terminated polyurethanes. All new mater…
Common activation mechanisms, which are responsible for infiltration in other non-wetting systems, play only a secondary role in the Ti activated Al2O3/X3CrNiMo13-4 system for pressureless alloy infiltration into porous ceramic preforms. Experiments with a model pore consisting of two juxtaposed parallel alumina plate…