Materials Literature
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Complexing agents in Cu chemical mechanical planarization slurries promote dissolution of the copper surface. We explored the effect of two chelating compounds, ammonium oxalate and oxalic acid, with and without hydrogen peroxide, on the dissolution and surface morphology of a Cu(111) surface at neutral pH. Without hy…
The synthesis of carbon nanofibers at low temperature was performed by plasma-enhanced chemical vapor deposition using a low-temperature CO/Ar/O2 DC plasma without any catalyst materials. At the optimum oxygen concentration of O2/CO = 0.002–0.005, vertically aligned CNFs can be synthesized at temperature as low as 90°…
Near-Field Electrospinning (NFES) is a newly developed method to fabricate continuous and ordered solid nanofibers, with smaller spinneret-to-collector-distance the behavior of viscous jet would play a more prominent effect on the deposition and morphology of nanofiber. In this paper, a 2-dimentional physical model ba…
Hexanitrohexaazaisowurtzitane (CL‐20) powders were compacted under quasi‐static and dynamic loading conditions. A uniaxial compression apparatus quasi‐statically compressed the powders to 90% theoretical maximum density with applied stresses up to 0.4 GPa. Dynamic compaction measurements using low‐density pressings ap…
Lean premixed (LP) combustion is limited to a minimum NOx of 5–9 ppm due to flame stability. To improve flame stability and lower NOx, an advanced Rich Catalytic Lean-burn technology was developed and integrated to replace only the injector pilot with catalyst modules. This system focuses on replacing the highest temp…
We study the enhanced absorption of optical radiation by molecules placed in the vicinity of spherical metal nano-particles in the realistic situation that includes perturbation of the optical field by the absorbing molecules and show that the enhancement is strong only for relatively weak and diluted absorbers.
Protein self-assembly into highly ordered fibrillar aggregates has attracted increasing attention over recent years, due primarily to its association with disease states such as Alzheimer's. More recently, however, research has focused on understanding the generic behavior of protein self-assembly where fibrillation i…
Highly crystalline, defect free ZnO nanoparticles have been synthesised by the chemical co-precipitation technique. The product sample was characterised by the X-ray diffraction (XRD) and UV-visible absorption spectra. Analysis shows that there is no indication for oxygen vacancies in the as-prepared ZnO nanomaterials…
The authors investigated the viability of UHMWPE composites for use in orthopaedic bearing applications as an alternative to crosslinking. Two composite systems were used, both based on a UHMWPE matrix: PtZr quasicrystals and Zr particle fillers. Through wear testing and impact toughness measurement it was shown that…
Abstract Quasicrystals made with Ti, Zr and Ni are good candidate materials studying the magnetic properties of aperiodic structure because the role of Ni in stabilization of the quasicrystal phase is important. Various magnetic states in quasicrystals have been reported including diamagnetism, paramagnetism, spin gla…
Tolerance factor controlled Mn-based colossal magnetoresistance (CMR) thin films (La0.7Ca0.3MnO3, La0.7Sr0.3MnO3, La0.7Sr0.11Ba0.19MnO3, and La0.7Ba0.3MnO3) which have the same content of divalent cation and Mn3+/Mn4+ ratio were deposited on amorphous SiO2/Si substrate by rf magnetron sputtering at 350°C substrate tem…
Equilibrium of Cr atoms between the surface layer and bulk of a binary alloy was analyzed. The Gibbs adsorption equation was used to obtain the dependence of the adsorption activity of atoms in the surface layer on their activity in the bulk. An approximate thermodynamic method was used to calculate the adsorption of…
We found that scanning electron microscopy (SEM) of alkali-etched cross-sections of wool fibers provides characteristic images consisting of stitch patterns (SP) and amoeba patterns (AP) at the cortex and that both the SP and AP appearing as convex structures are originated from cell membrane complexes, nuclear remnan…
Semiconductor hetero-nanocrystals with a small CdSe core and a thick CdS shell show nearly complete, suppression of Auger recombination, which allows for efficient optical gain with a very large bandwidth and record-low excitation thresholds.
Magnetic soils forming on tuffite of the region of Alto Paranaíba, Minas Gerais, Brazil, usually contain iron-rich spinels exceptionally rich in magnesium and titanium. In this work, samples of the magnetically separated portion from the sand fraction of a Brunizém (Chernossolo) and from its mother-rock material were…
Milking machine characteristics, as liner type, can influence milk flow trait and teat apex condition. The aim of the study was to investigate the effects of liner type on milk flow traits and teat apex condition. In addition, the age of the liner was taken into account. Four commercial farms were visited three times…
The paper reports the possibility of joint separation of 137 Cs and 85 Sr from neutral and alkaline aqueous solutions by their coprecipitation with the solid phase of complex compounds [M(18-crown-6)]BPh 4 (M=Na + , Cs + ), as well as to study the coprecipitation of 137 Cs and 85 Sr with the solid phase CsBPh 4 . It i…
Different from simple stimuli-sensitive microgels, herein, we report “self-oscillating” microgel. This microgel shows an autonomic and periodical swelling/deswelling oscillation that is synchronized with redox oscillation of the Belousov-Zhabotinsky (BZ) reaction. The cross-linked microgels were synthesized by the cop…
Multi quantum well structures in the deep blue emitted system 2-methyl-9,10-di(1-napthyl)anthracene (α, α-MADN) are fabricated. The device structures are optimized with respect to the layer thickness and number of pairs forming the quantum wells. The Electroluminescence spectra are de-convoluted into 3 peaks with peak…
To calculate the performance of energetic salts by applying thermo-chemical codes, new theoretical tools are required to predict their densities and formation enthalpies. The density of salts is evaluated using new models based on volume additivity. First, an existing group additivity method for neutral compounds has…