Materials Literature
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This study is concerned with the thermal vibration analysis of a short single-walled carbon nanotube embedded in an elastic medium based on nonlocal Timoshenko beam model. A Winkler- and Pasternak-type elastic foundation is employed to model the interaction of short carbon nanotubes and the surrounding elastic medium.…
Atomized spray deposition of 3,4-ethylenedioxythiophene monomer in the presence of triflic anhydride vapour yields electrically conducting poly(3,4-ethylenedioxythiophene) layers.
El objetivo de este estudio es evaluar de manera preliminar si materiales denominados "verdes" o "biodegradables" son degradados satisfactoriamente en sistemas de composta con lombriz a pequea escala. La mayora de dichos materiales se elaboran con derivados del papel o con biopolmeros naturales, de los cuales el ms co…
The novel red-emitting phosphors of Eu 3+ -activated CaSr 2 Al 2 O 6 :Eu 3+ were synthesized by conventional solid state reaction. Crystal structure, characteristic luminescence properties and charge compensators effect (Li + , Na + , K + ) are investigated in detail by X-ray diffraction refinement and photoluminescen…
Au nanoparticles are adsorbed onto the surface of vertical ZnO nanowires to fabricate a field emitter. The effective field enhancement factor ( β ) reaches 2.9 × 10 4 . The nanoparticle size is below 10 nm and the diameter of ZnO nanowires is around 50 nm. Under ultraviolet light illumination, the nano-size emitter ha…
Through a low temperature (500 °C) catalyst-free chemical vapor deposition (CVD) method, ZnS nanowires with lengths of up to tens of micrometers were grown in situ on a substrate with CS2, used as the sulfur source, for the first time. The nanowires were characterized and a new crystallographic orientation relationshi…
In previous studies, nano‐hydroxyapatite/collagen/poly(L‐lactic acid) (nHAC/PLA) composites have been prepared and confirmed to repair small sized bone defects. However, they are restricted to repair a large defect without sufficient oxygen and nutrition for cell survival. The result of this study confirmed that nHAC/…
Effects of process parameters on single step fixat ion for react ive printing and crease resistance finishing of cotton fabric has been investigated in this research work using factorial design. 2 3 factorial design have been designed and conducted to check the effect of concentration of crease resistant, urea and tim…
Heat-treated γ-glutamyltranspeptidase of Escherichia coli recovered enzymatic activity after incubation at 4 °C, while heat-treated γ-glutamyltranspeptidase of Bacillus subtilis did not. Fluorescent spectra, CD spectra, and native polyacrylamide gel electrophoresis analysis suggested that the dimer of E. coli γ-glutam…
Granular ZnO nanostructures of single-crystalline wurtzite hexagonal phases were synthesized by a facile and low-cost chemical method in aqueous condition. The average size of ZnO nanograin increased with reflux time, and it significantly affected the open circuit potential<mml:math xmlns:mml="http://www.w3.org/1998/M…
Synthetic amphiphiles have been found to self-assemble into a variety of structures such as micelles, vesicles, cylinders and lamellae in aqueous media over many length scales. We report herein cation-induced aggregation of hexaaza-cyclophanes in water. Pd(2+)- or proton-induced formation of submicro spherical aggrega…
A novel thermally stable thermoplastic poly(ester-ether) (PEE) elastomer containing imide units was prepared from poly(tetramethylene glycol) (PTMG1000), 1,4-butanediol (BD) and a new imide dicarboxylic acid based on pyromellitic dianhydride (PMDA) and glycine through a traditional chemical two-step method. The struct…
In a previous investigation, a combined addition of zirconium and lanthanum was found to confer more marked grain refining than zirconium alone. The present experimental study confirmed this result. However, in this study, the microstructure was examined with more attention to the form of the zirconium-rich coring in…
NaYF 4 :Yb 3+ /Er 3+ up-conversion phosphors were prepared by a solvothermal method. The dependence of the green emission intensity on the changes in the particle shapes and the structure was investigated. Both the ratio of oleic acid to NaF (R O/N ) and the concentration of the reactants strongly influenced the parti…
The morphology and spatial distribution state of CaF2 nanocrystals in oxyfluoride glass-ceramics based on the ErF3–CaF2–Al2O3–SiO2 system with different ErF3 contents of 1–3 mol % and the addition of AlN were examined from transmission electron microscope (TEM) observations. The content of 3 mol % ErF3 induced the gro…
The new group of surfactants was synthesized based on corn oil and monoethanolamine and their inhibiting action on the corrosion of mild steel in CO2-saturated solution was investigated by means of potentiodynamic polarization and linear polarization resistance corrosion rate. The results revealed that, the studied su…
Temperature dependence of ultrasonic attenuation and allied parameters are investigated for manganese oxide in the temperature range 300-500 K. These calculations are made for longitudinal and shear waves along the , and crystallographic directions of propagation. If the values of second order elastic constants and de…
A carbonization method is reported to improve the thermal conductivity of carbon nanotube (CNT) arrays. After being impregnated with phenolic resins, CNT arrays were carbonized at a temperature up to 1400°C. As a result, pyrolytic carbon was formed and connected non-neighboring CNTs. The pyrolysis improved the room te…
The shape and the size of the γ ′ phase s are the controlling factors for the mechanical and creep properties of nickel-based super-alloys. In order to take into account of the effect of these underlying microstructures on the deformation behavior of these alloys, a multi-scale approach is essential. In this work, a h…
The undoped, polycrystalline diamond films were deposited on tungsten wire substrates by hot filament chemical vapor deposition (HF CVD), using a precursor gas mixture of methanol with excess of hydrogen. The morphology and quality of the as-deposited films were monitored by scanning electron microscopy (SEM) and Rama…