Materials Literature
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Abstract Air and moisture sensitive K 29 Mn 17 O 34 , Rb 11 Mn 8 O 16 and Cs 4 Mn 3 O 6 were prepared via the azide/nitrate route from stoichiometric mixtures of the precursors Mn 2 O 3 , A N 3 and A NO 3 ( A = K, Rb, Cs) in special containers provided with silver inlays. Their compositions can be generalized as A x M…
Corrosion resistance of three metals namely, SS 316L, mild steel (MS) and mild steel coated with zinc (MS-Zn) has been evaluated in artificial saliva in the absence and presence of spirulina. Potentiodynamic polarization study and AC impedance spectra have been used to investigate the corrosion behaviour of these meta…
En el presente estudio, se utilizó carbonilla de carbón vegetal y aserrín de Pinus radiata (D. Don) para fabricar pellets, con similares características en peso, volumen y densidad, manteniendo como única variable, la cantidad de aserrín y carbonilla en cada pellets.Utilizando una prensa de tornillo manual, se elaboró…
Abstract The optimization of chemical processes that take place in a finite time constitutes an important application of finite‐time thermodynamics. In this study we investigate two generic optimal control problems for nucleation‐and‐growth based syntheses: the maximization of the amount of a crystalline solid phase g…
In this paper, solute concentration and precipitate content in A2024 aluminum alloy are adjusted by solution treatment (ST) at different temperatures and tensile experiments on these treated specimens are carried out. It is found that the temperature of solution treatment (ST temperature) has a remarkable influence on…
When planar graphene sheets are stacked on top of each other, the electronic structure of the system varies with the position of the subsequent sublattice atoms. Here, we employ scanning photocurrent microscopy to study the disparity in the behavior of charge carriers for two different stacking configurations. It has…
Al-doped ZnO (AZO) films were sputter deposited on glass substrates heated at 200 °C under incident angles of sputtered particles at 0° (incidence normal to substrate), 20°, 40°, 60°, and 80°. In the case of normal incidence, x-ray diffraction pole figures show a strong [001] preferred orientation normal to the film s…
We study the origin of interface states in carbon nanotube intramolecular junctions between achiral tubes. By applying the Born-von Karman boundary condition to an interface between armchair- and zigzag-terminated graphene layers, we are able to explain their number and energies. We show that these interface states, c…
NiCuZn ferrites are widely employed for many electronic applications, but can be replaced by MgCuZn ferrites owing to their superior properties like low magnetostriction, environmental stability, low stress sensitivity and low cost. In view of this, a series of non-stoichiometric MgCuZn ferrites (Mg0.5−xCuxZn0.5Fe1.9O…
The nanostructure of SBA-15 ordered mesoporous silica is modeled by considering a full crystallite about 500 nm in size. The lattice sites of a 2D hexagonal lattice are occupied by circular mesopores that exhibit a size distribution and a rough pore wall. In addition, the walls of the ordered pores contain randomly di…
A hybrid p–n junction was fabricated by using chemically synthesized cadmium sulfide (CdS) nanoparticles and spun films of poly (9-vinayl carbazole) (PVK). The junction appeared to be nearly ideal from the current–voltage measurements. The analysis of capacitance–voltage characteristics produced a value of nearly 1 V…
Progress in experimental methods of serial sectioning and orientation determination opens new opportunities to study inter-crystalline boundaries in polycrystalline materials. In particular, macroscopic boundary parameters can now be measured automatically. With sufficiently large data sets, statistical analysis of in…
Mechanical alloying plus hot-pressing was employed to prepare nanocrystalline (Mg 1− x Zn x ) 3 Sb 2 compounds that were characterized by microstructural examinations and dc electrical resistivity, Seebeck coefficient and thermal conductivity measurements. The results indicated that the grain size of (Mg 1− x Zn x ) 3…
We report the synthesis and the characterizations of a novel dyad composed of a zinc porphyrin (ZnP) linked to a gold porphyrin (AuP) through an ethynyl spacer. The UV/Vis absorption spectrum and the electrochemical properties clearly reveal that this dyad exhibits a strong electronic coupling in the ground state as e…
The luminescence properties of Ce 3+ activated Ba 2 Ca(BO 3 ) 2 with K + as a charge compensator have been investigated and compared with those with Na + -compensating. Energy transfer of Ce 3+ in Ba 2+ (i.e. Ce(1) 3+ ) and Ca 2+ (i.e. Ce(2) 3+ ) sites has been proven by VUV–UV excitation and emission spectra, lumines…
The use of transfer-matrix analyses for characterizing planar optical superlensing systems is studied here, and the simple model of the planar superlens as an isolated imaging element is shown to be defective in certain situations. These defects arise due to neglected interactions between the superlens and the spatial…
In this paper, the optimization of typical reaction variables for a pilot scale synthesis of carbon nanofibers (CNFs) using a fixed-bed reactor has been carried out to provide a more economically viable large scale production of these materials. Using a Ni/SiO 2 catalyst (10 wt % Ni) and ethylene as the carbon source,…
Abstract The feasibility of producing dissolving grade pulps for viscose production from different fiber raw materials, such as paper grade pulps from wood and non-woody plants, was investigated. Commercial dried bleached hardwood kraft pulps from eucalypt, and bleached non-wood soda/AQ pulps from flax, hemp, sisal, a…
A self-consistent mean-field theory (SCMFT) study on the phase behaviors of AB-diblock copolymer solutions is presented. All of the possible thermodynamically stable ordered structures verified by experiments are considered and the phase diagrams are generated. This work mainly focuses on the cases of selective solven…
The paper addresses the issue of modelling offset minor hysteresis loops within the framework of the Jiles–Atherton model. Two of the model parameters are expressed in terms of scaling power laws with respect to the magnetization level. The approach is consistent with earlier theoretical considerations on the effectiv…