Composite film coatings prepared by cationic polymerization of epoxy-polysiloxane systems
Cationic polymerization of dicyclohexylpropane diglycidyl ether in the presence of boron trifluoride was studied with the aim to prepare hybrid coatings.
Materials Literature
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The effect of drying temperature towards electrical and structural properties of magnesium oxide
In this work, we report on the effects of drying temperature on the electrical and structural properties of MgO thin films. The MgO thin films have been prepared on glass substrates using sol-gel spin coating method. The thin films dried at four different temperatures were then subjected to electrical and structural c…
Structure and properties of titanium β-alloys Ti-Nb-Mo-Zr of medical purpose
Low-modulus titanium β-alloy Ti-26Nb-7Mo-12Zr for medical application, composed of nontoxic elements V and Al was considered. The influence of deformation in combination with heat treatment on the structure and properties of β-alloys such as elastic modulus, yield strength and tensile strength, ductility was investiga…
Rheological Behavior of Bamboo Charcoal PET
In this paper some of rheological properties of bamboo charcoal polyester (BC-PET) are presented. The BC-PET is derived from PET modified through commix with bamboo charcoal master batch. The additive content of blends ranged between 0% and 10%. Rheological measurements were effectuated with a Brookfield viscometer (R…
Differentiation of the Na,K‖Cl,NO2,NO3 quaternary reciprocal system and the phase complex of its stable partitioning triangle NaNO2-KCl-KNO3
The Na,K‖Cl,NO 2 ,NO 3 quaternary reciprocal system was differentiated using graph theory with consideration of complex formation and an identified internal partitioning element. The phase complex of the NaNO 2 -KCl-KNO 3 ternary system, which is a stable partitioning triangle of the quaternary reciprocal system, was…
Simulation of diffusion and phase formation during isothermal annealing of lamellar Fe-Zr systems
Results of the simulation of diffusion and phase formation in lamellar Fe-Zr systems subject to sequential isothermal annealing are presented. The simulation is performed in the framework of a physical model whose basis is Darken’s phenomenological theory and the mechanism of mutual diffusion of components along conti…
Dielectric Confinement Effect on Calculating the Band Gap of PbSe Quantum Dots
Considering the dielectric confinement effect on excitonics of PbSe quantum dots (QDs), a correction factor in the wave function was introduced to propose a new band gap calculation model for QDs. The modified model showed great consistency with the experimental data, especially in small size range. According to the v…
Oxidation Conditions of Pure Liquid Metals and Alloys
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Simulation of the atomic and electronic structures of mesoporous SiO2 containing Ti4+ and Zr4+ ions
The influence of Ti and Zr impurity atoms on the atomic and electronic structures of a mesoporous SiO2 matrix is ab initio simulated in a generalized gradient approximation. Energetically favorable positions of titanium and zirconium in the structure are revealed. The incorporation of Zr and Ti ions is shown to decrea…
BURNS TEMPERATURE AND QUANTUM TEMPERATURE SCALE
In this article, two concepts of temperature, i.e., Burns temperature for relaxor ferroelectrics and quantum temperature scale for quantum paraelectrics, are reviewed briefly. Since both temperatures describe the deviation of the dielectric constant from Curie–Weiss law, their relationship is discussed. Finally the co…
Enhancing our Understanding of Protein Structure: the Work of Jane and David Richardson
Jane and David Richardson have worked together since 1964, and their research has made strides in enhancing our understanding of protein structure. Two of the crystal structures they solved are staphylococcal nuclease and copper, zinc superoxide dismutase, both of which were published in the Journal of Biological Chem…
Fabrication of Activated Rice Husk Charcoal by Slip Casting as a Hybrid Material for Water Filter Aid
Activated charcoal has been widely used as an odor absorbent in household and water purification industry. Filtration equipment for drinking water generally consists of four parts, which are microporous membrane (porous alumina ceramic or diatomite, or porous polymer), odor absorbent (activated carbon), hard water tre…
Superaligned arrays, films, and yarns of carbon nanotubes: a road toward applications
Carbon nanotube (CNT) array is a self-organized highly oriented structure, in which CNTs are vertically aligned on the substrate. Superaligned CNT array is a special kind of vertically aligned CNT array with the unique capability of being converted into pure CNT films or yarns simply by drawing in dry state. The as-co…
Magnetostriction “drop” in 〈110〉 oriented polycrystals Tb0.36Dy0.64(Fe0.85Co0.15)2 after transverse field annealing
A 〈110〉 oriented polycrystal Tb0.36Dy0.64(Fe0.85Co0.15)2 was subjected to annealing in a transverse field of 240 kA/m. Axial magnetostrictions (defined as λ∥) of the magnetically annealed specimen were investigated in fields applied at a series of angles θ away from its axis. For the untreated specimen, at the angle θ…
Crack-mechanics based brittle damage model including nonlinear equation of state and porosity growth
A three-dimensional rate-dependent model has been developed for damage and failure of brittle materials under impact. The model extends a recently developed, crack-mechanics based damage model [Zuo et al., Int. J. Solids Struct. 43, 3350 (2006)] to high rate problems by incorporating a nonlinear equation of state (EOS…
Magnetic vector aftereffect model
In addition to the decay of magnetization with time that occurs in scalar processes, in vector processes the magnetization must also rotate toward the easy axis. In this model, each hysteron is characterized by a critical surface. The energy of the hysteron is proportional to the size of the difference between the app…
Numeric simulation of the formation of hexagonal nanoscale structure arrays in anodic aluminum oxide
Formation of hexagonal periodic nanoscale structures at the surface of aluminum oxide is considered in the present paper. The mathematical model of chemical reactions at metal-oxide and oxide/electrolyte interfaces is described. A weak nonlinear approximation near the instability threshold results in the two-dimension…
Influence of the chalcogen substitution on the character of magnetic ordering in Fe0.5TiS2 − x Se x intercalated compounds
The crystal structure and magnetic properties of layered Fe0.5TiS2 − x Se x (0 ≤ x ≤ 2) compounds intercalated by iron atoms have been investigated. It has been shown that the substitution of selenium for sulfur is accompanied by an increase in the unit cell volume, a transition from the ferromagnetic to antiferromagn…
Non-equilibrium molecular dynamics simulation of heat transfer in carbon nanotubes - verification and model validation
Currently there is a lot of ongoing research towards estimation the thermal conductivity of carbon nanotubes (CNT). In the current paper thermal conductivity of SWNT were studied by using non-equilibrium molecular dynamics (NEMD) simulations (implemented in Materials Studio software, Accelerys Inc.). The NEMD techniqu…
A study of via depletion electromigration with very long failure times
Liner coverage in the via plays a critical role on via depletion EM for dual damascene Cu interconnects. Poor liner coverage at the via bottom often results in early EM fails. On the other hand, if the liner at via bottom is permeable to Cu diffusion, thanks to the constant Cu supply into the via from the line below,…