Materials Literature
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Abstract Magnesium, by volume, is two-thirds the weight of aluminum and one-quarter the weight of steel. It also has good damping capacity, giving it an edge over other metals in high-vibration environments. This chapter discusses the basic metallurgy, alloy designations, compositions, and mechanical properties of cas…
Blends of poly(methyl methacrylate) (PMMA) with ethylene - methyl acrylate (EMA) copolymers of different compositions, viz. 95/05, 90/10, 85/15 and 80/20 wt.% were prepared by a melt mixing technique using a twin-screw extruder. The blends were characterized by thermo-analytical methods, viz. differential scanning cal…
The effects of Sn on the mechanical properties of magnesium alloy AZ61 have been investigated. The results show that the addition of 0.5wt.% Sn can refine the grain size, improve the morphology of β-Mg17Al12 phase, and cause the formation of Mg2Sn phase. The improved microstructure results in the enhanced mechanical p…
CH4 and CO2 are greenhouse gases. Hence, their emission to the atmosphere must be controlled to avoid the global warming. Dry reforming of methane could provide a valuable tool in alleviating this problem as well as producing synthesis gas. This process is hampered by rapid catalyst deactivation due to carbon depositi…
Summary The corrosion behavior of 3% Cr steel is tested by a high-temperature/high-pressure autoclave. The corrosion environment is categorized into CO2-alone and CO2/H2S conditions. At 90°C, with the addition of H2S to the CO2, the surface corrosion condition improved greatly, and the corrosion rates declined compare…
The static second-order nonlinear optical (NLO) properties on a series of phenyl nitronyl-nitroxide (NN) radical derivatives were investigated using density functional theory (DFT). It is found that the first hyperpolarizabilities of these systems are sensitive to the substituents, and system 4a containing of a two-di…
Silica of hollow structure exhibits a number of special characteristic. In this paper, a new way to prepare hollow silica spheres which can be used as filler for paper was reported. In this approach, when silica shells were coated on polyvinylacetate (PVAc) template particles by the sol-gel method, the PVAc cores woul…
The geometric shape of a crystal can be simulated via a thermodynamic model using breaking bond energy calculations. When this model was applied to the case of the KDP crystal, a thermodynamic description of the KDP crystal growth was successfully developed, which was consistent with experimental observations. Additio…
SiO2 surface is first modified with 3-trimethoxysilyl propyl methacrylate (MPS) in order to graft with polymerized butyl methacrylate (BMA) to form SiO2@MPS-BMA core--shell hybrid particles. The polymeric BMA shell enables anchoring of aluminum ions in tetrachloroethylene solvent, results in SiO2 @Al2O3 composite part…
The subnanosecond time-resolved ultraviolet luminescence of Li 6 Gd(BO 3 ) 3 : Ce crystals under selective excitation by ultrasoft X-rays in the region of the 4 d →4 f core transitions at temperatures of 7 and 293 K has been investigated for the first time. The performed investigation has revealed the following featur…
Abstract The evolution of ion‐beam induced surface roughening of PMMA was investigated using an anode‐layer ion beam source with O 2 , Ar, and their mixture. Use of the O 2 ion beam created rough granular patterns on the surface of PMMA because O 2 ions could break the CC backbone and subsequently combine with the br…
The increase in demand for electricity and the growing energy density in the metropolitan areas have made it necessary to extend the high voltage network right up to the consumer. Gas insulated substations provide a best solution to the above problem and have been functioning for more than 30 years around the world. S…
Pseudocubic crystals of (Fe,Mg,Mn) 3 B 7 O 13 Cl borate, ≤ 1.2 mm in size and yellowish through pale-violet to pale-violet-brown and brownish in color, were found in the Klodawa salt dome, located within the Mid-Polish Trough (central Poland), an axial part of the Polish basin belonging to a system of Permian-Mesozoic…
Abstract Metal nanoparticles are now creating a new class of materials that are different from either conventional bulk materials or atoms, giving one of the smallest building blocks of matter. Metal nanoparticles have various properties based on high surface area and quantum size effects. Here we focus on the applica…
We observed the dopant contrast of an InP structure with magnifications as high as 250,000 by simultaneously applying secondary electron energy-filtering and a reverse bias voltage. The detection modes without energy-filtering and without a bias voltage did not generate a clear contrast. This was because the reverse b…
Excessive cyanobacterial growth in eutrophic water sources is a serious environmental problem. Physical adsorption has been reported as an efficient method for cyanobacterial control, but organic polymers as adsorption materials were seldom used. Macroporous organic polymer materials have been prepared with the templa…
Electrical treeing is one of the main reasons for failure of polymeric materials used in high voltage applications. Treeing is observed to originate at points where impurities, voids, defects, or conducting projections cause excessive local electric field stress in the dielectric. It has been proposed that nanofillers…
We theoretically investigate the thermoelectric property of a graphene sheet coupled to two ferromagnetic electrodes with noncollinear magnetic moments. By using the nonequilibrium Green's function combining with the tight-binding Hamiltonian, it is demonstrated that the thermopower weakly depends on the polarization…
Chitosan solution was applied to coated ivory board as a barrier material, and the surface microstructure, oxygen resistance and water vapor permeability of chitosan-coated paper under different coating weight were studied. According to the images of scanning electron microscope(SEM) and Atomic force microscope(AFM),…
Characteristics of surface flashover in the presence of different dielectric materials have been investigated. Lightning voltage impulses (1.2/50 μs) have been applied to a rod-plane gap of 250 mm, bridged by cylindrical solid dielectrics with circular cross-section of 10 mm. The materials used are polythene, polymeth…