Materials Literature
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The hardness of SiC ceramics plays a significant role in their performance as armor materials. Different hardness measurement techniques and loads, however, substantially influence the hardness values of ceramics, making it difficult to make material comparisons and relate these to performance. In this study hardness…
The purpose of this study was to investigate the effect of cyclic temperature and loading on the fatigue life of a cross ply ceramic matrix composite. The material used in this study was a potassium borosilicate glass (BSG) doped with 5% magnesium aluminosilicate (MAS) cordierite matrix reinforced with Nicalon (silico…
A high-temperature, controlled atmosphere Faraday magnetometer has been used to measure the magnetic susceptibility of La 1− x Sr x CoO 3−δ (LSC) as a function of temperature, Sr content ( x ), and oxygen nonstoichiometry ( δ ). Above 800 °C the magnetic susceptibility becomes independent of Co oxidation state and Sr…
Recovery of ceramics from ballistic experiments in which impacting ductile long-rod projectiles failed to penetrate has led to the observation and understanding of the localized damage mechanisms beneath the region of impact. The shape of the damaged region indicates that these mechanisms are shear-assisted. Based upo…
A glass-ceramic based on the ternary system BaO-CaO-SiO2 was investigated for its application as sealing material for the SOFC. Beside measurements of the physical and chemical properties of the glass itself, the joining properties were investigated. Characterization of the material is done by measurements of the coef…
Diesel particulate filters effectively trap the soot (elemental carbon and associated hydrocarbons) and ash present in diesel engine exhaust. This soot buildup causes an increase in the pressure drop across the filter, resulting in poorer engine performance. This soot buildup must be periodically eliminated by oxidizi…
Four oxide/oxide ceramic matrix composites (CMCs) were investigated in longitudinal tension and transthickness tension. The longitudinal tests were conducted at 23°C and 1000°C, while the transthickness tension tests were only performed at 23°C. The four CMCs showed good high temperature tensile behavior, with the ten…
Novel Ceramic Matrix Composites (CMC), consisting of a multilayer woven, carbon interphase and a self sealing matrix has been developed by SNECMA for achieving high performance levels targeted by the jet engines development programs. The main drive of this development has been to increase both life time and temperatur…
The commonly held view of kaolinite particles in water — that of negatively-charged basal plane surfaces with positive edges — is inconsistent with the mineralogy and dispersion behavior. Kaolinite is a 1:1 sheet silicate, one side silica-like and other aluminum hydroxide-like, with a variable edge nature. Therefore,…
The immobilization scheme of monodispersed gold nanoparticles (10-nm diameter) on piezoelectric substrate surfaces using organosilane molecules as cross-linkers has been developed for lithium niobate (LiNbO3) and silicon oxide (SiO2)/gold-covered lithium tantalate (LiTaO3) of Rayleigh and guided shear horizontal- (gui…
The corrosion resistance of various oxide and non-oxide ceramic materials in hot gas environment was investigated. The tests were performed in a high temperature burner rig at 1450 °C with 100 m/s gas flow speed and a water vapor pressure of 0.27 bar. The corrosion of the materials was characterized by the measurement…
We simulate the phase transition processes of aligned crystalline boron nitride (BN) nanotube bundles under transverse pressure, and investigate the phase transition mechanism and transition conditions. The antiparallel polar bonds rule, associated with the interaction between the tubes, is demonstrated to be crucial…
Although the D-glucarate degradation pathway is well characterized in Escherichia coli, genetic and biochemical information concerning the alternative pathway proposed in Pseudomonas species and Bacillus subtilis remains incomplete. Acinetobacter baylyi ADP1 is a Gram-negative soil bacterium possessing the alternative…
Experimental results are presented that support the surface-catalyzed production of nitric oxide from the recombination of oxygen and nitrogen atoms on quartz. The experiments employ two-photon laser induced fluorescence detection of atomic oxygen and atomic nitrogen to characterize changes in gas-phase atom concentra…
The effect on the hydrogen storage attributes of magnesium hydride (MgH(2)) of the substitution of Mg by varying fractions of Al and Si is investigated by an ab initio plane-wave pseuodopotential method based on density functional theory. Three supercells, namely, 2 x 2 x 2, 3 x 1 x 1 and 5 x 1 x 1 are used for genera…
We report catalyst-free growth of one-dimensional Ga-doped ZnO nanorod arrays on (001) Si substrate with a thin buffer layer by magnetron sputtering. The diameter and length of the nanorods are in the range of 90−144 nm and about 1.38 µm, with an aspect ratio nearly 12:1 and deviation angle ± 6° between the [0001] ZnO…
Following on from the first AMN volume, this handy reference and textbook examines the topic of nanosystem design in further detail. It explains the physical and chemical basics behind the design and fabrication of nanodevices, covering all important, recent advances in the field, while introducing nanosystems to less…
Cyanogels are coordination polymers made from the reaction of a chlorometalate and a cyanometalate in aqueous solution, which undergo a sol-gel transition to form stable gels. At temperatures above 240 degrees C, the cyanide ligand acts as a reducing agent and reduces the metal centers to lower oxidation states. To un…
Abstract Micro‐probe Raman and far‐infrared absorption spectroscopies were used to prove the existence of optical phonon modes of PbSe nanoparticles prepared by colloidal chemistry and preliminarily characterized by transmission electron microscopy. To the best of our knowledge, this is the first time that evidence of…
The electronic structure and magnetic properties of zinc-blende structure M C ( M = Li, Na, and K) are investigated by using the first-principles full-potential linearized augmented plane-wave method. The results show that LiC, NaC and KC are half-metallic ferromagnets with a magnetic moment of 3μ B per formula unit.…