Materials Literature
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Abstract For controlling a reactive extrusion process in the subsequent study. the model equations of reaction kinetics and shear viscosity were studied. We focused on a free radical reaction between the molten polyethylene and vinylsilane. The kinetics model was expressed as a reaction rate equation with an apparent…
Composites of β‐Ce 2 O 3 ·11Al 2 O 3 and tetragonal ZrO 2 were fabricated by a reductive atmosphere sintering of mixed powders of CeO 2 , ZrO 2 (2 mol% Y 2 O 3 ), and Al 2 O 3 . The composites had microstructures composed of elongated grains of β‐Ce 2 O 3 ·11Al 2 O 3 in a Y‐TZP matrix. The β‐Ce 2 O 3 ·11Al 2 O 3 decom…
The features of the temperature behavior of the lattice constant and the coefficient of thermal expansion of silicon crystals are analyzed in the bond-charge model. The coefficient of thermal expansion and the Grüneisen factor for the natural isotopic composition are described to reasonable quantitative accuracy. The…
We present experimental results of a Kretschmann-prism coupler method used in Raman scattering experiments with ultrathin (few nanometers) TiO2 sol–gel films deposited on a metallic silver layer characterized by surface plasmon resonance (SPR) experiments. In this article, we describe a new optical device as an applic…
The phosphinic analogues of tyrosine and pyruvate were first demonstrated to be substrates in the reactions of elimination and synthesis catalyzed by tyrosine phenol-lyase. Kinetic parameters of the enzymatic process were determined, and the first enzymic synthesis of an aminophosphinic acid was carried out. Replaceme…
Oriented growth of diamond on hexagonal GaN thin films has been performed using microwave plasma-assisted chemical vapor deposition (MPCVD). GaN layers grown on sapphire substrates are utilized as a substrate. The growth process consists of three steps: (i) carburization, (ii) bias-enhanced nucleation (BEN) and (iii)…
Abstract A proposed kinetic-based method for interpreting ASTM C 1260 test results is introduced that appears capable of overcoming some of the shortcomings currently encountered using a percent expansion criterion for defining potentially reactive aggregate. The method is based on nucleation and growth or phase trans…
Abstract We present experimental data for the Pm 3 m - I 4 /mcm phase transitions in the perovskite crystals KMn 1-x Ca x F 3 and SrTiO 3 . Comparison of calorimetric data (latent heat and specific heat) with order parameter data (measured with X-ray rocking methods) indicates that these transitions follow mean-field…
Abstract This chapter covers the basic metallurgy of titanium, explaining how it influences the development of microstructure and the mechanical properties that can be achieved. It describes the nature of each of the four major phases of titanium, the effect of alloying elements on phase transformations, and the forma…
This paper recommends Pt-oxide for noble electrode of capacitor in advanced ferroelectric random access memory (FRAM). Pt-oxide was deposited by an rf magnetron sputtering system with varying O 2 flow ratio [O 2 /(O 2 +Ar)] on sol-gel derived Pb(Zr,Ti)O 3 . The deposition rate of Pt-oxide was higher than that of Pt be…
The transmission characteristics of wire grid polarizers fabricated in finite apertures are investigated by using a three-dimensional finite-difference time-domain formulation. Specifically, the optical transmissivity and extinction ratio are characterized for a wide variety of geometrical parameters including apertur…
The corrosion resistance of a unidirectionally solidified alumina/yttrium aluminum garnet (Al 2 O 3 /YAG) eutectic mixture was investigated at high temperature. Samples were exposed to high temperature (1200°–1800°C) in different atmospheres, which included argon, argon/water vapor, air, and air/water vapor. The most…
X-ray photoelectron spectra of Na 2 O-Al 2 O 3 -SiO 2 glasses were measured by a monochromatised Al-Ka XPS instrument with a novel charge control method. Chemical shifts of core level photoelectron spectra of the glass constituent ions were investigated with glass composition with respect to the external energy refere…
Electronic band structure calculations based on the full-potential linear augmented plane-wave method have been performed for ${\mathrm{Fe}}_{16}{\mathrm{N}}_{2}.$ The calculations are performed with the crystal parameters recently refined [H. Tanaka et al., Acta Mater. 45, 1401 (1997)] in addition to the previous rep…
FTIR Characterization of Fluorine Doped Silicon Dioxide Thin Films Deposited by Plasma Enhanced Chemical Vapor Deposition, Wang Peng-Fei, Ding Shi-Jin, Zhang Wei, Zhang Jian-Yun, Wang Ji-Tao, Lee William Wei
Polycarbonate is a very broadly used material across various industries; however, in order to improve its processability, it is generally blended with acrylonitrile–butadiene–styrene copolymer (ABS). As presented here, the proportion of ABS used is a highly important parameter, since it can affect the useful propertie…
Catalysts, coatings, and structural components are some of the applications of the synthetic inorganic materials described here, which range from zeolites to carbides and nitrides. The in-situ growth of β-Si3N4 whiskers from α-Si3N4 grains is depicted the Figure. Self-reinforced silicon nitride results, as the whisker…
Effects of the concentration of poloxamer 407, temperature, and the concentration of sericin on the gelation of silk sericin (SS) were studied. Gelation of SS was accelerated with an increase in poloxamer concentration and temperature. The sol-gel transition of SS became irreversible with respect to the temperature in…
The near-infrared spectrum of hydrothermally synthesised pyrophyllite (400° and 450 °C at 1 kbar for 7 days) has been compared to that of natural pyrophyllite. The near-infrared spectra are very similar and only very minor differences are observed in the band positions and intensities. The bands >7,000 cm are assig…
Ti-13Nb-13Zr is a new titanium alloy that was originally developed for medical implant applications. This alloy combines a low elastic modulus, high strength, excellent hot and cold workability, and superior corrosion resistance. Research on this alloy has shown that the mechanical properties can be controlled over a…