Materials Literature
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The fracture surface records past events that occur during the fracture process by leaving characteristic markings. The application of fractal geometry aids in the interpretation and understanding of these events. Quantitative fractographic analysis of brittle fracture surfaces shows that these characteristic markings…
Tb-2Fe and Sm-2Fe molten alloys with a 1:2 molar ratio were unidirectionally solidified separately in microgravity and normal gravity in concurrence with a magnetic flux (0-0.12T). The Tb-2Fe molten alloy was solidified unidirectionally in microgravity with a 0.1T magnetic flux and the solidification product, TbFe2, h…
Next generation of reusable launch vehicles and new hypersonic space vehicle concepts are currently under development, moving from traditional aerodynamic configuration towards slender profiles. Main expected benefits are reduction of drag, enhancement in lift-to-drag ratio and reduction of interferences with radio fr…
This DOI is not currently attached to any metadata records. DOIs can’t actually ever be deleted (they’re persistent), but sometimes our members create DOIs in error. We do have a process to approximate deletion which we follow only in rare cases where the DOI has been genuinely created in error, and most crucially, if…
Nanocomposites made of linear low-density polyethylene (LLDPE) and two different types of clays were obtained and studied by using zinc neutralized carboxylate ionomer as a compatibilizer. Two different clays, natural montmorillonite (Closite Na+) and a chemically modified clay Closite 20A has been used. Nanocomposite…
The corrosion test for magnesia-carbon refractory, MgO-C, with dense layer has been carried out by a rotating cylinder method at 1673 K. The specimen, which was a cylinder of 25 mm diameter and 25mm height, was rotated in molten slag at 50 rpm. The chemical composition of slag was CaO-SiO2-FeO-MgO-CaF2. The corrosion…
Nano-sized powders of CaCu3Ti4O12 (crystallite size of 44, 58 and 71 nm) have been synthesized by a polymerized complex method, followed by calcination the synthesized precursor at 600, 700 and 800°C in air for 8h. The CaCu3Ti4O12 powders were then characterized by XRD, FTIR and SEM. Sintering of the powders was condu…
Shape memory alloy (SMA) wires in their superelastic (austenitic) form are studied under a variety of loadings in order to evaluate their use in structural earthquake engineering applications as passive control devices. Past studies of superelastic wires have shown that SMAs have the ability to provide both recenterin…
Diamond exhibits the highest breakdown field and the highest carrier mobilities of any wide band gap semiconductor. Because of these and other outstanding material properties, diamond potentially enables the development of high-voltage and high frequency electronic devices with superior performance. The high field ele…
Materials in the Ti-Al-C-N system due to their specific heterodesmic structure show pseudo-plastic properties. Direct synthesis of these compounds from respective elements requires high-temperature and long-lasting reaction. Presented work shows attempts to prepare some ternary compounds using self-propagating high-te…
Shape memory alloys (SMAs) are a class of smart material having the unique ability to return to a predefined shape when heated. These materials are employed in a variety of emerging applications, and may potentially be used to avoid traditionally voluminous and heavy prosthetic actuators. The primary focus of this art…
Especially during last years, fundamental discoveries of various species and modifications of carbon nanotubes have stimulated research on their application including in human medicine. The success of these applications depends significantly on the physical, chemical and biological properties of the carbon nanotubes a…
A pseudoboehmite was obtained by sol-gel synthesis using aluminum nitrate as precursor. It was used a 2n full factorial design for studying the effect of the temperature of synthesis, the concentration of ammonium hydroxide, and the radiation dose in the product of sol-gel synthesis. The product of the synthesis was a…
We report on the measurements and analyses of resistivity, Hall coefficient, and thermopower of the misfit-layered compound, [Sr 2 O 2-δ ] p CoO 2 , using single-crystalline samples obtained by a high-pressure technique. Using a polycrystalline sample, magnetic susceptibilities are measured to roughly characterize the…
Recently, the sigma-aromaticity model proposed for cyclopropane by Dewar was employed to account for the stability of Group 8 trinuclear metal-carbonyl compounds [M(3)(CO)(12)] (M=Fe, Ru, Os). This paper further examines this hypothesis and provides the first quantitative evidence for the sigma-aromatic/antiaromatic n…
Therapeutic strategies based on cell and tissue engineering can be advanced by developing material substrates that effectively interrogate the biological compartment, with or without the complimentary local release of growth factors. Poly(ether ester) segmented copolymers were engineered as model material systems to e…
The dynamics of exciton spin relaxation in CdSe nanorods of various sizes and shapes are measured by an ultrafast transient polarization grating technique. The measurement of the third-order transient grating (3-TG) signal utilizing linear cross-polarized pump pulses enables us to monitor the history of spin relaxatio…
Non-oxide composites are interesting materials for long term applications at high temperature under oxidizing atmosphere. To improve their lifetime, self-healing [Si-B-C] matrix has been developed recently. On this new generation of composite, fatigue has been studied at high temperature (up to 1200°C) in air. For the…
Aiming at the purpose of using carbon nanotubes as secondary phase in composite materials, removal of metal catalyst, catalyst support and amorphous carbon is crucial to make the most of the required properties. A purification method was developed to remove the metal catalyst from multi-walled nanotubes grown by therm…
Three-dimensional biodegradable porous scaffolds play an important role in tissue engineering as temporary templates for transplanted cells to guide the formation of the new organs. Two kinds of novel biodegradable porous scaffolds for tissue engineering have been developed by our group by hybridizing synthetic poly(α…