Materials Literature
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Films of carbon nanotubes are interesting for technical applications such as cold cathodes in field emission devices. We discuss experiments in which nanotube films are grown by a simple thermal chemical vapour deposition method from hydrocarbon molecules, employing the catalytic activity of deposited iron particles.…
Abstract A novel catalyst, Ni/Ce-ZrO2 exhibits very high catalytic activity and stability in partial oxidation of methane to synthesis gas. It gives 99.6% CH4 conversion at 850 °C and the activity was maintained for 100 h.
Relibase is a database system that has been specially designed to handle protein-ligand data. Included within Relibase is a tool that can be used to systematically analyse protein-ligand interaction patterns specified by three-dimensional (3D) constraints, revealing favorable combinations of interacting functional gro…
π-Conjugated polymer-protected gold nanoparticles of narrow size distribution in stable colloidal form have been prepared via reduction of HAuCl4 by a π-conjugated poly(dithiafulvene) having electron donating properties.
A new micromachined microbolometer array structure is presented that utilizes a self-supporting semiconducting yttrium barium copper oxide (Y-Ba-Cu-O) thin film thermometer. The Y-Ba-Cu-O thermometer is held above the substrate only by the electrode arms without the need of any underlying supporting membrane. This rep…
A commercially available spin-on glass (methylsilsesquioxane, MSQ) was modified by the introduction of porosity. The porosity reduced the effective dielectric constant of the MSQ by the incorporation of air. The pores were created by adding a sacrificial polymer (substituted norbornene polymer) to the silsesquioxane m…
The aim of this paper is to analyze the interaction of chromate ions with surface intermetallics on Al 2024-T3 in NaCl media under open circuit conditions at pH 3 and 6. These interactions are probed by Auger electron (AES), X-ray photoelectron, and energy dispersive X-ray spectroscopies, as well as scanning electron…
The self-assembly reaction of the monomeric nest-shaped cluster [NEt4]2[MoOS3Cu3I3] 1 or twin nest-shaped cluster [NEt4]4[Mo2O2S6Cu 6I6] 2 with the bridging ligand 4,4′-bipyridine (4,4′-bipy) gave a 2D polymeric cluster {[NEt4]- [Mo2O2S6Cu6I3(4,4 ′-bipy)5]·MeOH·H2O} n 3, which exhibits a significant improvement of opt…
Two decanuclear cyclic Cr(III) complexes have been synthesised in high yield by solvothermal techniques: magnetic susceptibility studies reveal ferromagnetic Cr⋯Cr exchange in one, and antiferromagnetic Cr⋯Cr exchange in the other.
Sol–gel polymerization of tetraethoxysilane (TEOS) was carried out in the organogel phase consisting of cholesterol-based gelators (neutral 1 and cationic 2). TEOS polymerization in neutral 1 + MeCO2H gel resulted in the conventional granular silica whereas that in cationic 2 + MeCO2H gel yielded the novel mesoporous…
The merging of the main and the secondary dielectric relaxations in a series of six polymers has been investigated by using broadband dielectric spectroscopy (10 -2 −10 9 Hz). The data have been analyzed in two different ways. In one case, the whole relaxation process has been modeled by the simple addition of the rel…
Functionalized SBA-15 type materials containing mercaptopropyl groups have been used for controlling the growth of gold(0) nanoparticles from HAuCl4 or AuCl(THT) which were chemically complexed within the channels prior to mild chemical reduction.
The formation of an elaborate H-bonding network between heptanuclear cations, consisting of a hexacyanochromate capped by six [Mn(dmptacn)]2+ moieties, and hexacyanochromate counterions results in the assembly of novel 1-D chains with short-range ferrimagnetic behaviour occurring between the S = 27/2 clusters and S =…
The cracking behavior of nitrogen-rich hard alpha anomalies in Ti-6A1-4V is examined for partially validating predictive approaches used in life management of high energy rotors. Both synthetic and naturally occurring anomalies were subjected to static and fatigue loading. An internal defect, completely surrounded by…
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Laser cladding using Al–30%Si alloy powder was applied to AZ91D alloy in order to improve its wear resistance. Area fractions of Mg2Si and Mg17Al12 compounds with relatively high hardness in the cladding layer with a width of 4 mm and a depth of 1.5 mm increase with an increase in powder feeding rate, resulting in hig…
Electronic structure of incipient ferroelectric CaTiO3 has been studied from the full potential linearized augmented plane wave method(FLAPW). To understand the incipient ferroelectricity of CaTiO3, the total energy, the density of states, and band structure have been obtained. From the total energy analysis, we found…
Order, order, order! Ferromagnetism and the Curie temperature were explained by Weiss in terms of a huge internal ‘molecular field’ proportional to the magnetization. The theory is applicable both to localized and delocalized electrons. No such magnetic field really exists, but it is a useful way of approximating the…
As a study in a series to investigate the effect of anodized coating on fatigue strength of aluminum alloys, repeated tensile fatigue test was conducted in laboratory air and at room temperature under the stress ratio of 0.01 using smooth plate specimen of A2014-T6 and A6151-T6 with anodized film thickness of 3μm. Fat…
In the process of growing crystals in solutions, double diffusive convection due to thermal and solutal gradients occurs. A measurement system comprising a rapid heat-transfer control system and an accurate real-time phase-shifting interferometer has been developed to investigate the transient double diffusive convect…