Materials Literature
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We examined the evolution of the oxidation state and atomic structure of V in nanophase V 2 O 5 aerogel and ambigel cathodes under in situ conditions using X-ray absorption spectroscopy (XAS). We show that the oxidation state of V in V 2 O 5 aerogel and ambigel cathodes heated under vacuum (100 μTorr) at 220°C for 16…
Ion-exchange of ZSM-5-type zeolites with copper ion was carried out by three different methods to obtain information on the states and roles of the effective sites for NO decomposition and N2 adsorption activity of copper-ion-exchanged ZSM-5-type zeolites (CuZSM-5). The first method of preparation is chemical vapour d…
A bis(alkyl) substituted, asymmetric polyoxometalate [[CH3(CH2)3]4N]4[[CH3(CH2)11Si]2OSiW11O39], was prepared and incorporated into monolayer and multilayer thin films using Langmuir-Blodgett techniques.
This study investigates the potential of Pluronics for the formulation of tetrapyrrole-based photosensitizers, with a particular focus on B-ring benzoporphyrin derivatives. The B-ring derivatives have a high tendency to aggregate in aqueous solutions, and this poses a significant formulation problem. Pluronics are ABA…
Microstructures and mechanical properties of porosity-graded Ti compacts were investigated in this study. To fabricate the porosity-graded compacts, Ti powders with three different particle sizes, 65, 189 and 374 μm were prepared by the plasma rotating electrode process (PREP) and the gas atomization process, and thes…
Sitepu et al. (Sitepu, H., Schmahl, W.W., Khalil Allafi, J., Eggeler, G., Dlouhy, A., Reinecke, T., Brokmeier, H.G., Tovar M. and Többens, D.M. (2002b). Texture and quantitative phase analysis of aged Ni‐rich NiTi using X‐ray and neutron diffractions. Materials Science Forum , 394‐395, 237‐240.) showed that Rietveld r…
The performance of solid-oxide fuel cells (SOFCs) with Cu-ceria yttria-stabilized zirconia anodes in n -butane at 973 K has been studied as a function of fuel conversion. In order to simulate the local anode environment at high fuel utilization, n -butane was oxidized with in a separate reactor before sending the fuel…
Al-Cu-Fe alloys were prepared by mechanical alloying starting from elemental powders in a high-energy planetary ball mill. Three different alloy compositions with the same c Cu : c Fe ratio of 2:1 but different aluminium contents, that is Al55Cu30Fe15, Al63Cu25Fe12 and Al70Cu20Fe10, were investigated. A sequence of so…
In order to improve the environmental resistance of a polymer-derived SiC-fiber-reinforced SiC matrix composite (SiC/SiC composite), allylhydridopolycarbosilane (AHPCS) was utilized as the matrix precursor with Tyranno-SATM fiber. AHPCS showed higher densification efficiency in both intra- and interbundle areas than p…
Geometrical considerations combined with detailed atomic modeling are used to define general classes of diamond/carbon nanotube interface structures with low residual stresses and no unsatisfied bonding. Chemically and mechanically robust interfaces are predicted, supporting recent experimental studies in which struct…
Differences in molecular properties of celluloses from different biological origins were investigated chiefly in terms of the rheological properties of their solutions in 8 wt % LiCl/N, N-dimethylacetamide (DMAc). Cotton linter (CC) and dissolving pulp (DP) were used as cellulose samples derived from plant, and a cell…
This article studies the scattering of electromagnetic waves by a nonmagnetic biperiodic structure. The structure consists of anisotropic optical materials and separates two regions with constant dielectric coefficients. The time harmonic Maxwell equations are transformed to an equivalent strongly elliptic variational…
The mechanical and electrical properties of a bulk material made of single wall carbon nanotubes (SWNT) are, due to weak intermolecular interaction, several orders of magnitude lower than those of the individual molecules themselves. We studied the effect of gamma‐irradiation on SWNT paper in air and under vacuum. For…
Copper nanorods were synthesized using controlled-current electrochemical methods. The surfactants in the electrolyte served as both a templates and stabilizers during the synthesis procedure. TEM images show that the products consist mainly of nanosized rod-like structures. The current density applied during the elec…
A reconstituted collagen membrane from human amnion has been investigated as a source of collagen matrix, which could be used as a substratum for culturing human fibroblasts. The suitability of pepsin-solubilized reconstituted human amniotic membrane, before and after cross-linking with chitosan, as a dermal matrix fo…
Transient absorption spectrometry of Cu(I)-phenanthrolines in CH2Cl2 reveals ligand-independent dynamic processes lasting 15 ps, which are associated with the peculiar structural rearrangements occurring for this class of compounds upon photoexcitation.
A novel N3ArO-calix[6]arene-based system is presented. It allows the formation of an aryloxy radical bound to a metal ion (CuII or ZnII) that presents a free coordination site in a concave cavity. Its oxidative activity appears highly controlled by the supramolecular system hence providing a good model for radical enz…
Certain commercial aluminum alloys exhibit electrochemical activation in chloride media as a result of heat-treatment above 350°C. Activation is manifested by a significant negative shift in the corrosion potential and a significant increase in the anodic current output when polarized above the corrosion potential. Th…
Antimony nanotubes with inner diameters of 15–80 nm, wall thickness of 10–30 nm and lengths of up to several micrometers have been successfully prepared by a rational complexing-reduction route using zinc powder as reductant at low temperature (80–140 °C).
Abstract During membrane and thermal desalination, the saline solution becomes supersaturated. Once the solution becomes unstable, nucleation and crystallization of the salts occur resulting in a buildup of an unwanted deposit layer on transfer surfaces and increasing the mass‐ or heat‐transfer resistance of the syste…