Materials Literature
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For high-temperature thermoelectric power generators, single-crystal-like polycrystals of misfit-layered cobaltites were fabricated using an in situ topotactic conversion of aligned “reactive seed” platelet particles and the highly textured ceramics exhibited strong anisotropy with improved electrical conductivity.
The methods of coordination chemistry are extended to fabricate hollow spheres of inorganic materials. In particular, in the present work a novel approach is successfully put forward to synthesize ZnO submicrometer hollow spheres, in which the coordination polymer [Zn(4,4′-bipy)(NCS)2]n with a 1D chain structure is in…
In the work reported in this paper, we demonstrate that Ag+–Keggin ion colloidal particles are excellent templates for the synthesis of organized assemblies of silver nanoparticles, wherein the Keggin ion host plays the role of a UV-switchable reducing agent. More specifically, we investigate the formation of aqueous…
Free base porphyrin molecules form well-defined and ordered nanoclusters in mixed solvents with absorption characteristics that significantly differ from those of the monomer form. These self-assembled crystallites in acetonitrile/toluene (9 ∶ 1, v/v) can be deposited as thin films on a nanostructured TiO2 electrode u…
Abstract Polyoxometalates (POMs) nanorods, hollow particles, microtubes, and 3D‐ordered tube systems were prepared using a novel and simple PEG/H 2 O liquid system. POM nanorods with various diameters (30−400 nm) and lengths (500 nm to 2 μm) were produced in a well‐controlled manner. (© Wiley‐VCH Verlag GmbH & Co.…
Double-walled carbon nanotubes (DWNTs) were prepared using floating chemical vapor deposition by adding a small amount of sulfur into the catalyst. The outer diameter of the DWNTs is from 1.5 to 3 nm. Raman study on DWNTs shows that the interlayer distance between the inner and outer tubes varies from 0.33 to 0.41 nm.…
Ultrafine-grained steel bars with a cross section of 18 mm square were fabricated through a multi-pass warm caliber-rolling for a 0.15%C-0.3%Si-1.5%Mn steel. The average ferrite grain sizes of 0.43 μm, 0.70μm and 1.2μm were obtained in the isothermal rolling processes at 773K, 823K and 873K, respectively. Despite of i…
The hydrothermal reaction of the mixture of K2WO4·2H2O, CuSO4·5H2O, ethylenediamine and H2O at 170 °C for 72 h yields purple needle-like crystals of [Cu(en)2]3[{Cu(en)2}2(H2W12O42)]·12H2O. Single crystal X-ray diffraction reveals that the structure consists of one-dimensional [{Cu(en)2}2(H2W12O42)]n6n− anions with dis…
Aiming at developing a dental titanium alloy with better mechanical properties and machinability than unalloyed titanium, a series of Ti-Nb alloys with Nb concentrations up to 30% was made. They were cast into magnesia-based molds using a dental casting machine and the mechanical properties and grindability of the cas…
Two different strategies for the synthesis of t-selenium nanorods and nanowires are described, wherein the solution based method involves a reaction of selenium powder with NaBH4 while the other employs the thermal decomposition of [(CH3)4N]4Ge4Se10.
The effect that synthesis procedures have on the performance of (yttria-stabilized zirconia) anodes for solid oxide fuel cells (SOFC) has been investigated. Using a fixed concentration of 20 wt % Cu and 10 wt % impregnated into a porous YSZ matrix using metal salts, it is shown that the methods used to prepare and Cu…
A non-steroidal anti-inflammatory drug (ibuprofen) has been anchored inside the mesoporous channels of MCM-41-type silica and on a silica gel surface. The relevant anchoring procedure through an ester function has been investigated. It uses the epoxide ring opening of 3-glycidoxypropylsilane grafted on the silica surf…
In this paper, the Phase Change Random Access Memory (PRAM, also known as Ovonic Unified Memory-OUM) cell, which has an extremely small and reproducible contact area and improved thermal environment, was fabricated and electrically characterized. The memory cell successfully operates with 30 ns pulses of 0.20 mA for R…
We discuss the use of nitric oxide (NO) gas to dope ZnO p-type films, fabricated using metallorganic chemical vapor deposition (CVD) reaction of a Zn metallorganic precursor and NO gas. In this reaction, NO gas is used to supply both O and N to form a N-doped ZnO (ZnO:N) film. Auger electron spectroscopy analysis indi…
Some principles of current distribution within recesses that were developed last century by Carl Wagner are a basis for understanding crevice corrosion that occurs by the recently proposed (1985) so-called IR mechanism, where I is the ionic current flowing out of the crevice or pit, and R is the resistance of the crev…
The plasma display panel (PDP) as a medium of large format TV is gaining attention due to its high performance and scalability. The performance and life, or stability, of a PDP is strongly related to the nature of phosphors. Life and persistence are the main concerns in Mn-activated zinc silicate and barium-aluminate-…
Ce–Pr–O mixed oxides prepared by coprecipitation and calcined at 1173 K reveal a non stoichiometric structure with oxygen vacancies in the bulk. In situ XRD and Raman spectroscopy were used to investigate these properties simultaneously and identified a thermal expansion coefficient twice as high as that of pure ceria…
Protein kinases play key roles in signal transduction and therefore are among the most attractive targets for drug design. The pharmacological aptitude of protein kinase inhibitors is highlighted by the observation that various diseases with special reference to cancer are because of the abnormal expression/activity o…
An unusual trinuclear iron(III) cluster described herein, [Fe3(μ3-O)(μ2-CH3COO)6(C5H5NO)2(H2O)] ClO4·4H2O (1) (C5H5NO = 2-pyridone), features a cyclic hydrogen bonded supramolecular water tetramer at one of the iron centres, as characterized by X-ray crystallography and thermogravimetry. The water cluster is formed by…
The complexation of palladium(II) by a unique family of [2+2] diiminodipyrromethane macrocycles yields compounds that adopt structures reminiscent of Pac-Man porphyrins.