Materials Literature
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Polycrystal gadolinium lithium fluorides (GdLiF4=GLF) have been investigated as magnetic materials for an adiabatic demagnetization refrigeration (ADR) system operating at 4 K. Because of difficulties in growing a single crystal of GLF, a polycrystalline sample was fabricated and investigated. The relative density of…
This paper describes the design, modeling, initial build and testing of a novel thermoelectric power generator (TPG), incorporating state of the art material technology with optimized thermal management. A numerical model simulates the operation of the device and facilitates its design. Advanced multi-parameter, gradi…
Abstract The reaction of organoalkoxysilanes with sodium hydroxide was studied in detail. Studies indicate that this reaction involves more than one stage and involves rather complex multistep process, which leads to the formation of both monosodiumoxyorganoalkoxysilanes (MSOAS) and several secondary products. Analysi…
Abstract The use of photoresponsive hexatriene architectures to regulate chemical reactivity is described. The major focus of this report is how the two isomers of dithienylethene derivatives exhibit different steric and electronic properties. The ring-open form is structurally flexible, and the thiophene rings are el…
The synthesis and characterization of six symmetrical mesogenic dimers composed of bent-core molecules containing alkylene spacers are reported. The mesophase was characterized by polarizing optical microscopy, differential scanning calorimetry, X-ray diffraction and electric field experiments. The X-ray diffraction s…
Nanocrystalline niobium with a grain size of the order of magnitude of 100 nm has been produced by the method of severe plastic deformation (high-pressure torsion). The evolution of its structure at various annealing temperatures in the range of 400–800°C has been studied using transmission electron microscopy. It has…
Data on the synthesis and properties of NASICON complex phosphates M x A2(PO4)3 are summarized. The crystal chemistry and homology of these compounds are surveyed. The existence of large channels and numerous voids in the structure and various occupations of these voids by mobile cations generate many valuable physica…
We report a study of the effect of optical absorption on generation of coherent infrared radiation from mid-IR to THz region from GaSe crystal. The infrared-active modes of epsilon-GaSe crystal at 236 cm(-1) and 214 cm(-1) were found to be responsible for the observed optical dispersion and infrared absorption edge. B…
The oxidation of 1-octanethiol to corresponding disulfide as a model reaction for mercaptan sweetening was examined on the bifunctional catalysts prepared by supporting cobalt phthalocyanine tetrasulfonate (CoPcTs) on mixed-oxide solid bases (designated as Mg(Al)O) derived from thermal decomposition of Mg–Al hydrotalc…
A copolymer of diarylethene and trimethylsilyl-substituted p-phenylene vinylene (TPV) was synthesized to achieve photo-induced electrical change in a solid medium. The photo-isomerization of the polymer was induced by incorporating a 2,3-bis(2-methylbenzo[b]thiophen-3-yl)hexafluorocyclopentene (BTF) unit, while TPV un…
Understanding the elastic and plastic deformation properties of nanostructured metals requires the development of in situ testing methods that can follow the footprints of the deformation mechanism(s) during mechanical testing. Here we present an in situ synchrotron x-ray-diffraction technique which allows the measure…
Guest molecules of diethyl ether or methanol are reversibly encapsulated in cavities formed by the 3-dimensional supramolecular framework of heteropolynuclear, luminescent [Eu2Zn4L4(OAc)6(NO3)2(OH)2].2Et2O.
All of the copper in the layered oxysulfides Sr2MnO2Cu1.5S2 and Sr2MnO2CU3.5S3 may be extruded as the element and the copper ions replaced quasi-reversibly by lithium ions in reductive topotactic ion exchange reactions; dramatic changes in magnetic properties result.
The effect of microwave radiation on polymer microcapsules containing inorganic nanoparticles has been studied. The samples were exposed to 2.45 and 8.208 GHz microwaves of variable power. The data of scanning electron microscopy show that the character of microwave action upon polymer microcapsules depends on their c…
Reduction of friction at very low normal loads and for very small contact areas is important for the development of micro devices. High performance hard coatings such as diamond-like carbon (DLC) films and improved surfaces with nanostructures are being investigated with respect to their friction reduction properties.…
CeO2 based materials are promising candidates as solid oxide electrolytes within fuel cell systems. In this capacity, the oxygen anion conductivity is pivotal. Sata et al. [Nature, 2000, 408, 946–949] demonstrated the ability to ‘fine tune’ conductivities in BaF2 and CaF2 by generating BaF2/CaF2 heterolayers with diff…
Mesoporous MgAl2O4 spinel monolith was synthesized by the nanocasting pathway; high activity in CO oxidation was observed over gold catalysts based on such monoliths as support.
The novel gadolinium(III) containing compounds (CH3NH3)2[Gd2(CCl3COO)6(H2O)6](CCl3COO)2.2CCl3COOH (1) and (NH3CH3)2[Gd4(OH)4(CCl3COO)10(H2O)6].2H2O (2) were synthesized and structurally characterized by X-ray crystallography. In the crystal structure of 1 the gadolinium ions are bridged by carboxylate groups to dimers…
A novel preceramic polymer suitable to form a SiBCN ceramic was synthesized by hydroboration reaction of 1,3,5-trivinyl-1,3,5-trimethyl-cyclotrisilazane with borane dimethylsulphide. The obtained polymer denoted as poly(borosilazane) was characterised by FT-IR and NMR spectroscopy and its thermal stability was studied…
Low-oxygen-content Si-C fibers (Hi-Nicalon) with 0.5 wt% oxygen were prepared from polycarbosilane with electron beam irradiation curing and pyrolysis. The thermal stability of the Hi-Nicalon fibers was significantly improved compared to Si-C-O fiber (Nicalon) with 12 wt% oxygen. However, creep deformation occurred in…