Materials Literature
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Two types of optical recording crystalline material Ge 2 Sb 2 Te 5 have been studied by neutron and X-ray powder diffraction measurements. One is the crystalline cubic-phase Ge 2 Sb 2 Te 5 . The other is nanocrystalline-phase Ge 2 Sb 2 Te 5 . In the former, a large atomic displacement of germanium atoms was found by t…
Exfoliation corrosion (EFC) of AA7178 (UNS A97178) has been quantitatively studied using the exfoliation of slices in humidity (ESH) test, which measures exfoliation layer thickness of the specimens as a function of time in a humid environment after an electrochemical pretreatment. The effects of relative humidity (RH…
High-pressure phase stabilities of the CaSnO 3 system were investigated using density functional theory static lattice energy calculations. We have identified six phase changes in this system: perovskitepost-perovskite, post-perovskite-B2+cotunnite in CaSiO 3 , B1-B2 in CaO, cassiterite-pyrite, pyriteorthorhombic-I, a…
Perovskite-type La 1- x Bi x MnO 3 (LBMO) crystals, which were prepared by doping a Bi atom for a La atom in LaMnO 3 , were shown to exhibit the colossal magnetoresistance (CMR) effect. Samples were produced by sintering in an air atmosphere that depended on the Bi composition ratio x . X-ray diffraction measurements…
Single-walled carbon nanotubes (SWCNTs) were directly synthesized by a hydrogen arc-discharge method by using only Fe catalyst. The synthesized carbon materials indicated high-purity SWCNTs without amorphous carbon materials from SEM observation. The SWCNTs had diameters of 1.5-2.0 nm from TEM and Raman observation. A…
This paper summarizes the mechanical properties of recently developed Oxide Fiber Composites (OFCs) consisting of high‐strength continuous oxide fibers embedded in an oxide matrix. The OFCs exhibit a favorable combination of high strength and damage tolerance due to unusual homogeneous microstructures. The tensile beh…
RUTH C. BORNER†, RICHARD J. BUSHBY*‡ and ANDREW N. CAMMIDGE§ †Floraroma Ltd., Teddington, Middlesex, TW11 8EE, UK ‡Centre for Self‐Organising Molecular System (SOMS), University of Leeds, LS2 9JT, ...
Abstract Polymer/layered filler nano-composites (PLFNCs) offer remarkably improved mechanical properties with low inorganic filler loading. Major developments in this field have been carried out over the last one and half decades. However, we are far from the goal of understanding the mechanisms of the enhancement eff…
We report the characterization of 3 new repetitive sequences from the bivalve mollusc Mytilus galloprovincialis, designated Mg1, Mg2, and Mg3, with monomer lengths of 169, 260, and 70 bp, respectively. The 3 repeats together constitute approximately 7.8% of the M. galloprovincialis genome and were found, together with…
Abstract Summary: An O ‐hexyl‐3,5‐bis(terpyridine)phenol ligand has been synthesized and transformed into a hexagonal Zn(II)‐metallomacrocycle by a facile self‐assembly procedure capitalizing on terpyridine‐Zn(II)‐terpyridine connectivity. The structural composition was confirmed by NMR and mass spectral techniques; p…
The influence of source conditions on vanadium-carbon cluster formation in a methane-vanadium plasma is explored and analyzed by photoelectron spectroscopy, revealing that the metal-carbon ratio has substantial influence over the cluster products. Experiments that employ large methane content produce carbon-rich mono-…
Complete oxidation of ethylene was performed over supported noble metals or transition metals oxide catalysts and on monoliths under atmospheric pressure. Gold nanoparticles on Al2O3 or MxOy(M = Mo, Fe, Mn) were prepared by impregnation, coprecipitation, deposition, and dispersion methods. Nanoparticles prepared by im…
Hydrogenated and unhydrogenated Si-nanocrystal/Si dioxide (Si-nc/SiO2) composites were obtained from SiyO1-y(y=0.36,0.42) thin films deposited by plasma-enhanced chemical vapor deposition. The unhydrogenated composites were fabricated by promoting the Si precipitation through the thermal annealing of the films in the…
Abstract: The surface of mercapto-functionalized mesoporous silica having a highly ordered open pore net-work was modified into a super-hydrophilic surface through a stepwise sulfonation process involving oxida-tion and ionization reactions. The initial mesoporous silica was prepared using an acid-catalyzed sol-gel re…
Abstract A new approach for the preparation of organic/inorganic nanocomposites was investigated in which nano‐sized silica particles without surface modification were dispersed by the mechanical smashing of strength‐controlled porous silica agglomerates in molten resin during direct melt‐compounding. The method consi…
Electron beam-induced deposition (EBID) provides a simple way to fabricate submicron- or nanometer-scale structures from various elements in a scanning electron microscope (SEM). The growth rate and shape of the deposits are influenced by many factors. We have studied the growth rate and morphology of EBID-deposited n…
The mesomorphic behavior and phase structure were examined in the mixture of two kinds of dimeric compounds, alpha,omega-bis(4-alkoxyanilinebenzylidene-4'-carbonyloxy)pentane (mOAM5AMOm), by optical microscopy, X-ray diffraction, polarization switching, and second-harmonic generation measurements. One compound is 4OAM…
The kinetics of assembly of a series of poly(2-vinylpyridine)−polystyrene−poly(2-vinylpyridine) (PVP- b -PS- b -PVP) triblock copolymers from the selective solvent toluene onto a silicon surface has been studied using phase-modulated ellipsometry. The adsorbed amount and thickness have been determined independently as…
Narrow W lines with linewidths down to ~40 nm were manufactured by both damascene and subtractive processing. The dependence of the resistivity on the linewidth was studied for different deposition temperatures of the W layer. Generally, the resistivity decreases for decreasing deposition temperature of W. The resisti…
The thermoelectric properties of doped half-Heuslers, NbCoSn 1- x Sb x and Nb 0.99 Ti 0.01 CoSn 1- x Sb x , have been studied in the temperature range from 320 to 850 K. These half-Heuslers are synthesized by the arc melting of pure metals followed by annealing for one week at 1123 K in vacuum. The samples with x =0,…