Materials Literature
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The addition of enough non-adsorbing polymer to a hard-sphere suspension causes the particles to aggregate to form a space-filling gel. The integrity of the gel persists for a finite period of time, and then the space-filling structure collapses suddenly to form a denser sediment. This phenomenon of ‘delayed sedimenta…
In the selective catalytic reduction (SCR) of NO by ammonia, over-exchanged Fe-ZSM-5 prepared by sublimation of FeCl3 into H-ZSM-5, shows superior catalytic activity and stability in a wide temperature range; its activity is promoted by the presence of water in the feed while SO2 is a weak poison at low but a promoter…
A powder sintering method was used to synthesize the intermetallic compounds LaCaMgNi 9 , CaTiMgNi 9 , LaCaMgNi 9 Al 3 , and LaCaMgNi 6 Mn 3 ( PuNi 3 ‐ type ) . The microstructure and primary phases were observed by scanning electron microscopy and X‐ray diffraction. The pressure‐composition isotherms showed that all…
The behavior of the magnetic-field and temperature-dependent heat capacity $C(H,T)$ and the magnetocaloric effect $\ensuremath{\Delta}T(\ensuremath{\Delta}H,T),$ in the vicinity of magnetic phase transitions is discussed. A simple model allowing calculation of the peak value of the magnetocaloric effect is developed f…
The reaction of pyridine-2,6-dimethanol (H2pdm) with [Mn3O(O2CMe)6(py)3][ClO4] gives the 2MnII, 2MnIII title compound 1, which has an S = 8 ground state and displays strong out-of-phase signals in ac susceptibility studies that establish 1 as a new class of single-molecule magnet.
Two simple methods for chemically modifying boron‐doped diamond (BDD) films by oxidative treatment were examined. These treatments have shown promise in imparting selectivity to BDD electrodes, for example, between dopamine and ascorbic acid (AA). BDD surfaces were treated either by oxygen plasma or anodic polarizatio…
An analysis of the conformational properties and hydrogen bonding in the condensed phases of glycerol is reported using the same model as adopted in Part I (Phys. Chem. Chem. Phys., 1999, 1, 871). Structural properties of the liquid and glassy states are analyzed in relation to the molecular backbone conformation of t…
Description Features the most current research from an international body of leading experts on how radiation impacts the microstructure and mechanical properties of a wide range of metals. This comprehensive publication includes 71 peer-reviewed papers organized into the following key areas: • radiation damage mechan…
We have fabricated epitaxial single crystalline cobalt ferrite (CoFe2O4) thin films on CoCr2O4 buffered SrTiO3 and MgAl2O4 substrates. Structural characterization by X-ray diffraction, Rutherford backscattering spectroscopy and atomic force microscopy indicates excellent crystallinity. Magnetic anisotropy measurements…
We describe a new quantitative electrochemical technique for measuring the copper redistribution that occurs during corrosion and pretreatment of high‐strength copper‐containing aluminum alloys. Underpotential deposition (upd) of Pb on Cu was used to assay the surface coverage of Cu. Model experiments using samples of…
Most of the silicone materials used for Hv outdoor insulation are high-consistency, heat cured polydimethylsiloxane (PDMS) elastomers. The unique properties of PDMS that make it suitable for HV applications are reviewed. The surface of these elastomers can be rendered hydrophilic by exposure to discharges. A time and…
Flow reactor experiments were performed over wide ranges of pressure (0.5–14.0 atm) and temperature (750–1100 K) to study H2/O2 and CO/H2O/O2 kinetics in the presence of trace quantities of NO and NO2. The promoting and inhibiting effects of NO reported previously at near atmospheric pressures extend throughout the ra…
Relaxations in a soft-sphere glass are studied by molecular dynamics. We observe local jumps where groups of ten and more atoms move collectively forming chainlike structures. At the lowest temperatures the total jump length is of the order of the nearest neighbor distance whereas a single atom moves only a fraction o…
A modified Allen-Cahn equation is combined with the compressible Navier-Stokes system. We show that, after a modification of the stress tensor, the second law of thermodynamics is valid for the resulting equations. We give a physical motivation of this alteration of the stress tensor and compare the new equations with…
The domain configuration of rhombohedral PZN-8%PT single crystals has been observed as a function of electric-field and crystallographic orientation using polarizing microscope. Although a single domain state could be achieved by applying an E-field along the rhombohedral polar direction [111], a multidomain state was…
Fourier transform infrared spectroscopy (FT-IR) and X-ray diffraction patterns were used to analyze the mineral structure and organic matrix composition and thermal behavior of the internal nacreous layer (mother of pearl or nacre) of the shell of the giant oyster Pinctada maxima. Nacre is a natural biomaterial with o…
The effect of the crystallinity of boehmite powders on the temperatures of γ-Al 2 O 3 formation and the θ- to α-Al 2 O 3 transformation was investigated using boehmite powders of varying crystallite size prepared under various hydrothermal conditions. With increasing crystallite size of the boehmite powders, the speci…
The multilayer relaxation at (100), (110), (111), (210), (211), (310), (311) and (331) surfaces of the fcc metals Cu, Ag, Au, Ni, Pd, Pt, Al and Pb are calculated using the modified embedded atom method. The `anomalous' outward relaxation at Al (100), (111), Pt (111), and Cu (111) surfaces is described correctly. The…
An appraisal of on-line monitoring techniques to detect airgap eccentricity in three-phase induction motors is presented. On-line current monitoring is proposed as the most applicable method in the industrial environment and a novel analysis strategy is explained. The practical details of on-site case histories and an…
Chemically directed assembly of nanoscale materials is often an attractive alternative to techniques such as chemical vapor deposition or lithography. In this paper the synthesis of one-dimensional (1D) assemblies of solid poly(pyrrole)—the Figure shows a transmission electron microscope image—and the use of metal nan…