Materials Literature
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Partial table of contents: Fluorocarbon Elastomers (V. Arcella & R. Ferro). Processing of Fluoroelastomers (S. Bowers). Adhesion Properties of Fluoropolymers (D. Brewis & I. Mathieson). Ethylene-Tetrafluoroethylene Copolymer Resins (D. Kerbow). Fluorosilicones (M. Maxson, et al.). Liquid Fluoroelastomers (E. Ross & G.…
Research Article| January 01, 1997 Melting experiments on lherzolite KLB-1 under hydrous conditions and generation of high-magnesian andesitic melts Kei Hirose Kei Hirose 1Department of Earth and Planetary Sciences, Tokyo Institute of Technology, Ookayama, Tokyo 152, Japan Search for other works by this author on: GSW…
In waste water treatment processes microorganisms are subjected to a feast and famine regime. For sequencing batch processes this is often even more pronounced. Based on literature reports and own research it is hypothesized that in general microorganisms respond to these feast-famine regimes by accumulating storage p…
Large, hard, transparent, mesoporous silica spheres are synthesized in one step by using oil-in-water emulsion chemistry under basic conditions with cationic surfactants and (n-BuO)4Si. The pores are shown by TEM and nitrogen absorption studies to be monodispersed in size, with total surface area over 1000 m2/g.
The properties of amorphous carbon (a-C) deposited using a filtered cathodic vacuum arc as a function of the ion energy and substrate temperature are reported. The sp3 fraction was found to strongly depend on the ion energy, giving a highly sp3 bonded a-C denoted as tetrahedral amorphous carbon (ta-C) at ion energies…
The effect of porous composite electrodes on the overall charge‐transfer process in solid‐state devices, such as solid oxide fuel cells, is theoretically examined by taking into account various parameters such as electrolyte thickness, intrinsic charge‐transfer resistance, electrode thickness, and porosity. A model is…
The Mg:Ca ratio at which the calcium carbonate mineral that has pseudohomogeneously precipitated from seawater changes from calcite to aragonite was experimentally determined as a function of temperature. Results indicate a dramatic change in the critical Mg:Ca ratio over a relatively small temperature range. For exam…
The range of chemistries used for tanning leather is reviewed; traditional methods of tanning are explained and the newer processes are described. The areas of tanning include: vegetable tanning with plant polyphenols, mineral tanning with metal salts, in particular chromium(III), oil and aldehyde tannages, synthetic…
An investigation of the effect of trapped space charges on the aging of polymeric insulating materials subjected to thermo-electrical stress is reported in this paper. Possible scenarios of degradation mechanisms, thermally activated, but accelerated by the presence of space charges, are examined. The model which deri…
Modelling and calculations are presented as a first step towards mechanistic interpretation and prediction of radiation effects based on the spectrum of initial DNA damage produced by low energy electrons (100 eV-4.5 keV) that can be compared with experimental information. Relative yields of single and clustered stran…
The last twenty-five years has seen enormous advances in both our imderstanding of liquid crystals and our ability to use them in applications.Early on during this period, it was possible for a person working in the field to be aware of most of the results, both pure and applied.Midway through this period, it was stil…
Covalently linked chromophore–quencher complexes are widespread in the area of transition-metal photochemistry and as models for photosynthesis. This review surveys recent examples of supramolecular complexes in which interacting chromophore and quencher fragments are instead held together by non-covalent interactions…
The thermoelectric properties of a mixed oxide (Zn 1-x Al x )O (x=0, 0.005, 0.01, 0.02, 0.05) are investigated in terms of materials for high-temperature thermoelectric conversion. The electrical conductivity, σ, of the oxide increases on Al-doping by more than three orders of magnitude up to ca. 10 3 S cm -1 at room…
We present calculations of head to head domain wall structures in magnetic strips of Ni/sub 80/Fe/sub 20/ with widths, w, ranging from 75 nm to 500 nm and thicknesses, t, from 1 nm to 64 nm. Neglecting magnetocrystalline and magnetostrictive anisotropy energies, minimization of exchange and magnetostatic energy leads…
Nitrogen adsorption measurements were performed over a wide range of relative pressures (10 -6 −0.995) for a series of siliceous MCM-41 samples obtained using alkyltrimethylammonium surfactants with different chain length. Both high- and low-pressure adsorption data were analyzed. The pore size was shown to increase i…
The phase behavior of organically passivated 20−75 Å diameter Ag and Au nanocrystals is investigated by examining surface−area isotherms of Langmuir monolayers and transmission electron micrographs of Langmuir−Blodgett (LB) films. The effects of temperature, organic passivant chain length, and nanocrystal size and com…
Multilayer superlattices incorporating colloidal metal nanoparticles have been synthesized by an approach based on self‐assembly. Teh method of synthesis is described and the results are presented from X‐ray reflectivity measurements, optical spectroscopy, and various microscopies, showing that they provide a consiste…
Electroluminescence and liquid crystallinity : these are the properties of a new spacerless conjugated main‐chain liquid‐crystalline (LC) polymer reported here. The thermal and spectroscopic properties of the new glass‐forming poly‐fluorene with octyl side chains (see Figure) are described, showing that polarized elec…
The oxidation kinetics of CVDSiC were monitored by thermogravimetric analysis (TGA) in a 50% H 2 O/50% O 2 gas mixture flowing at 1.4 cm/s for temperatures between 1200” and 1400°C. Paralinear weight change kinetics were observed as the water vapor oxidized the SiC and simultaneously volatilized the silica scale. The…
This paper deals with recent and important developments in the field of organic materials for second-order nonlinear optics. Attention is drawn to current trends in chromophore design with a discussion of current progress and problems in this field. A number of important classes of chromophores, such as one-dimensiona…