Materials Literature
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The purpose of this investigation was to assess the applicability of the metastable equilibrium solubility (MES) concept, previously developed in our laboratory, over wide ranges of two independent variables, carbonate content and crystallinity, and also to examine the influences of these variables on the MES behavior…
The stoichiometry of a series of low pressure chemical vapor deposition deposited SiOx films was determined using x-ray photoelectron spectroscopy (XPS) by two different methods. The first, more traditional, method involved applying relative sensitivity factors to the integrated O 1s and Si 2p peaks, taking into consi…
Dynamical correlations of charged rodlike colloidal particles interacting via a Yukawa segment-segment potential are investigated using extensive Brownian dynamics computer simulations. The model and the parameters used in the simulations are particularly designed for aqueous suspensions of tobacco-mosaic viruses. Ove…
An off-lattice random-flight simulation procedure is described which accurately predicts the obstruction factors for self-diffusion of small molecules in macrofluids. The simulation procedure, employing a continuous step length distribution that ensures rapid and accurate convergence, was validated by comparison with…
The adduct of zeolites in intumescent formulations of thermoplastic polymers (additives: ammonium polyphosphate and pentaerythritol) leads to a great improvement in their fire retardant performance. A classification of different groups (A, X, Y, Mordenite and ZSM-5) is presented. The influence of the physicochemical p…
Friction and wear of sintered alumina with grain sizes between 0.4 and 3 μm were measured in comparison with Al 2 O 3 /TiC composites and with tetragonal ZrO 2 (3 mol% Y 2 O 3 ). The dependence on the grain boundary toughness and residual microstresses is investigated, and a hierarchical order of influencing parameter…
The strength and fracture of a directionally solidified Y 3 Al 5 O 12 /Al 2 O 3 eutectic fiber were investigated. The fiber was grown continuously by an edge‐defined film‐fed growth technique. The microstructure was characterized using X‐ray diffraction, scanning electron microscopy, and energy‐dispersive spectroscopy…
The magnitude of local stress applied to a polymer surface in the buffing process, which is a critical method to uniformly align liquid crystals for displays, has been evaluated from the polarizing optical microscopic investigation of nematic liquid crystals in contact with polyimide surfaces which were suitably buffe…
We report the formation of highly oriented rutile titanium dioxide films. Films of a primarily amorphous nature were grown on fused silica by rf reactive sputter deposition using a Ti target and rare gas (Ne or Ar)-O2 discharges. Post-deposition annealing was done at 350–1150 °C in air for 60 minute intervals, followe…
Crystallographic orientation and microstructural changes of ZnO thin films deposited by rf-magnetron sputtering were investigated with changing deposition parameters. Positional dependence of texture orientation and microstructural features, which might be attributed primarily to bombardment of high energetic oxygen s…
The quest for coordination complexes with novel magnetic properties, which may have potentially useful applications in materials science, has focussed attention on superexchange bridges with the ability to propagate ferromagnetic coupling between paramagnetic transition metal centers. The flexi-dentate azide ligand ca…
The initial stages of Cu growth (up to 20 Å) on ordered Al2O3 ultrathin films (∼20 Å thick) synthesized on a Re(0001) substrate are studied by low-energy ion scattering (LEIS) and x-ray photoelectron spectroscopy (XPS). LEIS results indicate that Cu grows as three-dimensional clusters on the Al2O3 films at both 80 and…
Backscattered electron Kikuchi patterns (BEKP) suitable for crystallographic phase analysis can be collected in the scanning electron microscope (SEM) with a newly developed charge coupled device (CCD) based detector. Crystallographic phase identification using BEKP in the SEM is unique in that it permits high magnifi…
<div class="htmlview paragraph">Engine dynamometer testing of homogeneous charge, spark ignition lean burn engines fueled by natural gas, hydrogen/natural gas blends and neat hydrogen was conducted to determine if NO<sub>x</sub> emissions from blended fuel operation can be reduced below those generat…
Natural-fibre-mat-reinforced thermoplastics (NMTs) based on flax fibres and a polypropylene (PP) matrix were manufactured using a film-stacking method. The influence of fibre content on stiffness and strength is reported and compared with data for glass-matreinforced-thermoplastics (GMTs), including the influence of i…
Gold surfaces coated with monolayers of alkyl thiols are significant in the field of biosensors and chromatography. There is a general concern about the quality of coatings in terms of surface density and voids. The self-assembly of the short-chain hexane (C 6 ) thiol and long-chain dodecane (C 12 ) and hexadecane (C…
Abstract The LO and TO phonon frequencies and dampings have been measured by near‐infrared Raman spectroscopy both in bulk GaAs and InP. The phonon damping of the LO phonon in InP is much smaller than the LO phonon damping in GaAs. The experimentally obtained temperature dependences were compared with a theory includi…
We report first- and higher-order Raman scattering from the surface and confined optic phonons in ${\mathrm{CdS}}_{0.65}$${\mathrm{Se}}_{0.35}$ and pure CdS nanoparticles embedded in glass matrix. The average particle sizes and size distribution have been estimated from the quantitative comparison of the blue-shifted…
Abstract We describe the preparation of telechelic OH‐terminated poly[( R )‐3‐hydroxybutyric acid] (PHB) and poly{[( R )‐3‐hydroxybutyric acid]‐ co ‐[( R )‐3‐hydroxyvaleric acid]} (PHB/HV), on a semi‐preparative scale, by a transesterification procedure from the high‐molecular weight polymers. The oligomers have well‐…
We have attempted to clarify the effects of low and high levels of mechanical agitation on the cellulolytic activity of a pure endoglucanase ( EG ) and a total cellulase mixture (TC) on scoured and bleached cotton fabric, along with the effect of EG pretreatment on subsequent treatments with TC. Methods used to follow…