Materials Literature
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Using simulation techniques that we discussed in a previous work, we create random dense hard-sphere systems above the freezing point (i.e., along the metastable branch) and measure key quantities that characterize the structure for such high densities. These include certain statistics of the void space, nearest-neigh…
Changes in hydrogen environments in porous silicon prepared from a p‐type silicon wafer with thermal annealing were studied to make an exact assignment of the infrared absorption spectrum and to clarify the fine structures of hydrogen in porous silicon. Annealing makes it possible to desorb the SiH 3 and SiH 2 states…
In a given casting, the mechanism of grain nucleation affects the subsequent development of the grain structure. Despite being well documented in the literature, the mechanism for the formation of equiaxed grains in the absence of grain refining additions is unclear. Controversy still remains regarding the various the…
Electroabsorption spectroscopy is known to report directly on the changes in dipole moment and molecular polarizability accompanying electronic excited state formation. Because ground-state excited-state dipole moment changes can be equated with effective one-electron transfer distances, experimental electroabsorption…
Carbon dioxide (CO2) corrosion products formed on low-carbon steel test coupons exposed to multiphase flows of CO2-oil-salt water mixtures were analyzed. The effects of flow, temperature, pressure, and fluid composition on formation of these corrosion surfaces also were examined. Type 1018 steel (UNS G10180) coupons w…
Detailed studies of the absorption and storage of hydrogen by icosahedral quasicrystalline Ti-Zr-Ni are presented. Two different absorption methods, one at room temperature and another requiring elevated temperatures, successfully introduce hydrogen into Ti-Zr-Ni alloys. Absorption is accompanied by an expansion of th…
Elastic electron scattering factors of 106 ions are represented in a parameterized form that separates the diverging Coulomb term due to ionic charge from the finite contribution of the remaining screened atomic field. This parameterization is shown to be very convenient for many-beam analysis of electron diffraction…
The sintering and microstructural evolution of nanosized MnZn ferrite powders prepared by a hydrothermal method were investigated. The microstructure of sintered ferrite compacts depends strongly on the strength of the agglomerates formed during the compacting of nanosized ferrite powders. It was found that at 700°C t…
The design of a dedicated station for time-resolved small-angle x-ray scattering/ wide-angle x-ray scattering (SAXS/WAXS) experiments on a bending magnet beamline at the European Synchrotron Radiation Facility (ESRF) is used as an example of a versatile beamline suitable for polymer work. Although it has a relatively…
Ultrafine grain sizes were introduced into an Al-3wt%Mg solid solution alloy and a commercial Al-Mg-Li-Zr alloy through intense plastic straining by equalchannel angular (ECA) pressing at room temperature and at 673 K respectively. Tensile testing of pressed samples at room temperature revealed markedly different stre…
Telomerization of vinylidene fluoride (VDF) with methanol was investigated to synthesize fluorinated telomers bearing a functional end-group. Improvements of the conversion of VDF were attempted by using different radical initiators and reaction processes. The solvent effect on the reaction yield was also studied. Rad…
We present here an extension of the viscoplastic self-consistent (VPSC) polycrystal model for the calculation of the intergranular Cauchy stresses in an aggregate. This method, which is based on the self-consistent treatment of incompressible aggregates proposed in 1987 by Molinari et al , is formulated using the incl…
Polycrystalline copper oxide thin films have been prepared from copper dipivaloylmethanate and oxygen by an atmospheric-pressure chemical vapor deposition method at a reaction temperature of 300°C. The deposition at oxygen partial pressure ( p 0 ) ≦2.13 kPa forms single-phase Cu 2 O with [100] oriented polycrystalline…
Liquid crystalline materials display unique properties which can be exploited in organic light-emitting diodes. Characteristic features of liquid crystals are the anisotropy of electronic properties, a strong coupling to external fields as well as a tendency to form spontaneously homogeneous monodomain films. It is fo…
To define the contributions of changes in cell, matrix compartment, and fibrillar collagen volumes to longitudinal bone growth, we measured the differences in cell, pericellular/territorial matrix and interterritorial matrix volumes, and fibrillar collagen concentrations between the upper proliferative and lower hyper…
A Fourier transform infrared (FTIR), UV−vis, and high-resolution transmission electron microscopy (HRTEM) study of fresh and used Au/ZrO 2 catalyst is reported. FTIR data show that on a fresh sample CO is adsorbed on regular gold metallic sites, while on the used sample the adsorption sites are bidimensional gold clus…
The magnetic properties of several mixed-valent diruthenium long-chain carboxylates of general formula Ru(2)(RCO(2))(4)X (X = Cl, DOS, or RCO(2), DOS = dodecyl sulfate, and RCO(2) = linear aliphatic carboxylate or dialkoxy- or trialkoxybenzoate) were studied in the temperature range 6-400 K. All of the compounds exhib…
The effect of talc on cell nucleation of polypropylene (PP) foam was investigated. Branched high-melt-strength PP was used to reduce bubble coalescence during extrusion foam processing. When isopentane was used as a blowing agent, bubble nucleation was dominated by the talc concentration, and the isopentane content di…
Highly conductive polycrystalline ZnO films have been grown by metal organic chemical vapour deposition (MOCVD) using dimethylzinc (DMZn), dimethylzinc-triethylamine (DMZn-TEN) and tertiary butanol (tBuOH) as precursors. When (DMZn-TEN) is used the efficiency of the zinc precursors is reduced by the formation of gas-p…
The polyamorphism of triphenyl phosphite has been investigated from a low-frequency Raman-scattering study. Interesting features about glaciation processes have been revealed from a study of the boson peak and an analysis of the Raman susceptibility in the glacial and crystalline states. The very close correspondence…