Materials Literature
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Results from structure refinement using neutron powder diffraction data for boron carbide samples with 10, 13, 16, and 20 at. % carbon are reviewed. Those obtained for ceramic powder samples show an apparent large vacancy concentration (as high as 25%) at the central atom position of the linear three-membered chains.…
We investigate the dispersion of polymer-grafted particles suspended in a polymer matrix by viscoelastic measurements and electron microscopy. We find that, when the graft density is low, the particle dispersion improves with an increase of the graft density, while the particle dispersion becomes worse when the graft…
Thin films of ZnO:Al have been deposited on glass substrates by a pulsed laser deposition technique employing an ArF laser ( λ=193 nm). For all experiments, a repetition rate of 10 Hz, an energy density of 1 J/cm 2 , and an irradiation time of 20–30 min (12000–18000 shots) were assumed. Optical transmittance of around…
X-ray photoelectron spectroscopy (XPS) has been used to investigate the surface characteristics of various novel fluorinated acrylate homopolymers [1,1-dihydroperfluorooctyl acrylate (PFOA), 1,1-dihydroperfluorooctyl methacrylate (PFOMA), 1,1,2,2-tetrahydroperfluorooctyl acrylate (PTAN)] as well as diblock copolymers…
Measurements of the complex impedance of the interface between mild steel and deaerated 1 M HCl solutions without and with the addition of different inhibitors, derivatives of benzimidazole, have been made in the frequency range of (0.1−9.5) × 10 4 Hz. Adequate structure models of the interfaces as well as some data o…
Kinetic studies of the hydrolysis and condensation of tetraethylorthosilicate (TEOS) during the formation of uniform silica particles were performed through determining concentrations of TEOS and silicic acid by means of gas chromatography and a conductometer, respectively. It was shown that both hydrolysis of TEOS an…
On the basis of DRS, ESR, and XPS studies, the nature and the dispersion of nickel species deposited on ceria (by hydrolysis of an aqueous solution of nickel nitrate) have been investigated upon thermal activations in air. Before thermal activation, mainly octahedral Ni II species belonging to a Ni(OH) 2 deposit are o…
Porcine pancreatic elastase has been used as the model enzyme in the design and development of a crystallographic method that allows mapping of the binding surface of a protein by solving its crystal structure in a variety of organic solvents. The ultimate goal of this method is to aid in the process of drug design, w…
We have obtained detailed capillary kinetic data for flow of a series of alcohols with various surface tension to viscosity ratios, γ/μ, spreading in open V-shaped grooves cut in Cu with three different groove angles. The location of the three-phase contact line, z, with time always follows the formula z 2 = K (α,θ)[γ…
Au/α-Fe 2 O 3 and Au/Co 3 O 4 catalysts prepared by coprecipitation with a nominal 10 atom % Au are active for CO oxidation even at temperatures below 0 °C. The surfaces of these as-prepared, powdered catalysts have been examined using X-ray photoelectron spectroscopy (XPS) and ion-scattering spectroscopy (ISS) to gai…
The temperature dependence of the Eu 3+ 5 D 0 relaxation rate in solid europium tris(2,2,6,6-tetramethyl-3,5-heptanedionato) is presented. Eu 3+ emission is strongly quenched in the region of room temperature. It is proposed that thermal quenching of 5 D 0 emission is via crossover from the 5 D 0 to a ligand-to-lantha…
Nanotubules and nanofibrils of polypyrrole were chemically synthesized using the pores of nanoporous polycarbonate membrane filters as templates. We have previously shown that such “template-synthesized” nanofibrils of polypyrrole can have enhanced conductivities relative to more conventional forms of the polymer (e.g…
The size of cobalt ferrite particles from 2 to 5 nm is controlled by the reactant concentration in oil-in-water micelles. It is possible to obtain the particles either suspended in the solvent to form ferrofluid or in dry powder. When particles are isolated in a fluid, the interactions between particles are small. The…
Heated carbon materials were made from organic precursors between 550 and 1000 °C. High capacities for lithium were found in all of the samples heated below 800 °C, which all contain substantial hydrogen. The majority of this high capacity shows large hysteresis; that is the lithium is inserted near 0 V (versus lithiu…
We have developed a novel nanocomposite material, [PANI] 0.24 MoO 3, comprised of poly(aniline) chains interleaved with the layers of MoO 3, using concomitant ion exchange−polymerization in the presence of an external oxidizing agent. The characterization of this material using SEM, FTIR spectroscopy, powder XRD, and…
The relevance of commutator methods in spectral and scattering theory has been known for a long time, and numerous interesting results have been ob tained by such methods. The reader may find a descri
Abstract
Ultrasound has applications in materials, organometallic, polymer and synthetic chemistry as well as materials and waste degradation. After a brief description of the fundamentals of sonochemistry, an overview about current uses and future prospects in these fields is given.
Independent, practical guidance on the structural design of polymer composites is provided for the first time in this book. Structural designers familiar with design of conventional structural materials such as steel and concrete will be able to use it to design a broad range of polymeric composites for structural app…
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