Materials Literature
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Rust formed by corrosion on the inner surfaces of oil tanks may react with hydrogen sulfide gas in the vapor above crude oil. This reaction produces mixtures of iron sulfides which are pyrophoric, and they cause explosions when they are exposed to air during the unloading of the tankers. This paper shows that it is po…
Abstract Graft copolymerization of styrene (St) onto poly(3‐hydroxybutyrate) (PHB) and poly(3‐hydroxybutyrate‐co‐3‐hydroxyvalerate) (P(HB‐HV)) was carried out using simultaneous irradiation and pre‐irradiation techniques with 60 Co γ‐rays. The degree of grafting (X g ) of styrene onto PHB increased with increasing pre…
The spreading parameter S is the fundamental parameter controlling the stability of thin liquid films intercalated between a hydrophobic solid and a soft elastomer (Young modulus E ): S = γ SR − (γ SL + γ LR ), where γ SR, γ SL, and γ LR are respectively the solid/elastomer, solid/liquid, and liquid/elastomer interfac…
The expression for the interaction force exerted by a sound field between two gas bubbles, allowing for the compressibility of the surrounding liquid, is derived. The bubble radii are considered to be small compared to the distance l between the equilibrium centers of the bubbles and the wavelength λ of sound, while t…
The narGHJI operon encodes the three subunits, alpha, beta, and gamma, of the respiratory nitrate reductase complex in Escherichia coli. A fourth open reading frame of the operon encodes a putative protein, NarJ, which is not present in purified nitrate reductase, but is required for biogenesis of the membrane-bound c…
The first stable molecular Fev complex, [Fev(I)(′N2S2′)], forms in the metal-centered oxidation of the readily accessible FeIV complex [FeIV(pnPr3)(′N2S2′)] with elemental iodine according to Equation (a). The high-valent character of the iron center is proved by structural, spectroscopic, and electrochemical data.
Abstract The synthesis of appropriate porphyrin‐quinone electron‐transfer complexes as model compounds for photosynthesis requires access to functionalized triptycene quinone aldehydes with different redox potentials. A synthetic strategy involving a classical Diels‐Alder reaction, tautomerization and oxidation was on…
The ability to resist adhesion of proteins, bacteria, cells and tissue is an important requirement for the surfaces of medical devices. This article describes a surface-modification process that imparts anti-adhesive properties to the surfaces of biomedical materials through the covalent binding of hyaluronan. It can…
The change in local atomic configurations during electron irradiation was studied by the analysis of the extended energy-loss fine structure of a highly oriented pyrolytic graphite crystal. The spectral change obtained was interpreted in terms of the local distortion of the basal planes and the formation of alternativ…
The localized concentration of energy during a single bubble collapse is manifested in two forms, which are the emission of an acoustic pulse, and the emission of a light pulse. Through precise control of experimental parameters, one can levitate a single bubble in a standing wave field and measure the magnitude of th…
A wealth of literature in research at molecular levels concern ing the transition metals, e.g., Cu- and Mo-containing compounds, has been intensively documented for flame retardance, particularly smoke suppres sion, of PVC. An attempt has been made in this article aimed at performing a cone calorimetric analysis in ai…
Selected divalent cations were surveyed to examine their suitability as a co-dopant in Cr : Y3Al5O12 for the promotion of Cr4+. The only successful co-dopants were Ca and Mg. The following co-dopants failed to generate Cr4+ in significant concentrations: Co, Cu, Fe, Mn, Zn, Sr. The lack of success in the transition me…
N, N‘ -Bis[(3-carboxynorbornadien-2-yl)carbonyl]methylenedianiline (BNMA) was synthesized in 87 % yield by the reaction of 2,5-norbornadiene-2,3-dicarboxylic acid anhydride with 4,4‘-methylenedianiline. Other dicarboxylic acid derivatives containing norbornadiene (NBD) residues were also prepared by the reaction of 2,…
Abstract Chitosan/calcium‐alginate beads were prepared by a coacervation method in aqueous medium. Their swelling properties and morphologies were studied. Complexed beads with a mean diameter of 500 μm were obtained by dropwise addition of a sodium alginate solution into a chitosan‐calcium chloride solution. From sca…
The use of surface-enhanced Raman scattering (SERS) as an analytical technique continues to grow, but questions about its viability remain. This paper addresses the concern about the long-term stability of the surfaces used with the SERS technique. We have studied the long-term stability of Ag surfaces coated with thr…
Wood-fiber thermoplastic composites were prepared with polypropylene (PP) and high-density polyethylene (HDPE) matrix resins employing high shear thermokinetic compounding for fiber dispersion. Wood fibers obtained from recycled newspapers were mixed with the matrix polymers at a level of 30% by weight. In one experim…
Structure and Bonding at NiFATAL ERROR -- Missing abstract.ndash;ZrO 2 (Cubic) Interfaces Formed by the Reduction of a NiOFATAL ERROR -- Missing abstract.ndash;ZrO 2 (Cubic) Composite
Abstract— The fracture behaviour of borosilicate glass reinforced by molybdenum and/or vanadium particles has been investigated. For the addition of 5 vol% molybdenum particles, two processing procedures have been tested and the influence of volume fraction of vanadium particles (in the range 2 to 30 vol%) on fracture…
Abstract The purpose of this study was to accumulate material data for use in a simulation of morphology and crystallization in quenched slabs of isotactic polypropylenes (i‐PP's). The molecular weight effect on the crystallization kinetics of various i‐PP's were studied using isothermal and nonisothermal experiments.…
ABSTRACT Zein fibers were successfully prepared by a wet‐spinning technique from a zein suspension formulated with 15% zein, 60% water, 22% 0.4 N sodium hydroxide, and 3% urea by weight. Tenacities were measured with an Instron machine, and flexibility was determined by noting the smallest diameter rod around which a…