Materials Literature
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Thermal effects in a high-performance fusion-bonded epoxy (FBE) powder coating on steel were measured by electrochemical means. Experimental performance of the coating in immersion indicated the coating resistance as acquired by electrochemical noise methods (ENM), electrochemical impedance spectroscopy (EIS), and dir…
Abstract Microbial reduction of clay mineral structural Fe(III) decreases the swelling of nontronite gels, most importantly at intermediate oxidation states (40 to 80 cmol Fe(II) kg −1 clay). The purpose of this study was to establish whether microbial reduction of structural Fe(III) decreased the swelling of other Fe…
The influence of electron dosage on the field induced strain, dielectric constant, and polarization response has been investigated in electron irradiated poly(vinylidene fluoride-trifluoroethylene) (P(VDF-TrFE)) 50/50 copolymer. It was found that under suitable electron dosage an ultrahigh electrostrictive strain can…
Four organometallic complexes of Eu 3+ with 2,2‘-bipyridine (bipy), benzoyltrifluoroacetone (btfa), 1,10-phenanthroline (phen), and dipicolinic acid (dpic) have been prepared in Y, mordenite, and ZSM-5 zeolites by adsorbing the ligand into Eu 3+ -doped zeolites. Different samples were obtained varying the Eu 3+ conten…
Cracking, or disbonding, along the fusion boundary in dissimilar metal welds has been a persistent problem, particularly in applications where austenitic alloys are clad on to structural steels for corrosion protection. Many failures in dissimilar metal welds occur as a result of cracking along a boundary that runs pa…
The decomposition of Al 2(1‐ x ) Mg x Ti (1+ x ) O 5 ceramics in air has been studied between 900° and 1175°C for 0 lessthan equal to x lessthan equal to 0.6. The decomposition temperature versus composition x predicted using a thermodynamic model based on the regular solution approach is in satisfactory agreement wit…
alpha‐Alumina and boehmite particles were synthesized by coprecipitation followed by a hydrothermal treatment. X‐ray diffraction (XRD) indicated that alpha‐Al 2 O 3 was the major phase and coexisted with 4% of boehmite in the presence of the alpha‐Al 2 O 3 seeds. On the other hand, a single boehmite phase was obtained…
Nonlinear self-focusing of the laser beam in waveguide with nematic homeotropically aligned liquid crystalline layer is analysed theoretically and observed experimentally. The nonlinearity is caused by the reorientational effect and the stable self-trapped beams are created by the spatially periodic reorientation in t…
ZrO 2 ‐2 mol% Y 2 O 3 crystals with average grain sizes from 0.51 to 0.96 µm were prepared by sintering in air at 1400°C for 2 to 100 h. The tetragonal‐to‐monoclinic phase transformation associated with the low‐temperature degradation was investigated to clarify how the presence of water directly affects the influence…
Macromolecular crystallographic refinement has recently been made more efficient by the use of cross-validated maximum likelihood targets and torsion-angle molecular dynamics simulated annealing. In combination with automated model building methods, the amount of manual intervention required to complete and refine a s…
Tailored surface and bulk properties of polyimide films have resulted from new technology demands, e.g., the request for stronger, more dimensionally stable films with lower moisture content. The technology trends parallel the demands of the marketplace as well as the demands of manufacturing. The authors present the…
A noncontact technique of measuring the changes in electrical conductivity (or resistivity) of conducting liquids is reported. The technique is based on a conducting drop that is levitated by the high-temperature electrostatic levitator in a high vacuum. This technique, which utilizes the principle of the asynchronous…
Adverse tissue reactions of the gingiva and the periodontium close to dental cast alloys may be caused by the effects of released metal elements. Tissue reactions depend upon the amounts of elements available which are a function of corrosion rates. Since pH values of standard corrosion solutions are as low as 2.3, su…
The intercalation of copper underneath a graphite monolayer (MG) formed on Ni(111) has been investigated by means of HREELS, Auger spectroscopy and LEED. The softening of the graphite phonon modes in the case of the MG/Ni(111) system, caused by a strong interaction with the Ni substrate, is removed after intercalation…
CdS and CdS:Mn nanoparticles were studied by 113 Cd and proton NMR. Nanoparticle samples were synthesized by precipitation of CdS from an aqueous solution of Na 2 S and CdSO 4 . The nanoparticles were not deliberately capped by any surface-termination agent. The NMR spectra of CdS nanoparticles prepared with an excess…
Abstract Blends of low density polyethylene (LDPE) and linear low density polyethylene (LLDPE) are widely used for blown film applications. An accurate and rapid test scheme to identify the type and composition of α‐olefin in LDPE/LLDPE blends has been developed that utilizes differential scanning calorimetery (DSC) a…
Problems associated with intermittent and variable degrees of sample blackening are often reported for studies involving the preparation of CO 2 -bearing silicate glasses in piston- cylinder apparatus. This phenomenon is generally attributed to H infiltration, which leads to the reduction of CO 2 and the precipitation…
25 Mg NMR spectra for several silicate and aluminosilicate melts were obtained from 1000-1470 °C. The peaks are initially very broad, but narrow with increasing temperature to near 500 Hz at the highest temperatures. The peak positions for most of the melts do not shift noticeably with temperature in the range studied…
We have synthesized phospholipid polymers containing 2-methacryloyloxyethyl phosphorylcholine (MPC) units as novel blood compatible polymers and have evaluated their interactions with blood components. It was found that in the absence of anticoagulants, blood clotting was delayed and blood cell adhesion and activation…
Solid acids offer a simple and more benign alternative to traditional acid-catalyzed chemical processes. Ways in which this opportunity is being addressed through the synthesis and characterization of new solid acids incorporating perfluorosulfonic acid groups as proton donors are described. The Figure represents a pe…