Materials Literature
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Even under conditions of protective oxidation, significant structural changes can develop in the metal substrate. One observation frequently reported is that of subsurface cavitation, but it is not likely that the same physical processes always apply. In some cases, vacancy injection by the removal of cations and subs…
Abstract The observation of a novel phenomenon is reported whereby the processing history of a nylon 6 leads to a memory effect which in turn affects its crystallization rate from the molten state. Differential scanning calorimetry (DSC) and optical microscopy are the primary techniques used to demonstrate that the me…
The microbial polymer poly-3-hydroxybutyrate (PHB) and related poly-hydroxyalkanoates, such as poly-3-hydroxyvalerate and poly-3-hydroxyoctanoate, are unique biodegradable thermoplastics of considerable commercial importance. The structure, properties and regulation of synthesis and degradation of PHB are reviewed and…
Two types of permanent magnetic materials were obtained by annealing melt spun flakes : (i) materials consisting mainly of Fe3B with Nd2Fe14B as a secondary phase, and (ii) materials based on Nd2Fe14C. The methods of preparation and the resulting magnetic properties are presented.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydrogen atom tunneling in the thermal tautomerism of porphine imbedded in a n-hexane matrixThomas J. Butenhoff and C. Bradley. MooreCite this: J. Am. Chem. Soc. 1988, 110, 25, 8336–8341Publication Date (Print):December 1, 1988Publication History Published online1 May 2002Pu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydrogenolysis of ethane, propane, n-butane, and neopentane on the (111) and (110)-(1.times.2) surfaces of iridiumJ. R. Engstrom, D. W. Goodman, and W. H. WeinbergCite this: J. Am. Chem. Soc. 1988, 110, 25, 8305–8319Publication Date (Print):December 1, 1988Publication Histor…
Relaxation processes of excited copper porphyrins were studied with relevance to the structure of the substates of the lowest excited states. Lifetimes of luminescence at room temperature were determined as 17, 29, 69, and 105 ns for T(EtO)PPCu [T(EtO) PP: 5, 10, 15, 20-tetra (p-ethoxyphenyl)porphin], TPPCu(TPP: 5, 10…
Blue Phases remained up to very recent years quite mysterious. First observations were done at the end of the last century by Reinitzer in 1888 and by Lehmann in 1906. The precise nature of these phases was a puzzling problem. At present it is firmly established that they are real phases and not textures of other phas…
We obtain, using large deviations principles, full asymptotic expansions of functionals of Laplace type on Wiener space for general (i.e. degenerate) diffusions extending the results of Schilder [12], Azencott [2] and Doss [7, 20]. The variational hypothesis (non degeneracy of the minima) used here is shown to be opti…
Abstract Three different methods to synthesize star‐shaped poly(ethylene oxide) are discussed in the present article. In all three cases, the branches are grown from a plurifunctional initiator. It is established that even though the early stages of the polymerization occur in heterogeneous phase, the consequences on…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChronoamperometry of polypyrrole: migration of counterions and effect of uncompensated solution resistanceChris D. Paulse and Peter G. PickupCite this: J. Phys. Chem. 1988, 92, 24, 7002–7006Publication Date (Print):December 1, 1988Publication History Published online1 May 20…
The effect of particle size distribution on the sintering of Al 2 O 3 was investigated. Samples could be sintered to high relative density (∼99%), small average grain size (1 μm), and no growth of exaggerated grains using powders with either broad or narrow particle size distribution. However, the broad particle size…
Collagen IV dimers of two collagen IV molecules connected by their C-terminal globular NC1 domains were isolated by limited digestion with bacterial collagenase from mouse Engelbreth-Holm-Swarm (EHS) sarcoma tissue. The collagenous domains were only 300 nm long as compared to 400 nm of intact collagen IV but the disul…
The frequency and temperature dependence of the complex dielectric constant was measured near the smectic-${C}^{\mathrm{*}}$--smectic-A liquid-crystal phase (Sm-${C}^{\mathrm{*}}$--Sm-A) transition for two ferroelectric liquid crystals with a very large spontaneous polarization. The dielectric strengths as well as the…
Several new potential alternative transformation tougheners to zirconia have been identified on the basis of crystallographic considerations and experimental observations. Examples can be found in ceramics, minerals, and components of glass and of cement. The displacive transformations exhibit martensitic characterist…
The last decade has seen a tremendous growth in the research and development activities in the area of ferroelectric liquid crystals. The field was opened up by the work of Meyer in 1974, and has now grown rapidly into one of the major research areas in liquid crystal science. The emphasis of the earlier work was on b…
An overview of an important aspect of SANS research on charged colloidal suspensions is presented. These systems are characterized by pronounced interparticle correlations resulting from a strong and long-range double-layer interaction between macroions (i.e. the charged colloidal particles). Emphasis is laid on the u…
Following a major shortage of 99Mo in the 2009–2010 period, concern grew that the aging reactor production facilities needed to be replaced. Most producers were using highly enriched 235U (HEU) as the target material. The Organisation for Economic Co-...Read More
The Onsager-type theory for nematic ordering described in an earlier paper [J. Chem. Phys. 87, 4932 (1987)] is applied to a liquid-density fluid of hard ellipsoids of revolution, and an accurate calculation that agrees very well with the main features of computer simulations of this system is presented. For larger geo…
Absolute calibration forms a valuable diagnostic tool in small-angle scattering experiments and allows the parameters of a given model to be restricted to the set which reproduces the observed intensity. General methods which are available for absolute scaling of small-angle X-ray scattering (SAXS) data are reviewed a…