Materials Literature
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Symmetric diblock copolymers confined between two solid surfaces were studied by neutron reflectivity. A multilayered morphology with an integral number of layers oriented parallel to the solid interfaces was found in all cases. The period of the confined multilayers deviated from the bulk period in a cyclic manner as…
The kinetics of structural, relaxation of poly(methyl methacrylate) (PMMA) is studied and it is shown that the activation energy of the process depends on the structural temperature T f . A new method is proposed allowing the measurement experimentally of how the activation energy decreases with increasing T f . The d…
Dissolution of UO2 crucibles by molten Zircaloy-4 (Zry) was investigated in the temperature range of 2,223-2,373 K and for specimens having UO2/Zry mole ratios between 7 and 18.2. The uranium concentration in the Zry melt rapidly increased during initial reaction time and approached saturated values, depending on reac…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, Structure, and Physical Properties of a Novel Quaternary Niobium Telluride, Nb2FeCu0.35Te4Jing Li, Frank McCulley, Mark J. Dioszeghy, S. C. Chen, K. V. Ramanujachary, and M. GreenblattCite this: Inorg. Chem. 1994, 33, 10, 2109–2114Publication Date (Print):May 1, 1…
Abstract Farblose Einkristalle von K 6 [Al 2 O 6 ] wurden aus innigen Gemengen von KAlO 2 und K 2 O erhalten (550°C, 90 d). Die Strukturaufklärung (Vierkreisdiffraktometer, MoK α , 742 I o (hkl), R = 2,2%, R w = 2,1%) bestätigt die Raumgruppe C2/m mit Z = 2; a = 698,25 pm, b = 1 103,54 pm, c = 646,49 pm, β = 102,49°.…
The marked changes in the dielectric and thermal properties of vulcanized cis-1,4-polyisoprene due to different iodine doping levels are investigated. The results show strong evidences of formation of conjugated sequences of unsaturated double bonds in the vulcanized polyisoprene backbone, through visible and infrared…
This paper addresses the feasibility of friction welding a:s an approach to join aluminum to ceramics. Potential advantages include the localised heating below the melting point of the parent materials, and the short time required to produce the bond. Metal / ceramic combinations examined include aluminum / silicon ni…
Abstract X‐ray absorption measurements in the low (pseudo‐rutile) and high (rutile) temperature phases of VO 2 are described. Investigations are made versus temperature and polarization. The analysis of the results leads to conclusions concerning the scattering mechanisms at the origin of the pre‐edge, the edge, and t…
The response of a target to a KEW impact can be said to consist of 'local' and 'global' phenomena. For KEW impacts, damage associated with local response occurs very quickly and is limited to a volume immediately adjacent to the impact site. Global response can refer to any one of a number of phenomena that occur over…
Both the fiber push-in and the slice compression tests have been used to evaluate the interfacial properties of fiber-reinforced ceramic composites. Mechanics of sliding at the fiber-matrix interface obtained with these two tests are compared in the present study. While the interfacial radial stress induced by Poisson…
Abstract The synthesis spectroscopic properties and tautomerism of four novel mono ‐meso substituted(R)‐octamethylporphyrins (R= o ‐hydroxybenzyl, p ‐aminobenzyl, 4‐pyridinyl, and ferrocenyl) were investigated. It was found that the porphyrins 2 , 3 could be directly prepared in good yields via the coupling reaction o…
A fluoroaluminozirconate glass was compared with a fluorozirconate and a fluoroaluminate glass as a host material for upconversion emissions in a Ho3+–Yb3+-codoped system. The green emission of 543 nm is 50% stronger in fluoroaluminozirconate than in fluorozirconate. This is because the emission is primarily governed…
A scanning electron microscope (SEM) can be used to measure the dimensions of the microlithographic features of integrated circuits. However, without a good model of the electron-beam/specimen interaction, accurate edge location cannot be obtained. A Monte Carlo code has been developed to model the interaction of an e…
A new class of photochromic compounds called isofulgimides is described and their photochromic and chemical transformations discussed. Their potential in commercialization of these photochromes is also indicated.
The lines of double saturation separating the areas of primary crystallisation of Nd 2 Fe 17 , Nd 2 Fe 14 B, and Nd 1.1 -Fe 4 B 4 have been rerouted as a result of DTA measurements and microstructural observations. The data are incorporated in an updated version of the liquidus projection for the Nd-Fe-B system taking…
The merocyanine form of BIPS and three of its nitro derivatives were studied by surface—enhanced Raman spectroscopy. It was found that in case of the nitro derivates, the SERS spectra originated from the unprotonated open merocyanine forms, even if the solution was acidified. In case of 6-nitro BIPS, there exist two e…
Spiropyran modified concanavalin A, Con. A, reveals photoregulated binding towards monosaccharides. The association constants of the substrate towards the spiro-Con. A and the kinetics of the association processes are photostimulated. These photostimulated properties are originated from a structural perturbation of th…
Planar growth of a solid germ of infinitesimal initial thickness from an undercooled melt is addressed within a continuum model with linear interfacial kinetics. For this problem, we present an analytic solution that describes the global features of the process beyond the initial and long-time limits. In particular, i…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTProduction and Toxicity Assessment of Sophorosides from Torulopsis bombicolaSerge Krivobok, Pascale Guiraud, Francoise Seigle-Murandi, and Regine SteimanCite this: J. Agric. Food Chem. 1994, 42, 5, 1247–1250Publication Date (Print):May 1, 1994Publication History Published on…
(CH3NH3)3Sb2Br9 crystals were studied by pyroelectric method in the temperature range 10 – 200 K. Pyroelectric measurements revealed reversal spontaneous polarization below 141 K along the a-axis. The optical observations showed that MABA possesses ferroelastic domains in all low temperature phases.