Materials Literature
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Abstract Nucleating agents increase the impact strength, tensile strength, and tensile elasticity modulus of semicrystalline polymers. Nucleating agents also decrease product cycle times, resulting in a cost savings per product unit. We have synthesized and tested 15 compounds as nucleactors for polypropylene. Of thes…
The interface response functions for alloy solidification were measured in the nondegenerate regime of partial solute trapping. We used a new technique to measure temperatures and velocities simultaneously during rapid solidification of Si-As alloys induced by pulsed laser melting. In addition, partition coefficients…
The on-site Coulomb interaction correction (LDA+U) and the generalized gradient approximation (GGA) seek to improve upon the accuracy of the local-spin-density approximation (LSDA) in the calculation of the electronic structure of the novel nitride Fe 16 N 2 . The non-locality of the exchange-correlation interaction i…
A Pt14 dendrimer is the highest nuclearity complex obtained by the first convergent method for the synthesis of alkyl transition metal dendrimers. The product of the first growth cycle is 1, which forms by oxidative addition of 4,4′-bis(bromomethyl)-2,2′-bi-pyridine to [Me2Pt(tBu2bpy)] and subsequent introduction of a…
Abstract Corn starch was blended with styrene maleic anhydride copolymer (SMA), ethylene‐propylene‐ g ‐maleic anhydride copolymer (EPMA), and corresponding nonfunctional polystyrene and ethylene propylene copolymers. The concentration of starch in the blend was varied between 50 and 80% by weight. The torque generated…
Porous silicon superlattices have been fabricated electrochemically. The current was monitored periodically during the electrolysis and samples were made with several periods. They have been investigated using reflectance measurements in the infrared and visible range. We demonstrate that porous silicon superlattices…
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.