Materials Literature
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Derivatives of DMABN are described, where the cyano group is replaced by an amide function with different acceptor strengths. This leads to a consistent variation of the dual fluorescence observed, describable within the established TICT model. Time resolved experiments give evidence of an additional complication with…
The ionic and electronic transport properties of (with Me = Fe or Cr and x = 0, 0.05, or 0.20) were studied by impedance spectroscopy in air (250 to 1000°C), high temperature (700 to 1000°C) ac conductivity measurements as a function of oxygen partial pressure ( ranging from air to about 10 −15 Pa), and ion blocking m…
We investigated the composition, properties, and utility of a novel copolymer of P(AAm- co -EG) designed to be an adaptable, durable, and biocompatible surface treatment of metallic, polymeric, and ceramic materials. Solution deposition and photoinitiation reactions were employed to graft a silane layer and then two s…
A systematic study of the binding of carbohydrates by functionalized zinc porphyrins indicated that [5, 15-bis(8-quinolyl)porphyrinato]zinc(II) ( 1 ) showed marked affinity for octyl glucoside and mannoside in CHCl 3 (−Δ G ° = 4.5−6.3 kcal mol - 1 ). Analysis of the complexation-induced shifts of the carbohydrate OH p…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTSynthesis and Cation-Mediated Electronic Interactions of Two Novel Classes of Porphyrin−Fullerene HybridsPhil S. Baran, Regina R. Monaco, Ahsan U. Khan, David I. Schuster, and Stephen R. WilsonView Author Information Department of Chemistry, New York University New Yor…
A high coordination lattice was recently introduced for the simulation of coarse-grained rotational isomeric state (RIS) model chains. This second nearest neighbor diamond (2nnd) lattice is formed by connecting every other site on a tetrahedral lattice. Monte Carlo simulations of polyethylene (PE) melts have recently…
The upper critical field, ${H}_{c2}$, of LuN${\mathrm{i}}_{2}$${\mathrm{B}}_{2}$C has been determined from the temperature dependence of the magnetization. A temperature dependent anisotropy within the basal plane which decreases from a value of 1.1 at 4.5 K to a value of 1.0 at ${T}_{c}$ and an almost temperature ind…
The two germanates K 2 MgGeO 4 and K 2 CdGeO 4 have been synthesized by solid-state reaction. These compounds are isostructural with K 2 ZnGeO 4 , space group Pca 2 1 (No. 29), Z =8. Unit cell parameters were determined: for K 2 MgGeO 4 a =11.1810(11), b =5.5708(6), c =15.8694(16) Å, V =988.5(3) Å 3 and for K 2 CdGeO…
The flexible slabstock polyurethane foam industry has been undergoing regulatory changes in recent years. The mandated reduction in halogenated blowing agents (CFCs) has profound implications for the development of adequate heat stabilization systems for the slabstock foam. Increased bun temperatures and concomitant s…
Abstract This paper focuses on microbial aspects of degradation of synthetic polymers, especially of water‐soluble specialty polymers. The polymer structures analogous to natural polymers suggest biodegradability which originates from enzymes which do not discriminate between natural and synthetic polymers. Hydrolysis…
The feasibility of producing HIPS of UL-94 5V flammability rating has been demonstrated. Results of TGA, XRD and SEM enable the role of such components as brominated organic flame retardant, antimony trioxide, chlorin ated polyethylene and magnesium hydroxide in flame retardancy of 5VA HIPS to be evaluated.
The non-isothermal crystallization kinetics of PEEK in the presence of carbon fibers are investigated for PEEK/carbon composites made from both prepreg and commingled systems. The crystallization kinetics under non-isothermal conditions are studied over a wide range of cooling rates, varying from 0.5°C/min to 160'C/mi…
The effects of daily oral feeding of a crude alcohol extract from the pericarp of unripe fruits of Balanites roxburghii at a dose of 500 mg/kg for 45 days were investigated with respect to epididymal and testicular histophysiology, metabolism and the fertility potential of mice, following withdrawal study. The testicu…
Shrimp and crab shells as well as other seafood industry residues contain chitin as a major component. Partly degraded (oligomeric) chitin is recognized as an elicitor of plant defense mechanisms and a growth suppressor of pathogenic fungi. A method of composting shrimp shells was developed with the objective of obtai…
Resíduos de borracha, provenientes de indústrias de calçados e de pneus, foram adicionados ao poliestireno visando tenacificá-lo. As misturas foram realizadas em extrusora dupla-rosca e a moldagem feita por compressão e por injeção. Os efeitos da concentração ( 5-25% em peso) e granulometria (1200 a 180mm) dos resíduo…
Abstract In cubic Y 2 O 3 (10–25 mol%) or CaO (14 and 17 mol%) stabilized ZrO 2 , oxygen vacancies are created as charge‐compensating defects. Mechanical loss (internal friction) measurements are performed on single crystals of cubic zirconia with various orientation at frequencies of f ≈︁ 1 Hz and 1 kHz, to study the…
The zero-field-cooled magnetization at the magnetic field H = 300 Oe shows anomolous kinks at TA and TB (>TA far below the reentrant spin-glass-like transition temperature Tf (above which a long-range ferrimagnetic ordering is set up). The irreversibility between the zero-field-cooled and the field-cooled magnetizatio…
A novel class of allyl compounds based on epoxy resins was synthesized and characterized. The synthesis of these allyl compounds was carried out by reacting corresponding epoxy resin with 2-allyl-4-methylphenol. The copolymers of 4,4′-bismaleimi-dodiphenyl methane with the allyl compounds were prepared and their prope…
The wetting behavior of single‐crystalline magnesia (MgO) by fayalite‐type slag melts has been studied by the sessile‐drop technique, which incorporates high‐temperature X‐ray radiography. The experiments have been performed under oxygen partial pressures of 106 and 104 Pa at a temperature of 1473 K. The mass ratios o…
Copper has been proposed as a possible replacement for aluminum as the primary microelectronics metallization material. As the feature sizes of ultralarge scale integration (ULSI) technologies reach sub-0.25 μm in dimension, new metallization processes must be developed to properly fill the extreme topographies. This…