Materials Literature
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Electromigration failure is modeled as a nucleation and growth process, where void nucleation is due to the generation of a nonequilibrium vacancy concentration from an electromigration induced mass flux divergence. Following nucleation, voids grow until equaling the width of the conductor, causing an open circuit. It…
Unique paramagnetic liposomal contrast agents were synthesized and utilized for selective augmentation of T1 MR imaging of the livers of normal Balb/c mice. A series of amphipathic gadolinium complexes, which mimic phospholipids, was incorporated into the lamella of small unilamellar liposomes such that they become an…
In the present paper the quartz crystal microbalance is used as a sensitive detector of mass changes taking place during an electrochromic process. Electrochemical and electrochromic characteristics of nickel oxide electrodes strongly depend on the preparation method of the samples. Three different types of materials…
Release of D&C Yellow No. 10 and anhydrous theophylline have been determined from a thermosoftening, hydrophilic matrix, Gelucire 50/13, incorporating a water-soluble additive, polyethylene glycol 4000. As additive level increased, release also increased. The effect of mixtures of Gelucire 50/13 (G50/13) and Gelucire…
Assessing the condition of a GIS by measuring the UHF signals generated in it by partial discharges gives warning of developing faults. The signals are taken from couplers built into the equipment. The couplers are continuously monitored using special amplifying and detection units connected in a digital optical fiber…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXT"Living" titanium(IV) catalyzed coordination polymerizations of isocyanatesTimothy E. Patten and Bruce M. NovakCite this: J. Am. Chem. Soc. 1991, 113, 13, 5065–5066Publication Date (Print):June 1, 1991Publication History Published online1 May 2002Published inissue 1 June 199…
We have examined a series of metaphosphate glasses with 31 P magic angle spinning nuclear magnetic resonance (MAS NMR) spectroscopy. Increasing the ionic potential ( Z/a ) of the modifying cation from sodium to magnesium causes a systematic change to more shielded isotropic chemical shifts with a concomitant increase…
Abstract A liquid‐crystalline side‐chain polymer with laterally incorporated naphthalene groups in the mesogenic moiety is investigated in binary mixtures with an optical uniaxial low‐molar‐mass liquid crystal. Mixtures with up to 50 mol‐% content of the monomeric liquid crystal show a biaxial nematic phase. At lower…
Uniaxial tension–compression fatigue behavior of 3‐mol%‐yttria‐stabilized tetragonal zirconia polycrystals was investigated. Hysteresis in the stress–plastic strain curve featured cumulative plastic strain and weakened elastic stiffness. Fracture statistics in terms of cycle‐to‐failure depends strongly on the maximum…
11 B and 27 Al magic angle spinning nuclear magnetic resonance (MAS NMR) spectra of alkaline‐earth boroaluminate glasses show that the structure of these glasses are far more complicated than previously thought. The relative concentrations of 3‐ and 4‐coordinated boron vary as found by previous investigators using con…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSurface induced crystallization in ultrahigh-modulus polyethylene fiber-reinforced polyethylene compositesHatsuo Ishida and Philippe BussiCite this: Macromolecules 1991, 24, 12, 3569–3577Publication Date (Print):June 1, 1991Publication History Published online1 May 2002Publi…
Amorphous carbon (a-C) thin films have been prepared by r.f. magnetron sputtering of graphite targets in an Ar atmosphere and their d.c. electrical dark conductivity has been measured as a function of temperature. The results are compared with those obtained by earlier workers for a-C and hydrogenated a-C. A detailed…
The reaction of a stoichiometric mixture of aluminum isopropoxide and yttrium acetate in 1,4‐butanediol at 300°C yielded crystalline yttrium aluminum garnet having an approximate particle size of 30 nm. No other phases were detected. The use of ethylene glycol in place of 1,4‐butanediol afforded an amorphous product.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSuperconductivity at 2.8 K and 1.5 kbar in .kappa.-(BEDT-TTF)2Cu2(CN)3: the first organic superconductor containing a polymeric copper cyanide anionUrs Geiser, Hau H. Wang, K. Douglas Carlson, Jack M. Williams, Henry A. Charlier Jr., James E. Heindl, George A. Yaconi, Bradle…
Fairly monodisperse colloidal boehmite fibrils with a high aspect ratio were synthesized by hydrothermal treatment at 150°C of an acidified aqueous alkoxide solution, prepared by adding an aqueous HCl solution to an aluminum alkoxide precursor. The average particle length could be controlled between about 100 and 500…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal decomposition of some phenolic antioxidantsAnwar A. Hamama and Wassef W. NawarCite this: J. Agric. Food Chem. 1991, 39, 6, 1063–1069Publication Date (Print):June 1, 1991Publication History Published online1 May 2002Published inissue 1 June 1991https://pubs.acs.org/do…
Ten dental casting alloys were tested for alloy-element release into cell-culture medium, and this release was related to alloy composition, alloy microstructure, and alloy cytotoxicity (previously determined). Cell-culture medium was analyzed for alloy elements by flame atomic absorption. Concentrations of elements i…
Grain growth in a high‐purity ZnO with systematic additions of Sb 2 O 3 from 0.29 to 2.38 wt% was studied for sintering in air from 1106° to 1400°C. The results are discussed and compared with previous studies of pure ZnO and ZnO with Bi 2 O 3 additions in terms of the kinetic grain growth expression: G n – G n 0 = K…
The sintering of zinc oxide powder compacts has been investigated at constant rates of heating of 0.5° to 15°C/min. For samples with the same initial relative density (0.50), the temperature derivative of the densification strain versus density fits within a single, relatively narrow band. At low temperatures the dens…
Studies with 20 soils containing from 7 to 204 g kg‐1 total carbon and from 0.5 to 16.9 g kg‐1 total nitrogen indicated that the Leco CR‐12 Carbon Determinator and the Leco CHN‐600 Elemental Analyzer are satisfactory for routine analysis of soils for total carbon and that the Leco CHN‐600 Elemental Analyzer is also sa…