Macrocyclic polyaminocarboxylate complexes of lanthanides as magnetic resonance imaging contrast agents
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Influence of halogenation and aggregation on photosensitizing properties of zinc phthalocyanine (ZnPC)
The effects of halogenation and aggregation on photosensitizing properties of zinc phthalocyanine (ZnPC) have been examined by photophysical methods. Halogenation decreases the fluorescence yield and lifetime, increases triplet formation and shortens the triplet lifetime. These effects, which increase in the order Cl…
Weibull statistics in short-term dielectric breakdown of thin polyethylene films
A Weibull statistical analysis of breakdown voltages of thin polyethylene-insulated power cable slices is performed on large populations. Computation of confidence intervals implies that the statistically correct description is a three-parameter Weibull distribution, i.e., with a nonzero location parameter. It is show…
Comparative compaction properties of various Microcrystalline Cellulose types and Generic Products
The purpose of this review is to compare the tableting properties of conventional microcrystalline cellulose (MCC) with those of other common direct compression diluents and of the numerous new MCC grades and brands recently made available. After a brief discussion of the mechanisms of consolidation involved in the fo…
exo-Selective acceleration of an intermolecular Diels–Alder reaction by a trimeric porphyrin host
A bimolecular Diels–Alder reaction is accelerated substantially and stereoselectively by binding diene and dienophile within the cavity of a cyclic metalloporphyrin trimer.
Refractive index dispersions of liquid crystals
Refractive indices of two nematic liquid crystals, 5CB and 5PCH, were measured from the 400- to 800-nm region at various temperatures. Results fit the three-band model well. Through comparisons, the contributions of σ and π electrons to the refractive indices and birefringence of uniaxial liquid crystals are evaluated…
Accelerated aging and flashover tests on 138 kV nonceramic line post insulators
The behavior of 138 kV nonceramic line post insulators is investigated by means of clean fog tests conducted before and after aging in a specially designed accelerated aging chamber. The laboratory aging cycles are justified on the basis of actual weather in the coastal regions of Florida. Analytical measurements quan…
Transformation, Microstructure Development, and Densification in α‐Fe 2 O 3 ‐Seeded Boehmite‐Derived Alumina
Addition of α‐Fe 2 O 3 seed particles to alkoxide‐derived boehmite sols resulted in a 10‐fold increase in isothermal rate constants for the transformation of γ‐ to α‐Al 2 O 3 . Changes in porosity and surface area with sintering temperature showed no effect of seeding on coarsening of the transition alumina gels, but…
Nanoscale metal oxide particles as chemical reagents. Intrinsic effects of particle size on hydroxyl content and on reactivity and acid/base properties of ultrafine magnesium oxide
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNanoscale metal oxide particles as chemical reagents. Intrinsic effects of particle size on hydroxyl content and on reactivity and acid/base properties of ultrafine magnesium oxideHidenobu Itoh, Suchada Utamapanya, Jane V. Stark, Kenneth J. Klabunde, and John R. SchlupCite t…
Deposition of cadmium sulfide films by decomposition of thiourea in basic solutions
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDeposition of cadmium sulfide films by decomposition of thiourea in basic solutionsPeter C. Rieke and Susan B. BentjenCite this: Chem. Mater. 1993, 5, 1, 43–53Publication Date (Print):January 1, 1993Publication History Published online1 May 2002Published inissue 1 January 19…
Growth and properties of triglycine sulfate (TGS) crystals: Review
The present status of data on growth and properties of pure and doped single crystals of triglycine sulfate (TGS) is reviewed. The results of growth and characteristics of TGS crystals grown in the low-gravity environment of the space shuttle for infrared detector applications are presented. Applications of crystals i…
Property Modification of Edible Wheat, Gluten-based Films
Procedures were developed to produce edible wheat, gluten-based films. A film was produced as a standard. Five additional films were then produced by modifying the initial film-forming solution. Modifications included changing the plasticizer, partially substituting wheat gluten with soy protein isolate and corn zein,…
Nucleation, growth and inhibition of barium sulfate-controlled modification with organic and inorganic additives
The crystal habit of barium sulfate formed by the rapid mixing of Ba2+ and SO2–4 containing brines at 95 °C has been investigated and the effects of coprecipitated K+, Mg2+, Ca2+ and Sr2+ ions, supersaturation ratio and barium-to-sulfate mixing ratio on the crystal morphology studied. The most marked crystal morpholog…
Microphase separation of block copolymer solutions in a flow field
Abstract Films of polystyrene–polybutadiene–polystyrene (PS/PB/PS) triblock copolymer and polystyrene‐poly(ethylene/propylene) (PS/PEP) diblock copolymer were cast from toluene solutions subjected to hydrodynamic flow at room temperature using a device based on a novel casting method we term ‘roll‐casting.’ Polymer so…
27Al and 25Mg solid-state magic-angle spinning nuclear magnetic resonance study of hydrotalcite and its thermal decomposition sequence
Solid-state 27Al and 25Mg MAS NMR and X-ray powder diffraction in combination with thermal analysis indicates that synthetic hydrotalcite decomposes thermally in at least three weight-loss steps. The first step, at 250–280 °C, principally involves the loss of the interlayer water, but the appearance of some tetrahedra…
Nitrogen oxide (NO) reduction by activated carbons. 1. The role of carbon porosity and surface area
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNitrogen oxide (NO) reduction by activated carbons. 1. The role of carbon porosity and surface areaM. J. Illan-Gomez, A. Linares-Solano, C. Salinas-Martinez de Lecea, and J. M. CaloCite this: Energy Fuels 1993, 7, 1, 146–154Publication Date (Print):January 1, 1993Publication…
Transition regions and surface melting in partially crystalline polyethylene: A raman spectroscopic study
Abstract Structures of semi crystalline high‐molecular weight polyethylene and their changes with temperature were studied by analysis of Raman spectra. Decomposition of spectra into contributions of an orthorhombic crystalline phase, a meltlike phase, and two kinds of transition regions yields the respective mass fra…
Studies on polyoxo- and polyperoxo-metalates. Part 1. Tetrameric heteropolyperoxotungstates and heteropolyperoxomolybdates
New heteropolyperoxometalates of the type R3[XO4{MO(O2)2}4][R = N(C6H13)4+, N(PPh3)2+ or ⅓[Co(en)3]3+(en = ethane-1,2-diamine); X = P or As; M = Mo or W] have been characterized by IR, Raman and where appropriate 31P NMR spectroscopy. Epoxidation of cyclic and linear alkenes by these species with H2O2 as co-oxidant ha…
Enhanced Mechanical Properties of TiNi Shape Memory Fiber/Al Matrix Composite
A design concept of shape memory TiNi fiber reinforced/Al metal matrix composite (SM-MMC) was proposed. Mechanical tensile properties such as stiffness and yield strength, were improved by the strengthening mechanisms: back stress in the Al matrix induced by stiffness of TiNi fibers and the compressive stress in the m…
Spark-to-glow discharge transition due to increased surface conductivity on epoxy resin specimens
The effects of long exposure of epoxy resin surfaces to partial discharges under AC field stress were examined. The use of electrical pulse measuring techniques in conjunction with light emission measurements using a photomultiplier tube, which allowed simultaneous detection of both spark and glow discharges, permitte…