Materials Literature
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Flocculation of colloidal silica with aluminum fractal polymers was investigated by 27 Al magic angle spinning and 29 Si cross polarization magic angle spinning NMR as a function of aluminum concentration and pH. Aluminum flocculant species were prepared by dilution of a commercially available flocculant, WAC HB, the…
Spherical equally sized mixed copper−zinc basic carbonates and Zn-doped tenorite particles have been prepared by coprecipitation from copper−zinc nitrate solutions that become homogeneously alkaline by the hydrolysis of urea at 363 K. The nature of the synthesized solids depends on the initial zinc to total metal mole…
In this study the properties of DL-lactide (DL-LA) copolymers with 5, 10, 15, 20, and 30 wt % (in feed) of epsilon-caprolactone (epsilon-CL) polymerized with stannous(II)octoate (SnOct) as catalyst and glycerol, laurylalcohol, or pentaerythritol as initiator were investigated. Thermal studies showed that the addition…
The complexes [AuI(PPh 3 )] 1, [Au 2 (µ-dppm)Cl 2 ] 2 [dppm = bis(diphenylphosphine)methane], [Au 2 (µ-dppm)I 2 ] 3, [Au 3 (µ-tppm)Cl 3 ] 4 [tppm = tris(diphenylphosphino)methane], [Au 3 (µ-tppm)I 3 ] 5, [Au 3 (µ-dpmp) 2 Cl 2 ]Cl 6 [dpmp = bis(diphenylphosphinomethyl)phenylphosphine] and [Au 3 (µ-dpmp) 2 I 2 ]I 7 were…
Preface. I: Plasma Based Vacuum Deposition Processes to Enhance Wear and Corrosion Performance. II: CVD Processes to Enhance Corrosion and Wear Protection. III: Solid Lubricant Coatings: Their Performance and Applicability at Temperature Extremes. IV: Amorphous Carbon Solid Lubricant Films Deposited by Conventional an…
A co-polymer of O-methyl polyethylene(glycol)-O'-succinate (MPEGs, m.w. 5100) and poly-l-lysine (PL, median m.w. 32700, degree of polymerization 256) has been synthesized by covalent grafting. The resultant MPEGs-PL (30% modification degree of epsilon-amino groups) had a hydrodynamic diameter corresponding to a 690 kD…
Fully integrated microinductors and microtransformers based on two different geometries and ferrite composite materials are designed, fabricated, tested, and compared. These devices are based on screen printed polymer/ferrite composites and electroplated copper coils, and are deposited at low temperature, making them…
The pulsed electroacoustic method (PEA) has been applied to observe space charge formation under ac application (7 kV/sub pk/, 50, 0.1 and 0.001 Hz) in water-treed polyethylene samples in order to understand the degradation mechanism of water trees. A system with phase-resolving capability has been developed to measur…
Expression: Expression or pressing is a process in which liquid contained in pores in a solid matrix or contiguous array of solid matrices or particles is expelled by compaction or squeezing. The pressed mixture is often called a “presscake”, or “cake” for short. Mechanically-, hydraulically- and pneumatically-driven…
Ultrafine 5.5 mol% CeO 2 —2 mol% YO 1.5 ZrO 2 powders with controllable crystallite size were synthesized by two kinds of coprecipitation methods and subsequent crystallization treatment. The amorphous gel produced by ammonia coprecipitation and hydrothermal treatment at 200°C for 3.5 h results in an ultrafine powder…
Phase diagrams of binary mixtures of the non-mesogenic N -(p -methoxy- o -hydroxybenzylidbe ene)- p -aminopyridine with a series of p - n -alkoxybenzoic acids ranging from methoxy to hexadecyloxy were established using differential scanning calorimetry and polarising optical microscopy. The key results obtained are: (…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTMechanism of Reaction of Reduced Polyoxometalates with O2 Evaluated by 17O NMRDean C. Duncan and Craig L. HillView Author Information Department of Chemistry, Emory University Atlanta, Georgia 30322 Cite this: J. Am. Chem. Soc. 1997, 119, 1, 243–244Publication Date (We…
One of the promising candidates for ferroelectric substrate materials, lanthanum monoaluminate (LaAlO 3 ), was successfully synthesized by two separate chemical powder preparation techniques: (i) homogeneous precipitation from aqueous solutions containing urea (CH 4 N 2 O) in the presence of nitrate salts, and (ii) se…
Long-term field experiences of ageing and performance of polymeric silicone rubber (SIR) and ethylene-propylene-diene monomer (EPDM) insulators under natural contamination conditions in an outdoor installation are presented. The primary aim of the work is to study the interrelation between surface conditions and the e…
Polyacrylamide–silver nanocomposites with a silver particle size distribution ranging from 2 to 20 nm in a polyacrylamide matrix are synthesized by γ-irradiation at room temperature.
Hydrothermal reaction of lacunary [(PO4)W11O35]7- with rhodium acetate dimer yields the novel dirhodium-substituted Keggin anion, [(PO4)W11O35{Rh2(OAc)2}]5- (1). An X-ray structure determination of the guanidiunium salt of the dimethyl sulfoxide derivative of 1 confirms the structure deduced from proton and tungsten N…
Photoluminescence and photocatalytic H 2 evolution reactions of layered caesium titanates, Cs 2 Ti n O 2n+1 (n =2,5,6), have been studied to evaluate the photoactivity of these materials. Cs 2 Ti 2 O 5 showed a broad emission around 420 nm upon excitation at 270 nm at 77 K, while both Cs 2 Ti 5 O 11 and Cs 2 Ti 6 O 13…
For pt.I see ibid., vol.20, no.4, pp.384-91 (1997). The purpose of the second part of the DELPHI survey paper is twofold. First, to describe the experimental methods that have been developed to validate the numerical models generated to characterize a certain electronic part in full detail and second, to highlight the…
The preparation of spherical Y2O2S and Y2O2S:Eu particles using a solid–gas reaction of monodispersed precursors with elemental sulfur vapor under an argon atmosphere has been investigated. The precursors, undoped and doped yttrium basic carbonates, are synthesized by aging a stock solution containing the respective c…
Irradiation of lysozyme in frozen states in the absence of oxygen induces specific fragmentation at defined sites along the backbone chain. This paper localizes radio-fragmentation sites by two methods. First, N-terminal sequencing of radiolysis fragments after separation by SDS-polyacrylamide gel electrophoresis and…