Materials Literature
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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…
Treatment of two equivalents of the sodium β-diketiminate Na(L–L) 1 with a lanthanide metal(III) chloride, LnCl 3 , yielded the mononuclear complex [Ln(L–L) 2 Cl] (Ln = Ce 3, Pr, Nd 5, Sm or Yb); similarly, two equivalents of 1 with TmI 3 gave [Tm(L–L) 2 I] [L–L = N(R)C(Ph)C(H)C(Ph)NR; R = SiMe 3 ]. When 3 was mixed w…
Polyrotaxanes were synthesized as novel biodegradable polymers with supramolecular assembly and their properties evaluated in vitro. The synthesis of biodegradable polyrotaxanes consists of three steps: preparation of an inclusion complex consisting of alpha-cyclodextrins (alpha-CDs) and amino-terminated poly(ethylene…
Molar absorption coefficients of water in glasses of arc magma compositions have been determined for ∼2.8 μm, ∼2.2 μm, and ∼1.9 μm bands. Excellent agreement was found between the water contents calculated from the absorption peak heights and those determined by H2 manometry when the following molar absorption coeffic…
A new laboratory test for evaluating the tracking and erosion performance of HV outdoor polymeric insulating materials is described. The materials evaluated include various formulations of HTV (high temperature vulcanized) silicone rubber and polyolefin polymers. The test is based on combining some features of the AST…
Surface modifications have great potential to control semiconductor properties such as band bending (BB) and electron affinity (EA). It is demonstrated that tailor‐made, surface‐binding molecules—discarboxylic acid derivatives with aromatic substituents in this case—can be used to modify systematically both the EA and…
Glass, nitinol, and pyrolytic carbon surfaces were grafted with poly (ethylene oxide) (PEO) and PEO-containing Pluronic surfactants by gamma irradiation. These substrates were coated with a primer layer of trichlorovinylsilane (TCVS), which allows grafting of organic polymers. The TCVS-coated substrates were adsorbed…
An amphoteric surfactant templating route permits the synthesis of hexagonal mesophases of zirconium compounds by self-assembly of the surfactant and soluble zirconium species in aqueous solution.
A systematic study on the possibility of Young's contact angle determination from Washburn's equation was performed using the so-called thin-layer wicking technique in which the rate of penetration of a liquid into the porous layer of a solid is measured. Commercial (Merck) SiO2 deposited on the glass plate for thin-l…
Time-resolved EPR studies were made on CIDEP mechanisms in the system of excited triplets (T) and doublets (D) using various kinds of porphyrins and nitroxide radicals. The CIDEPs were investigated by observing both signals of T and D and discussed in terms of an electron-spin polarization transfer (ESPT) and a radica…
The SAC (symmetry adapted cluster)/SAC-CI method was used to calculate the ground and excited states of free base phthalocyanine (FBPc). This is the first accurate ab initio study of the excited states of FBPc. The calculated electronic spectrum agrees reasonably well with experimental results with regard to both ener…