Materials Literature
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The modification of argon plasma-pretreated single-crystal Si(100) wafer surfaces via the UV-induced graft polymerization of poly(ethylene glycol) methacrylate (PEGMA) macromonomer (molecular weight approximately 340) for biomaterials applications was explored. The modified Si(100) surfaces were characterized by X-ray…
The study of BaTiO3 crystallization from X-ray amorphous (Ba,Ti) polymeric organic powders has been carried out by comparing samples previously heat-treated in air at 250 and 400 °C. From thermal analysis, X-ray diffraction, infrared and Raman spectroscopies, and 13C NMR spectroscopy, it has been found that the BaTiO3…
This work reports the use of polythiophene films as supporting matrix for Pt particles. The polymer film hosts were prepared using a strong acid aqueous solution, impregnated with Pt particles, and then tested for electrocatalytic properties for the oxygen reduction reaction (ORR). Cyclic voltammetry shows that the re…
One-electron reductions of [Cl(dppe)2RuCCCR2]PF6 (R = Ph, Me) and [Cl(dppe)2RuCCCCCPh 2]PF6 with Co(C5H5)2 provide radical species with the unpaired electron localized on the trisubstituted carbon atom of the cumulene moiety as shown by hydrogen atom capture and EPR spectroscopy.
There are two eutectic reactions in the Al203–rich portion of the AI2O3-Y2O3 pseudo–binary system; one is the equilibrium A1203–YAG eutectic reaction at 1826%C, and the other is the metastable A1203–YAP eutectic reaction at 1702%C. Selection of the A1203–YAG and the A1203–YAP eutectics was examined in terms of cooling…
SUBTITLE: AUTOMATION ON THE FLIGHT DECK PRODUCES SOME IMPORTANT BENEFITS BUT CAN ALSO BRING TRAINING CHALLENGES, MODE CONFUSION AND NEW POSSIBILITIES FOR ERRORS. WITH THIS IN MIND, DESIGNERS OF A MODERN ELECTRONIC CHECKLIST MADE A SPECIAL EFFORT TO ENSURE THIS AUTOMATED COCKPIT TOOL WOULD NOT INTRODUCE NEW ERROR MODES.
Here we report on the synthesis and phase formation of perovskite 0.75 Pb(Zn1/3,Nb2/3)O3–0.25 BaTiO3 (PZN–BT) by means of a new aqueous solution–gel method. The gelation process was optimized for an ammonium PZN acetate citrate precursor. The chemical homogeneity of this precursor was investigated by means of TEM–EDX…
Hierarchical zeolite structures with designed shapes were fabricated by a ceramic processing method—gel-casting of colloidal nanocrytal suspensions.
The reaction of 2,2'-bisdipyrrins 1, 2, and 3 with manganese(II) acetate tetrahydrate and molecular dioxygen yields the manganese(III)corroles 4, 5 and 6, which are readily demetalated to the respective free-base corroles.
The synthesis, characterization, and electrochemical and spectroscopic properties of a new family of dendrimers comprising a 4,4′-bipyridinium core and 1,3-dimethyleneoxybenzene-type dendrons are described. The electrochemical results show that there is no significant inhibition of electron transfer involving the dend…
The pressure dependences of the phonon lifetimes of zone-center optical phonons of various group IV and III–V semiconductors are calculated from first principles using third-order density-functional perturbation theory. The microscopic mechanism responsible, i.e. the anharmonic decay of a phonon into phonons of differ…
Evidence for Reversible Formation of Metallic Cu in Cu0.1 V 2 O 5 Xerogel Cathodes during Intercalation Cycling of Li + Ions as Detected by X-Ray Absorption Spectroscopy , Giorgetti, Marco, Mukerjee, Sanjeev, Passerini, Stefano, McBreen, James, Smyrl, William H.
The water soluble poly(ferrocenylsilane) polycation, poly(ferrocenyl(3-ammoniumpropyl)methylsilane), was synthesized by transition metal-catalyzed ring-opening polymerization of the novel [1]ferrocenophane Fe(η-C5H4)2SiCH3(CH2)3Cl and by subsequent side group modification. Amination of the chloropropyl moieties using…
We report the formation of host-guest complexes between water-soluble calix[n]arene-p-tetrasulfonates (n = 4, 6, 8) or 2-hydroxypropyl-cyclodextrins (alpha-, beta-, gamma-) and the tetratosylate salt of 5,10,15,20-tetrakis(4-N-methylpyridyl)porphyrin (TMPyP). The binding constants ranging between 10(2) and 10(5) M-1 w…
OBJECTIVE: To investigate the effects of Absorbitol on body weight, anthropometry, body composition, blood pressures and lipid profiles in obese, hypercholesterolaemic subjects without dietary restriction. DESIGN: A randomised, double blind. Placebo-controlled study. SUBJECTS: Normal volunteers with no history of chro…
Abstract Thioantimonates, Solvothermal Synthesis, Chalcogenides The reaction of elemental manganese, antimony and sulfur with ethylamine under mild solvothermal conditions yielded a thioantimonate(III) with composition Mn 2 (EA) 2 Sb 2 S 5 (EA = C 2 H 5 NH 2 ) that is a new member of a series of polymeric manganese th…
A novel mesoporous iron phosphate, possessing a specific surface area of 254 m2 g−1 and average pore diameter of 2.6 nm, is synthesized using a fluoride route.
A green process, using a recyclable tungstate-exchanged Mg-Al layered double hydroxide (LDH-WO4(2-)) heterogenised catalyst and aqueous H2O2 oxidant in water, leads to N-oxidation of aliphatic tert-amines to amine N-oxides in quantitative yields, at a high rate at room temperature.
A new structural family of heteropolytungstate complexes containing trans-dioxo uranium(VI) (uranyl) groups has been isolated in good yield by reaction of UO22+ with [NaAs4W40O140]27− (W40) in aqueous solution. The “lacunary” anion, [(UO2)3(H2O)5As3W29O104]19−1 is formed by the reaction of W40 with UO2(MeCO2)2 at pH 7…
New perylene–porphyrin dyads have been designed that exhibit superior light-harvesting and energy-utilization activity compared with earlier generations of structurally related dyads. The new dyads consist of a perylene mono(imide) dye (PMI) connected to a porphyrin (Por) via an ethynylphenyl (ep) linker. The PMI–ep–P…