Materials Literature
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Abstract The mechanism of NH + 4 and K + fixation by clay minerals is similar, yet different analytical methods are used to estimate nonexchangeable (fixed) amounts of these nutrients in soils. Sodium tetraphenylboron (NaBPh 4 ) facilitates the release of nonexchangeable NH + 4 and K + by precipitation of these ions a…
The progressive diffusion of Ni2+ ions into the MgO matrix, with the consequent formation of an NixMg(1–x)O solid solution, occurring during the air calcination of a 19% Ni/MgO catalyst in the range 400–1000 °C, has been monitored by X-ray diffraction (XRD) measurements using monochromatized non-doublet synchrotron ra…
Novel poly(ethylene glycol) (PEG) derivatives having pendant amino groups were prepared by copolymerization of allyl glycidyl ether with ethylene oxide followed by chemical modification of the double bond side chains. Dropwise addition of the mixture of monomers to the anionic initiator gave an almost monodisperse (Mw…
A layered ammonium nickel molybdate was prepared by precipitation from a solution of nickel nitrate and ammonium heptamolybdate. The compound obtained, (NH(4))HNi(2)(OH)(2)(MoO(4))(2), is trigonal with hexagonal unit cell parameters a = 6.0147(4) Å, c = 21.8812(13) Å, and Z = 3. A powder X-ray diffraction pattern was…
Hybrid composites of low density polyethylene (LDPE) reinforced with intimately mixed short sisal and glass fibers were prepared by solution mixing technique. The mechanical properties of these composites have been investigated with reference to the effects of orientation and composition of fibers in them. It has been…
Organic template-directed mineralization of calcite crystals has been probed in situ by external reflection−absorption FTIR spectroscopy in an effort to understand the dynamics of the organic−inorganic interface during crystal growth. The main focus is to elucidate structural changes that may occur in the organic temp…
The new complex tris(4,4,4-trifluoro-1-phenyl-1,3-butanedionate)(1,10-phenanthroline-N-oxide)-europium(III) shows a remarkable luminescence quantum yield at room temperature (66%) upon ligand excitation and a long 5D0 lifetime (670 µs), which makes it a promising light-conversion molecular device.
Biochromic polythiophenes have been synthesized and the interaction of avidin with the biotinylated water-soluble polymers results in stunning chromic effects, opening the way to the detection of numerous biological components.
Extended labeling experiments have shown that formation of rhodium peroxocarbonate from CO(2) and [RhCl(eta(2)-O(2))(P)(3)] (P is PEt(2)Ph or PEtPh(2)) proceeds through O-O bond cleavage and CO(2) insertion. O-transfer to ancillary phosphine ligand to give R(3)P=O selectively (>85%) involves the Rh-linked O atom of th…
Synthesis of a novel new fluorocarbon film is reported. This film is obtained by plasma polymerization of a trimer mixture of substituted perfluorohexenses (C9F18). Use of low duty cycle pulsed or lower energy continuous-wave plasmas provides films in which −CF3 groups are the dominant functional group present. These…
Recovery of proteins and fats from dairy wastewater has two advantages: the recovery process results in a pretreatment of wastewater prior to discharge to municipal sewers; and the recovered sludge can be used as a food additive. Carboxy Methyl Cellulose (CMC) is commonly used for the treatment of dairy wastewater aft…
The creep behavior of Zircaloy cladding materials depends on materials texture, degree of recrystallization, and chemical composition. This study is devoted mainly to the analysis of the effect of the final annealing (i.e., the degree of recrystallization) on the creep characteristics. For this purpose, data from a se…
Preparations of AuCl n in Na−Y zeolite were characterized by means of X-ray diffraction (XRD), ultraviolet diffuse reflectance (UV−vis), Au L III -edge X-ray absorption near-edge structure (XANES), and extended X-ray absorption fine structure (EXAFS). Au 2 Cl 6 was first homogeneously dispersed on the zeolite surface…
The magnetic properties of the compounds (NH 4 ) 21 [{VO(H 2 O)} 6 {Mo(μ-H 2 O) 2 (μ-OH)Mo} 3 {Mo 15 (MoNO) 2 O 58 (H 2 O) 2 } 3 ]·65H 2 O, 1a, (NH 2 Me 2 ) 18 (NH 4 ) 6 [{VO(H 2 O)} 6 {Mo(μ-H 2 O) 2 (μ-O)Mo} 3 {Mo 15 (MoNO) 2 O 58 (H 2 O) 2 } 3 ]· 14H 2 O, 1b, and Na 3 (NH 4 ) 12 [{Fe(H 2 O) 2 } 6 {Mo(μ-H 2 O) 2 (μ-O…
A polar Cr2O3(0001) surface is prepared as an epitaxial film on a Cr(110) substrate. The film is thick enough to represent the bulk surface. Applying a variety of surface sensitive techniques [thermal desorption spectroscopy (TDS), reflection absorption infrared spectroscopy (RAIRS), electron energy loss spectroscopy…
The irreversible adsorption of ethanol and 1,2-ethanediol on platinized platinum has been studied with Fourier transform IR spectroscopy (FTIRS) and differential electrochemical mass spectrometry (DEMS) in perchloric acid electrolyte. The adsorption was found to be dissociative for both ethanol and 1,2-ethanediol. Dur…
Pseudomonas oleovorans was grown separately on 5-(4‘-tolyl)valeric acid, 5-(4‘-ethylphenyl)valeric acid, 5-(4‘-biphenyl)valeric acid, and 8-(4‘-tolyl)octanoic acid either as the sole carbon source or as a coefeed with either nonanoic acid or 5-phenylvaleric acid. For polymer production, 5-(4‘-tolyl)valeric acid was th…
The effects of various surfactants on the interfacial tension between supercritical CO 2 and 600 MW polyethylene glycol (PEG) are reported at 45 °C on the basis of measurements with a novel tandem variable-volume pendant drop tensiometer. The interfacial tension of the CO 2 −polyethylene glycol binary system decreases…
The electron-transfer reactivity of microperoxidase-8 (MP8), the heme octapeptide derived from enzymatic cleavage of cytochrome c, has been studied by nanosecond flash photolysis methods. Ferric MP8 is rapidly oxidized by photogenerated Ru(bpy) 3 3+ in acidic solutions to a ferric cation-radical porphyrin ( k ∼ 5.6 ×…
Biotechnologically produced poly[( R )-3-hydroxybutyrate] (PHB) was subjected to catalytic depolymerization in the melt and in solution. In the melt depolymerization yields crotonic acid beside linear oligomers according to an ester pyrolysis reaction independent of the catalyst used. In solution cyclic oligomers were…