Materials Literature
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SUMMARYThis paper examines some of the problems associated with the replacement of cadmium plating for the protection of aircraft components and fasteners manufactured from steel. It reviews the range of coatings which are available commercially and are currently being considered as alternatives to cadmium plating. Re…
Nominally pure SrTiO3 has been studied by dielectric spectroscopy using small (linear regime) as well as large electrical fields (non-linear regime) up to 1 kV mm−1. In addition measurements of the specific heat and its field-dependent contribution have been carried out. The field dependence of the dielectric constant…
Poly(ethylene glycol) of M n 200 g/mol (PEG-200) was added to cultivation media of Alcaligines eutrophus during polymer formation, and the carbon source used was 4-hydroxybutyrate. The addition of PEG-200 from 0 to 2 wt % resulted in increased 4-hydroxybutyrate (4HB) incorporation from 66 to 86 mol % into the poly(3-h…
Reaction of Ti(OBut)4 with about 1 equivalent of water in tert-butyl alcohol for 5 d at 100 °C yielded the polytitanate complex [Ti18O28H][OBut]17. A single-crystal X-ray diffraction study of its ButOH solvate [a= 15.789(4), b= 29.544(5), c= 27.496(5)Å, β= 91.85(5)°; Z= 4; space group P21/c–C2h5] revealed a Ti18O45 me…
A novel cross-linked pyroelectric polymer with pronounced second-order nonlinear optical properties has been prepared. A multistep synthesis with several selective transformations including a kinetic resolution (transesterification) with the highly enantioselective Candida antarctica lipase B, yielded the monomer 4‘‘-…
The behaviour of luminescent (Eu, Tb) and highly paramagnetic (Gd) complexes of 1,4,7,10-tetraazacyclododecane containing one carboxamide and three phosphinate substituents has been studied in solution. Analyses of variable-temperature nuclear magnetic relaxation dispersion profiles indicate that there is no water mol…
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…