Materials Literature
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The products and the oxidative polycondensation reaction conditions of oligo-3-aminopyridine with H2O2 and NaOCl were studied. In this reaction, NaOCl was observed to be more active than H2O2 and optimum reaction conditions were determined. Oligo-3-aminopyridine (OAP) was synthesized from the oxidative polycondensatio…
A series of crystals of NaxTaS2 with different superconducting transition temperatures (Tc) ranging from 2.0–4.4 K wereobtained by flux method. The structural data deduced from X-ray diffraction pattern shows that the sample has the same structure as 2H-TaS2. Compared with the resistivity curve of un-intercalated samp…
We have investigated the influence of micrometer- and sub-micrometer-scale surface heterogeneities in patterned octadecyltrichlorosilane (OTS) films on human serum albumin (HSA) adsorption and its spatial distribution. 5-μm-wide OTS patterns were created on glass substrates by micro-contact printing and in some instan…
Tris[tetra(15-crown-5)phthalocyaninato]dilutetium(III) ( R 4 Pc ) 3 Lu 2 , whose structure had been confirmed earlier by X-ray analysis, was further examined by physicochemical studies. The redox properties of this complex were investigated by cyclic voltammetry. The spectroelectrochemical study of this compound has b…
A composite of Ti-V-based bcc phase alloy surface-modified by multiwalled carbon nanotubes (MWNTs) was prepared simply by a short-time ballmilling process. The composite sample showed remarkably improved electrochemical hydrogen release capacities. For the 30 min ballmilled sample, a discharge capacity of was obtained…
The n = 1 Ruddlesden–Popper phase Sr4FeMoO8 has been synthesised by high temperature ceramic methods under reducing conditions. Rietveld refinements of the structure against X-ray and neutron powder diffraction data shows that this phase adopts the space group I4/mmm (a = 3.92962(5), c = 12.6707(2) Å) and contains a c…
Investigations carried out on ferroresonant oscillations in a transformer-terminated line due to an energised parallel line on the same right-of-way are reported. A nonlinear approach is used for analysis. The magnetic saturation characteristic of the individual phases of the three-phase transformer is represented and…
We studied the effect of inverter surge voltage for high voltage electrical insulation by using steep fronted and high frequency high voltage pulse generator and model bar coils. In this experiment, we investigate the lifetime and partial discharge characteristics of insulation under surge voltage with various risetim…
In situ X-ray adsorption near-edge structure (XANES) has been used to investigate the formation of chromate conversion coatings on pure Al, commercial Al alloys (AA 1100, AA2024, and AA7075), and a series of binary Al–Cu alloys. The method employed cells designed to determine the growth of the total chromium [Cr(total…
Rapid construction methods for multi storey buildings involve maximising the tasks that can be carried out simultaneously on site. The risks of construction workers, fitting out lower floors, being hit by large objects dropped during installation can be managed by understanding the protection provided by the intermedi…
Early HistoryIf defined as the use of a specific compound discovered as the result of a systematic search for a cure for a specific disease, then chemotherapy is less than a century old.The first example was the introduction in 1910 by Paul Ehrlich 1,2 of an organoarsenic compound he named Salvarsan, which provided th…
Polyhydroxyamides(PHAs) having poly(ethylene glycol)methyl ether (MPEG) and/or dimethylphenoxy pendant groups were synthesized by solution polycondensation at low temperature. The inherent viscosities of the PHAs measured at in DMAC or DMAc/LiCl solution were in the range of . This precursor polymers were studied by F…
Synthesis of wholly aromatic polyketones, i.e., polymers having backbones consisting of aromatic rings and ketonic carbonyl groups, via electrophilic aromatic acylation reaction and/or nickel complex-mediated aromatic coupling polymerization has been developed. Introduction of 2, 2'-dimethoxy-5, 5'-biphenylene, 2, 2'-…
Le vieillissement d’un matériau est caractérisé par une évolution lente et irréversible suite à la combinaison de sollicitations mécaniques, d’interactions avec son environnement et de sa propre instabilité. Cet article s’intéresse plus spécifiquement aux phénomènes de vieillissement physique des matériaux polymères.…
Water concentration, Cw, and the mean effective diffusion coefficient of water, Dw, were measured by vacuum hot extraction coupled with mass spectrometer evolved gas analysis (VHE). The study includes silica, soda- and potassium-lime-silica, cordierite, and lamp bulb glasses of water concentrations between 0.017 and 0…
Crystal structures of protein-ligand complexes provide a detailed view of their spatial arrangement and interactions. In the case of stable, unreactive ligands, such as inhibitors or allosteric regulators, the complexes can be generated by cocrystallization or by soaking the ligand into fully grown crystals. In order…
The magnetic and structural properties of substituted Ba hexaferrite M-type samples with composition BaFe12 2x(Me1 − Me2)xO19,where Me1 = Zn, Co, Ni, and Me2 = Zr, Ti, were compared. The powder samples with 0.0 ≤ x ≤ 0.6 were prepared by two processing routes. Different Fe/Ba ratio was used for mechanical alloying (Fe…
In this study, an organic–inorganic nanocomposite material of cross-linked poly(acrylic acid) (PAA) doped with fine particles of copper iodide (CuI) was prepared. The preparation method of the composite involved the complexing of PAA film with polyiodide ions such as I3− and I5− by immersion in an iodine–potassium iod…
The polarization and charge transport properties of unfilled epoxy were investigated both experimentally and theoretically. The investigations included the measurements of volume currents and also internal space charges on epoxy samples of mm thicknesses. The current versus time relations were shown to correspond well…
Octadecylammonium in monolayers transforms into a carbamate derivative, as observed by attenuated total reflection Fourier transform infrared (ATR-FTIR) spectroscopy and 13C nuclear magnetic resonance (NMR) spectroscopy.