Materials Literature
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Silica gel with a specific surface area, SBET, of 322 m2 g–1, and an average pore diameter of 6 nm, has been chemically modified with NbV oxide by a grafting reaction. The quantity of attached atoms was 8.9 × 10–2 mol g–1 with a surface density of 1.7 atoms nm–2. The XPS technique showed that the atomic Nb/Si ratio of…
The formation of a mesophase in α‐sexithienyl is reported which cannot be identified as either a nematic or smectic phase. On heating, it is also shown that, through careful control of the reaction conditions, crystalline polythiophene comparable in quality with that prepared by electrosynthesis or other synthetic met…
The kinetics of dissolution of differently prepared amorphous aluminosilicate precursors having various Si : Al molar ratios have been studied by measuring the change in the aluminium and silicon concentrations in the liquid phase as well as the change in the degree of Si polycondensation in the liquid phase during th…
Three new low-molar-mass liquid crystals are reported, each of which shows remarkable phase behaviour. One of the materials exhibits a temperature-dependent unwinding of the helix in the cholesteric (chiral nematic) and chiral smectic C phases. This is the first example of a single, pure material to show both of these…
Partial table of contents: Formulation Development (E. Wickson). Solution Vinyl Resins (K. Szoc & R. Burns). PVC Latexes (J. Goots & M. Moore). Monomeric Plasticizers (L. Krauskopf). Epoxy Plasticizers (J. Lutz). Lead Stabilizers (B. Engelbart). Lubricants (R. Grossman). Carbonate Fillers (T. Ferrigno & E. Wickson). C…
A molecular bowl has been prepared by constructing a metalloporphyrin on one face of a tetrameric cyclocholate; the bowl selectively binds morphine by a combination of nitrogen–metal ligation and hydrogen bonding.
A non-formaldehyde crease-resistant finishing method for silk has been developed by using citric acid as a crosslinking agent. Both the dry and wet resiliency of finished silk were remarkably increased. The finished silk had a dry wrinkle recovery degree (WRD) of more than 280° compared to 265° and 217°, respectively,…
Abstract This study shows that principal component analysis (PCA) in conjunction with iterative target transformation factor analysis (ITTFA) is able to provide an independent estimate of the number, position and, to a certain extent, the shape of spectral components required to describe the Mo 3d envelope as monitore…
The solvation of (2,3,7,8,12,13,17,18-octabromo-5,10,15,20-tetraphenylporphyrinato)zinc(II)[Zn(obtpp)], in twelve different solvents results in large red shifts of the B and Q bands of the porphyrin accompanied by enhanced absorbance ratios of the Q bands. These observations are ascribed to the destabilisation of the…
Investigation of the interaction between the 4,4′-bipyridinium(2+) cation (4,4′-H2bipy2+) and the octacyanometalates(IV)[M(CN)8]4–(Mo or W) led to the isolation of [4,4′-H2bipy]2[W(CN8)]·4.5H2O and its isomorphous molybdenum analogue. The spectroscopic properties of both and the X-ray structural characterization of th…
A discrete dynamic model of a magnetic core including hysteresis, eddy current and anomalous losses is proposed. It is suitable for thin laminations and features a simple formulation and fast calculation. The calculations and measurements of an annular ring under different wave forms are presented. The model can be ex…
Abstract Differential scanning calorimetry and X‐ray diffraction experiments on ß‐nucleated poly(propylene) were made on samples crystallized at different temperatures. The crystal perfection was shown to vary with crystallization temperature. The observed multiple peaks could be related to a ß 1 ‐phase with defective…
The surface nature and the composition of AlN powder, as‐received and exposed to binder burnout, were studied using XPS and TEM. The surface of as‐received AlN powder was covered by a thin layer of aluminum oxynitride and oxide mixture. A small portion of residual carbon from binder burnout was bound to oxygen atoms o…
Recent progress in the research and development of electrical insulation for modern electric power systems is reviewed. Cross-linked polyethylene cables, gas-insulated switchgear, composite insulators and oil-immersed transformers are covered. A number of aging processes are presented and analyzed. Typical aging proce…
The hexanuclear complex of calcium oxo ethoxide ethanol solvate, [Ca6O2(OEt)8]·14EtOH 1 has been isolated after the prolonged refluxing of an ethanol solution of calcium ethoxide in the presence of the oxygen in air and studied by X-ray diffraction; the metal-oxygen framework is built of two [Ca4O4] cubes sharing a co…
Abstract The percolation model is used to interpret the brittle‐ductile transition of HDPE/CaCO 3 blends. The percolation threshold (θ sc ) for HDPE/CaCO 3 blends is found to be 0.52, which is equal to π/6. The critical exponent ( g ) is found to be 0.83 for HDPE/CaCO 3 blends. The toughening efficiency of blends whic…
31 P Magic-angle spinning nuclear magnetic resonance (MAS NMR) spectroscopy of a series of Ca phosphate glasses yields the following results and conclusions: (1) The relative concentrations of Q1, Q2, and Q3 P-tetrahedra are consistent with theoretical expectation and previous experimental work, except that near the m…
The crystallization and transformation behavior of the polymorphs of L-histidine (A, B) and the transformation kinetics were investigated in aqueous solutions. Both polymorphs precipitate in almost the same ratio from solutions in a wide concentration range. The ratio of the polymorphs. in the precipitate was scarcely…
For pt.I see ibid., vol.8, no.1, p.246-54. Simulation data for the magnetizing inrush current generated by power transformers, obtained in part one, are used for harmonic analysis. The simulation results show very good agreement with experiment results. The relationship of the harmonics to all parameters is discussed.…
The effects of dissolved oxygen, hydrogen, and hydrogen peroxide on the corrosion (electrochemical) potentials (ECPs) of type 304 SS and alloy 182 in simulated boiling water reactor (BWR) coolant environments under various water chemistry conditions at 288°C are reported. In oxygenated systems, the measured ECP fell w…