Materials Literature
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We investigated the effects of pH, ionic strength, catalyst, and initial concentration on both decomposition of 2-chlorophenol (2-cp) and removal of total organic carbon (TOC) in aqueous solution with ultrasonic amplitude 120 μm and H 2 O 2 (200 mg/l). When the initial concentrations of 2-cp was 100 mg/l and the pH wa…
The Wilhelmy plate technique was used to measure the dynamic surface tension of poly( N -isopropylacrylamide)(poly(NIPAM)) at the air−water interface as a function of poly(NIPAM) concentration and temperature. Initial periods of a negligible decrease of the dynamic surface tension were observed at the lowest concentra…
The crystal and molecular structure of [{Cu(bpzt)}2]·3H2O [H2bpzt = 1,3-bis(pyrazol-3-yl)triazene] was determined by X-ray diffraction methods. The complex has a quasi-planar dinuclear structure with an asymmetric double pyrazolate bridge. The asymmetry results from the presence, on the C3 of each bridging pyrazolate,…
NH4NiPO4·6H2O and NH4NiPO4·H2O have been obtained by adding different concentrations of H3PO4 to dilute solutions of NiCl2·6H2O with special attention to the control of the pH in the solvent medium, which was regulated by addition of NH4OH. The NH4NiPO4·6H2O compound crystallizes in the orthorhombic Pmn21space group w…
The Ti + 2B exothermic chemical reaction was used in combination with a high‐velocity forging step to produce dense TiB 2 ‐(20 vol%)SiC composites. Densities in excess of 96 % of the theoretical were achieved for both SiC particulate and fiber additions. X‐ray diffractometry revealed the products of the reaction to be…
The degree of orientation in thermotropic liquid crystalline polymer films has been determined as a function of the draw ratio using a specially developed spectrographic birefringence technique, diffuse reflectance infrared spectroscopy (DRIFT), and wide-angle X-ray scattering (WAXS). Quantitative measurements of the…
CVD boron nitride films have been deposited at 800 °C from diborane, ammonia, and hydrogen gas mixtures, using different B 2 H 6 flow rates. The effect of the [B 2 H 6 ]/[NH 3 ] ratio in the gas mixture on the structure, composition, and the stability of the layers in humid atmospheres has been studied. For low [B 2 H…
2-Propanol decomposition at 200 °C on magnesium oxide prepared by the hydrolysis of magnesium ethoxide (sol−gel method) is reported. With hydrochloride acid, acetic acid, or ammonia as hydrolysis alkoxide catalysts, the acidity and the selectivity to propene of the catalysts follow the sequence, MgO (HCl) > MgO (aceti…
Mathematical models that have been proposed for creep in ceramics are described. Emphasis is on models involving grain boundary motion (sliding or flow). In Lifshitz models the crystalline grains elongate with strain; the elongation results from diffusion, slip, or solution and precipitation. In Rachinger models the g…
Plasma polymerization of hexamethyldisilane ([CH 3 ] 3 SiSi[CH 3 ] 3 ) and tetramethylsilane ([CH 3 ] 4 Si) has been investigated by XPS, FTIR, solid state NMR, and plasma emission diagnostics. Thin carbosilane films and powders can be deposited by this method. Hexamethyldisilane is found to undergo glow discharge pol…
The series of tetrakis(μ-N,N‘-diarylformamidinato)dinickel(II), where the aryl is the phenyl modified with various substituent (X), is synthesized and thoroughly characterized. While both the coordination geometry and the UV−vis spectra remain essentially independent of X across the series, the one-electron oxidation…
Configurational and ligand conformational influences on the kinetics of (1)A(1) right harpoon over left harpoon (5)T(2) spin crossover in the Fe(II) complex with the novel tripodal ligand, 1,1,1-tris((N-(2-pyridylmethyl)-N-methylamino)methyl)ethane (tptMetame), have been explored. Despite having six chelate rings and…
The crystal growth rates of NH 4 H 2 PO 4, KH 2 PO 4, (NH 4 ) 2 SO 4, KAl(SO 4 ) 2 ·12H 2 O, NaCl, and glycine and the nucleation rates of KBr, KCl, NaBr·2H 2 O, (NH 4 ) 2 Cl, and (NH 4 ) 2 SO 4 were expressed in terms of the fundamental driving force of crystallization calculated from the activity of supersaturated s…
[NEt 4 ] 2 [enH] 2 [Ge 2 Se 6 ] and [NEt 4 ] 4 [Sn 4 Se 10 ] have been synthesized electrochemically by the reduction of metal chalcogen alloys in an electrolyte solution of NEt 4 Br in ethylenediamine. The structures of both compounds have been determined by single-crystal X-ray methods. [NEt 4 ] 2 [enH] 2 [Ge 2 Se 6…
The shear response of polymer brushes is explored as a function of grafting surface curvature using the Alexander−deGennes ansatz, where the free ends of the chains are localized at the tip of the brush and all tethered chains in the brush are stretched equally. Brushes adsorbed onto the concave and convex surfaces of…
Changes in shape of internally pressurized tubes caused by operating temperatures and pressures are enhanced by fast neutron irradiation. Lengths and diameters of Zr-2.5Nb pressure tubes in CANada Deuterium Uranium-Pressurized Heavy Water (CANDU-PHW) power reactors and test reactors have been monitored periodically ov…
Electron radiation induced hydrocarbon contamination can be either a problem or a useful tool in electron beam analyses and lithographies. We have used atomic force microscopy to study electron beam written contamination structures. Contamination is shown not only to arise from the primary electron beam but also from…
(Tetraphenylporphyrinato)zinc(II) covalently linked with pyridine at the ortho position of one of the four phenyl rings exists as a stable pentacoordinated complex while a temperature dependent “tail-on” and “tail-off” binding mechanism is operative for the meta-substituted derivative. The axially bound pyridine does…
Streptomyces griseus produced a certain kind of flocculating substance(s). The flocculating substance(s) could aggregate suspended kaolin particles in solution to form small floes and enables it to sediment those particles. The production of flocculating substance(s) by S. griseus was not parallel to the cell growth a…
Solid state 13 C CP/MAS studies of poly(vinyl chloride) (PVC)−bis(2-ethylhexyl) phthalate (DOP) have been carried out to elucidate the dynamics of polymer−plasticizer interaction at the molecular level. 13 C NMR spectra, spin−lattice relaxation time T 1 (C) and spin−spin relaxation time T 2 (C) were obtained for vario…