Materials Literature
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195 Pt n.m.r. data are reported for [Ptn(CO)2n]2–(n= 3, 6, or 9) and, when n= 9, the spectra are consistent with rotation of the outer Pt3-triangles with respect to the middle triangle about the principal 3-fold axis; inter-exchange of Pt3-triangles occurs in mixtures of [Pt9(CO)18]2– and [Pt12(CO)24]2– at 25°C.
Abstract When used as a thickening agent in aqueous suspension, hydrolyzed starch–polyacrylonitrile graft copolymer (H‐SPAN) has broadly variable rheological properties, such as viscosity, storage modulus, and stress overshoot characteristics. A series of H‐SPAN preparations with variable swelling ratio Q were made by…
The real part R and the imaginary part X of the shear impedance for the nematic liquid crystal p-n-pentyl p'-cyanobiphenyl (PCB) were measured at 15 MHz. R and X are found to be equal in the nematic phase. Anisotropic viscosity coefficients are deduced from these measurements and the Rapini equality is verified.
Abstract A fast discharge flow apparatus equipped for EPR detection of radicals has been used to investigate the reaction O + HBr → OH + Br. At 295°K, measurements showed that more than 97% of all OH produced in this reaction was formed initially in its first vibrationally excited state. Rate constants for physical de…
Polyethylene adipate (PEA)-degrading enzyme of Penicillium sp. strain 14-3 was purified by precipitation with ammonium sulfate and chromatography with CM-Sephadex C-50. The purified enzyme was confirmed to be homogeneous by ultracentrifugal analysis and polyacrylamide gel electrophoresis. Some properties of the purifi…
The co-ordination geometry of the NiII complex with the new macrocyclic ligand L, which contains a side chain, is controlled by the pH of the solution, the square-planar yellow diamagnetic form and the octahedral blue paramagnetic one being stable below and above pH 6·3, respectively.
Nuclear fuels for the high‐temperature gas‐cooled reactor (HTGR) consist of spherical kernels of actinide compounds contained in gaslight pyrolytic carbon and SiC. The fuel kernels migrate up the temperature gradient and into the coating layers. A theoretical analysis of in‐reactor migration data indicates that a soli…
Abstract The solid, water‐insoluble sorbent called Super Slurper that swells in water is a base hydrolyzed starch‐polyacrylonitrile graft copolymer in which the nitrile functionality has been converted to a mixture of carboxamide and alkali metal carboxylate. A process for making the polymer in multipound quantities h…
Abstract Reactions of OH( v = 1) with HBr, O, and CO have been studied at 295°K using a fast discharge flow apparatus: equation image The reaction O + HBr → OH( v = 1) + Br was used as a source of OH( v = 1), and subsequent chemical reactions of the excited radical were followed using EPR spectroscopy. Rate constants…
Mössbauer data for a large number of gold(I) complexes are presented. From these data and previously published work it is concluded that: (i) the bonding involves only 6S and 6p orbitals; (ii)π acceptance by ligands from gold is negligible; (iii) the gold atom tends to concentrate S character in bonds to such ligands…
Data on irradiation growth of Zircaloy is presented. Irradiation growth is defined as irradiation-induced changes in dimensions in the absence of an applied stress. It is shown that the primary variables are fluence, irradiation temperature, amount of prior cold work, heat treatment, and texture. For recrystallized Zi…
The Alexander-Kaplan method is applied to analyse the E.S.R. spectra of symmetrical three-spin systems, undergoing fast, intermediate and slow rotational diffusion in nematic liquid crystals. Particular emphasis is given to the slow-motional region. The line shapes are calculated from a spin hamiltonian, which conside…
The Avcothane 51 elastomer, a member of a series of proprietary materials best characterized as polyurethane/poly(dialkylsiloxane) block copolymers, displays considerable hemocompatibility without any incorporated anticoagulants. In the form of intra-aortic balloons, the elastomer was implanted in several thousands of…
The rates of oxidative addition of methyl iodide to the comolexes [PtR2(bipy)][bipy = 2,2′-bipyridyl; R = Me, Ph, 4-XC6H4(X = F, Cl, Me, or OMe), and 3-XC6H4(X = F or OMe) have been studied.The second-order rate constants follow the series R = Me > 4-MeOC6H4 > 4-MeC6H4 > 3-MeOC6H4 > Ph > 4-FC6H4 > 4-ClC6H4 > 3-FC6H4,…
Neutron diffraction study was carried out on single crystals of the perovskite oxide SrFeO 3- x ( x =0.1). SrFeO 3- x ( x =0.1) has a proper screw spin structure with the propagation vector parallel to [111] direction and its Néel temperature is 118 K. The electron configuration of Fe 4+ (3 d 4 ) ion is close to the l…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation Russell J. Boyd; Electron density partitioning in atoms. J. Chem. Phys. 1 January 1977; 66 (1): 3…
A free-ion-model crystal-field calculation has been performed for YAl${\mathrm{O}}_{3}$:${\mathrm{Er}}^{3+}$. A free-ion calculation was done by fitting a free-ion Hamiltonian, which included Coulomb, spin-orbit, configuration, spin-spin, and spin-other-orbit interactions. The coefficients which gave the best least-sq…
Possible losses of trace elements during dehydration of marine zoological material with a high water content were studied by means of radioactive tracers, using the oyster Crassostrea gigas as an example. It is probable that no losses occurred with chromium, iron, manganese, cobalt and zinc, but serious losses of sele…
Analytical methods are given which enable one to describe geometrically layers of large curvature in a smectic phase. Dupin cyclides in focal domains are taken as examples. The curvature energy of focal domains is calculated. The difference between normal focal domains (built on an ellipse and an hyperbola), and parab…
The possibility of the smectic A to C phase transition is discussed, using a model based on the dipole-dipole interaction of the polar bonds of the molecules, which are supposed to rotate randomly around their long axis in both the A and C phases. Two different choices of the two-particle distribution function are use…