Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHeteropolyvanadates containing two and three manganese(IV) ions: unusual structural features of Mn2V22O6410- and Mn3V12O40H35-Hikaru Ichida, Kenji Nagai, Yukiyoshi Sasaki, and Michael T. PopeCite this: J. Am. Chem. Soc. 1989, 111, 2, 586–591Publication Date (Print):January 1…
Studies of a wide range of intramolecularly five-co-ordinated silicon compounds with chelating nitrogen donors have been made, with a view to obtaining further information on the details of nucleophilic substitution reactions at silicon. The crystal structure of 2-(dimethylaminomethyl)-phenyl-1 -naphthylsilane has bee…
Thin films of polyimide were prepared by spin coating the poly(amide–acid) precursor onto copper and aluminum substrates, followed by the usual heat treatment to promote imidization (curing) of the film. Films prepared on aluminum substrates were completely cured during the heat treatment, as shown by x-ray photoelect…
Measurements of the effect of heat treatment following cold work on the yield and shape memory behaviour in a NiTi alloy are reported. Tensile behaviour is found to depend on test temperature and initial structure as well as annealing temperature. Minimum values of stress required for stress induced martensite, marten…
Results from particle squashing tests designed to simulate the process of rolled in lubricant debris in rolling element bearings, are presented and showed to compare well with an earlier published theory. Measurements of the harder anvils after squashing various hard particles confirm our earlier theoretical results,…
As the wettability of solid oxides by liquid metals gives important information on the development of composite materials, metal- ceramics joinings, and the behaviour of deoxidation products in liquid metal, a large number of papers have been published. However, there are large discrepancies among the values reported.…
Monomeric and dimeric species of phthalocyanines with four, 15-crown-5-ether (1,4,7,10,13-pentaoxacyclopentadecane) voids at the 2,3 positions (ML)(where M = H2, Cu, Zn, Ni, or Co), have been studied using optical absorption and magnetic circular dichroism (m.c.d.) spectroscopies. The ready solubility of these crown e…
The concept of grain-oriented fabrication in ceramics, which utilizes anisotropy either in morphology or some specific property of the particle, is reviewed. A fabrication method, which maximizes the grain orientation, is described for Bi(4)Ti(3)O(12 ). The process utilized plate-like morphology of Bi(4)Ti (3)O(12) pa…
Two broad categories of austenitic steels are considered in this review: (a) alloys based on the Fe–Mn–C system, typified by austenitic wear resistant (Hadfield) steels and (b) alloys based on the Fe–Mn–Cr system, typified by austenitic corrosion resistant steels. Advances made in recent years in understanding and imp…
A new range of electron donor–spacer–acceptor systems has been assembled using co-ordination chemistry to link the subunits; rates of photo-induced electron transfer to the same acceptor ligand imply that tetraphenylporphyrins and octa-alkyl porphyrins have different solvent reorganisation energies.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAliphatic versus aromatic carbon-hydrogen activation and the x-ray crystal structure of [IrH(H2O)(7,8-benzoquinolinato)(PPh3)2]SbF6Maryellen Lavin, Elizabeth M. Holt, and Robert H. CrabtreeCite this: Organometallics 1989, 8, 1, 99–104Publication Date (Print):January 1, 1989P…
The excited-state dynamics of the Tm3+ ions in a singly doped crystal of LiYF4 is analysed. The Stokes fluorescence processes are interpreted by taking into account the numerous coincidences between the fluorescences emitted by the Tm3+ ions and by considering two kinds of sites. The anti-Stokes fluorescence dynamics…
Description Advances in Thermoplastic Matrix Composites Materials Provides an overview of recent accomplishments in advanced aerospace thermoplastic composites. 18 pages cover these important issues: • Processing • Thermal and Mechanical Behavior • Delamination
From the crystallographical point of view, phyllotaxis can be identified with the study of spiral lattices. In this paper, we devote our attention to plane lattices of points. Through a conformal transformation, one gets a lattice of points aligned along a logarithmic spiral. Centuries ago, one recognized the central…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDiffusion of various dialkyl phthalate plasticizers in PVCRobson F. Storey, Kenneth A. Mauritz, and B. Dwain CoxCite this: Macromolecules 1989, 22, 1, 289–294Publication Date (Print):January 1, 1989Publication History Published online1 May 2002Published inissue 1 January 198…
Polyhydroxybutyrate (PHB) can be used as an alternative polymer to polylactide-glycolides for drug carrier production. It is a linear homopolymer biosynthesized by various strains of bacteria by condensation of D(-)-B-hydroxybutyric acid and used as an energy and carbon source. PHB can be obtained by extraction from b…
Nd-Fe-B alloys can be rapidly solidified to produce a highly stable, magnetically isotropic powder which can be processed directly into either bonded magnets or, if not pressed, into anisotropic magnets with energy levels exceeding 40 MGOe. Current processing methods are briefly reviewed, as are some of the unique adv…
The effect of lateral fluorine substituents on the dielectric properties of a range of nematic liquid crystals is reported. Measurements of dipole moments and electric permittivities have been made and used to calculate Kirkwood correlation factors over a range of temperature. The results show that the extent and natu…
It has been tried to design and prepare SiC/C Functionally Gradient Material (FGM) accompanying compositional gradient from SiC to C, for developing thermal-barrier materials for space plane. Thermal stresses in SiC monolith and SiC/C⋅FGM were calculated, based on one-dimensional linear analysis for a cylindrical mode…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOxygen atom transfer chemistry of heteropolytungstate 'browns' in nonaqueous solventsKent Piepgrass and Michael T. PopeCite this: J. Am. Chem. Soc. 1989, 111, 2, 753–754Publication Date (Print):January 1, 1989Publication History Published online1 May 2002Published inissue 1…