Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTheoretical study on the dimerization of silanone and the properties of the polymeric products (H2SiO)n (n = 2, 3, and 4). Comparison with dimers (H2SiS)2 and (H2CO)2Takako Kudo and Shigeru NagaseCite this: J. Am. Chem. Soc. 1985, 107, 9, 2589–2595Publication Date (Print):Ma…
Numerous copolymerizations of glycolide with β-propiolactone, γ-butyrolactone, δ-valerolactone and ϵ-caprolactone were conducted either in bulk or in nitrobenzene solution at temperatures in the range of 20–150°C. Three classes of catalysts were used, namely acidic catalysts initiating cationic polymerizations, comple…
Abstract A mathematical model is developed to describe the process of thermal regeneration in diesel‐particulate monolithic filters. The model shows that a typical regeneration cycle consists of four stages: preheating, ignition, transport‐controlled combustion, and cooling. The total regeneration time and the peak te…
The anisotropy of fracture toughness of PZT‐ and barium titanate‐based piezoelectric ceramics was studied using doubletorsion and indentation methods. The influence of elastic anisotropy and the piezoelectric effect in calculating the K c value are discussed. The fracture toughness in the polarization plane is greater…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolymorphic transformations in ferroelectric copolymers of vinylidene fluoride induced by electron irradiationAndrew J. LovingerCite this: Macromolecules 1985, 18, 5, 910–918Publication Date (Print):May 1, 1985Publication History Published online1 May 2002Published inissue 1…
We have recently discussed how the Parrinello–Rahman theory can be brought into accord with the theory of the elastic and thermodynamic behavior of anisotropic media. This involves the isoenthalpic–isotension ensemble of statistical mechanics. Nosé has developed a canonical ensemble form of molecular dynamics. We comb…
We report the detection of nascent CN(X 2Σ+, v″=0) following the 266 nm photodissociation of 300 K ICN, using sub-Doppler resolution laser-induced fluorescence, and polarized photolysis and probe lasers. When monitoring a particular CN internal state, the translational energies of the I+CN and I*+CN channels differ by…
Residual stresses that develop during cooling of a metal/ ceramic strip are calculated analytically. It is shown that the metal may behave elastically or plastically (with full or partial plasticity) depending on the mechanical properties, the thickness of the two constituents, and the mismatch in thermal expansion. R…
A combination of surface spectroscopy and microanalytical techniques have been used to investigate the chemical and material characteristics of interfaces formed between metal and a high temperature polymer, polyimide. Results reveal significant chemical reactivity at the interface, as manifested by intermixing and cl…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal morphology engineering by "tailor-made" inhibitors; a new probe to fine intermolecular interactionsZiva Berkovitch-Yellin, J. Van Mil, L. Addadi, M. Idelson, M. Lahav, and L. LeiserowitzCite this: J. Am. Chem. Soc. 1985, 107, 11, 3111–3122Publication Date (Print):May…
The structure of rhodium in an ultradispersed 0.57 wt % Rh/y-Al,O, catalyst before and after CO adsorption was studied with extended X-ray absorption fine structure (EXAFS), X-ray photoelectron spectroscopy (XPS), electron spin resonance (ESR), temperature programmed reduction (TPR), CO infrared spectroscopy, and H2 a…
Abstract The matrix distortion influence on the noble gas atoms He and Ne introduced into diamond by ion implantation is discovered and explained. Consequences of the effect mentioned are the chemical activity of the noble gas atoms in diamond lattice and the formation of stable impurity‐defect complexes, as it follow…
Thermal and electric conductivities of polyethylene and poly(vinyl chloride) filled with carbon materials over a wide range are measured in order to study the effect of formed conductive particle chains on thermal conductivities of the composites. With increase of content of carbon particles, the amount of formed cond…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMagnetic properties and zero-field splitting in high-spin manganese(III) complexes. 1. Mononuclear and polynuclear Schiff-base chelatesBrendan J. Kennedy and Keith S. MurrayCite this: Inorg. Chem. 1985, 24, 10, 1552–1557Publication Date (Print):May 1, 1985Publication History…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA heteropolyanion with fivefold molecular symmetry that contains a nonlabile encapsulated sodium ion. The structure and chemistry of [NaP5W30O110]14-Mohammed H. Alizadeh, Subhash P. Harmalker, Yves Jeannin, Jeanne Martin-Frere, and Michael T. PopeCite this: J. Am. Chem. Soc.…
Abstract Amorphous silica phases (opal-A) precipitate in nature due to the formation of dense colloids in supersaturated alkaline aqueous solutions with low relative concentrations of other ions. Opal-A dissolves and yields solutions of still relatively high silica content. In pore waters containing abundant cations,…
A general approach to diffusion-limited crystal growth is proposed. It consists of a modified (nonequilibrium) Cahn-Hilliard representation of the interface coupled to a diffusion equation. Arguments are given as to its superiority over previous models. These are illlustrated in a one-dimensional solution which shows…
Abstract The diagenetic sequence of silica is examined in terms of several thermodynamic and kinetic concepts. The relationship between solubility and surface area or particle size is sufficient to explain simple opal-A --> opal-CT --> quartz transformations, suggesting that the role of temperature and o…
Mechanisms of failure in a unidirectional Sic‐fibe/glass‐ceramic composite are investigated using in situ observations during tensile and flexural loading. These experiments show that failure in tension occurs in several stages (similar to certain other brittle fiber composites): multiple matrix cracking, followed by…
The ultraviolet (UV)/ozone surface cleaning method is reviewed. The UV/ozone cleaning procedure is an effective method of removing a variety of contaminants from surfaces. It is a simple-to-use dry process which is inexpensive to set up and operate. It can rapidly produce clean surfaces, in air or in a vacuum system,…