Materials Literature
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The chemical amplification concept proposed in 1982 to support high resolution short wavelength lithographic technologies that demand highly sensitive advanced resist systems is based on acid-catalyzed crosslinking, deprotection, and depolymerization reactions. Each approach has shown a tremendous progress. In this pa…
Abstract Dry synthetic polycrystalline salt (NaCl) has been deformed in uniaxial compression and in shear in order to gain insight into the influence of deformation mode on the development of crystallographic preferred orientation, microstructural evolution and mechanical behaviour (flow strength). The experiments wer…
A range of materials including sintered low and high coercivity ternary (NdFeB) and quarternary (NdFeBCo) magnet alloys and bonded Magnequench (MQI) was investigated. The effects of temperature including irreversible and reversible changes of magnetization are discussed. Magnets with two different working points were…
The machining performance of monolithic and composite silicon nitride and Al2O3-based cutting tools in continuous turning of Inconel 718 was examined. The character of tool wear has been found to vary, depending on the feed rate and cutting speeds. At a lower cutting speed, of 120 m/min, tool life is restricted by dep…
A previously undetected Bacillus subtilis aspartokinase isozyme, which we have called aspartokinase III, has been characterized. The new isozyme was most readily detected in extracts of cells grown with lysine, which repressed aspartokinase II and induced aspartokinase III, or in extracts of strain VS11, a mutant lack…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhase separation dynamics of rubber/epoxy mixturesHak Soo Lee and Thein KyuCite this: Macromolecules 1990, 23, 2, 459–464Publication Date (Print):January 1, 1990Publication History Published online1 May 2002Published inissue 1 January 1990https://pubs.acs.org/doi/10.1021/ma0…
Velocity selection in two-dimensional dendritic growth caused by anisotropy of the surface energy is considered. In the limit of low anisotropy the integro-differential equation for the velocity spectrum is reduced to a differential equation. The solution of this equation, corresponding to the maximal velocity, is sta…
Paramagnetic point defects sensitive to the surrounding atmosphere were observed in ZnO powder. Changes in EPR lines following either thermal-vacuum treatment or contact with molecular O2 led to definite conclusions regarding the nature of the ZnO point defects and the electron-transfer processes active at the ZnO/O2…
We report the first systematic measurements of elastic coefficients and viscosities that clearly demonstrate the distinction between rigid and semiflexible behaviour of a main-chain polymer nematic liquid crystal, a solution of poly-γ-benzyl glutamate (PBG) in mixed organic solvents. Quasi-elastic Rayleigh scattering…
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The static and dynamic magnetomechanical properties of Terfenol have been measured over the temperature range -21 degrees C to +70 degrees C as a function of bias field. The ratio of the change in magnetostriction to the change in magnetization is used to investigate the magnetization process. It is concluded that the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGas-phase chemistry of the silaformyl anion, HSiO-Scott Gronert, Richard A. J. O'Hair, Stephen Prodnuk, Detlev Suelzle, Robert Damrauer, and Charles H. DePuyCite this: J. Am. Chem. Soc. 1990, 112, 3, 997–1003Publication Date (Print):January 1, 1990Publication History Publish…
The basic discharge mechanisms pertinent to ion plating process are reviewed and some recent findings are highlighted, relating in particular to thermionically enhanced ion plating with an evaporative vapor source. By enhancing the discharge, the cathode sheath can approach collisionless conditions, which allows most…
RuII–SnII cluster complexes [Ru(SnCl3)5L]3–(L = MeCN, PPh3) have been found to be effective for the catalytic conversion of methanol to methyl acetate in a single step.
Synthesis of 3-alkyl selenophenes via chloromethyl ketones and acetylenic chlorhydrins is described. The electropolymerisation yields electroactive and soluble polymers with high conductivity in the doped state.
Conference Overview and the Role of Chemistry in High-Temperature Materials Science and Technology LEO BREWER Department of ChemistIy, University of California, and Materials and Chemical Sciences Div
Abstract Plasma polymer hexamethyldisiloxane, ethyldichlorophosphate and tris(butoxyethyl)phosphate modified polyacrylonitrile fibers were examined by FTIR, XRF, and SEM and the extend of flame retardancy introduced were checked. Certain levels of concentrations of flame‐retardant elements grafted or coated at the fib…
The commensurate and incommensurate structural configurations underlying the diffuse scattering from athermal {omega} found in the as-quenched {beta} phase of Ti with 8 and 15 at. % Mo have been investigated by high-resolution electron microscopy. Image interperetations were based on a simulation code developed via ob…
Measurement of dose or dose perturbation factors at high atomic number interfaces are usually performed with a thin-window parallel-plate ion chamber. In a transition region, under nonequilibrium conditions, accuracy of ion chamber readings for the dose measurements has often been questioned. This paper critically ana…
Polypropylene films were tested for lifetimes under high electric fields, using both constant and step-stress methods. Various time intervals for the step-stress test and voltages for the constant stress test were selected. The inverse power law was used in the analysis of the experimental data, with the value of the…