Materials Literature
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Abstract In this paper, scanning electron microscopy (SEM), differential scanning calorimetry (DSC) and wide‐angle X‐ray diffraction (WAXD) were used to study the structure and compatibilization of poly(propylene) (PP)/nylon‐12 (PA 12) blends. The compatibilization of maleated PP(PP‐MA) and graft copolymer (PP‐MA‐ g ‐…
The chemical and physical properties of AgelessR oxygen absorber, a commercial oxygen scavenger, are described. The active ingredient in Ageless is finely divided iron, but the key to its use as a practical method of removing oxygen is the method of preparation, additives and packaging. Criteria for museum use are put…
Deposition of silicon from chlorosilanes is studied. Based on a model for gas‐phase reactions involving , , , and , the reaction constants for relevant gas‐phase reactions are determined. Deposition is analyzed in two ways: one (effusive flux model) using the surface reaction probabilities of surface reactions, and th…
An optical band-gap shrinkage was found in highly transparent and conducting thin films deposited by the Pyrosol process. The narrowing appears at carrier concentrations which are consistent with a metal-semiconductor transition. The gap-shrinkage dependence on carrier concentration is consistent with the model propos…
Current studies on the fatigue lifetime of ceramics are mostly focused on the relation between the stress amplitude (or maximum Stress) and cycles to failure. For a more compliant and plastic ceramic which has a pronounced nonlinear stress–strain relation, the role of plastic strain in the fatigue damage is investigat…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAccurate Mixture-Model Densities for D2OMary Vedamuthu, Surjit Singh, and G. Wilse RobinsonCite this: J. Phys. Chem. 1994, 98, 34, 8591–8593Publication Date (Print):August 1, 1994Publication History Published online1 May 2002Published inissue 1 August 1994https://pubs.acs.or…
In Parts I and II, we reported that during nonsteady-state transport of water vapor through layered fabrics, the temperature between two fabrics rose. In this study, we measure the surface temperature of the first-layer fabrics in similar experiments. The mass of the first layer is changed by tightly stacking the same…
A high density polyethylene homopolymer was blended with a linear low density ethylene hexene copolymer over the composition range of 0–100%. The resistance to slow crack growth was measured by a notched tensile test under constant load at 42, 60 and 80°C. The morphology was varied by slow cooling, quenching and annea…
Abstract Crystallinities of films of copolymers of chlorotrifluoroethylene with 0 to 4% vinylidene fluoride, different molecular weights and thermal histories were calculated from differential scanning calorimetry (DSC), X‐ray diffraction (XRD), and density measurements. The crystallinities for these films range betwe…
A detailed electrochemical evaluation of Sn‐modified LaNi 5 was performed to evaluate its performance as a negative electrode in alkaline rechargeable cells. Substituting small amounts of Sn for Ni provides a large improvement in the initial capacity and cycle lifetime of the electrode, and also serves to improve the…
An experimental set-up designed for in situ Raman analysis during the growth of diamond films in a microwave plasma reactor is described. A gated multichannel detection synchronized with a pulsed YAG laser is used to discriminate the Raman signals from the plasma emission. The in situ detection of a diamond film durin…
Gallium is a metal that literally melts in your hand. It has low toxicity, near-zero vapor pressure, and a viscosity similar to water. Despite possessing a surface tension larger than any other liquid (near room temperature), gallium can form nonspherical ...Read More
ABSTRACT: Theoretical and experimental evidence for the occurrence of multiple relaxation regimes in polymers far above the glass transition temperature is presented and interpreted in terms of the Kohlrausch-Williams-Watts (KWW) stretched exponential expression. Intramolecular effects responsible for the observation…
Vibrational Raman spectroscopy was used successfully for the quantitative determination of the cubic and monoclinic phases of zirconia. Pressed pellets with known composition were prepared using monoclinic and cubic powders from different manufacturers and were used as standard mixtures. An intensity ratio plot of the…
Abstract High valent species formed from iron(III) meso-tetra-(pentafluorophenyl)porphyrin was first prepared in dichloromethane and characterized by low-temperature UV-vis absorption spectra, proton NMR and ESR. These measurements showed the formation of oxo iron(IV) porphyrin π-cation radical, not iron(V) porphyrin.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPyrophosphate Structures and Reactions: Evaluation of Electrostatic Effects on the Pyrophosphates with and without Alkali CationsBuyong Ma, Cynthia Meredith, and Henry F. Schaefer IIICite this: J. Phys. Chem. 1994, 98, 33, 8216–8223Publication Date (Print):August 1, 1994Publ…
We have investigated the crystal structures of 186 polar molecular organic compounds with the aim to consider the occurrence of ferroelectric state. There are 16 crystals suspected of ferroelectricity. The results of tentative experimental investigations are also included.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChain Core Isomerism in dppm-Bridged Polymetallic Complexes. Synthesis, Reactivity, and Structure of Fe-Hg-Pt, Fe-Sn-Pt, and Fe-Pd-Sn Arrays (dppm = Ph2PCH2PPh2)Pierre Braunstein, Michael Knorr, Martin Strampfer, Antonio Tiripicchio, and Franco UgozzoliCite this: Organometal…
The nucleation and growth of diamond films on Nicemented carbide is investigated. Substrates made of WC with 6 wt% of Ni were submitted to grinding, and then to different pretreatments (scratching, etching, and/or decarburization) before diamond deposition. Diamond synthesis was carried out by hot‐filament chemical va…
We are concerned with a family of minimization problems arising in Quantum Chemistry for the modelling of the ground state of a molecule. We study the multiconfiguration methods, which are an extension of the well known Hartree–Fock method. We propose a general approach to prove the existence of the ground state in th…