Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolymerization of monomers containing functional silyl groups. 11. Anionic living polymerization of 3-(tri-2-propoxysilyl)propyl methacrylateHiroyuki Ozaki, Akira Hirao, and Seiichi NakahamaCite this: Macromolecules 1992, 25, 5, 1391–1395Publication Date (Print):March 1, 199…
Thermal oxidation characteristics of chemical vapor deposited (CVD) diamond films prepared by the hot filament method along with (111) and (100) oriented type II a natural diamond wafers were investigated in flowing oxygen at atmospheric pressure and in the temperature range 973–1173 K by thermogravimetry. Partially o…
Mg K-alpha X-ray photoelectron spectroscopy (XPS) was used to establish the relative concentration and the chemical state of aluminum at the surface of dealuminated mordenites. A method for the binding energy calibration is proposed. Modified Auger parameters of Al have been determined for different zeolites and clay…
Memory effects and PTF (phase transition with a field) effects are investigated in PDLC (polymer dispersed liquid crystal) films which show different three kinds of morphology. Highly transparent on states and memory states are obtained by PTF operation. The PTF effect is marked in PDLC films with complicated polymer…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNitrogen-15 and oxygen-17 NMR spectroscopy of silicates and nitrogen ceramicsRobin K. Harris, Matthew J. Leach, and Derek P. ThompsonCite this: Chem. Mater. 1992, 4, 2, 260–267Publication Date (Print):March 1, 1992Publication History Published online1 May 2002Published iniss…
The chemistry of methyl iodide on Ni(100) surfaces has been studied by using x-ray photoelectron spectroscopy (XPS). Methyl iodide adsorption is molecular below 100 K, but the C–I bond begins to cleave around 120 K and is completely broken by 160 K. The activation energy for the C–I bond scission was estimated to be a…
Butyl- cyclohexyl- and phenyltin compounds were extracted from enzymically-hydrolysed wine and beer samples with 0.05% tropolone in pentane. Methyl derivatives were made by Grignard reaction for determination by gas chromatography-atomic absorption spectrometry. Wine and beer samples contained less than 0.1 to 160 nl/…
Abstract Experimental responses from crystallization of copper sulfate pentahydrate, nickel ammonium sulfate, and soy protein in continuous MSMPR crystallizers were used to determine simultaneously crystal growth and nucleation rates and agglomeration kernels. Measured product crystal size distributions at steady stat…
The possibility of measuring the ‘true’ grain boundary (gb) diffusion coefficient in the so-called C kinetic regime is demonstrated for self-diffusion of silver. Although the criteria for the C-type diffusion have sometimes been experimentally established, we point out the existence of a transitional region in which t…
The wetting characteristics of copper surfaces, with and without an exposure to benzotriazole and benzotriazole derivatives, have been investigated by dynamic contact angle measurements. The results were compared to corrosion rates measured on the same samples by electrochemical techniques. The experiments show that t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe strain energy of cyclotetradecane is smallJames S. Chickos, Donald G. Hesse, Sandra Y. Panshin, Donald W. Rogers, Martin Saunders, Philip M. Uffer, and Joel F. LiebmanCite this: J. Org. Chem. 1992, 57, 6, 1897–1899Publication Date (Print):March 1, 1992Publication History…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTQuantitative theory of the globule-to-coil transition. 3. Globule-globule interaction and polymer solution binodal and spinodal curves in the globular rangeA. Yu. Grosberg and D. V. KuznetsovCite this: Macromolecules 1992, 25, 7, 1991–1995Publication Date (Print):March 1, 19…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNew triad alkylation reagent. Cross coupling of indium trialkyls with alkenyl halidesRyoki Nomura, Shinichiro Miyazaki, and Haruo MatsudaCite this: J. Am. Chem. Soc. 1992, 114, 7, 2738–2740Publication Date (Print):March 1, 1992Publication History Published online1 May 2002Pu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDetermination of the ground state of manganese phthalocyanine in an argon matrix using magnetic circular dichroism and absorption spectroscopyBryce E. Williamson, Thomas C. VanCott, Michael E. Boyle, G. Christian Misener, Martin J. Stillman, and Paul N. SchatzCite this: J. A…
Abstract Magnesium hydroxide and magnesium carbonates have attracted attention as endothermic flame retardants that are sufficiently stable to be incorporated into thermoplastics without decomposition. In this survey, a basic form of magnesium carbonate, magnesium carbonate hydroxide pentahydrate [(MgCO 3 ) 4 · Mg(OH)…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTQuantitative theory of the globule-to-coil transition. 2. Density-density correlation in a globule and the hydrodynamic radius of a macromoleculeA. Yu. Grosberg and D. V. KuznetsovCite this: Macromolecules 1992, 25, 7, 1980–1990Publication Date (Print):March 1, 1992Publicati…
C and SiO 2 of different types were mixed and heat‐treated (1410° to 1550°C), according to a standardized temperature program, in flowing N 2 at different pressures. It was found that a starting material combination of C (115 m 2 /g) and SiO 2 (50 m 2 /g) yielded pure Si 3 N 4 after about 2 h at 1550°C and 1.3 MPa. By…
To investigate the effect of reoxidation on the grain‐boundary acceptor‐state density of reduced barium titanate, n ‐doped BaTiO 3 ceramics are sintered in a reducing atmosphere (2% H 2 + 98% N 2 ) and then annealed in oxygen. After annealing at 1150°C for different times, the experimental results show a relationship…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolution thermodynamics of the ferric complexes of new desferrioxamine siderophores obtained by directed fermentationSilvia Konetschny-Rapp, Guenther Jung, Kenneth N. Raymond, Johannes Meiwes, and Hans ZaehnerCite this: J. Am. Chem. Soc. 1992, 114, 6, 2224–2230Publication Da…
ABSTRACT Molecular dynamic simulations of the thermal degradation of polyethylene were used to identify factors which might be effective in reducing polymer flammability by promoting the formation of a residual char. Computer movies of the calculated trajectories indicate that cross-linked polymers, such as those obta…