Materials Literature
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The reactions leading to the formation of crystalline Mg 3 (OH) 5 Cl·4H 2 O (phase 5), Mg 2 (OH) 3 ,Cl·4H 2 O (phase 3), and Mg(OH) 2 are compared for the systems MgO‐MgCl 2 ‐H 2 O and NaOH‐MgCl 2 ‐H 2 O. The crystalline phases were determined by X‐ray diffraction analysis. The concentration of the total magnesium and…
Passive layers on nickel and their change by the action of fluoride have been studied by surface analyses such as x‐ray photoelectron spectroscopy (XPS) and low energy ion scattering (ISS). The thickness of the layers is deduced from the height of the XPS signals Ni 2 p 3 / 2 , O1s, and F1s and their attenuation by co…
Abstract Complex formation between halloysites, from soil and geological sources, and a series of amides has been investigated. All the amides used can be intercalated to give single-layer complexes with basal spacings between 10·4 Å (for formamide) and 12·4 Å (for N,N -dimethylacetamide). When the interlayer space of…
Electroactive and electrochromic films of electropolymerized polyazulene and polythiophene have been found to be surprisingly insensitive to common solvents and temperature. As electrodes in all‐organic batteries these thin polymeric films allow current densities of 2 mA/cm 2 at open‐circuit voltages of 2.3V. The elec…
Synthesis of complex metal oxides by the thermal decomposition of solid-solution precursors (formed by isomorphous compounds of component metals) has been investigated since the method enables mixing of cations on an atomic scale and drastically reduces diffusion distances to a few angstroms. Several interesting oxide…
Defauts et diffusion dans les sulfures: proprietes thermodynamiques des sulfures metalliques; structure des defauts des sulfures metalliques; proprietes de transport des sulfures. Sulfuration des metaux et des alliages: influence des processus secondaires sur le mecanisme et la cinetique de croissance des couches de s…
Grain size effects in polycrystalline BaTiO3 are reviewed in terms of the “internal stress model”. By considering polarization dependent terms in the Devonshire free energy expression, the dielectric constant may be calculated for the whole ferroelectric temperature region, under various stress systems. Encouraging co…
Abstract The surface plasmon absorption band of small metal particles or large clusters (diameter ≤ 100 Å) is known to shift and to broaden with decreasing diameter. It is argued and experimentally proven at Ag‐colloids that this size effect depends sensitively on the microscopic surface properties of the clusters, wh…
The application of synchrotron X-ray radiation to powder diffraction is described. A perfect Si double-crystal monochromator at the Cornell High Energy Synchrotron Source (CHESS) was used in conjunction with Si, Ge, LiF and Al2O3 analyzers to investigate resolution and intensity characteristics at selected wavelengths…
We studied the forms, properties, and significance of active Al and Fe in the humus horizons of Andosols from northeastern Japan and formed a hypothesis to elucidate the surface weathering of volcanic ash. Our soil samples were divided into two groups: nonallophanic and allophanic. Nonallophanic soils showed that Al o…
At temperature above 300°C the glycosyl units of cellulose are simultaneously depolymerized to a tar and decomposed to a char by evolution of H2O, CO, and CO2. When the glycosyl units are depleted, a stable char is formed containing about 30% aliphatic and 70% aromatic components. The aliphatic component is formed fir…
Water adsorption on clean and oxygen covered Pd(100) has been studied by electron energy loss spectroscopy and low energy electron diffraction. On the clean surface water is associatively adsorbed and reveals hydrogen bonding. Hydroxyl is produced upon water adsorption on oxygen precovered Pd(100). The hydroxyl molecu…
The preservation and contrast of membranous structures in cultured cells using various postfixation procedures prior to embedding have been investigated. These include routine OsO4, ferrocyanide-reduced OsO4, osmium-thiocarbohydrazide-osmium (OTO), and ferrocyanide-reduced osmium-thiocarbohydrazide-ferrocyanide-reduce…
Temperature - dependent thermopower-, dc- and microwave conductivity meaurements on the two-dimensional organic metal (BEDT-TTF)+ 2J- 3 are reported.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and properties of substituted (phthalocyaninato)-iron and -cobalt compounds and their pyridine adductsJosef Metz, Otto Schneider, and Michael HanackCite this: Inorg. Chem. 1984, 23, 8, 1065–1071Publication Date (Print):April 1, 1984Publication History Published onl…
The results of an investigation of a large group of diffuse phase transition ferroelectrics distinguished by a number of specific features that make them important for both research and application are reported. A mechanism for diffuse phase transition is proposed. The necessity of a theory for this class of disordere…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe interphase in lamellar semicrystalline polymersPaul J. Flory, Do Y. Yoon, and K. A. DillCite this: Macromolecules 1984, 17, 4, 862–868Publication Date (Print):April 1, 1984Publication History Published online1 May 2002Published inissue 1 April 1984https://pubs.acs.org/do…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPrediction of limiting activity coefficients by a modified separation of cohesive energy density model and UNIFACEugene R. Thomas and Charles A. EckertCite this: Ind. Eng. Chem. Process Des. Dev. 1984, 23, 2, 194–209Publication Date (Print):April 1, 1984Publication History P…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydroxylation by cytochrome P-450 and metalloporphyrin models. Evidence for allylic rearrangementJohn T. Groves and Durga V. AdhyamCite this: J. Am. Chem. Soc. 1984, 106, 7, 2177–2181Publication Date (Print):April 1, 1984Publication History Published online1 May 2002Publishe…
Among the various mesogenic polyaromatic cores, only benzene, triphenylene, truxene and anthraquinone hexasubstituted derivatives exhibit one or several D columnar phases and/or a ND lenticular nematic phase. A simple scheme of nomenclature is suggested for the six different types of columnar phase requiring only two…