Materials Literature
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We have observed crystal nucleation in a Lennard-Jones fluid by molecular dynamics. In a 108-particle system cooled slowly below its triple point, crystallization occurs at kT/ε=0.50 and 0.57 for densities Nσ3/V =0.90 and 0.91, respectively. For larger systems (256 and 500 particles) crystallization has also been achi…
Abstract Mathematical models are developed which account for simultaneous heat transfer, mass transfer, and chemical reaction in the oxidation of carbon monoxide over platinum containing monoliths. A two‐dimensional model is shown to predict unusual behavior of the Nusselt number in the presence of rapid reaction. How…
Tin (Sn4+) and zinc (Zn2+) derivatives of horse heart cytochrome c have been prepared and their optical spectra have been characterized. Zinc cytochrome c has visible absorption maxima at 549 and 585 nm and Soret absorption at 423 nm. Tin cytochrome c shows visible absorption maxima at 536 and 574 nm and Soret absorpt…
Results of proton dynamic nuclear polarization (DNP), nuclear spin-lattice relaxation, and ESR experiments in six YES: $^{168}\mathrm{Er}$ ($^{168}\mathrm{Er}$-doped yttrium ethyl sulphate) single crystals at 4.15 K and 9.1 GHz are reported here. This material approximates an inhomogeneously broadened (IHB) ESR line f…
A theory of strength loss for brittle surfaces in contact situations, developed in a previous paper for “blunt” indenters, is extended to the case of “sharp” indenters. A prior fracture mechanics analysis of crack growth beneath ideal cone indenters serves as the basis for predetermining the prospective surface degrad…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA proton nuclear magnetic resonance study of imidazole-iron bonding in low-spin ferric complexes with synthetic porphyrinsJames D. Satterlee and Gerd N. La MarCite this: J. Am. Chem. Soc. 1976, 98, 10, 2804–2808Publication Date (Print):May 1, 1976Publication History Publishe…
The results of Raman scattering and reflectivity measurements of XS2 (X=Fe, Co, Ni, Cu, Zn) transition metal dichalcogenides are reported. These compounds are expected to exhibit five Raman-active and five ir-active q?0 optical phonons in first-order processes. Measurements of light scattering at T?300 °K revealed at…
We discuss the possibility of achieving abnormally low electromagnetic scattering cross sections at low frequencies by adjusting the optical properties of the scatterers (e.g., concentric spheres), generalizing the work in an earlier communication. The discussion is based upon an expansion valid for any spherical scat…
The oscillating rheometer is a valuable instrument for studying the effects of additives on the setting behavior of a cement system. Using this instrument, it was found that certain chelating comonomers, the hydroxycarboxylic acids, could improve the setting characteristics of the glass-ionomer cement system when adde…
Unusual [$uuw$]- and [$uv0$]-type axes of easy magnetization have been observed in some cubic rare-earth-iron Laves compounds. The presence of these directions of spontaneous magnetization can be accounted for, within the phenomenological treatment of the magnetic anisotropy, by including eighth-power direction-cosine…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe structure of the heteropolytungstate (NH4)17NA|NaW21Sb9O86|.cntdot.14H2O. An inorganic cryptateJean Fischer, Louis Ricard, and Raymond WeissCite this: J. Am. Chem. Soc. 1976, 98, 10, 3050–3052Publication Date (Print):May 1, 1976Publication History Published online1 May 2…
Measurements of electrical and optical properties have been made on Ge x Se 1- x amorphous thin films of about 1 µm thickness. From the experiment of electrical conductivity at various temperatures, two processes of the d.c. conductivity in Ge x Se 1- x films are observed in plots of ln σ against 1/ T . The thermoelec…
A series of glasses in the TiO 2 ‐SiO 2 system was prepared by the flame hydrolysis boule process. Clear glasses containing as much as 16.5 wt% TiO 2 were obtained. More TiO 2 caused opacity due to phase separation and anatase/rutile crystallization during glass boule formation. Glasses in the 12 to ∼17 wt% TiO 2 rang…
Crack healing and strengthening of thermally shocked alumina are related to pore evolution in the microstructure during annealing. Grain growth is not necessary for either an increase or a decrease in strength following heat treatment.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDouble Strand Helix of Isotactic Poly(methyl methacrylateHiroshi Kusanagi, Hiroyuki Tadokoro, and Yozo ChataniCite this: Macromolecules 1976, 9, 3, 531–532Publication Date (Print):May 1, 1976Publication History Published online1 May 2002Published inissue 1 May 1976https://pu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolvent and substituent effects on the redox reactions of para-substituted tetraphenylporphyrinKarl M. Kadish and Mark M. MorrisonCite this: J. Am. Chem. Soc. 1976, 98, 11, 3326–3328Publication Date (Print):May 1, 1976Publication History Published online1 May 2002Published i…
The Eu 2+ luminescence in hexagonal aluminates containing large divalent or trivalent cations was studied in relation to the crystal structures of the host lattices. It was found that these can be divided into three groups: compounds with the magnetoplumbite structure like ; the La‐containing aluminates ( and ) which…
Abstract The thermal cis-to-trans isomerization rate of various azobenzenes was followed by means of spectrophotometric and flash photolysis techniques. For para-donor/para′-acceptor-substituted azobenzenes such as 4-nitro-4′-dimethylaminoazobenzene, the rate was distinctly accelerated, the activation energy decreasin…
Measurements of the saturation magnetization have been made on a series of Fe-Si alloys near ${\mathrm{Fe}}_{3}$Si and a series of alloys in which a small amount of a $3d$, $4d$, or $5d$ transition-metal element ($T$) is added to form the composition ${\mathrm{Fe}}_{3\ensuremath{-}c}{T}_{c}\mathrm{Si}$. Moment assignm…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTriple-decker sandwichesJoseph W. Lauher, Mihai Elian, Richard H. Summerville, and Roald HoffmannCite this: J. Am. Chem. Soc. 1976, 98, 11, 3219–3224Publication Date (Print):May 1, 1976Publication History Published online1 May 2002Published inissue 1 May 1976https://pubs.acs…