Materials Literature
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The dynamic critical exponents of classical liquids are studied on the basis of the mode coupling theory. The shear viscosity for the spatial dimensionality between two and four exhibits the weak power law divergence at a critical point, which was briefly reported in a previous paper. The non-Markoffian effects and th…
An anisotropic three-dimensional random walk model is developed and used to describe the frequency dependence of proton spin–lattice relaxation rates in several TCNQ salts. The triplet exciton system (φ3AsCH3) (TCNQ)2 at 145 °K is shown to display two-dimensional diffusive behavior. Measurements of the proton relaxati…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemistry of the macrocyclic cobalt(II) complex, [Co(C22H22N4)]. Reactions with halogens, molecular oxygen, alkynes, and nitrilesMarvin C. Weiss and Virgil L. GoedkenCite this: J. Am. Chem. Soc. 1976, 98, 11, 3389–3392Publication Date (Print):May 1, 1976Publication History P…
Abstract When benzene or phenol are adsorbed on smectite containing Fe(III) or Cu(II) on the exchange complex, higher molecular weight products are formed. Evidence for these products is provided by mass spectroscopy. In the case of benzene most of the reaction products cannot be attributed to coupled benzene rings, w…
The first series of ferrocene derivatives exhibiting mesomorphic properties (substituted N-(p-benzoyloxybenzylidene) anilines la and 1b) has been synthesized for application in Mössbauer spectroscopy.
The capacitance-voltage ( C - V ) and forward biased current-voltage ( I - V ) characteristics, electroluminescence (E.L) and photovoltaic effect of GaSe–SnO 2 heterojunction diodes are measured. SnO 2 layer is deposited on the c -plane of GaSe by using the spray method. The C - V and I - V characteristics of these di…
High-temperature spin dynamics in the one-dimensional (1d) Heisenberg system ${(\mathrm{C}{\mathrm{H}}_{3})}_{4}$NMn${\mathrm{Cl}}_{3}$ (TMMC), is investigated through EPR and proton spin relaxation-time measurements. When the magnetic field $\stackrel{\ensuremath{\rightarrow}}{\mathrm{H}}$ is parallel to the chain ax…
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…