Materials Literature
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A new liquid crystal field effect electro-optic device is described. Light transmission induced by voltage pulses across two electrodes is modulated or gated by voltage on a third electrode. The three-terminal gating characteristics are applicable to scanning and multiplexing arrays of devices for displays or light va…
Abstract Dissimilar fabrics, observed by scan electron micrography (SEM) on freshly broken surfaces of kaolins from weathered, water-laid material vs hydrothermally altered material in Mexico are illustrated, contrasted, and tentatively related to their respective environments of genesis. Coarse, open-textured, well-p…
Optical constants of β-rhombohedral and amorphous boron were obtained by ellipsometry and by the measurements of transmissivity and reflectivity. The values of the refractive index were found between 3.00 and 3.35 for wavelengths between 0.35 µm and 1.20 µm. Absorption coefficient α of amorphous boron as a function of…
Potentiodynamic polarization curves were obtained in and in for 13 and 18% Cr ferritic stainless steels containing 0–5% Mo. The critical current density for passivation was decreased by molybdenum additions in both acids, the decrease being more pronounced for the 18% Cr steels than for the 13% Cr steels. No complete…
Abstract The standard Gibbs energy of formation of \barCFeO3(\barC=La, Nd, Sm, Eu, Gd, Tb, and Dy) from metallic iron, \barC2O3, and oxygen has been determined at temperatures from 1473 to 1673 K. Based on the free-energy data, the heat of reaction and the entropy change resulting from the reaction have been calculate…
Abstract By a study of two ternary systems, 4‐heptanon–1‐chlorobutane–poly(methyl methacrylate) and 2‐butanol–1‐chlorobutane–poly(methyl methacrylate), differing only in one component of the mixed solvent, two types of demixing behavior are demonstrated: i.e., a monotone change with composition of the mixed solvent (m…
Normally one expects that flame contact is the major cause of injury and death during fires. Analysis of the factors involved in numerous fires has revealed that most deaths were not due to flame contact, but were a consequence of the production of carbon monoxide, nitrogen oxides, and other combustion products, such…
Abstract ESR spectra have been observed from several polymers (polyethylene, polypropylene, polymethylmethacrylate, polytetrafluoroethylene, and polybutadiene) which were mechanically fractured in vacuum at 77°K. The spectra permit identification of the free radicals produced in chain scission. It has been demonstrate…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSurface-supported metal cluster carbonyls. I. Decarbonylation and aggregation reactions of rhodium clusters on aluminaGary C. Smith, Thomas P. Chojnacki, Sipra R. Dasgupta, Kenneth. Iwatate, and Kenneth L. WattersCite this: Inorg. Chem. 1975, 14, 6, 1419–1421Publication Date…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfrared spectra and normal-coordinate analysis of 1,2-dithiolate complexes with nickelC. W. Schlaepfer and K. NakamotoCite this: Inorg. Chem. 1975, 14, 6, 1338–1344Publication Date (Print):June 1, 1975Publication History Published online1 May 2002Published inissue 1 June 19…
The layered compounds 2H-NbSe2, 4Hb-TaS2, and 1T-TaS2 have been intercalated with organic molecules; and the resulting crystal structure, heat capacity, conductivity, and superconductivity have been studied. The coordination in the disulfide layers was found to be unchanged in the product phase. Resistance minima appe…
Pure aluminum isopropoxide was shown to be a highly active catalyst for the polymerization of ε-caprolactone: the overall kinetics of this polymerization follow a first current order in monomer and a first order in catalyst. Mechanistical studies indicate also that this system operates through a selective acyloxygen c…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRotation of phenyl rings in metal complexes of substituted tetraphenylporphyrinsS. S. Eaton and G. R. EatonCite this: J. Am. Chem. Soc. 1975, 97, 13, 3660–3666Publication Date (Print):June 1, 1975Publication History Published online1 May 2002Published inissue 1 June 1975http…
Some of the areas where interfacial protein layers dominate the boundary chemistry are reviewed, and we introduce some nondestructive analytical methods which can be used simultaneously and/or sequentially to detect and characterize the microscopic amounts of matter at protein or other substrates which spontaneously a…
Introduction A method for obtaining interfacial and surface tensions by measuring the shape of a drop of liquid or bubble of gas in a more dense liquid contained in a rotating horizontal tube was first suggested by Plateau's ( 1 ) experiments. Beer ( 2 ) in 1855 considered the problem of the shape of the drop in some…
Abstract The reflection spectra of CaWO 4 and CaMoO 4 single crystals were measured in the region between 4 and 25 eV. The measurements were performed using the electron synchrotron DESY as a light source. Both crystals show very similar spectral features. A relatively sharp, well separated low energy peak is accompan…
Abstract Adsorption isotherms for water vapor, c -spacing and heat of immersion in water of Na- and Ca-montmorillonite were measured at 25°C at various r.h. The amount of water adsorbed as a function of the r.h. increased gradually, whereas the c -spacing increased, and the heat of immersion (per mole of adsorbed wate…
A set of equations has been derived to describe the dynamical motions of small cavitation bubbles in liquids set into motion by an acoustic pressure field. The mathematical formulation takes into account heat conduction inside a bubble and in the surrounding liquid, and the viscosity, compressibility, and surface tens…
1 The effects of adenosine triphosphate (ATP) and adenosine diphosphate (ADP) were investigated on evoked end-plate potentials (e.p.ps) and on miniature end-plate potentials (min. e.p.ps) recorded from muscle fibres of the rat diaphragm and the frog sartorius.2 ATP and ADP decreased the quantum content of the e.p.ps a…
Mechanisms of liquid-liquid phase separation were studied in the binary styrene-acrylonitrile copolymer/poly(methyl methacrylate) system. Evidence is presented which suggests that spinodal decomposition occurs in this system. The Cahn theory provides an interpretation of key experimental results. Both a dispersed, two…