Materials Literature
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Fossil glycoproteins of the soluble organic matrix are present in an 80-million-year-old mollusk shell from the Late Cretaceous Period. Discrete molecular weight components, as determined by gel electrophoresis, are preserved. The fossil organic matrix was compared with the organic matrix of a living representative sp…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRaman studies of sulfur-containing anions in inorganic polysulfides. Potassium polysulfidesG. J. Janz, J. W. Coutts, J. R. Downey, and E. RodunerCite this: Inorg. Chem. 1976, 15, 8, 1755–1759Publication Date (Print):August 1, 1976Publication History Published online1 May 200…
We discuss some theoretical features of a nematic phase made of long, partially flexible chains. The bend constant K3 is dominated by the rigidity of the chains. The twist constant K2 is mainly related to the anisotropic couplings between chains. The splay constant is very large (increasing like the square of the mole…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStudy of metal oxide catalysts by temperature programmed desorption. 1. Chemisorption of oxygen on nickel oxideMasakazu Iwamoto, Yukihiro Yoda, Makoto Egashira, and Tetsuro SeiyamaCite this: J. Phys. Chem. 1976, 80, 18, 1989–1994Publication Date (Print):August 1, 1976Publica…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRaman studies of sulfur-containing anions in inorganic polysulfides. Barium trisulfideG. J. Janz, E. Roduner, J. W. Coutts, and J. R. DowneyCite this: Inorg. Chem. 1976, 15, 8, 1751–1754Publication Date (Print):August 1, 1976Publication History Published online1 May 2002Publ…
Conventional measurement techniques for the investigation of the behavior of corona-charged polymer foil electrets allow one to determine the equivalent surface charge and the surface potential decay after termination of the charging process. This paper describes a technique which determines charges, currents, and pot…
The thermal decomposition of low-density polyethylene, isotactic polypropylene, and polyisobutylene has been studied in helium at a heating rate of 20°C/min using an experimental system which consists of a programmable pyrolyzer, a thermal conductivity cell, and a mass chromatograph. For low-density polyethylene, the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRaman studies of sulfur-containing anions in inorganic polysulfides. Sodium polysulfidesG. J. Janz, J. R. Downey, E. Roduner, G. J. Wasilczyk, J. W. Coutts, and A. EluardCite this: Inorg. Chem. 1976, 15, 8, 1759–1763Publication Date (Print):August 1, 1976Publication History…
Effects of strain rate, applied potential, pH, temperature, and hydrogen sulfide concentration on sulfide cracking of mild steel were examined at constant strain rates by means of an Instron-type machine. Fractographic observations were also carried out on a scanning electron microscope. Kinetic studies were also made…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTVariable spin iron(III) chelates with hexadentate ligands derived from triethylenetetramine and various salicylaldehydes. Synthesis, characterization, and solution state studies of a new 2T .dblarw. 6A spin equilibrium systemMichael F. Tweedle and Lon J. WilsonCite this: J.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfrared studies of reactions on oxide surfaces. 6. Active sites on dehydroxylated silica for the chemisorption of ammonia and waterB. A. Morrow and I. A. CodyCite this: J. Phys. Chem. 1976, 80, 18, 1998–2004Publication Date (Print):August 1, 1976Publication History Publishe…
An apparatus for determining the specific volume of solid and liquid polymers as a function of pressure (to 2200 kg/cm2) and temperature (30–350 °C) has been constructed. It is based on Bridgman’s bellows method and makes use of a linear variable differential transformer (LVDT) mounted outside the pressure vessel to m…
Abstract Solvent‐cast films of blends of poly(ϵ‐caprolactone) (PCL) with poly(vinyl chloride) (PVC) were examined by low‐angle x‐ray scattering and by small‐angle light scattering. X‐ray scattering from crystalline compositions were analyzed using the Tsvankin–Buchanan technique and led to values of the repeat period…
Abstract Order‐disorder phenomena in binary oxides with fluorite‐related structures were studied by Raman spectroscopy. Raman spectra of disordered phases show broad bands, defects leading to selection rule breakdown. For well‐ordered structures, the scattering active modes observed are those allowed by crystal symmet…
Stresses in aluminum thin films on TiN were studied in situ by transmission x-ray topography. Stress gradients were seen to build up in thin aluminum films during passage of electrical currents. The stresses are more compressive in the anode regions. These stress gradients seem to be a concomitant of the backflow resp…
Abstract High molecular weight copolyesters were prepared by the acidolysis of poly(ethylene terephthalate) with p ‐acetoxybenzoic acid and polycondensation through the acetate and carboxyl groups. The mechanical properties of the injection‐molded copolyesters containing 40–90 mole‐% p ‐hydroxybenzoic acid (PHB) were…
Using a capillary technique for small samples, the isothermal compressibility κT of water has been measured to −26°C. Accelerating increases of κT at the lower temperatures can be described by an expression of the form κT=Aεγ [where ε= (T−Ts)/Ts], which is known to describe anomalies encountered in the vicinity of a t…
Magnetic heat pumping can be made practical at room temperature by using a ferromagnetic material with a Curie point in or near the operating temperature range and an appropriate regenerative thermodynamic cycle. Rare earths are found to be much more effective in this application than transition elements, and measurem…
This review treats the little-studied magnetic phase transitions of the order-order, spin-reorientation type, in which a rotation of the magnetization vector (or of die antiferromagnetism vector) with respect to the crystallographic axes occurs upon change of temperature, magnetic field, or external pressure. It prese…
A self-consistent formula, which corrects a persistent mistake in the literature, has been developed for the optical joint density-of-states (OJDS) function. A way of linking valence- and conduction-bands densities of states to produce an average density or optically linked states function (ADOLS) for comparison with…