Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolymer diffusion in melt blends of low and high molecular weightStanley F. Tead and Edward J. KramerCite this: Macromolecules 1988, 21, 5, 1513–1517Publication Date (Print):May 1, 1988Publication History Published online1 May 2002Published inissue 1 May 1988https://doi.org/…
20Cr–25Ni–Nb stabilised stainless steel is used in the advanced gas cooled reactors (AGR) as cladding for the UO2 fuel. Extensive studies have been made and are continuing in an attempt to understand the spallation of surface oxide from this steel and in this paper recent progress is surveyed. In particular, it is sho…
SUMMARY A simple heat transfer model is presented to show that convection from the cryogen to the specimen is the limiting step in rapid freezing of small samples for electron microscopy when the Biot modulus, which measures the ratio of convective to conductive heat transfer, ( hd / k ) < 1. In comparison to the c…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTModels for strong interactions in proteins and enzymes. 2. Interactions of ions with the peptide link and with imidazoleMichael. MautnerCite this: J. Am. Chem. Soc. 1988, 110, 10, 3075–3080Publication Date (Print):May 1, 1988Publication History Published online1 May 2002Publ…
An experimental procedure is proposed to enable analysis of H2 emission/consumption data obtained during temperature-programmed reduction (TPR) of a metal-supported catalyst. Using the methods described allows one to account for chemical processes other than reduction and thus remove their contribution from the TPR pr…
Abstract Neat poly(ether‐ether‐ketone) (PEEK) and carbon fiber reinforced PEEK (APC‐2) specimens were prepared using a variety of cooling rates to achieve a range of crystallinities. Amorphous specimens were exposed to a variety of fluids to determine the penetrant types which are able to strongly influence the materi…
Partial photoionization cross sections and angular-distribution asymmetry parameters have been determined for the Xe 4d and ``4p'' subshells in the photon-energy region of the 4d Cooper minimum (160 eV to 270 eV, to 520 eV for the 4d asymmetry parameter). The Cooper minimum is observed as a distinct cross-section mini…
The effect of nitrogen, which is one of the most important elements in duplex stainless steels (SSs), was investigated for resistance to pitting corrosion and stress corrosion cracking (SCC) in various environments. The increase in nitrogen content increases the resistance of the base metal, which results from the imp…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPoly([1.1.1]propellane). A novel rigid-rod polymer obtained by ring-opening polymerization breaking a carbon-carbon .sigma.-bondArnulf Dieter SchlueterCite this: Macromolecules 1988, 21, 5, 1208–1211Publication Date (Print):May 1, 1988Publication History Published online1 Ma…
Abstract Dynamic or quasi‐elastic light scattering (LS) from polymers in solution arises from concentration fluctuations. With the aid of modern photomultipliers these can be followed as a function of time. A proper evaluation allows to study the center of mass motion and the dynamics of individual chains. The relevan…
The Gram-Charlier temperature factor formalism has been applied to a set of accurate low-temperature data on bis(pyridine)(meso-tetraphenylporphinato)iron(II), and to a theoretical set of static structure factors on the hexaaquairon(II) ion. The refinements are compared with the multipole treatment for atomic aspheric…
Glasses have been formed in the binary system PbO–Ga 2 O 3 within the compositional range extending from 60 to 80 mol% PbO. These glasses exhibit infrared cutoff values near 7.75 μm. The glasses are orange‐red as a result of a cutoff in visible transmission near 500 nm. The glass transformation temperature decreases w…
Anion polarizations have been introduced in a molecular dynamics simulation of a complexing ionic liquid MAX4 similar to tetrachloroaluminates. The influence of the polarizability on the structure of the melt has been deduced from the radial distribution functions, the numbers of nearest and next nearest neighbor pair…
α‐Al 2 O 3 ‐seeded, boehmite‐derived γ‐Al 2 O 3 was transformed in the presence of V 2 O 5 , resulting in a 205°C decrease in the α‐Al 2 O 3 transformation temperature and a 74% reduction in the apparent activation energy for the γ‐ to α‐Al 2 O 3 transformation at temperatures greater than 850°C. These changes are att…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLocal and cooperative Jahn-Teller distortions of nickel(2+) and copper (2+) in tetrahedral coordinationDirk Reinen, M. Atanasov, G. Nikolov, and Friedhelm SteffensCite this: Inorg. Chem. 1988, 27, 10, 1678–1686Publication Date (Print):May 1, 1988Publication History Published…
Abstract 12-Heteropoly acids exhibited high performance for selective oxidation of cyclopentene to glutaraldehyde with hydrogen peroxide. Especially, heteropoly acids with mixed addenda atoms of Mo and W, H3PMo12−xWxO40(x=1–9), showed excellent results.
The potentiodynamic behavior of polycrystalline nickel disk electrodes in the potential range of the active to passive transition was investigated in still and stirred sulfuric acid solutions containing potassium sulfate in the 0.4 ⩽ p H ⩽ 5.7 range. Voltammetric data derived with a nickel rotating disk electrode allo…
Oxycarbide glasses in the Mg‐Al‐Si‐O‐C system were produced at initial carbon levels of 0.0, 0.5, 1.0, 1.5, 2.0, and 2.5 wt%. Carbon was incorporated into the glass melts by means of SiC additions. The glasses were melted between 1750° and 1800°C under nitrogen atmospheres. The limit of carbon incorporation was reache…
Electrochemical doping‐undoping kinetics of electropolymerized polypyrrole (PPy) and the charge‐discharge characteristics of battery were found to show an interesting dependency on the kind of anions used for the preparation of PPy film. The relationship between the doping charge (anodization charge estimated from cyc…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDynamic mechanical studies on the crystal dispersion using ultradrawn polyethylene filmsMasaru Matsuo, Chie Sawatari, and Tomoko OhhataCite this: Macromolecules 1988, 21, 5, 1317–1324Publication Date (Print):May 1, 1988Publication History Published online1 May 2002Published…