Materials Literature
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Abstract Passive films formed on a Fe 24 Cr alloy in 0.5 M H 2 SO 4 at 0.7 V are characterized by AES depth profiling and XPS. Obtained results and evaluation procedures are critically compared. It is found that correction for electron escape depth significantly improves the accuracy of AES profile data. The use of lo…
We have investigated the temperature and coverage-dependent transformations of the ordered structures of oxygen on Pd(100). The four ordered structures are the chemisorbed c(2×2) and p(2×2) lattices, and the reconstructed p(5×5) and ((5)1/2×(5)1/2)R27° lattices. We present evidence that the p(5×5) reconstruction forms…
Abstract Gas phase chemical modification (GCM) is found to be more preferable as a pretreatment for the XPS surface analysis of polymer materials than the conventional liquid phase treatment because it can circumvent problems such as solvent contamination and swelling. We have tried the quantification of the surface c…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDirect sulfation of calcium carbonateMichael J. H. Snow, John P. Longwell, and Adel F. SarofimCite this: Ind. Eng. Chem. Res. 1988, 27, 2, 268–273Publication Date (Print):February 1, 1988Publication History Published online1 May 2002Published inissue 1 February 1988https://p…
The work of Langmuir and Blodgett is widely referenced among researchers in the field of ice accretion who are interested in the impingement characteristics of cloud and spray droplets on circular cylinders. In this paper we check the accuracy of those early calculations by integrating the droplet trajectories on a mo…
Hydrophilic sulfur sols prepared from sodium thiosulfate and concentrated sulfuric acid and purified by repeated NaCl precipitation and peptization in water have been studied by chemical analysis, vibrational spectroscopy, ion-pair chromatography and reversed-phase HPLC. The composition of the sol is Na 1.64 S 28.6 O…
Use is made of the theory of dislocation-induced X-ray diffraction line broadening in the form presented by Krivoglaz, Martynenko & Ryaboshapka [ Fiz. Metall. Metalloved. (1983), 55 , 5–171 to express the so-called orientation factors occurring in the relations of diffraction profile parameters ( e.g. Fourier coef…
Melt infiltration offers an alternative route to the synthesis of fully dense ceramic matrix composites. Necessary conditions with respect to chemical reactivity, melt viscosity, and wetting must be satisfied. Other properties of the reinforcement and matrix constituents must also be considered. With these restriction…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSuper-drawing of ultrahigh molecular weight polyethylene. 1. Effect of techniques on drawing of single crystal matsTetsuo Kanamoto, Akeharu Tsuruta, Koji Tanaka, Masatami Takeda, and Roger S. PorterCite this: Macromolecules 1988, 21, 2, 470–477Publication Date (Print):Februa…
A physical model describing corrosion processes on a 3‐D inhomogeneous surface is developed. The derived theoretical transfer function is discussed in terms of transport and charge‐transfer controlled corrosion steps. Simulations show "depressed capacitive semicircles" depending on the hydrodynamic conditions and the…
A theory for the growth of columnar microstructures in thin films is presented. The zone-I to zone-II transition temperature is predicted. The surface morphology and the columnar grain structure are obtained both analytically and numerically, and the scaling behavior of the columnar grain size with film thickness is d…
Phosphate enrichment experiments were conducted year-round at the experimental troughs research apparatus (EXTRA) on the South Thompson River in British Columbia to determine the relationship between external concentration of orthophosphate and the growth rates of lotic periphytic diatom communities. Growth rate satur…
In nonoxidizing high-temperature environments, carbon-carbon composites retain room temperature properties to more than 2225 C; in oxidizing environments, the variety of coatings thus far developed limits maximum operating temperatures to about 1600 C. The high thermal conductivity and low thermal expansion of these c…
Abstract Results of experimental and modeling studies of the peroxide promoted degradation of polypropylene (PP) are presented. Experiments were carried out, in glass ampoules and in a plasticating extruder. The initiator, 2.5‐dimethyl‐2,5‐bis(tert‐butylperoxy)hexane was used as a radical generator. The extruder used…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydrogen bonding in polymer blends. 3. Blends involving polymers containing methacrylic acid and ether groupsJoon Y. Lee, Paul C. Painter, and Michael M. ColemanCite this: Macromolecules 1988, 21, 2, 346–354Publication Date (Print):February 1, 1988Publication History Publish…
X-ray diffraction line profiles of plastically deformed Cu single crystals orientated for ideal multiple slip were recently found to be markedly asymmetric. A theory is developed to interpret this kind of asymmetric line broadening in terms of the average dislocation density, the dipole polarization of the dislocation…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInterpretation of atomic displacement parameters from diffraction studies of crystalsJack D. Dunitz, Verner Schomaker, and Kenneth N. TruebloodCite this: J. Phys. Chem. 1988, 92, 4, 856–867Publication Date (Print):February 1, 1988Publication History Published online1 May 200…
X-ray solution scattering data from skeletal muscle troponin C and from calmodulin have been measured. Modeling studies based on the crystal structure coordinates for these proteins show discrepancies between the solution data and the crystal structure that indicate that if the size and shape of the globular domains a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of polyphenylene from a cis-dihydrocatechol biologically produced monomerD. G. H. Ballard, A. Courtis, I. M. Shirley, and S. C. TaylorCite this: Macromolecules 1988, 21, 2, 294–304Publication Date (Print):February 1, 1988Publication History Published online1 May 20…
Methods have been developed that allow facile X-ray data collection for biological macromolecules at cryogenic (near liquid N2) temperatures. The crystals are first transferred from their mother liquor to a hydrocarbon environment, then mounted with a standard glass fiber (no capillary), and flash cooled in situ with…