Materials Literature
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Abstract Dispersion of clay affects soil physical properties and can result in clay transport with surface runoff or with percolating water moving through soil macropores. The water‐dispersihle fine clay (<0.2 µm) is probably the most mobile fraction with percolating water. This study was conducted to characterize…
A new type of passivity in carbon (C) steels that occurs in the correct range of carbon dioxide (CO2) bicarbonate (HCO3–), sodium chloride (NaCl), and potential was discovered. C steels normally become passive at about -0.65 VSCE in sodium bicarbonate (NaHCO3) solutions. In sodium chloride (NaCl) solutions, pitting oc…
Six samples of congruently melting lithium niobate (∼Li0.95Nb1.01O3) have been examined by powder x-ray diffraction for the occurrence of niobium antisite defects (niobium on lithium sites). Contrary to current thinking, we have found no evidence for the occurrence of high concentrations of such defects, which also re…
Abstract The perfectly alternating ethylene carbon monoxide copolymer (polyketone; POK) has been studied by means of 1 H nuclear magnetic resonance and thermal analysis, and the crystal structure, determined by wide angle x‐ray scattering methods, is presented. The crystal structure of this polymer in well‐oriented fi…
Polymer chains are irreversibly grafted to a surface in a good solvent and the solvent quality is then reduced dramatically. The chains then collapse. If the grafting density is very high then the collapsed layer should be fairly uniform. However, at lower grafting densities the chains are predicted to form surface “m…
Effects of temperature on stress corrosion crack growth rates were studied on three heats of sensitized type 304 (UNS S30400) stainless steel (SS) and one heat of sensitized alloy 600 (UNS N06600). Data were obtained using reversed direct current (DC) potential drop crack length monitoring on 25-mm compact-type (CT) s…
It is generally known that secondary cellulose acetate (with 53 to 56% acetyl groups) is suitable for thermoplastic processing. With appropriate plasticizers a plastic material is obtained which excels in transparency and pleasant texture, and it is therefore often used for tool handles, combs, spectacle frames, and t…
It has been proposed that the binding of Zn2+ to alpha-lactalbumin switches the conformation to one akin to a state intermediate in the folding of the protein. However, the high resolution x-ray crystal structure of human alpha-lactalbumin-Zn2+ complex at 1.7-A resolution (pH 7.6) does not reveal any significant chang…
The microstructures of alumina‐aluminum titanate (A‐AT) composites have been tailored with the intent of altering their crack‐resistance ( R ‐ or T ‐curve) behavior and resulting flaw tolerance. Specifically, two microstructural parameters which influence grain‐localized crack bridging, viz., (i) internal residual str…
The structure of isocitrate dehydrogenase (IDH) with a bound complex of isocitrate, NADP+, and Ca2+ was solved at 2.5-A resolution and compared by difference mapping against previously determined enzymatic complexes. Calcium replaces magnesium in the binding of metal-substrate chelate complex, resulting in a substanti…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInterior hydroxyls of the silica gel system as studied by silicon-29 CP-MAS NMR spectroscopyI Ssuer Chuang, David R. Kinney, and Gary E. MacielCite this: J. Am. Chem. Soc. 1993, 115, 19, 8695–8705Publication Date (Print):September 1, 1993Publication History Published online1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics of iron(II) oxygenation at low partial pressure of oxygen in the presence of natural organic matterLiyuan Liang, J. Andrew McNabb, John M. Paulk, Baohua Gu, and John F. McCarthyCite this: Environ. Sci. Technol. 1993, 27, 9, 1864–1870Publication Date (Print):Septembe…
The intrinsic thermal resistance of dielectric crystals at low temperatures due to three-phonon Umklapp processes has been treated theoretically, taking account of the restrictions imposed by wave-vector selection and frequency conservation rules, as well as the known phonon-dispersion curves. Since low-frequency phon…
The symmetry-predicted nonzero components of the piezoelectric coefficient, dielectric constant, and elastic compliance matrices have been determined on poly(vinylidene fluoride/trifluoroethylene)(75/25) copolymer at room temperature and a frequency of 500 Hz. The temperature dependence of each of the complex piezoele…
In many cases, evidently inert and nontoxic biomaterials may trigger procoagulant and inflammatory responses. Because most polymeric biomaterials accumulate a surface layer of protein immediately after implantation, these adverse reactions may stem from secondary interactions between the host and this surface layer of…
<p>The ligand 2,6-bis(l-methylbenzimidazol-2-yl)pyridine (mbzimpy, 1) reacts with lanthanide perchlorate in acetonitrile to give the successive complexes [Ln(mbzimpy)„]<sup>3+</sup> (n = 1-3). Tris complexes were isolated for La, Eu, Gd, and Tb, while a bis complex only could be crystallized for Lu.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMicrophase separation of ABC-type triblock copolymersHatsumi Nakazawa and Takao OhtaCite this: Macromolecules 1993, 26, 20, 5503–5511Publication Date (Print):September 1, 1993Publication History Published online1 May 2002Published inissue 1 September 1993https://pubs.acs.org…
Scanning electrochemical microscopy, SECM, of oxide‐covered titanium foils (∼50 Å oxide thickness) immersed in potassium bromide solutions is reported. Electrogeneration of bromine at the film is shown to occur rapidly at a few microscopic surface sites. The regions of intense faradaic activity observed in SECM images…
An atomistic simulation technique has been used to predict the spatial arrangement of the dopant species sodium, lithium, and chlorine within the zinc oxide lattice. The alkaline oxides are preferentially incorporated via a self‐compensating mode, forming interstitial cations which hinder the migration of zinc interst…
We have studied the static magnetic properties of three different M-type doped barium ferrite compounds prepared by the glass crystallization method. The zero-field-cooled (ZFC) and field-cooled (FC) processes have been recorded at low field and they all show the typical features of a small particle system. The ZFC cu…