Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfrared spectroscopic evidence for silicon-oxygen double bonds: silanone and the silanoic and silicic acid moleculesRobert Withnall and Lester AndrewsCite this: J. Am. Chem. Soc. 1985, 107, 8, 2567–2568Publication Date (Print):April 1, 1985Publication History Published onli…
The kinetics of passive film growth on 316 stainless steel in 3% sodium chloride solution have been studied by dc and ac electrochemical measurements. The inverse logarithmic rates of current decay showed two stages of film growth, both controlled by a high field conduction mechanism. Impedance measurements were inter…
The skeletal plates and teeth of the echinoid Paracentrotus lividus contain a heterogeneous assemblage of macromolecules that are not part of the connective tissue, but are presumably intimately associated with the mineral phase. Upon dissolution of the Mg-calcite mineral phase, some of these molecules are insoluble.…
Abstract Finely divided solids can stabilize emulsion droplets provided the solids are partially wetted by both the disperse liquid phase and the continuous liquid phase. The stabilisation of oil/water emulsions by finely divided solids in the presence of suitable organics has been related to the three phase (solid/oi…
Abstract Sodium-saturated Wyoming bentonite was hydrothermally reacted at 150° and 250°C for 30 to 180 days to determine smectite alteration rates that might be applied to nuclear-waste repository design. Na-Ca solutions deficient in K were used to determine the role of interlayer cations in the creation of high layer…
Crystal structure parameters have been refined from single crystal x-ray intensity data collected on Ba2TiSi2O8 at 24 and 300°C. Anisotropic refinements in space group P4bm yielded residuals of 0.035 and 0.042 at 24 and 300°C, respectively. Pyroelectric measurements give a room temperature pyroelcctric coefficient of…
Abstract Anionic (KOH) polymerization of glycidol, or its trimethylsilyl ether (TMSGE) followed by hydrolysis, gives a low molecular weight, largely amorphous polymer that is not the reported 1,3‐polyglycidol but, based on 13 C‐NMR, largely a 1,4‐poly(3‐hydroxyoxetane) with much branching. This result is achieved by a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMesophase formation and chain rigidity in cellulose and derivatives. 3. Aggregation of cellulose in N,N-dimethylacetamide-lithium chlorideM. Terbojevich, Alessandro Cosani, G. Conio, Alberto Ciferri, and E. BianchiCite this: Macromolecules 1985, 18, 4, 640–646Publication Dat…
Relationships between melt structure and redox equilibria of iron in CaO-AlrOr-SiOr-Fe-O and MgO-AlrOr-SiOr-Fe-O melts with CalAl and Mg/Al > 0.5 have been determined with M 0.5, and undergoes a gradual coordination transformation in the Fe3*pFe range between 0.5 add 0.3. In this Fe3+pFe-range, tetrahedrally- and octa…
Ellipsometric measurements (in conjunction with observations of reflectance and cell current and voltage) have been performed in for Si wafers, of various crystallographic orientations and dopant types, during growth of surface films under anodic and cathodic bias and during open‐circuit etch back. The optical effects…
Anodic passivation of Type 316L stainless steel in a borate‐boric acid buffer solution was studied using cyclic voltammetry and Auger spectroscopy. Based on a comparison with the results obtained on the metals (iron, chromium, and nickel), the reduction peaks appearing in the voltammograms for the steel were attribute…
The selective removal and fixation of Cs and Sr have been studied in zeolite A and chabazite. Cesium ion was preferentially distributed into chabazite with a high distribution coefficient (K Cs>103 cm3·g−1) in the presence of NaCl (10−1 mol·dm−3). The K Sr values for zeolite A attained about 103 cm3·g−1 in the pH rang…
“Polyaniline” has been synthesized in various forms both chemically and electrochemically in aqueous media. The quinoid-benzenoid-diimine form, an insulator, is doped by dilute aqueous protonic acids to the metallic regime ([sgrave] ∼ 5 ohm−1cm−1; compressed pellet) to give the corresponding iminium salt. The polymer…
We determine the aspect-ratio dependence of the critical percolation threshold for various systems of rods. An exact expansion, due to Coniglio et al., tests the conjecture that the threshold is proportional to the inverse of the expected excluded volume. We confirm the conjecture, and show that the proportionality be…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCarbonyl methylenation using a titanium-aluminum (Tebbe) complexStanley H. Pine, Robert J. Pettit, Gregory D. Geib, Susana G. Cruz, Claudio H. Gallego, Tomas Tijerina, and Randall D. PineCite this: J. Org. Chem. 1985, 50, 8, 1212–1216Publication Date (Print):April 1, 1985Pub…
A segment of silk polyfilament suture [No. 2-0(USP)], ca. 10 cm long, was coated with a thin membrane (2-6 micron) of chitosan, N-acetylchitosan, or N-hexanoylchitosan. The suture was directly inserted into the lumen of dog's peripheral veins. The in vivo blood compatibility of these membranes was macroscopically dete…
The anodic oxide film on titanium has been studied by ellipsometry and SEM observation. Ex situ multiple‐angle‐of‐incidence and in situ ellipsometric measurements allow the complex refractive index to be estimated at for the titanium substrate and at for the anodic oxide film at wavelength 546.1 nm. The anodic oxide f…
Abstract Most countries intend to dispose of their high-level radioactive wastes by converting them into a solidified wasteform which is to be buried within the earth. SYNROC is a titanate ceramic wasteform which has been designed for this purpose on the basis of geochemical principles. It comprises essentially rutile…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDielectric relaxation of the crystal-amorphous interphase in poly(vinylidene fluoride) and its blends with poly(methyl methacrylate)Bernd Hahn, Joachim Wendorff, and Do Y. YoonCite this: Macromolecules 1985, 18, 4, 718–721Publication Date (Print):April 1, 1985Publication His…
The microstructure of strontium titanate internal boundary layer capacitors at various stages in their processing was studied by transmission electron microscopy of rapidly quenched and normally cooled samples. Compositions containing excess TiO 2 , Al 2 O 3 , and SiO 2 have a completely wetting liquid phase at the si…