Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHigh-resolution solid-state aluminum-27 and silicon-29 nuclear magnetic resonance study of pillared claysD. Plee, F. Borg, L. Gatineau, and J. J. FripiatCite this: J. Am. Chem. Soc. 1985, 107, 8, 2362–2369Publication Date (Print):April 1, 1985Publication History Published on…
Abstract The sorption and the permeation of iodine in water‐swollen poly(vinyl alcohol) (PVA) membranes and the formation of PVA–iodine complexes were studied. The logarithms of the permeability and the diffusion coefficient decreased approximately linearly with the increase in polymer volume fraction. When the membra…
Recent observations with both magnesia‐ and yttria‐partially‐stabilized zirconia (Mg‐ and Y‐PSZ) indicate an apparent anomaly between strength and toughness relations in these materials. The present communication attempts to rationalize these observations and suggests that the stress to initiate the tetragonal‐to‐mono…
This paper reports the results of an investigation into the effects of various environmental factors on CO2 corrosion of 9 to 25% Cr steel, with emphasis on the finding that each alloy has application criteria based on critical temperatures and CO2 partial pressures in a CO2-Cl− environment. It is also shown that each…
Abstract The interaction of Ni and Fe‐Ni base alloys with the reactive impurities H 2 O, CO, H 2 and CH 4 in simulated cooling gas of the primary circuit of the High Temperature Gas Cooled Reactor (HTGR) causes corrosion effects that can significantly influence the mechanical properties. Apart from the formation of su…
DC and ac electrical conductivities of silicon dioxide thermally grown on p‐ (boron‐doped) and n‐type (phosphorous‐doped) silicon have been measured in the temperature range of 25°–1100°C. Total dc conductivities varied from 10 −9 to 10 −16 Ω −1 cm −1 in the temperature range of 25°–960°C. Arrhenius plots for total dc…
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…