Materials Literature
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The formation of inhomogeneous distributions of vacancy loops in irradiated materials is discussed in the framework of a dynamical model based on the rate theory of radiation damage. Dislocation structures are associated with dynamical instabilities due to the competition between defect motion and interactions. The de…
Abstract Surface excesses of the bivalent ions Ca 2+ , Mg 2+ , and SO 2‐ 4 were measured on a Brazilian Oxisol suspended in Ca(ClO 4 ) 2 ), Mg(ClO4) 2 , or Li 2 SO 4 solution. The surface excess of Ca 2+ increased proportionally with pH in the range 2.5 to 6.0 and was independent of ionic strength in the range 26 to 6…
Abstract The protection provided by intumescent chars against the action of the flame is generally attributed to their physical insulating properties. These in turn depend on the physical chemical structure of swollen char, which however has been scarcely studied. It is shown that scanning electron microscopy and micr…
Abstract Aliphatic–aromatic polyamides were synthesized by the palladium‐catalyzed polycondensation of aliphatic diamines, aromatic dibromides, and carbon monoxide. The effects of variables, such as the kind and amount of base, reaction temperature, and the kind of palladium catalyst were investigated in detail on the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of poly(iminocarbonates): degradable polymers with potential applications as disposable plastics and as biomaterialsChun Li and Joachim KohnCite this: Macromolecules 1989, 22, 5, 2029–2036Publication Date (Print):May 1, 1989Publication History Published online1 May…
This paper presents a rational method for a quantitative characterization of intergranular stress corrosion cracking (IGSCC) from results of constant extension rate tests (CERTs). The basic experimental datum used is the morphological information present in a specimen at the end of a CERT; this information is expresse…
The effect of impurity doping on the electrostrictive properties (the magnitude of the induced strain and hysteresis) has been investigated for (Pb,Ba) (Zr,Ti)O3 ceramics. When doping with a donor impurity, the strain becomes larger and the degree of hysteresis becomes smaller than that observed for non-doped samples,…
The objective of this study was to evaluate the Kelowna multiple element extractant and some EDTA and DTPA modifications for simultaneous determination of potassium and sodium in acid and calcareous soils. To that end, the relationships between K and Na concentrations extracted with 1 N NH 4 OAc and the Kelowna multip…
Ceria‐doped tetragonal zirconia (Ce‐TZP)/alumina (Al 2 O 3 ) composites were fabricated by sintering at 1450° to 1600°C in air, followed by hot isostatic pressing (postsintering hot isostatic pressing) at 1450°C and 100 MPa in an 80 vol% Ar–20 vol% O 2 gas atmosphere. Dispersion of Al 2 O 3 particles into Ce‐TZP was u…
Abstract We have found, that heteropolyacids (HPA) are efficient initiators of cationic polymerizations, including polymerizations of cyclic ethers and acetals, providing high‐molecular‐weight polymers. In several systems (e. g. THF, 1,3‐dioxolane) the degree of polymerization is given by the ratio of concentrations o…
Although toroidal cores wound from grain-oriented silicon iron strip are basically simple devices used in many applications, their magnetic properties are known to vary in a complex manner with core dimensions. The theoretical effects of radial magnetic field and flux density variation, interlamina normal flux, and wi…
The anodic behavior of iron in 0.032 mol·L−1 NaCl/0.003 mol·L−1 NaHCO3 and 1 mol·L−1 Na2SO4/0.003 mol·L−1 NaHCO3 solutions containing 0.05 mol·L−1 H2S at ambient temperature was studied using cyclic voltammetry and the potentiostatic technique. In both solutions, a nonprotective film of mackinawite (Fe(1+x)S) was form…
A photoelectron diffraction study of Ta(100), employing the surface shifted 4 f core levels, has been performed to determine its first interplanar spacing. Photoemission intensities of the bulk and surface shifted 4 f core levels were measured as a function of photon energy at normal emission and near the 〈111〉 symmet…
The observation of a new critical point in liquid-crystal phase transitions is reported. Detailed tilt angle, polarization, and susceptibility measurements of a ferroelectric liquid crystal in the presence of an applied dc electric field show that a first-order transition between the polarized smectic-A phase and the…
Phase transitions of aqueous suspensions of droplets of smectogens have been studied using the collective Cotton-Mouton (CM) technique. Two compounds were examined: NPOOB and 8OCB. A statistical model (previously developed for suspensions of nematogens) has been adapted to describe the collective CM effect in these sy…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemistry of organosilicon compounds. 255. Preparation and x-ray crystal structure of the first pentacoordinate silylsilicatesMitsuo Kira, Kazuhiko Sato, Chizuko Kabuto, and Hideki SakuraiCite this: J. Am. Chem. Soc. 1989, 111, 10, 3747–3748Publication Date (Print):May 1, 19…
As a first phase in the investigation of the feasibility of storing light water reactor spent fuel in air, oxidation tests were performed on nonirradiated UO2 pellets over the temperature range of 150 to 345°C. The objective of the tests was to determine the important independent variables that affect the oxidation be…
The molecular transport of small molecules through polymer films has been the subject of active research over almost three decades [1–8]. The main thrust in this area is either to accumulate a large body of experimental data to assess the stability of polymer films for extreme serviceability or to develop new theories…
Electrochromic films of a series of binary composite hydroxides of nickel and other metals (in a ratio of about 1:10) were deposited cathodically from mixed nitrate solutions onto transparent, conducting substrates. Visible spectra of the composite hydroxides were generally similar to those for nickel hydroxide, itsel…
Plasma chemical vapor deposition (CVD) at 13.56 MHz has been used to produce diamond particles in two different inductively coupled systems with a mixture of methane and hydrogen. The effect of a diamondlike carbon (DLC) overcoating on silicon, niobium, and stainless-steel substrates has been investigated and in the c…