Materials Literature
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Corrosion phenomena of alloy 625 (UNS N06625) were investigated in oxygenated aqueous solutions containing sulfuric acid (H2SO4), sodium hydrogen sulfate (NaHSO4), or sodium sulfate (Na2SO4) and in deaerated H2SO4 solution. Tests were conducted at temperatures and pressures up to 500°C and 38 MPa, respectively. Corros…
Theoretical coulovoltammograms associated with the evolution of anodic charges when a polypyrrole film, which was previously compacted at a strong negative potential in a 0.1 M LiClO 4 propylene carbonate solution, was submitted to anodic potential sweeps were compared with experimental responses. The electrochemicall…
Abstract This work demonstrates the validity of approximating cathodoluminescence generation throughout the electron interaction volume by the total electron energy loss profile. The energy loss profiles in multilayer specimens were accurately calculated using the Monte Carlo simulation CASINO. Resolution of cathodolu…
Opportunities and challenges for the use of starch in the production, coating, and conversion of paper are reviewed. In the U.S. paper industry, starch has to compete with many synthetic materials that often outperform starch in molecular design, charge adjustment, viscosity characteristics, and binding power. Commodi…
Electrodeposition of Copper and Copper‐Aluminum Alloys from a Room‐Temperature Chloroaluminate Molten Salt, Tierney, Brian J., Pitner, William R., Mitchell, John A., Hussey, Charles L., Stafford, Gery R.
Polar domains of the relaxor ferroelectric Pb(Mg1/3Nb2/3)O3 were observed by transmission electron microscopy in dark-field images of the fundamental reflection. Macroscopic domain structure of the rhombohedral phase appears below the transition temperature of about 220 K, though microscopic polar domains still exist…
The 1/3 (1010) partial dislocation plays a crucial role in the plastic deformation of sapphire (α-Al2O3). During deformation at high temperatures, basal slip (1/3(1120) (0001)) has the lowest critical resolved shear stress; 1/3 (1120) perfect dislocations undergo dissociation (which is probably restricted to the dislo…
Tetragonal zirconia (t‐ZrO 2 ) solid solutions were prepared with additions of up to 1.5 mol% of niobium oxide (Nb 2 O 5 ) into 3‐mol%‐yttria‐stabilized t‐ZrO 2 (3Y‐TZP). The influence of pentavalent cation doping on fracture toughness, ionic conductivity, and the tetragonal‐to‐monoclinic phase transformation in the t…
Ordered structures in samples of Bisphenol A polycarbonate (BPAPC) prepared by varying thermal and solvent conditions were investigated by infrared and Raman spectroscopy, wide-angle X-ray scattering (WAXS), and differential scanning calorimetry (DSC). Based on the spectroscopic analysis and ab initio quantum mechanic…
We report the controlled adsorption of individual multi- and single-walled carbon nanotubes from purified aqueous dispersions onto chemically modified silicon oxide surfaces as well as on predefined electrode patterns (100 nm electrode separation). Detailed structural investigations were performed using scanning force…
ABSTRACT Depectinized control (CTJ) and ascorbic acid treated (AAJ) apple juices were filtered through microfiltration (MF, 0.2 m) and ultrafiltration (UF, 0.02 m) ceramic tubular membranes. Under optimal conditions (8 m/s, 414 kPa and 50°C), the UF membrane resulted in higher steady state flux and less fouling than t…
An amphiphilic iron(II) complex [Fe II L 2 (NCS) 2, where L is a substituted bipyridine] exhibiting a thermal spin-crossover phenomenon around room temperature is chemically unstable at the gas−water interface. However, it forms a perfectly stable Langmuir film when formamide−water mixtures are used as a subphase. Aft…
Using a high-quality barium titanate single crystal grown by a top-seeded solution growth method, its microscopic and macroscopic symmetries were investigated by Raman scattering measurement and polarizing microscopy, respectively. Moreover, their temperature dependences through Curie temperature were also studied. As…
The pressure‐sensitive equilibrium among anorthite, quartz and the Ca‐tschermak component in clinopyroxene (CaAl 2 SiO 6 ; CaTs), CaAl 2 SiOCpx6+SiOQtz2=CaAl 2 Si 2 OPl8 (SCAn) ,can be used as a geobarometer in granulites with the proper assemblage, and has been calibrated using mineral composition data from partial m…
Mussel byssal threads contain unusual block copolymer-like proteins that combine collagen with flanking domains that resemble silk-fibroin (preCol-D) or elastin (preCol-P). These are distributed in complementary gradients along the length of the threads and as precursors in the mussel foot. We discuss a 76-kDa precurs…
We report on a laboratory study of the atmospheric corrosion of NaCl‐treated zinc in air containing different concentrations of carbon dioxide (<l, 100, 350, 1000, and 40,000 ppm). Each sample was exposed individually to synthetic atmospheres with careful control of CO 2 concentration and flow conditions. The relative…
The monotonic tension, creep, and fatigue behavior of an enhanced SiC/SiC composite was investigated at a temperature of 1300°C in air and argon. The improved creep and fatigue resistances were determined and compared to those of the standard SiC/SiC composite. The effects of additives (glass‐forming, boron‐based part…
The theoretical mechanical response of 12 cubic metals (Al, Cu, Mo, Na, Li, K, Rb, Nb, Fe, Ni, Au, and Ag) to unconstrained uniaxial loadings, coaxial with each of the three principal symmetry directions, is analyzed, at finite strain, in the framework of the embedded-atom method model calculations. The models have be…
Partial discharge tests can determine which motor and generator stator windings are experiencing insulation problems. A deteriorated winding has a PD activity which can be 30 times or more higher than a winding in good condition. This great difference in PD activity enables even nonspecialized maintenance personnel to…
The interfacial properties of SiC/SiC composites with interphases that consist of (C‐SiC) sequences deposited on the fibers have been determined by single‐fiber push‐out tests. The matrix has been reinforced with either as‐received or treated Nicalon fibers. The measured interfacial properties are correlated with the…