Materials Literature
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Intrinsic GaAs single crystals were deformed under hydrostatic pressure at temperatures down to 130K. Slip lines indicate that, below 300 K, deformation occurs by ½ ⟨101⟩{111} slip with frequent cross-slip. Above 300 K the crystal is so brittle that no slip lines are observed and the critical resolved shear stress τ c…
Dermal sheep collagen (DSC), which was crosslinked with 1, 4-butanediol diglycidyl ether (BD) by using four different conditions, was characterized and its biocompatibility was evaluated after subcutaneous implantation in rats. Crosslinking at pH 9.0 (BD90) or with successive epoxy and carbodiimide steps (BD45EN) resu…
Thermogravimetric analysis (TGA) has been used for many years to evaluate polymer thermal stability. The objective of this study is to determine if weight-loss curves from TGA and isothermal TGA (IGA) can be used to determine degradation activation energies and thus rank the thermal stability (TS) and thermooxidative…
Corrosion failure in most organic coating/substrate systems initiates as a local event that may originate at a chemical or physical heterogeneity within the coating itself or possibly in the substrate. The ability to detect, map the location, and make quantitative in situ measurements of coating heterogeneities will h…
The rate of subcritical crack growth in a metaphosphate Nd‐doped laser glass was measured using the double‐cleavage‐drilled compression (DCDC) method. The crack velocity is reported as a function of stress intensity at temperatures ranging from 296 to 573 K and in nitrogen with water vapor pressures ranging from 40 Pa…
Modulated thermoreflectance microscopy is applied to a complete thermal characterization of a thin film of gold (78 nm) or YBaCuO (300 nm) on a LaAlO3 substrate. The phase profile, measured at several modulation frequencies covering an appropriate range, is fitted with a rigorous thermal diffusion model. This leads to…
Although solid state metal oxides are of both fundamental and practical interest, the designed synthesis of such materials remains an elusive goal. However, valuable synthetic guidelines may be derived from a consideration of the plethora of Nature's remarkable materials which contain composites of molecules or micros…
We have calculated the electronic and atomic structures for 180° domain walls in PbTiO3 using a first-principles total energy method. Domain walls are found to be Pb centered and extremely narrow with a width of only about two lattice constants. The energy density of a domain wall is calculated to be 0.1–0.2 J/m2.
Thermoelectric properties of ceramic samples of NiO doped with Li are studied in the temperature range of 450–1280 K, with different Li contents. The substitution of Li for Ni atoms in a cubic NiO lattice results in a high thermoelectric power factor over a wide temperature range. Furthermore, Li substitution decrease…
We present results of an in situ STM study on the surface structure and anodic dissolution of Cu(111) electrodes in pure 0.01 M H 2 SO 4 solution and in solution containing the corrosion inhibitor benzotriazole (BTAH), which is aimed at an atomistic understanding of the dissolution process and the inhibitior effects.…
Pseudomonas cepacia is known as a rock phosphate (RP) solubilizer in bioreactors and in soils. The objectives of this study were to determine the production rates of gluconic acid (GA, pK d 3.41) and 2‐ketogluconic acid (KGA, pK d 2.66) by the bacteria in the presence of clay minerals which prevail in soils, and the r…
Abstract Thermoelectric performance of polyaniline can be improved by formation of multilayered film structure. The alternatively layered films are composed of electrically insulating emeraldine base layers and electrically conducting (±)-10-camphorsulfonic acid (CSA)-doped emeraldine salt layers. The multilayered fil…
We consider alignment of a symmetric diblock copolymer melt thin film or bulk phase by an electric field using a capacitor analogy. For the lamellar phase we show that alignment of the lamellae in the direction perpendicular to the bounding electrodes, compared to parallel alignment, occurs for thicker films. For thin…
Donor- and acceptor-substituted alkynylated chromium carbonyl arene complexes Cr(CO) 2 L( η 6 -R 1 -C 6 H 4 )(C⋮C) n R 2 ( 1, n = 1, L = CO, PPh 3, R 1 = H, o -formyl, R 2 = p -C 6 H 4 -NMe 2, p -C 6 H 4 -NO 2, ferrocenyl; 3, n = 2, L = CO, R 1 = H, R 2 = p -C 6 H 4 -NMe 2, p -C 6 H 4 -NO 2, ferrocenyl) are easily acc…
Data are presented on real time (VISAR) measurements of the spall fracture of copper for various pulse durations and tensile strain rates at the spall plane. The impactors consist of Teflon, Y-cut quartz, and a tungsten heavy alloy. VISAR data are compared with finite-difference calculations employing a rate-dependent…
Europium(III) (7)F(0) --> (5)D(0) excitation spectroscopy is used to determine if the anions carbonate and phosphate present in physiological fluids are able to displace water molecules from the first coordination sphere of Eu(3+) analogues of Gd(3+) MRI contrast agents. A lengthening of the Eu(3+) excited state lifet…
A small- and wide-angle X-ray scattering study was performed on two metallocene catalyzed isotactic polypropylene (miPP) resins. The results were compared with two similar molecular weight Ziegler–Natta catalyzed isotactic polypropylene (zniPP) materials. Wide-angle X-ray diffraction (WAXD) results showed the existenc…
In this work, several PS/HDPE (high density polyethylene), PS/LLDPE (linear low density polyethylene) and PS/ULDPE (ultra low density polyethylene) blends were prepared in a composition range were atactic polystyrene (PS) was always the matrix component. All the types of polyethylenes employed, when dispersed into dro…
Grain growth kinetics for nanostructured nickel was studied by means of isothermal and isochronal annealing and TEM. The range of temperature for the isothermal and isochronal annealing has been selected between 603K and 683K. The isothermal curves for grain size show that an explosive grain growth occurs in the early…
Nanometer‐sized BaTiO 3 powders have been synthesized hydrothermally from Ba(OH) 2 and titanium alkoxide at 150°C for 2 h, and the Ba/Ti ratio has been measured with an accuracy of ±0.003. Stoichiometric powders can be obtained by adjusting the Ba/Ti ratio of the reactants to a value of 1.018. At a lower Ba/Ti ratio,…