Materials Literature
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The incorporation of Er 3+ into BaTiO 3 ceramics was investigated on samples containing 0.25, 0.5, 1, 2, 8, and 10 at.% of dopant, after sintering at 1350–1550°C in air. For Er 3+ concentrations ≤1 at.%, dense and large‐grained ceramics with low room‐temperature resistivity (10 2 –10 3 Ω·cm) were obtained. The observe…
[reaction: see text] The combination of the ionic liquid [bmim]PF(6) and DMAP provides a most simple and practical approach to the immobilization of OsO(4) as catalyst for olefin dihydroxylation. Both the catalyst and the ionic liquid can be repeatedly recycled and reused in the dihydroxylation of a variety of olefins…
Single-wall carbon nanotubes (SWNTs) were oxidatively functionalized by nitric acid treatment. The presence of carboxyl groups was proven by IR spectroscopy, matching earlier IR and NMR observations. Raman spectra in the radial breathing mode (RBM) and G line spectral windows were measured with six laser lines ranging…
Abstract A Mg-rich palygorskite sample from phosphorite deposits of Ganntour (Morocco) with the structural formula Si 8 ( Mg 2.6 Al 1.19 Fe 0.33 III □ 0.88 ) Ca 0.056 Na 0.024 K 0.104 O 20 ( OH ) 2 ( OH 2 ) 4 ⋅ 4 H 2 O , was studied by FTIR spectroscopy. In both OH-stretching and OH-bending regions, there is evidence…
La theorie des valences de liaisons est utilisee pour un examen de la stabilite possible de poles pour la structure de la tourmaline, avec une attention particuliere sur les solutions solides impliquant des couples de cations et d'anions heterovalents. D'importance primordiale a cet egard sont les sites O(1) et O(3),…
ABSTRACT: Xanthan gum coating was used to carry 5% Gluconal Cal, a mixture of calcium lactate and gluconate, and 0.2%α‐tocopheral acetate (vitamin E) by weight, respectively. Peeled baby carrots were dipped in the coating solutions, dried, and then stored at 2 °C and 85% relative humidity for up to 3 wk. Calcium and v…
An amphiphilic metallo-supramolecular poly(ethylene-co-butylene)-block-poly(ethylene oxide) diblock copolymer containing a bis(2,2′:6′,2″-terpyridine)ruthenium(II) complex as a supramolecular connection between the two constituting blocks was used to prepare stable aqueous micelles. The micelles were characterized by…
The crystal structure of simonkolleite, Zn5 (OH)8 Cl2 (H2O), rhombohedral, space group R¯3m, a 6.3412(3), c 23.646(1) Å, V 823.4(1) Å3, Z = 3, has been refined to an R index of 1.6 % based on 284 observed (5) reflections measured with MoK X-radiation. There are two distinct Zn sites fully occupied by Zn: Zn(1) is octa…
Results of first-principles augmented spherical-wave electronic-structure calculations for niobium dioxide are presented. Both metallic rutile and insulating low-temperature NbO 2 , which crystallizes in a distorted rutile structure, are correctly described within density functional theory and the local density approx…
Using two different full-potential ab initio techniques we introduce a simple rule based on the number of broken first-neighbour bonds to determine the surface energies of the three noble metals Cu, Ag and Au. When one bond is broken, the rearrangement of the electronic charge for these metals does not practically lea…
Abnormal grain growth (AGG) in alumina with anorthite liquid has been observed with varying anorthite and MgO contents, at 1620°C. When only anorthite is added to form a liquid matrix, the grain–liquid interfaces have either flat or hill‐and‐valley shapes indicating atomically flat (singular) structures. The large gra…
Nitrogen adsorption isotherms at 77 K and high pressure adsorption of supercritical methane at 303 K were measured on mesoporous carbon (CMK-1) prepared from the templating of MCM-48. These experimental isotherms were simulated with grand canonical Monte Carlo (GCMC) simulation using the rod-aligned slitlike pore (RSP…
Tests on large diameter specimens using a split Hopkinson pressure bar (SHPB) facility are essential to obtain representative dynamic characteristics of engineering materials such as rocks, concrete, and steel fiber-reinforced concrete (SFRC). However, direct application of the conventional SHPB technique to measure t…
Modelling and calculations are presented for the spectrum of initial DNA damage produced by 100 eV to 100 keV energetic electrons. Analysis of the initial spectrum of damage, based upon the source (direct energy deposition and reactions with diffusing OH radicals) and complexity of damage, indicates that the majority…
Summary The long‐term effects of intermittent flooding on soil properties were studied in field experiments on a Vertisol cropped with rice in Senegal. The dominant clay minerals were smectite and kaolinite. When the soil was reduced after flooding, its cation exchange capacity (CEC) increased to twice that of its oxi…
We present a method of fabricating single crystal silver nanowires based on the electroless deposition of silver into the pores of the polycarbonate membranes by the metal amplification process. A gold film on one side of the nanoporous membrane is used as the initiation layer for the silver crystal growth, while the…
Ge–Se chalcogenide glasses are characterized by relatively low hardness (0.39–2.35 GPa) and low fracture toughness (0.1–0.28 MPa·m 1/2 ). Actually, the hardness of chalcogen‐rich glasses is low enough so that the brittleness parameter, B = H / K c , is lower than that of silicate glasses. Whereas hardness and Young's…
Polypropylene and nylon 66 fabrics are subjected to atmospheric pressure He and He-O 2 plasmas for selected exposure time intervals. Scanning electron microscopy anal ysis of the fabrics shows no apparent changes in the plasma-treated nylon fiber surfaces, but significant surface morphological changes for the polyprop…
Abstract The dissolution of single bubbles of gases of low solubility kept stationary in a downward stream of water was studied. In “clean” water, two regimes are identified. Initially, the process is fast, consistent with the theory for circulating bubbles. Then, the mass‐transfer rate falls sharply to that predicted…
Tissue engineering of endothelial cells (EC) and chemical engineering with anticoagulant moieties has been undertaken in order to improve prosthetic graft patency and thrombogenicity. This was done by covalently bonding a compliant poly(carbonate-urea)urethane graft (MyoLink) with arginine-glycine-aspartate (RGD) or/a…