Materials Literature
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The polarized optical absorption (OA) and photoluminescence of Pr 3+ doped KGd(WO 4 ) 2 (KGW) single crystals have been measured at selected temperatures between 7 and 300 K. For the studied Pr concentrations, [Pr] = 0.03 × 10 20 -1.9 × 10 20 cm -3 , a unique site is observed. 74 energy levels were experimentally dete…
We fabricated a robust ultrathin film of a triblock copolymer, poly[styrene- b -(ethylene- co -butylene)- b -styrene] (SEBS), functionalized with 2% of maleic anhydride by melt/solution grafting to a chemically reactive silicon surface. We used epoxy-terminated self-assembling monolayers to functionalize silicon surfa…
Whereas correlation of physical process parameters with bacterial reduction is well established in thermal sterilisation, such a method is currently neither generally recognised nor possible for H2O2 decontamination. As a result, the efficiency and reproducibility of H2O2 decontamination and the course of the process…
A Raman spectrum consistent with that expected from an Al2OF6(2-) ion was observed when Na2O was dissolved in a eutectic LiF/NaF/KF (FLINAK) melt at 500 degrees C, which contained a low concentration of either AlF3 or Na3AlF6. Furthermore, it was possible to trap the Al2OF6(2-) ion in the frozen solid and to measure i…
We report a study of simple ABO 3 type perovskites BaTiO 3 , PbTiO 3 , KNbO 3 , SrTiO 3 and the relaxor perovskites PbSc 1/2 Nb 1/2 O 3 (PSN) in their cubic phase using hard synchrotron radiation and hot neutrons. Gram-Charlier expansions of the thermal parameters have been performed and have revealed interesting feat…
A performance assessment of the corrugated pore structure model (CPSM), developed in part 1 ( Ind. Eng. Chem. Res. 2000, 39, 3747), is carried out through a simulation of experimental gas sorption hysteresis, covering all IUPAC versions and that of the novel MCM-41 materials. The materials studied are an anodic alumin…
The lanthanide−transition-metal complex (H 2 O) 6 (DMF) 6 Ho 2 [Ni(CN) 4 ] 3, 1, was prepared from the reaction of Ho(NO 3 ) 3 ·6.5H 2 O with K 2 [Ni(CN) 4 ] at a 2:3 molar ratio in DMF (DMF = N, N -dimethylformamide). This compound is a model compound for studying the effects of H 2 O ligands on the coordination geom…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTControlled Cationic Ring-Opening Polymerization of MonothiocarbonateNobukatsu Nemoto, Fumio Sanda, and Takeshi EndoView Author Information Chemical Resources Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku,…
Recent investigations have implicated cagelike precursors in the unusually high gelation conversion (∼82%) of acid-catalyzed tetraethoxysilane. However, the statistical models used so far cannot capture kinetic or composition-dependent features of alkoxysilane polycondensation. Here we take a first step toward unified…
A brief review of the application of calorimetry to measurement of the kinetics of slow processes is presented. Processes degrading or otherwise changing the properties of materials often occur too slowly to be readily measured by conventional chemical analyses but can be measured in a relatively short period of time…
The new compounds [NBu 4 ][Cu(CN)X] (X = Br ( 1 ), I ( 2 )) and [NBu 4 ][Cu 3 (CN) 4 ]·CH 3 CN ( 3 ) have been prepared by reaction of [NBu 4 ]X with CuCN in acetone ( 1, 2 ) or acetonitrile ( 3 ), and have been characterized by X-ray crystallography and vibrational spectroscopy. Compounds 1 (C 34 H 72 Br 2 Cu 2 N 4,…
The synthesis of single-walled carbon nanotubes (SWNTs) in sooting flames is reported. This method offers a viable path towards low-cost large-scale synthesis, which is lacking in arc- and laser-based SWNT synthetic techniques. As with other methods, the growth of the SWNTs in the flame is catalyzed by the presence of…
The annealing effects of a dilute polyaniline solution on chemical and physical properties were investigated. Emeraldine base (EB) of polyaniline prepared by the conventional procedure was dissolved in 1-methyl-2-pyrrolidinone (NMP). After heating at 60−140 °C for 2 h, the color of PANi solution changed from deep blue…
Single-crystal magnetic susceptibility and specific heat studies of the one-dimensional copper complex [PM·Cu(NO 3 ) 2 ·(H 2 O) 2 ] n (PM = pyrimidine) show that it behaves like a uniform S = 1/2 antiferromagnetic Heisenberg chain, characterized by the exchange parameter J / k B = 36 K. Specific heat measurements in t…
Palladium nanoparticles dispersed on Al 2 O 3 were prepared via the sonochemical reduction of tetrachloropalladate(II) (Pd(II)) in an aqueous solution. The reduction of Pd(II) to metallic Pd successfully proceeded, even in the presence of Al 2 O 3 powder, by ultrasonic irradiation at 200 kHz. The rates of Pd(II) reduc…
Conformational changes of proteins adsorbing on biomaterial surfaces affect biocompatibility. Titanium is among the most successful biomaterials; however, the mechanisms leading to its biocompatibility are not yet understood. The primary objective of this study was to investigate the conformation of human plasma fibri…
We report on low-temperature photoconductivity (PC) in n-PbTe(Ga) epitaxial films prepared by the hot-wall technique on <111>-BaF_2 substrates. Variation of the substrate temperature allowed us to change the resistivity of the films from 10^8 down to 10_{-2} Ohm x cm at 4.2 K. The resistivity reduction is associated w…
Surface glass transition temperature,, of monodisperse polystyrene (PS) films was determined from the temperature dependence of lateral force at a given scanning rate. The end groups of the PS were composed of sec -butyl group and a repeating unit terminated by proton. of the PS films was discerned to be markedly lowe…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTLayered, Erasable, Ultrathin Polymer FilmsSvetlana A. Sukhishvili and Steve GranickView Author Information Department of Materials Science and Engineering University of Illinois at Urbana-Champaign 104 South Goodwin Ave., Urbana, Illinois 61801 Cite this: J. Am. Chem.…
This paper addresses numerical simulation of damage and fracture in concrete from the impact and penetration of shaped charge jets. We have modeled the jet penetration process with CALE, a two dimensional arbitrary Lagrange Eulerian hydrocode. We have looked at several constitutive models ranging from simple pressure…