Materials Literature
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The layered manganite La 1.2 Sr 1.8 Mn 2 O 7 is important in that it displays giant negative magnetoresistance properties, and its study complements the growing body of what we know about the complex size−charge−temperature−magnetic field parameter space of the perovskites A III 1 - x A‘ II x MnO 3 . We report here th…
Electrospray mass spectrometry provides a rapid, convenient technique for characterizing and studying the chemistry of anionic metal sulfide thiolate clusters. Negative-ion electrospray mass spectra have been recorded for the thiophenolate-capped clusters [Me(4)N](4)[E(4)Cd(10)(SPh)(16)] (E = S, Se), [Me(4)N](4)[S(4)Z…
Other| August 01, 1997 Experimental study of Th-bearing LaPO4 (780 °C, 200 MPa); implications for monazite and actinide orthophosphate stability Renaud Podor; Renaud Podor Centre de Recherches sur la Geologie des Matieres Premieres Minerales et Energetiques, France Search for other works by this author on: GSW Google…
New polyconjugated oligomers—oligoaminophenols—have been prepared by the oxidative polycondensation reaction of aminophenols (APs) in the presence of oxidants (H2O2, NaOCl, KOH plus O2). It has been established that the reactivity of AP increases with the series of m- < o- < p-isomers in this reaction. The oligoaminop…
We report a systematic study of the electronic structure of the five metcars in the title using anion photoelectron spectroscopy. The electron affinities of the metcars are measured and are found to be metal dependent and increase from Ti 8 C 12 to Cr 8 C 12 . The electronic structures of Zr 8 C 12 and Nb 8 C 12 are f…
The transport of oxygen in a porous perovskite solid oxide fuel cell cathode is modeled by use of the principles of porous electrode modeling, by taking into account exchange kinetics at the gas/electrode interface, bulk diffusion of oxygen vacancies, surface diffusion of adsorbed oxygen atoms, and electrochemical kin…
The liquid phase hydrogenation of maleic anhydride and intermediates was investigated using copper-based and noble metal catalysts. The experiments were performed in a stirred tank slurry reactor in discontinuous as well as continuous operation. Copper chromites and noble metal catalysts were found to be suitable for…
There have been many experiments that have determined the wetting behavior of liquids on low-energy solid surfaces. These experiments show that, in general, the contact angle, theta, measured through the liquid, increases with increasing liquid-vapor surface tension, sigmalv. Surprisingly, in experiments with some suc…
The structural, vibrational, and electronic properties of liquid GeSe${}_{2}$ are investigated using ab initio molecular dynamics. The static structure factor $S(Q)$ and the pair-correlation functions of our model are in good agreement with experiment. We find many similarities between the topology of the liquid and t…
Exposure of luminescent n-type porous Si to gaseous molecular oxygen results in reversible quenching of the visible photoluminescence associated with this material. Steady-state and time-resolved photoluminescence quenching follow a dynamic Stern−Volmer model. From the Stern−Volmer analysis, the quenching rate constan…
Abstract Intercalates from an ordered halloysite with urea and potassium acetate were studied using Raman microscopy. The urea intercalate showed new Raman bands at 3387, 3410, 3497 and 3598 cm −1 which were attributed to the formation of a urea-Si 2 O 5 complex. New Raman bands were observed at 3585 and 3602 cm −1 fo…
The crystal structures and textures of a family of sequence-designed periodic polypeptides were investigated and analyzed using X-ray diffraction, vibrational spectroscopy, and cross-polarization magic angle spinning 13 C nuclear magnetic resonance. The repetitive amino acid sequences are described by −[(AG) x EG]−, w…
A composite of polyaniline (PANI) with both conducting and ferromagnetic functions was synthesized by a chemical method proposed by the authors. For the electrical properties, its room-temperature conductivity was measured to be about 10−1 S/cm when doped with 1.0M HCl, and it is independent of the preparation conditi…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTSolvothermal Co-reduction Route to the Nanocrystalline III−V Semiconductor InAsYa-Dong Li, Xiang-Feng Duan, Yi-Tai Qian, Li Yang, Ming-Rong Ji, and Cheng-Wei LiView Author Information Structure Research Laboratory and Department of Chemistry University of Science and T…
Neutron diffraction studies have been made of ice nucleation in various forms of porous sol−gel silicas and ordered aluminosilicates. It is shown that the crystal structure of the ice exhibits significant variation according to the conditions and often has a diffraction pattern composed of a hybrid with both cubic and…
Molecular dynamics simulations of calcium silicate (CaSiO 3 )intergranular films that were formed during the liquid‐phase sintering of alumina (Al 2 O 3 )ceramics were conducted. A constant‐pressure algorithm was used in the simulations to accommodate changes in the sample size during heat treatment and tensile tests.…
The phenomenon of photoinduced molecular reorientation of absorbing nematic liquid crystals is analyzed in a macroscopic general framework and with a specific molecular model. The photoinduced torque responsible for the reorientation is shown to describe a transfer of angular momentum from the molecule center-of-mass…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTStructural Distortion in Five-Coordinate Nitrosyl Iron Porphyrins. Axial Ligand Tilting and Its Effect on Equatorial GeometryMary K. Ellison and W. Robert ScheidtView Author Information The Department of Chemistry and Biochemistry University of Notre Dame, Notre Dame,…
The scanning electrochemical microscope (SECM) is used to generate localized corrosion at passivating iron surfaces by using the tip to generate ions. Use of the SECM allows the rapid establishment of a locally aggressive chemical environment at a preselected site on the iron surface. The susceptibility for passive la…
The melting behavior of isothermally crystallized PET has been studied using linear heating in a differential scanning calorimeter (DSC). Variables such as crystallization temperature, crystallization time, heating rate, and average molecular weight are the main focus of the study. On the basis of several experimental…