Materials Literature
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A series of titanate-based layered perovskites having large values of the spontaneous polarization ${P}_{s}$ were developed for their applcations to nonvolatile ferroelectric random access memories. Among these, the Nd-modified bismuth titanate [${\mathrm{B}\mathrm{i}}_{4\ensuremath{-}x}{\mathrm{N}\mathrm{d}}_{x}{\mat…
We investigate the p-type doping difficulty in ZnO by first-principles total-energy calculations. The dopants being considered are group-I elements Li, Na, and K and group-V elements N, P, and As. We find that substitutional group-I elements are shallow acceptors, while substitutional group-V elements such as P and As…
The article gives an overview of the XANES technique contribution to the analysis of multicomponent catalysts. The theoretical basis of the technique, the interpretation of the energy position and intensity of XANES features, and the numerical methods developed to interpret XANES data on catalytic systems are describe…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTChemical Modification of Chitosan. 13. 1 Synthesis of Organosoluble, Palladium Adsorbable, and Biodegradable Chitosan Derivatives toward the Chemical Plating on Plastics†Hitoshi Sashiwa, Norioki Kawasaki, Atsuyoshi Nakayama, Einosuke Muraki, Noboru Yamamoto, Hong Zhu, Hiroshi N…
Long-lived radionuclides such as I 129 , Cs 135 and minor actinides can be incorporated in crystalline structures of several specific materials with high chemical durability. Apatites, zirconolite, monazites, thorium phosphate-diphosphate and hollandite are being studied at the CEA and among a scientific research grou…
In this paper we present a thermodynamic model for the adsorption of charged colloidal particles to air−water and oil−water interfaces from water-based suspensions and derive the equations for the respective particle adsorption isotherms. The effects of electrolyte concentration, surface charge density of both the par…
High density arrays of chromium (Cr) and layered gold/chromium (Au/Cr) nanodots and nanoholes in metal films were fabricated by evaporation onto nanoporous templates produced by the self-assembly of poly(styrene- b -methyl methacrylate) (P(S- b -MMA)) diblock copolymers. The cylindrical microdomains of the asymmetric…
With femtosecond resolution, using fluorescence up-conversion and transient absorption, we have carried out measurements on free base tetraphenylporphyrin (H 2 TPP) in benzene solution, pumping with ∼1300 cm -1 of excess vibrational energy in each of the Soret, Q y, and Q x bands, and also pumping the lowest vibration…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemical Vapor Deposition Methods for the Controlled Preparation of Supported Catalytic MaterialsPhilippe Serp, Philippe Kalck, and Roselyne FeurerView Author Information Laboratoire de Catalyse Chimie Fine et Polymères, Ecole Nationale Supérieure d'Ingénieurs en Arts Chimiq…
Femtosecond spectroscopic studies of zinc tetraphenylporphyrin (ZnTPP) in benzene and dichloromethane are reported, combining both fluorescence up-conversion and transient absorption measurements. The purpose is to investigate the initial electronic and vibrational relaxation of the S 1 and S 2 excited states, in a sy…
We propose coating spherical particles or droplets with anisotropic nanosized objects to allow micron-scale colloids to link or functionalize with a 4-fold valence, similar to the sp 3 hybridized chemical bonds associated with, e.g., carbon, silicon, and germanium. Candidates for such coatings include triblock copolym…
The adsorption of Ar on open-ended single-walled carbon nanotube bundles was studied. The amount of argon, which corresponds to the first coverage adsorbed on open-ended carbon nanotube bundles, was about 3 mmol/g. The isosteric heat of adsorption was obtained from the isothermal adsorption measurement in the low cove…
We investigated the coalescence of ultrathin carbon nanotubes (UTCNTs) using the tight-binding molecular dynamics simulation technique. We have found that two UTCNTs having the same or different chirality can coalesce without initially introducing atomic defects to enhance the reaction. The chiral index of the coalesc…
Ein Tetramer aus Dimeren: Ein sehr stabiles, kastenförmiges, cyclisches Tetramer (siehe Bild) wurde aus meso-Pyridyl-substituierten meso-meso-verknüpften Zink(II)-diporphyrinen erhalten, wobei die Porphyrineinheiten streng senkrecht zueinander orientiert sind.
This paper describes the onset of a new approach for the prediction of the nucleation rates of polymorphs crystallized from solution. The first step in the development of the new method is to come to an accurate prediction of the interfacial energy between the nucleus and solution, one of the key factors in the nuclea…
The thresholdless, hysteresis-free V-shape electro-optical switching in surface-stabilized ferroelectric liquid crystals, observed usually with a triangular voltage form, has been shown to be rather an apparent and not a real effect. Strictly speaking, it is observed only at one characteristic frequency f(i) and is ac…
We present the results of a simulation study of the effects of pressure on structural changes in silica glass. We observe structural relaxations in glass under pressure that involve large atomic displacements and are accompanied by breaking of the original bonds and forming of new ones. A large proportion of the new t…
An unexplored family of polyoxometalates has evolved through the synthesis and structural characterization of the first examples of MoV sulfite heteropolyanions. The dodecanuclear molybdenum(V) sulfite exhibits a unique structural motif among polyoxometalates (see picture; gray polyhedra represent MoVO6 octahedral uni…
The effects of impurities on driving-rate-dependent energy loss in ferromagnets are investigated by analyzing several well-defined models for magnetization reversal. The random-field Ising models are analyzed using a mean-field approximation and Monte Carlo simulation. The hysteresis loop area A is found to obey a uni…
We present a study of the optical properties of Tb 3+ -doped NaPO 3 –GdPO 4 -based glasses by means of optical absorption measurements performed at room temperature both before and after x-ray irradiation. A numerical decomposition of the absorption spectra is performed, and the possible nature of the defects responsi…