Materials Literature
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Aqueous dispersions of rodlike gold particles are obtained by electrodeposition in nanopores of anodized alumina attached to a conductive support followed by dissolution of the alumina and stabilization of the rods with poly(vinylpyrrolydon). The obtained sol of monodisperse gold rods is examined by electron microscop…
In situ laser Raman spectra of electrochemically precipitated thin‐film electrodes in alkaline NaOH electrolytes were recorded, and the effect of repeated charge‐discharge cycling on the structure and phase composition of the discharged and charged films was investigated. Careful deconvolution analyses of the Raman an…
Spin−orbit coupling (SOC) calculations are performed along the reaction pathway of the oxidation process, FeO + + H 2 → Fe + + H 2 O (eq 1). Selection rules are derived for SOC between different spin situations, and are applied to understand the computed SOC patterns along the oxidation pathway, and their relationship…
The crystal structures of three compounds have been determined at room temperature, namely [Gd(hfa) 3 Cu(salen)] ( 1 ), [Y(hfa) 3 Cu(salen)] ( 2 ), and [Gd(hfa) 3 Cu(salen)(Meim)] ( 3 ), and the crystal structure of a fourth compound, [La(hfa) 3 (H 2 O)Cu(salen)] ( 4 ), has been determined at −100 °C; hfa = hexafluoro…
Layered birnessite-type manganese oxides have been synthesized by sol−gel reactions involving KMnO 4 or NaMnO 4 with glucose. These microporous manganese oxides are designated as octahedral layer materials, K-OL-1 and Na-OL-1, because their layered structure consists of edge-shared MnO 6 octahedra. The interlayer regi…
A molecular dynamics model for clays and the oxide minerals is desirable for studying the kinetics and thermodynamics of adsorption processes. To this end, a valence force field for aluminous, dioctahedral clay minerals was developed. Novel aspects of this development include the bending potential for octahedral O−Al−…
By focusing on entire gas bubbles, rather than soap films or vertices, a microscopic model was recently developed for the macroscopic deformation and flow of foam in which dimensionality, energy storage, and dissipation mechanisms, polydispersity, and the gas-liquid ratio all can be varied easily [D. J. Durian, Phys.…
The synthesis of CdS and CdSe nanocrystallites using the thermolysis of several dithio- or diselenocarbamato complexes of cadmium in trioctylphosphine oxide (TOPO) is reported. The nanodispersed materials obtained show quantum size effects in their optical spectra and exhibit near band-edge luminescence. The influence…
The ability of organisms to exercise control over crystal growth is wonderfully exemplified by skeleton formation in echinoderms. A sea urchin spine is a unique composite of a single crystal of calcite and glycoproteins intercalated inside the crystal during its growth. Here we performed a detailed morphological and h…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTMonoglyceride Synthesis by Heterogeneous Catalysis Using MCM-41 Type Silicas Functionalized with Amino GroupsAnne Cauvel, Gilbert Renard, and Daniel BrunelView Author Information Laboratoire de Matériaux Catalytiques et Catalyse en Chimie Organique, UMR 5618 CNRS-ENSCM and CPI…
The oxidation of hydrogen-terminated porous silicon surfaces produced by electrochemical etching has been studied using transmission FTIR spectroscopy. The surface is passivated to oxidation by surface hydrogen below about 523 K. Above this temperature as hydrogen depletion occurs by H 2 evolution, Si surface dangling…
Microstructural observations of damage around indentations in Ti 3 SiC 2 are presented. The Vickers hardness decreased with increasing load and asymptotically approached 4 GPa at the highest loads. No indentation cracks were observed even at loads as high as 300 N. Preliminary strength versus indentation plots indicat…
A molecular triad consisting of a diarylporphyrin (P) covalently linked to a carotenoid polyene (C) and a fullerene (C 60 ) has been prepared and studied using time-resolved spectroscopic methods. In 2-methyltetrahydrofuran solution, the triad undergoes photoinduced electron transfer to yield C−P •+ −C 60 •-, which ev…
Abstract Biofibers, natural lignocellulosics, have an outstanding potential as a reinforcement in thermoplastics. This study deals with the preparation of lignocellulosic composites by reactive extrusion processing in which good interfacial adhesion is generated by a combination of fiber modification and matrix modifi…
The rational design, the synthesis via a new convergent approach, and the characterization of four generations of monodendrons based on the AB 3 building block methyl 3,4,5-trishydroxybenzoate are described. The first generation monodendrons are crystalline. The second generation methyl 3,4,5-tris-3‘,4‘,5‘-[tris( n -d…
An attempt was made to prepare porous carbon by using the channels of Y zeolite as a template. Poly(acrylonitrile) and poly(furfuryl alcohol) were carbonized in the zeolite channels and the resultant carbon/zeolite complexes were subjected to acid treatment in order to extract carbon from the zeolite framework. In add…
Abstract Topological considerations concerning the ratio of linear, imperfectly branched, dendritic and terminal units in hyperbranched polymers based on AB 2 , AB 3 and AB m (m≥2) type monomers are summarized. The reaction of AB 2 monomers with a core molecule of the structure B f is also treated. For larger hyperbra…
The electrochemical and optical properties of lithium phosphorous oxynitride (Lipon) thin films have been studied with an emphasis on the stability window vs. lithium metal and the behavior of the Li/Lipon interface. Impedance measurements made between −26 and 140°C show that Lipon exhibits a single, Li + ‐ion conduct…
The thermal effect of a reaction makes the temperature inside the reaction system deviate from a prescribed heating program. To take into account the effect of such temperature deviations on kinetic evaluations, a computational method applicable to an arbitrary variation in temperature has been developed. The method c…
Magnetic coupling constants (2 J ) of hydroxo- and alkoxo-bridged copper binuclear compounds have been evaluated to determine the accuracy of different density functional methods and to study the magnetic behavior of these compounds. Comparison between the calculated and experimental coupling constants for the complet…