Materials Literature
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This paper addresses the development of an image analysis technique using the Fourier transform of the image to evaluate orientation in a fibrous assembly. The algorithms are evaluated using simulated images presented in Part I of the series. The results are compared with those for the tracking method presented in Par…
The crystal structure of the perovskite lead zirconate PbZrO 3 has been redetermined using single-crystal X-ray diffraction (Mo K α radiation, λ = 0.71069 Å). Single-crystal data at 100 K: space group. Pbam , a = 5.884 (1), b = 11.787 (3), c = 8.231 (2) Å, V = 570.85 Å 3 with Z = 8, μ = 612.6 cm −1 , D x = 8.06 Mg m −…
The orientation distribution of a textured polycrystal has been traditionally determined from a few individual pole figures of lattice planes hkl , measured by X-ray or neutron diffraction. A new method is demonstrated that uses the whole diffraction spectrum, rather than extracted peak intensities, by combining ODF c…
We have studied the aggregation behavior of polyethylene−poly(ethylenepropylene) (PE−PEP) diblock copolymers dissolved in decane. For this purpose PE−PEP diblock copolymers of various molecular weights, compositions, and degrees of deuteration were synthesized via an anionic route. The structure and morphology of the…
This study examines the use of spin‐applied conjugated polymers such as polyanilines for corrosion and dissolution protection of silver and copper. In particular, attention is given to the protection that these polymers provide under conditions of an applied potential and at elevated temperature. These particular cond…
Photoproduct distribution in films of cinnamate polymers was analyzed to reveal the contribution of both photoisomerization and photodimerization to LC alignment photoregulation. A polymethacrylate with o -cinnamate side chains displayed preferential formation of Z -isomer while the dimerization takes place more favor…
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…