Materials Literature
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A novel chemical reaction to minimize termination reactions in radical polymerization is applied for the first time to the growth of thin polymer films on silica. A living polyacrylamide thin film is grown from a self-assembled benzyl chloride monolayer on silica gel using Cu(bpy) 2 Cl to control the radical populatio…
Nanocrystalline diamond films have been synthesized by microwave plasma enhanced chemical vapor deposition using N2/CH4 as the reactant gas without additional H2. The nanocrystalline diamond phase has been identified by x-ray diffraction and transmission electron microscopy analyses. High resolution secondary ion mass…
We have used x-ray scattering to measure the structure of the passive oxide film formed at high anodic potentials on Fe(110) and Fe(001). The crystalline film has a small crystallite size ( $\ensuremath{\approx}50\AA{}$) and is oriented with the substrate. The film structure is based on ${\mathrm{Fe}}_{3}{\mathrm{O}}_…
Zeolites were used as templates to prepare microporous polymer replicas. Phenol−formaldehyde polymers were synthesized and cured within the channel networks of zeolites Y, β, and L. Dissolution of the aluminosilicate framework in aqueous HF yields an organic replica that contains <2% aluminosilicate. The zeolite templ…
We predict in Si/Ge superlattices a dramatic high-temperature suppression of the perpendicular thermal transport. Total internal reflection confines the superlattice modes and significantly reduces the average group velocity at nonzero in-plane momenta. These consequences of the acoustic mismatch cause at high tempera…
Water:ethanol solvent mixtures of differing polarity have been used to tailor the framework and textural mesopores of HMS molecular sieve silicas through an electrically neutral (S°I°) assembly pathway (S° = dodecyl- or tetradecylamine; I° = tetraethyl orthosilicate). Mesostructure assembly from a water-rich solvent m…
Primary and secondary radiation forces result from pressure gradients in the incident and scattered ultrasonic fields. These forces and their dependence on experimental parameters are described, and the theory for primary radiation force is extended to consider a pulsed traveling wave. Both primary and secondary radia…
The compounds Cs 12 [V IV 18 O 42 (H 2 O)]·14H 2 O ( 1a ), K 12 [V IV 18 O 42 (H 2 O)]·16H 2 O ( 1b ), Rb 12 [V IV 18 O 42 (H 2 O)]·19H 2 O ( 1c ), K 9 [H 3 V IV 18 O 42 (H 2 O)]·14H 2 O·4N 2 H 4 ( 1d ), K 11 [H 2 V IV 18 O 42 (Cl)]·13H 2 O·2N 2 H 4 ( 2a ), K 9 [H 4 V IV 18 O 42 (Br)]·14H 2 O·4N 2 H 4 ( 2b ), K 9 [H 4…
The molecular weight distribution (MWD) and its moments are calculated for hyperbranched polymers formed by self-condensing vinyl polymerization (SCVP) of monomers (“inimers”) with the general structure AB*, where A is a vinyl group and B* is an initiating group. The calculated MWD is extremely broad, the polydispersi…
Electrostriction is the basis of electromechanical coupling in all insulators. The quadratic electrostrictive strain x ij associated with induced polarization components P k and P l is given by x ij = Q ijkl P k P l . Two converse electrostrictive effects may also be defined. In this paper, some trends in structure−pr…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTWide Thermal Hysteresis for the Mononuclear Spin-Crossover Compound cis-Bis(thiocyanato)bis[N-(2'-pyridylmethylene)-4-(phenylethynyl)anilino]iron(II)Jean-François Létard, Philippe Guionneau, Epiphane Codjovi, Olivier Lavastre, Georges Bravic, Daniel Chasseau, and Olivi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleOxidation of Pollutants Catalyzed by MetallophthalocyaninesBernard Meunier and Alexander SorokinView Author Information Laboratoire de Chimie de Coordination du CNRS, 205 route de Narbonne, 31077 Toulouse, Cedex 4, France Cite this: Acc. Chem. Res. 1997, 30, 11, 470–476Publicati…
We describe the numerical procedure for calculating three-dimensional profiles of temperature in a multilayer stack illuminated by a laser beam, and model the crystallization and amorphization kinetics for phase-change rewritable media. Experimental methods have been used to determine indirectly the probabilities of n…
Many organisms contain proteins which regulate the size and shape of inorganic crystals in their skeletal elements, most likely through specific protein−crystal surface interactions. As a model for better understanding such control of crystal morphology, an α-helical peptide (CBP1) was synthesized having an array of a…
Although several dextran-coated iron oxide preparations are in preclinical and clinical use, little is known about the mechanism of uptake into cells. As these particles have been shown to accumulate in macrophages and tumor cells, we performed cellular uptake and inhibition studies with a prototypical monocrystalline…
The reversible kinetics of l -lactide bulk polymerization with tin(II) ethylhexanoate was determined over a wide range of temperatures, 130−220 °C, and monomer to initiator molar ratios, 1000−80 000. Both polymerization and depolymerization are accurately described by a reversible model with a propagation term that is…
Optical microscopy, neutron reflectivity, and small angle neutron scattering studies were used to investigate the structure of thin films of symmetric diblock copolymers of P(dS- b -MMA) as the interactions between the copolymer and the substrate were changed in a systematic manner. In cases where there was a strong p…
We have succeeded in controlling the saturation magnetization ${(I}_{S}),$ the Weiss temperature (\ensuremath{\theta}), and the coercive field ${(H}_{c})$ using compounds in the series $({\mathrm{Ni}}_{x}^{\mathrm{II}}{\mathrm{Mn}}_{1\ensuremath{-}x}^{\mathrm{II}}{)}_{1.5}{[\mathrm{Cr}}^{\mathrm{III}}(\mathrm{C}\mathr…
Titania−silica mixed oxides are intriguing catalysts and catalyst supports since their surface reactivities depend strongly on composition and homogeneity of mixing. In this review, the synthesis, characterization, and catalytic activity of titania−silica are described, and important structure/property relationships f…
The lamellar compound ${\mathrm{CuInP}}_{2}{\mathrm{S}}_{6}$ is presented as an unusual example of a collinear, two-sublattice ferrielectric system. Single-crystal x-ray diffraction is used to study the thermal evolution of the polar character of its structure. The results are consistent with the occurrence of a first…