Materials Literature
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Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation M. Moan, J. Huitric, P. Médéric, J. Jarrin; Rheological properties and reactive compatibilization…
Polyaniline/Na+-montmorillonite (Na+-MMT) nanocomposites synthesized by in-situ intercalative polymerization of aniline into Na+-MMT are reported. The expansion distribution of basal spacing of the silicate layers upon the increase of the amount of aniline relative to Na+-MMT is, for the first time, estimated from the…
Single crystals of LiMn2O4 have been successfully synthesized for the first time. The single-crystal X-ray diffraction study confirmed the cubic spinel structure at 297 K. The structural phase transition around 285 K on the cooling process was confirmed by the single-crystal X-ray reciprocal space mapping method. Evid…
We demonstrate a quantum-dot microcavity by coupling core-shell semiconductor nanocrystals to a fused-silica microsphere. We show that the composite microcavity can feature Q factors of the order of 10(8), providing a model system for investigating cavity QED and microlasers at the level of single quantum dots.
ZnO thin films were epitaxially grown on α-Al2O3 (0001) single-crystal substrates by rf magnetron sputtering. The films were grown at substrate temperatures of 550–600 °C for 1 h at a rf power of 60–120 W and Ar/O2 ratios of 1–4. The crystalline structure of the ZnO films was analyzed by four-circle x-ray diffraction…
Polylactide samples obtained by the ring-opening polymerization of (D,L)-lactide by using different lanthanide alkoxide initiators were examined by SEC, 13C NMR and MALDI-TOF MS techniques. The evidence of substantial transesterification was observed in the case of a polymerization initiated by lanthanum alkoxide and…
The effect of TiO 2 /SiO 2 addition on the grain growth of alumina was reinvestigated. TiO 2 promoted the grain growth, but there was no abnormal grain growth. However, codoping of TiO 2 and SiO 2 resulted in a duplex microstructure consisting of large platelike grains, ∼800 μm long and ∼100 μm thick, and fine matrix…
Ferroelectric Ba0.4Sr0.6TiO3 (BST) thin films grown on (001) MgO by pulsed laser deposition show a strong correlation between their structure and their microwave dielectric properties. Epitaxially grown BST films are observed by x-ray diffraction to be tetragonally distorted. The oxygen deposition pressure affects the…
We have synthesized a series of monolayer-protected gold clusters (gold MPCs) featuring amide functionality within the monolayer chains. Spectroscopic investigation of these MPCs using IR and 1 H NMR spectroscopy reveal that intra monolayer hydrogen bonding is highly dependent on the distance of the amide from the nan…
The degree of reversibility of crystallization and melting of poly(ethylene- co -1-octene) containing 7.3 mol % (24 mass %) of 1-octene was measured with temperature-modulated differential scanning calorimetry. The sample was crystallized at different cooling rates after excluding self-nuclei of the crystals. The samp…
ADVERTISEMENT RETURN TO ISSUEPREVFeaturesNEXTPeer Reviewed: Sol–Gels and Electrochemistry: Research at the Intersection.Sol–gel's intriguing chemistry, coupled with the ease with which these materials can be made and processed, has attracted the interest of chemists, engineers, physicists, and materials scientistsMary…
Experiments have been carried out on a commercial aluminium alloy rolled to foils with various high rolling reductions. Attention was focused on the formation of cells during deformation. Microstructures were examined in the SEM using electron backscatter diffraction (EBSD) and oriented imaging microscopy techniques.…
Phase diagram studies show that at ambient pressure only one ternary oxide, Cu 2 Ln 2 O s , is stable in the ternary systems Cu-Ln-O (Ln = Tb, Dy, Ho, Er, Tm, Yb, Lu) at high temperatures. The crystal structure of Cu 2 Z,rc 2 0 5 can be described as a zig-zag arrangement of one-dimensional Cu 2 O s chains parallel to…
The near-surface atomic composition and the character of chemical bond in two nonevaporable gettering alloys have been investigated via core level (Zr 3d, Fe 2p, V 2p, O 1s, C 1s) photoemission. The samples have been measured in UHV after in-air fracturing and various annealing steps (up to 850 °C). For T>400 °…
The properties of two types of surface OH species, terminal (t) and bridged (b), as well as corresponding vacant sites on ZrO 2 at 573 K have been studied using dimethyl ether (DME) adsorption as an IR molecular probe. On the dehydroxylated ZrO 2 surface, the molecularly adsorbed CH 3 OCH 3 species was dissociated mod…
A eutectic solid of Al 2 O 3 –GdAlO 3 was prepared by arc discharge and crushed to a eutectic powder of 3–125 μm. The powder was consolidated by the spark plasma system (SPS). The consolidated powder duplicated the eutectic structure: Al 2 O 3 and GdAlO 3 were joined to each crystal. There were no flaws such as cracks…
Summary Sulfate scale dissolvers have been applied downhole for many years to remove barium and mixed sulfate scale deposits from the wellbore and from the near-wellbore formation. As well as dissolving mineral scales, these corrosive materials also have the potential to cause some degree of formation damage by the di…
Abstract Adduct complexes of ruthenium(II,III) pivalate dimer with pyridyl nitronyl nitroxide radicals, [Ru2(O2CCMe3)4(L)2]X (L = 2-(3-pyridyl)-4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazolyl-1-oxyl 3-N-oxide (m-nitpy) and 2-(4-pyridyl)-4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazolyl-1-oxyl 3-N-oxide (p-nitpy); X = BF4 an…
The thermal expansion of Al 2 O 3 –MgO castables containing 5.5 wt% MgO and 1.36 wt% CaO and Al 2 O 3 –spinel castables containing 20 wt% spinel having 95 wt% Al 2 O 3 and 1.7 wt% CaO was measured in the temperature range of 800–1650°C by dilatometry. A sharp increase in expansion from around 1425° to 1525°C, followed…
Abstract Block copolymers of polycarbonate (PC) and polymethylmethacrylate (PMMA), PCb‐PMMA, were examined as compatibilizers for blends of PC with styrene‐co‐acrylonitrile (SAN) copolymer. PC‐b‐PMMA was added to blends of PC with SAN containing various amounts of AN. The average diameter of the dispersed particles wa…