Materials Literature
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Epitaxial growth of thiophene/phenylene co-oligomers(e.g., see Figure) on uniaxially oriented poly(p-phenylene) (PPP) is reported. The emission properties of these co-oligomer thin films are investigated and compared to those of films grown on quartz. Color-tunable emission highly polarized along the direction of orie…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTA Highly Selective, One-Pot Multiple-Addition Convergent Synthesis of Polycarbonate DendrimersSteve P. Rannard and Nicola J. DavisView Author Information Courtaulds Corporate Technology, Coatings and Sealants P.O. Box 111, Lockhurst Lane, Coventry, CV6 5RS, UK Cite thi…
A technique to create templates for nanofabrication using thin films of diblock copolymers is discussed and demonstrated. Advanced lithographic techniques are used to create chemically patterned surfaces that manipulate the wetting behavior of diblock copolymer films and to guide the spatial microphase separation of t…
High resolution electron backscattered diffraction analysis has been used to compare the evolution of the deformed state during severe deformation of two model materials: an Al–0.13 wt-%Mg alloy and an interstitial free steel. The alloys were deformed by equal channel angular extrusion up to a total effective strain o…
Metastable impact electron spectroscopy (MIES) and ultraviolet photoelectron spectroscopy are used in this study to investigate low-defect and defective MgO(100) thin films. Unlike low-defect films, defective films exhibit a new spectroscopic feature located ∼2 eV above the top of valence band. Exposing the defective…
This paper reports the synthesis, crystal structures, and magnetic properties of two copper(II) complexes (1, 2) of general formula Cu(tfac)2(radical)2 (tfac = trifluoroacetate; radical = (1) 2-phenyl-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide (NITPh) or (2) 2-phenyl-4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazoline-1…
Fourier-transform infrared spectra (FTIR) were recorded on a series of synthetic amphiboles along the join Ca 1.8 Mg 5.2 Si 8 O 22 (OH) 2 -Ca 1.8 (Mg 4.2 Al)(Si 7 Al)O 22 (OH) 2 . The spectra were fitted by up to six component bands by optimization and non-linear least-squares techniques. 27 Al MAS NMR and triple-quan…
BaTiO 3 single crystals were grown via templated grain growth (TGG), which is a process in which a single‐crystal “template” is placed in contact with a sintered polycrystalline matrix and then heated to migrate the single‐crystal boundary into the matrix. Millimeter‐sized, stoichiometric single crystals of BaTiO 3 we…
Using a coarse-grained model of a semiflexible macromolecule, the equilibrium shapes of the chain have been studied varying both the temperature and the chain stiffness. We have applied Monte Carlo techniques using the bond fluctuation model for a chain length of N = 80 effective monomers, and two different types of i…
Electrically rewritable nonvolatile memories using chalcogenide semiconductors were studied. The memory cell size was changed from 0.3 to 1.5 µmφ using a focused ion beam. This material can be used for nonvolatile random access memory. Reversible phase transition between the amorphous and crystalline states, which is…
The luminescence intensity of Mn2+ in the ZnS:Mn nanoclusters formed in an ultrastable zeolite-Y is seven orders of magnitude stronger than that of other nanoparticles deposited out of solutions. This remarkable effect is attributed to a strong quantum size confinement, the location of Mn2+ ions at the near-surface si…
Water-soluble poly(ferrocenylsilane) (PFS) and poly(styrenesulfonate) (PSS) of alternating charge are shown to self-assemble in a layer-by-layer fashion on primed Au, Si, and quartz substrates to create the first examples of organic−organometallic electrostatic superlattices from polymers with ferrocene units in the b…
Mesoporous silica films with low dielectric constants and possibly closed pores have been achieved with a multiple step sol-gel processing technique. Crack-free films with approximately 50 % porosity and 0.9 μm thicknesses were obtained, a tape-test revealing good adhesion between films and substrates or metal electro…
Three reactions are discussed which accomplish a high degree of substitution of the silicon hydride bonds on the porous silicon (pSi) surface with silicon–carbon bonds. Lewis acid mediated (LAM) and white light-promoted (LP) hydrosilylation of alkynes and alkenes gives surfaces with alkenyl and alkyl residues, respect…
This study focuses on the crack healing behavior of three kinds of commercial SiC ceramics. Specimens with and without cracks were subjected to thermal treatment at different temperatures, and their strengths were measured by a three‐point bending test in accordance with JIS standards. The tests were performed in air…
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…