Materials Literature
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Microstructural changes caused by doping α‐Al 2 O 3 with small amounts of SiO 2 and TiO 2 added singly or together were investigated. When they were sintered at 1450°C for 120 min, singly doped samples developed equiaxed microstructures, but codoped material developed an anisotropic microstructure that contained plate…
The depolymerization of poly(ethylene terephthalate) (PET) by alcoholysis reaction is an easy operation and gives prospects for the valorization of wastes. PET waste was first depolymerized by glycolysis reaction at different molar ratios of diethylene glycol (DEG), in the presence of Mn acetate as a transesterificati…
The etching of various xerogel films has been studied in high-density fluorocarbon plasmas. The xerogel etch rate is in part enhanced by the porosity. In discharges resulting in low surface polymerization, such as CF4 or oxygen-rich fluorocarbon plasmas, an additional enhancement up to 60% is observed. When the polyme…
Exposure of metallic materials to carbonaceous gases can lead to (i) carburization, i.e. internal carbide formation causing embrittlement and failure especially at high temperatures of cracking tubes for olefine production, (ii) metal dusting, a disintegration of metals to a dust of carbon and fine metal particles, oc…
The pyridoxal 5'-phosphate (PLP)-dependent enzyme 1-aminocyclopropane-1-carboxylate deaminase (ACCD) catalyzes a reaction that involves a ring opening of cyclopropanoid amino acid, yielding alpha-ketobutyrate and ammonia. Unlike other PLP-dependent enzymes, this enzyme has no alpha-hydrogen atom in the substrate. Thus…
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…