Materials Literature
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Abstract The morphology of melt‐crystallized poly(ethylene succinate) (PES) was investigated by optical microscopy and scanning electron microscopy, and the melting behaviour of PES was studied by differential scanning calorimetry (DSC). At low crystallization temperature imperfect crystals were formed which could mel…
Abstract In order to explore the effects of chemical composition on the rheological behavior o filled polymeric systems, we prepared polystyrene (9PS) and poly(methyl methacrylate) (PMMA) particles crosslinked with either ethylene glycol dimethacrylate (EGDMA) or divinyl benzene (DVB), and mixed these particles in a P…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe AlO + O2 Reaction System over a Wide Temperature RangeDavid P. Belyung and Arthur FontijnCite this: J. Phys. Chem. 1995, 99, 32, 12225–12230Publication Date (Print):August 1, 1995Publication History Published online1 May 2002Published inissue 1 August 1995https://pubs.ac…
We have observed the origin of defects in SiO2 thermally grown on Czochralski silicon substrates. Samples were prepared by copper decoration to locate oxide defects, focused ion beam etching to mark them, and subsequent silicon-substrate thinning for transmission electron microscope observation. Polyhedron structures…
Abstract In general, the N 2 -BET surface areas of sepiolite samples range from 95 to 400 m 2 / g depending on deposits. The surface areas of five sepiolites, all varying in crystallite size, were measured on heating, and were compared with a model calculation. A sharp decrease in the surface area, due to crystal fold…
Measurements of the residual stresses in Al 2 O 3 /Ce‐TZP (12 mol% CeO 2 ) sintered composites, containing 10, 20, and 40 vol% zirconia, obtained by neutron diffraction and by piezospectroscopy using optical fluorescence and Raman are compared. The techniques give essentially the same values for the spatial average of…
Unprinted, unsized, and sized security papers (SP) were treated under SiCl4−, O2−, and CF4-cold plasma conditions. The plasma treatments were carried out in a stainless steel, parallel plate RF (30 kHz) reactor. The influence of plasma parameters, such as RF power, pressure, and treatment time, on the surface properti…
One of the possible uses for a conductive paste is as an adhesive in interconnect technology that could replace solder. The interconnections are expected to perform under a variety of environmental conditions, and with an applied voltage. Thus knowledge of their corrosion and dissolution resistance is of utmost import…
Abstract For the first time perthioborates with trigonal planar coordination of boron were prepared. Na 2 B 2 S 5 (Pnma, a = 12.545(2) Å, b = 7.441(1) Å, c = 8.271(1) Å, Z = 4) and Li 2 B 2 S 5 (Cmcm, a = 15.864(1) Å, b = 6.433(1) Å, c = 6.862(1) Å, Z = 4) were obtained by reaction of the metal sulfides with stoichiom…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInteraction of Poly(.alpha.,.beta.-aspartate) with Octadecylamine Monolayers: Adsorption Behavior and Effects on CaCO3 CrystallizationJon M. Didymus, Stephen Mann, William J. Benton, and Ian R. CollinsCite this: Langmuir 1995, 11, 8, 3130–3136Publication Date (Print):August…
Electron microscopy of lead zirconate (PbZrO 3 ) identified the presence of an intermediate region between the high‐temperature cubic state and the low‐temperature antiferro‐electric state. Ferroelectric domains were found to occur between 200° and 230°C on cooling. Convergent‐beam electron diffraction studies identif…
We present the results of a lattice-dynamical treatment of the 3C, 2H, 4H, and 6H structures of SiC, performed within the framework of an unified approach. This includes (i) a simple valence force field, whose parameters were in part derived from the quantum-mechanical calculations of the appropriate molecule, in part…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBis(trifluoromethanesulfonato)(tetra-p-tolylporphyrinato)silicon(IV), (TTP)Si(OTf)2: The First Structurally Characterized (Porphyrinato)silicon(IV) ComplexKevin M. Kane, Frederick R. Lemke, and Jeffrey L. PetersenCite this: Inorg. Chem. 1995, 34, 16, 4085–4091Publication Dat…
A statistical dynamical theory of the crossover from unentangled Rouse dynamics to entangled behavior is constructed for chain polymer solutions and melts. Both time and spatial crossovers in long chain fluids, and the degree of polymerization crossover for short polymers, are treated. The analysis is based on a micro…
SUMMARY Least‐squares fitting methods are described, currently the most accurate known, for determining the imaging aberrations and other important parameters. The data required are either the image displacement or the image diffractogram shape (or both), as a function of injected beam tilt; the analysis is largely co…
Presently two well established cooling techniques prevail in crystallography: cold nitrogen-gas-stream cooling, which allows a minimum temperature close to the boiling point of nitrogen, 77 K, and closed-cycle helium refrigeration, which can reach temperatures even below 10 K. Some advantages and disadvantages of the…
A link between metal vacancy sites and magnetic ordering in the ion exchange intercalates of MnPS 3 has been established. High‐temperature X‐ray pattersn show that the formation of a metal vacancy superstructure and the transition to the magnetically ordered state are intimately linked, providing strong evidence that…
The [5, 10, 15,20-tetrakis((pentaammineruthenio(II))-4-pyridylporphinato ]cobalt(II) complex that catalyzes the fourelectron reduction of O_2 at graphite electrode surfaces on which it has been assembled has now been prepared in homogeneous solution. The preparative procedure for the catalyst is described, and the kin…
Surface‐oxidized phases on α‐silicon nitride, β‐silicon nitride, and silicon oxynitride powders were investigated by X‐ray photoelectron spectroscopy (XPS) and X‐ray Auger electron spectroscopy (XAES). The spectra of Si2 p XPS and Si( KLL ) XAES were measured precisely and were deconvoluted into some separate peaks, w…
The fabrication and crystallization of stoichiometric and near‐stoichiometric celsian, BaAl 2 Si 2 O 8 (BAS), glass made via melt and sol‐gel routes is reviewed. After considering celsian polymorphism and methods of stabilizing monoclinic celsian, some new experimental results are presented which show that melt glass…