Materials Literature
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The electrical conductivity of high‐purity single‐crystal alumina is determined in a temperature range from 400° to 1300°C. By applying an advanced fully guarded threeterminal measurement technique, reliable conductivity measurements are performed to as low as 10 −17 Ω −1 · cm −1 . Gas and surface conduction are measu…
We investigate the current status of the mode-coupling theory (MCT) of the glass transition by making a comparison with two recent sets of experiments: the scaling data resulting from the dielectric measurements of Dixon et et al. et al. [Phys. Rev. Lett. 65, 1108 (1990)] and the neutron-scattering data. Our main conc…
In recent years, we have been reporting our research on composite yarns of mostly cotton content produced on a modified ring spinning system. Recently, we reported an improved method of producing an all staple-core spun yarn, and we have applied the same method to filament-core spinning, obtaining a yarn of greatly im…
Abstract Some aspects of batch cooling crystallization in the industrial practice are analysed by computer simulations. The results indicate that without appropriate kinetics and very accurate process control, even the qualitative effects of applying controlled cooling and seeding are highly unpredictable. An increase…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTemperature-programmed reduction of silica-supported platinum/nickel catalysts studied by XANESAndreas Jentys, Brian J. McHugh, Gary L. Haller, and Johannes A. LercherCite this: J. Phys. Chem. 1992, 96, 3, 1324–1328Publication Date (Print):February 1, 1992Publication History…
Abstract K4Nb6O17 is a layered material with two different types of interlayer spaces, interlayer I and interlayer II. It was found that two types of intercalation compounds of K4Nb6O17 with alkylammonium ions were formed, one in which alkylammonium ions were present in interlayer I only, and the other in which they w…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSide-chain liquid-crystalline copolymers containing spacers of differing lengthsCorrie T. Imrie, Frank E. Karasz, and George S. AttardCite this: Macromolecules 1992, 25, 4, 1278–1283Publication Date (Print):February 1, 1992Publication History Published online1 May 2002Publis…
The interfacial profile of the isotropic-nematic interface of a rigid-rod system is solved numerically based on a generalized Onsager model. For long rigid rods, the surface tension has the lowest value at a \ensuremath{\pi}/2 tilt angle between the nematic director and the normal to the interface. The density and ord…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and physical properties of soluble, amorphous poly(ether ketone)s containing the o-dibenzoylbenzene moietyRina Singh and Allan S. HayCite this: Macromolecules 1992, 25, 3, 1017–1024Publication Date (Print):February 1, 1992Publication History Published online1 May 2…
Abstract Sediments from depths to 670 m in the Barbados accretionary complex and transecting the décollement zone have been studied by transmission and analytical electron microscopy (TEM/AEM). The sediments consist of claystone and mudstone intercalated with layers of volcanic ash. Smectite comprises the bulk of the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of the exciton coupling on the optical and photophysical properties of face-to-face porphyrin dimer and trimer: a treatment including the solvent stabilization effectT. H. Tran-Thi, J. F. Lipskier, P. Maillard, M. Momenteau, J. M. Lopez-Castillo, and J. P. Jay-GerinCi…
We simulate one-dimensional crystal growth from an undercooled melt using a phase-field model and find interesting behavior when the liquid is undercooled by L/${\mathit{c}}_{\mathit{p}}$ degrees (``unit undercooling''). L is the latent heat and ${\mathit{c}}_{\mathit{p}}$ the specific heat. For smaller undercoolings,…
ADVERTISEMENT RETURN TO ISSUEPREVarticleNEXTFormation and reactivity of (tetraarylporphyrinato)rhodium(II) monocarbonyls: bent RhIICO complexes that react like acyl radicalsBradford B. Wayland, Alan E. Sherry, George Poszmik, and Andrew G. BunnCite this: J. Am. Chem. Soc. 1992, 114, 5, 1673–1681Publication Date (Print…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfrared and Raman studies of poly(p-phenylenevinylene) and its model compoundsAkira Sakamoto, Yukio Furukawa, and Mitsuo TasumiCite this: J. Phys. Chem. 1992, 96, 3, 1490–1494Publication Date (Print):February 1, 1992Publication History Published online1 May 2002Published in…
The frequencies of phonons with energies well above those of corresponding soft modes depend on the evolution of the structural order parameter as a function of temperature, pressure or chemical composition. The relative changes of the phonon frequencies are usually below 2% of their total energies (hence “hard modes”…
<div class="htmlview paragraph">Several methods to reduce ignition delay period were tested in combination with a high pressure injection and effects on combustion improvement were examined.</div> <div class="htmlview paragraph">It was found that the reduction of ignition delay does not give so much…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of poly(dichlorophosphazenes) from Cl3P:NP(O)Cl2. 1. Kinetics and reaction mechanismG. D'Halluin, R. De Jaeger, J. P. Chambrette, and P. PotinCite this: Macromolecules 1992, 25, 4, 1254–1258Publication Date (Print):February 1, 1992Publication History Published onli…
<div class="htmlview paragraph">An experimental data base of catalyst conversion efficiency was generated, using a tubular flow reactor which contained either a Pt/Rh (5:1; 40g/ft<sup>3</sup>) or a Pd/Rh (5:1; 40g/ft<sup>3</sup>) catalyst sample, for the purpose of updating the kinetic ra…
Various methods to measure fracture toughness using in‐dentation precracks were compared using soda‐lime glass as a test material. In situ measurements of crack size as a function of applied stress allow both the toughness K c and the residual‐stress factor χ to be independently determined. Analysis of the data showed…
In contrast to m-xylylene and related diradicals, bisnitroxide 1 has a singlet ground state according to ESR spectroscopic investigations. Diradical 1 can be isolated as two stable atropoisomers. In both, the free electron is possibly localized on the oxygen atom, because conjugation is prevented by the steric hindran…