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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…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and characterization of branched liquid-crystalline polyethers containing cyclotetraveratrylene-based disk-like mesogensV. Percec, C. G. Cho, C. Pugh, and D. TomazosCite this: Macromolecules 1992, 25, 3, 1164–1176Publication Date (Print):February 1, 1992Publication…
The electrodeposition of palladium particles at electronically insulating polyaniline and conducting polypyrrole films in aqueous solution has been investigated. The number density of particles and their overall surface area was calculated from current transients recorded during deposition at constant potential. Both…
Abstract 35 Cl, 81 Br, 121 Sb, and 209 Bi NQR of the title compounds was observed. According to the results of the temperature dependences of NQR frequencies and the DTA measurements, phase transitions take place in [N(CH 3 ) 4 ] 3 Bi 2 Br 9 (T tr =183K), [N(CH 3 ) 4 ] 3 Bi 2 Cl 9 (T tr = 155K), and (CH 3 NH 3 ) 3 Bi…
Abstract Monodisperse porous styrene‐divinylbenzene copolymer particles were prepared via seeded emulsion polymerization using a mixture of linear polymer (polystyrene seed) and non‐solvent as inert diluent. Experimental evidence was presented to describe the mechanism of formation of porous polymer particles during t…
The temperature and concentration distributions of hydrogen in a hot-filament chemical-vapor deposition reactor of diamond have been measured simultaneously by coherent anti-Stokes Raman scattering (CARS). The bright background from the filament was rejected by using CARS and gating on the detector as well as spatial…
<div class="htmlview paragraph">This paper reports on research and development work conducted at AVL to determine the NO<sub>x</sub>-reduction potential of in-cylinder charge conditions, fuel injection system parameters, exhaust gas recirculation, fuel formulation, and exhaust gas aftertreatment by c…
Dynamic-light-scattering experiments on semidilute aqueous solutions of gelatin indicate three relaxation processes: an exponential for times less than \ensuremath{\sim}50 \ensuremath{\mu}sec followed by a power law at intermediate time and then a stretched exponential at long time. The characteristic time of the stre…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTuning the intermolecular dative interactions in vanadium-oxo linear chain compounds: formation of a new type of liquid crystalline polymerAndre Serrette, Patrick J. Carroll, and Timothy M. SwagerCite this: J. Am. Chem. Soc. 1992, 114, 5, 1887–1889Publication Date (Print):Fe…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEnergetics of surface reactions on (100) diamond planeDaoyang Huang and Michael FrenklachCite this: J. Phys. Chem. 1992, 96, 4, 1868–1875Publication Date (Print):February 1, 1992Publication History Published online1 May 2002Published inissue 1 February 1992https://pubs.acs.o…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRelative basicities of the oxygen sites in [V10O28]6-. An analysis of the ab initio determined distributions of the electrostatic potential and of the Laplacian of charge densityJean Yves Kempf, Marie Madeleine Rohmer, Josep Maria Poblet, Carles Bo, and Marc BenardCite this:…
The stability of uniaxial nematic-liquid-crystalline structures in supra-\ensuremath{\mu}m-size spherical cavities that impose a weak homeotropic anchoring is studied theoretically. The equilibrium equations are obtained with the minimization of the deformation, surface, and field contributions to the free energy and…
High-resolution electron-microscopy experiments are combined with computer simulations of tilt grain boundaries (GBs) in Au to investigate the preferred GB planes in ∑ = 9 and ∑ = 11 bicrystals. The energies calculated for a variety of symmetric and asymmetric GBs suggest that asymmetric GB-plane orientations are ofte…
Abstract Complex X-ray diffraction (XRD) profiles are described crystallographically by simulating XRD peaks for each phase, and adding the various elementary patterns to fit the experimental X-ray pattern. X-ray patterns of a ground muscovite and three polyphasic diagenetic I/S samples are fitted with this powerful,…
Catalysis research underpins the science of modem chemical processing and fuel technologies. Catalysis is one of the most important technologies commercially in national economies. Solid-state heterogeneous catalyst materials such as metal oxides or metal particles on ceramic oxide substrates are most common. They are…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAsymmetric epoxidation of olefins catalyzed by manganese complexes of chiral "strapped" porphyrins with diastereotopic faces. A novel strategy for stereochemical modeling of the active site of cytochrome P-450Katsuaki Konishi, Kenichiro Oda, Kei Nishida, Takuzo Aida, and Sho…
The reaction of La 1‐ x Ca x MnO 3 ( x = 0, 0.1, 0.2) with ZrO 2 ‐8 mol% Y 2 O 3 (YSZ) has been investigated at temperatures ranging from 1300° to 1425°C in air. Substitution of Ca for La in LaMnO 3 depresses the reactivity with YSZ. A layer of La 2 Zr 2 O 7 is formed at the La 1‐ x Ca x MnO 3 /YSZ interface after an…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInteraction of hydrophobically modified hydroxyethyl cellulose with various added surfactantsR. Tanaka, J. Meadows, P. A. Williams, and G. O. PhillipsCite this: Macromolecules 1992, 25, 4, 1304–1310Publication Date (Print):February 1, 1992Publication History Published online…
The systematic study of band-edge luminescence in pseudomorphic Si/Si1−xGex/Si double-heterostructure layers is reported for a wide composition range, 0.12&lt;x&lt;0.24, for the first time. An analytical expression for the exciton energy gap at 4.2 K valid for x&lt;0.24 is derived from the no-phonon line e…