Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCross-conjugated and pseudo-cross-conjugated mesomeric betaines. 1. Synthesis and characterizationKevin T. Potts, Peter M. Murphy, and William R. KuehnlingCite this: J. Org. Chem. 1988, 53, 13, 2889–2898Publication Date (Print):June 1, 1988Publication History Published onlin…
The problem of evaluating the time-to-failure percentiles in progressively-censored tests on solid insulating materials is addressed. Statistical methods to estimate the parameters of the Weibull distribution (and their confidence limits) are examined on the basis of the results of aging with combined thermal-electric…
1. Introduction. In the van der Waals/Cahn-Hilliard theory ([20], We shall consider this theory, but only with a relatively simple dependence on Vu, and only as restricted to isothermal situations; precisely, we shall allow for a free-energy (per unit volume) of the form
Abstract It has been shown that butadiene initiated with potassium naphthalene in the mixture THF‐ n ‐hexane polymerizes conveniently rapidly. The active center is sufficiently stable below 0°C to produce narrow molecular weight linear polybutadiene. The two‐ended living polymer has also served to prepare ring polybut…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermoreversible gelation of isotactic polystyrene: thermodynamics and phase diagramsJean Michel Guenet and Gregory B. McKennaCite this: Macromolecules 1988, 21, 6, 1752–1756Publication Date (Print):June 1, 1988Publication History Published online1 May 2002Published inissue…
Deep level transient spectroscopy measurements were performed to study the annealing-induced changes in trap centers in ZnO varistors and to shed more light on varistor stability mechanism. Two electron traps, Ec-0.26 eV and Ec-(0.2–0.3) eV, were observed in the unannealed samples in large quantities (7–9×1014 cm−3).…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAnisotropic exchange in the cobalt-cobalt and cobalt-copper dinuclear EDTA hydrate (Co2(EDTA).cntdot.6H2O, CoCu(EDTA).cntdot.6H2O) bimetallic ordered chains. Low temperature investigation of the thermal and magnetic propertiesE. Coronado, M. Drillon, P. R. Nugteren, L. J. De…
A double many-body expansion potential energy surface reported previously for H02(R2A”) and referred to here as DMBE \nI is modified to produce thermal rate coefficients for the reaction 0 + OH - O2 + H in good agreement with experiment. \nThis new potential energy surface will be referred to as DMBE 11. By th…
We report an analysis of the excited-state dynamics, fluorescence, as well as excited-state absorption, in the ${\mathrm{Ni}}^{2+}$-doped vibronic laser systems MgO:${\mathrm{Ni}}^{2+}$ and ${\mathrm{MgF}}_{2}$:${\mathrm{Ni}}^{2+}$. Use is made of this analysis to show the ability and the limitations of the single-con…
Data for as-grown and partially oxidized samples of Ti:Al/sub 2/O/sub 3/ grown by the vertical-gradient-freeze technique show that the residual infrared absorption in these samples is largely due to Ti/sup 3+/-Ti/sup 4+/ pairs. In agreement with this pair model, the residual absorption in as-grown samples has been sub…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhosphorescence spectra of bacteriochlorophyllsLarry. Takiff and Steven G. BoxerCite this: J. Am. Chem. Soc. 1988, 110, 13, 4425–4426Publication Date (Print):June 1, 1988Publication History Published online1 May 2002Published inissue 1 June 1988https://pubs.acs.org/doi/10.10…
This paper reports a model for the relationship between critical debonding pressures and the work of adhesion of thin films in the blister test. Previous models have neglected the possible role of residual stresses in the film on the critical pressure. The model reported here shows that these stresses may have a large…
The effects of grooved epoxy substrata on epithelial (E) cell behavior were studied in vitro and in vivo. V-shaped grooves, 10 microns deep, were produced in silicon wafers by micromachining, a process which was developed for the fabrication of microelectronic components. The grooved substrata were replicated in epoxy…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal, mechanical, and morphological analyses of poly(2,6-dimethyl-1,4-phenylene oxide)/styrene-butadiene-styrene copolymer blendsP. S. Tucker, J. W. Barlow, and D. R. PaulCite this: Macromolecules 1988, 21, 6, 1678–1685Publication Date (Print):June 1, 1988Publication Hist…
Results are presented of the equilibrium forces between two molecularly smooth surfaces immersed in pure monodisperse polymer liquids or ‘‘melts’’: liquid polybutadienes of molecular weights ∼1000 and ∼3500, corresponding to n≈20 and n≈65 segments (monomer units) per molecule, respectively. The aims were (i) to establ…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMetal complexes with tetrapyrrole ligands. 50. Redox potentials of sandwichlike metal bis(octaethylporphyrinates) and their correlation with ring-ring distancesJohann W. Buchler and Bernd. ScharbertCite this: J. Am. Chem. Soc. 1988, 110, 13, 4272–4276Publication Date (Print)…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNew crystalline phase of (octaethylporphinato)nickel(II): effects of .pi.-.pi. interactions on molecular structure and resonance Raman spectraTheodore D. Brennan, W. Robert. Scheidt, and John A. ShelnuttCite this: J. Am. Chem. Soc. 1988, 110, 12, 3919–3924Publication Date (P…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOxygen-17 nuclear magnetic resonance kinetic study of water exchange on the lanthanide(III) aqua ionsCedric Cossy, Lothar Helm, and Andre E. MerbachCite this: Inorg. Chem. 1988, 27, 11, 1973–1979Publication Date (Print):June 1, 1988Publication History Published online1 May 2…
Chloramphenicol acetyltransferase [acetyl-CoA:chloramphenicol O3-acetyltransferase; EC 2.3.1.28] is the enzyme responsible for high-level bacterial resistance to the antibiotic chloramphenicol. It catalyzes the transfer of an acetyl group from acetyl CoA to the primary hydroxyl of chloramphenicol. The x-ray crystallog…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotophysics of metal complexes of spheroidal carbon shellsF. D. Weiss, J. L. Elkind, S. C. O'Brien, R. F. Curl, and R. E. SmalleyCite this: J. Am. Chem. Soc. 1988, 110, 13, 4464–4465Publication Date (Print):June 1, 1988Publication History Published online1 May 2002Published…