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The propagation of indentation radial cracks in soda—lime silicate glass is measured as a function of time after indentation. Rapid lift‐off of the indenter from the specimen surface causes a step‐function perturbation in the radial crack mechanical energy release rate, thus providing access to a large range of observ…
The electro-optic properties of 2-cyclooctylamino-5-nitropyridine and 2-(N-prolinol)-5-nitropyridine single crystals have been evaluated. The dependence of the electro-optic coefficients on the optical wavelength and the frequency of the applied electric field was determined. Enhancements of these coefficients near ac…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTObservation of a noncovalent ribonuclease S-protein/S-peptide complex by electrospray ionization mass spectrometryRachel R. Ogorzalek Loo, David R. Goodlett, Richard D. Smith, and Joseph A. LooCite this: J. Am. Chem. Soc. 1993, 115, 10, 4391–4392Publication Date (Print):May…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInteraction of tetradecyltrimethylammonium bromide with poly(acrylic acid) and poly(methacrylic acid). Effect of charge densityJ. J. Kiefer, P. Somasundaran, and K. P. AnanthapadmanabhanCite this: Langmuir 1993, 9, 5, 1187–1192Publication Date (Print):May 1, 1993Publication…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDesign and evaluation of an echelle grating optical system for ICP-OESThomas W. Barnard, Michael I. Crockett, Juan C. Ivaldi, and Peter L. LundbergCite this: Anal. Chem. 1993, 65, 9, 1225–1230Publication Date (Print):May 1, 1993Publication History Published online1 May 2002P…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThiophene oligomers as polythiophene models. 2. Electrochemistry and in situ ESR of end-capped oligothienyls in the solid state. Evidence for .pi.-dimerization of hexameric polarons in polythiopheneGianni Zotti, Gilberto Schiavon, Anna Berlin, and Giorgio PaganiCite this: Ch…
A numerical study of the stability of the AB 13 crystal structure in a mixture of dissimilar hard spheres is reported. This crystal structure has recently been observed by Bartlett and coworkers in experiments on suspensions of colloidal hard-sphere mixtures. We find that, over a range of densities and diameter ratios…
Protonic conduction of both stoichiometric and nonstoichiometric mixed perovskite ceramics with the general formula A2(B′1+xB″1−x)O6−δ(A=Sr2+, Ba2+; B′=Ga3+, Gd3+, Nd3+; B″=Nb5+,Ta5+; x=0−0.2) has been investigated. The B-site occupancies of B and B can be ordered or disordered depending on the ionic radius of the A i…
Chemical vapor deposition (CVD) of copper from (hfac)copper(I)VTMS, where hfac = hexafluoroacetylacetonato and VTMS = vinyltrimethylsilane has been studied as a function of temperature and pressure. Analogous to other , (hfac)CuVTMS also deposits pure copper films via a quantitative thermally induced disproportionatio…
The effects of pore morphology and grain size on the dielectric behavior of high‐purity stoichiometric BaTiO 3 have been intensively investigated. It was found that the dielectric constant was influenced not only by grain size but also by pore morphology. Dielectric constants below the Curie temperature could be evalu…
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The decomposition of mixed barium titanium oxalates was studied by means of various thermochemical as well as spectroscopic methods. Infrared (IR) spectra of the mixed oxalates indicate the existence of an octahedral complex with Ti chelated by oxalate groups. In general, the results of both IR and the thermochemical…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTControlled photocycloaddition of unsaturated carboxylates intercalated in hydrotalcite clay interlayersKatsuhiko Takagi, Tetsuya Shichi, Hisanao Usami, and Yasuhiko SawakiCite this: J. Am. Chem. Soc. 1993, 115, 10, 4339–4344Publication Date (Print):May 1, 1993Publication His…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFerromagnetic spin alignment in molecular systems: an orbital approachChristian Kollmar and Olivier KahnCite this: Acc. Chem. Res. 1993, 26, 5, 259–265Publication Date (Print):May 1, 1993Publication History Published online1 May 2002Published inissue 1 May 1993https://pubs.a…
Previous studies show that the collagen fibrils of the mammalian vitreous humor are assembled largely from type II collagen with smaller amounts of type IX collagen and either type V or type XI collagen. In this paper, we report the separation of two chains of type V/type XI collagen from type II collagen by heparin-S…
Deposition of carbon nitride thin films on Si(100) and polycrystalline Zr substrates was performed by dc magnetron sputtering of a graphite target under a pure nitrogen ambient. The resulting carbon nitride films (CNx) are primarily amorphous with a small volume fraction of nanocrystallites. Both energy-dispersive x-r…
A binary mixture of hard-sphere polyions and monovalent point counterions is studied using the virial expansion (VEX) of the Ornstein-Zernike equation. The zero-order VEX term, which coincides with the symmetrized Poisson-Boltzmann equation (SPB), exhibits an attraction among polyions at sufficiently high temperatures…
The IR emission of liquid CaO-Al2O3 slags is caused by IR active molecule vibrations of and -complexes. In the liquid CaO-Al2O3 slags the equilibrium dominates. At lower temperatures (1000°C) the formation of condensed -complexes was observed (glassy state). By the addition of B2O3 to CaO-Al2O3 slags B-O-Al associatio…
Abstract The main properties of a new thermoluminescent (TL) material (LiF:Cu,Mg,P) produced in the People's Republic of China under the name of GR-200A have been already investigated by others. The purpose of this work is to establish a standardised procedure for use. Careful experiments were carried out with the aim…
Diffusion of impurities against the direction of gas flow can be a significant source of contamination in the ultrapure gas systems. The mechanism and the kinetics of impurity transport due to back‐diffusion is studied both experimentally and theoretically. A model is developed to simulate the process and calculate th…