Materials Literature
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The conversion of a solid copolymer (ViSiHNH) x ─(MeSiHNH) y into a ceramic was studied in the 20–1450°C temperature range under different atmospheres (inert or oxidative). The ceramic yield, the ceramic composition, and the gaseous evolution directly depend on the heating rate, the pyrolysis atmosphere, and the durat…
A new technique for inducing a large permanent second-order susceptibility in lead silicate glass is reported. The procedure involves implanting electrons by irradiating the glass with an electron beam. Second-order nonlinearities chi((2)) as high as 0.7 pm/V are obtained.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSimultaneous crystallization of diamond and cubic boron nitride from the graphite relative boron carbide nitride (BC2N) under high pressure/high temperature conditionsTakayoshi Sasaki, Minoru Akaishi, Shinobu Yamaoka, Yoshinori Fujiki, and Tetsuo OikawaCite this: Chem. Mater…
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The electromigration characteristics of electroless plated copper interconnects have been investigated under DC and time-varying current stressing. A scheme for selected electroless Cu plating by using 150-AA Co as the seeding layer is reported. The Cu DC and pulse-DC lifetimes are found to be one and two orders of ma…
The shock wave-induced collapse and jet formation of pre-existing air bubbles at the focus of an extracorporeal shock wave lithotripter is investigated using high-speed photography. The experimentally obtained collapse time, ranging from 1 to 9 μs for bubbles with an initial radius R0 of 0.15 to 1.2 mm, agrees well wi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGrazing incidence x-ray scattering studies of thin films of an aromatic polyimideBradford J. Factor, Thomas P. Russell, and Michael F. ToneyCite this: Macromolecules 1993, 26, 11, 2847–2859Publication Date (Print):May 1, 1993Publication History Published online1 May 2002Publ…
Abstract Mudrock samples from a well penetrating Eocene and Paleocene strata (1235-4455 m) of the Texas Gulf Coast have been studied to assess geochemical redistribution in mudrocks during burial diagenesis, and the mechanism by which detrital smectitic illite/smectite (I/S) is transformed into diagenetic illitic I/S.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDirect observation of the push effect on the oxygen-oxygen bond cleavage of acylperoxoiron(III) porphyrin complexesKazuya Yamaguchi, Yoshihito Watanabe, and Isao MorishimaCite this: J. Am. Chem. Soc. 1993, 115, 10, 4058–4065Publication Date (Print):May 1, 1993Publication His…
The exceptionally large positive solvatochromism of the title compound 1 spans almost the whole visible spectrum. The absorption maxima of 1 give an excellent correlation with the π* values of Kamlet and Taft, which makes it an ideal reference compound for a π* scale that is based on only one indicator dye.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffects of the dipole moment on charge transport in disordered molecular solidsPaul M. Borsenberger and John J. FitzgeraldCite this: J. Phys. Chem. 1993, 97, 18, 4815–4819Publication Date (Print):May 1, 1993Publication History Published online1 May 2002Published inissue 1 Ma…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInterdependence of shear deformations and block copolymer morphologyKaren I. Winey, Sanjay S. Patel, Ronald G. Larson, and Hiroshi WatanabeCite this: Macromolecules 1993, 26, 10, 2542–2549Publication Date (Print):May 1, 1993Publication History Published online1 May 2002Publi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, characterization, glass transition behavior, and the electronic structure of high-molecular-weight, symmetrically substituted poly(ferrocenylsilanes) with alkyl or aryl side groupsDaniel A. Foucher, Ralf Ziembinski, Ben Zhong Tang, Peter M. Macdonald, Jason Massey…
We derive an extended Jones matrix method to treat the transmission of light through birefringent networks, where the incident angle of light and the optical axis of the birefringent media are arbitrary. As an example, we employ the method to analyze the leakage problem of a twisted nematic liquid-crystal display and…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCharacterization of nickel/silica catalysts during impregnation and further thermal activation treatment leading to metal particlesCatherine Louis, Zheng Xing Cheng, and Michel CheCite this: J. Phys. Chem. 1993, 97, 21, 5703–5712Publication Date (Print):May 1, 1993Publicatio…
Results of dynamic simulations of bubbles rising through a liquid are presented. The Reynolds number of the flow based on the radius and the terminal speed of bubbles is large compared to unity, and the Weber number, which is the ratio of inertial to surface tension forces, is small. It is assumed that the bubbles do…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInteraction energies for blends of poly(methyl methacrylate), polystyrene, and poly(.alpha.-methylstyrene) by the critical molecular weight methodT. A. Callaghan and D. R. PaulCite this: Macromolecules 1993, 26, 10, 2439–2450Publication Date (Print):May 1, 1993Publication Hi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOrdered structure in blends of block copolymers. 1. Miscibility criterion for lamellar block copolymersTakeji Hashimoto, Komei Yamasaki, Satoshi Koizumi, and Hirokazu HasegawaCite this: Macromolecules 1993, 26, 11, 2895–2904Publication Date (Print):May 1, 1993Publication His…
The photophysical properties of 7-amimocoumarin derivatives with different alkylation degrees are studied in water and in different monoalcohols.Specific hydrogen bonds between the solute and protic solvents are considered to explain spectral shifts and internal conversion process.The mechanism for the internal conver…
A series of Ni(II) tetraphenylporphyrins with varying β substituents was examined by X-ray crystallography and EXAFS to assess peripheral steric effects on the conformations of the macrocycles. The compounds are the low-spin Ni(II) derivatives of 2,3,7,8,12,13,17,18-octaethyl-5,10,15,20-tetraphenylporphyrin (1), 2,3,7…