Materials Literature
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Delaminations are a principal quality problem in the manufacture of multilayer ceramic capacitors (MLC's). They are defined as a separation of the electrode and dielectric layers and can result in electrical shorts and/or life failures. Delaminations originate from many sources in MLC manufacture, but we have identifi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotoinduced destabilization of bilayer vesiclesDavid A. Frankel, Henry Lamparski, Ulrich Liman, and David F. O'BrienCite this: J. Am. Chem. Soc. 1989, 111, 26, 9262–9263Publication Date (Print):December 1, 1989Publication History Published online1 May 2002Published inissue…
Abstract The thermal oxidation of polyamide 6 and 6,6 gives rise to azomethine groups (Schiff's bases) as a result of the reaction of aldehyde and ketocarbonyl groups with amino end groups. During the course of degradation, these azomethine groups react with each other in an aldol‐type condensation to produce conjugat…
Abstract The nomenclature of CaZrTi 2 O 7 minerals has become very confused, such that zirconolite, zirkelite and polymignite each have acquired multiple meanings and represent five different crystal structures. To resolve these inconsistencies, the IMA approved resolutions as follows. Zirconolite is the non- crystall…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFormation of metal-chalcogen bonds by the reaction of metal-alkyls with silyl chalcogenidesS. M. Stuczynski, J. G. Brennan, and M. L. SteigerwaldCite this: Inorg. Chem. 1989, 28, 25, 4431–4432Publication Date (Print):December 1, 1989Publication History Published online1 May…
A general chemisorption model is proposed that yields a rate expression consistent with the quantitative structure-activity relationship (OSAR) developed by Hansch. Even complex inhibition mechanisms may be amenable to this treatment. For example, t-cinnamaldehyde (TCA) and many of its derivatives undergo slow polymer…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTVariable-density model of polymer melt surfaces: structure and surface tensionDoros N. TheodorouCite this: Macromolecules 1989, 22, 12, 4578–4589Publication Date (Print):December 1, 1989Publication History Published online1 May 2002Published inissue 1 December 1989https://pu…
Our main objective is to identify a boundary-value problem capable of describing the dynamics of fluids having moving contact lines. A number of models have been developed over the past decade and a half for describing the dynamics of just such fluid systems. We begin by discussing the deficiencies of the methods used…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGlycoconjugated tetrapyrrolic macrocyclesPhilippe Maillard, Serge Gaspard, Jean Luc Guerquin-Kern, and Michel MomenteauCite this: J. Am. Chem. Soc. 1989, 111, 25, 9125–9127Publication Date (Print):December 1, 1989Publication History Published online1 May 2002Published inissu…
Abstract Strictly reproducible syntheses of the trimorphs of composition Cu 2 Cl(OH) 3 , atacamite, paratacamite, and botallackite, have been developed. In syntheses involving direct precipitation, or reaction of aqueous solutions with solid phases, reliable results are obtained only if the temperature and time of rea…
Different results are obtained when DNA in aqueous solution and DNA in biological tissue are exposed to ultrasound. At intensities of ultrasound comparable to those applied clinically, ultrasonication is able to degrade purified DNA in aqueous solution, making ultrasonication a useful tool for preparing DNA fragments…
The diffusion-controlled relaxation model, originally proposed by Glarum for molecular liquids, is applied here to ionic transport in glasses. For the first time, the detailed frequency-dependent behaviour predicted by this model, when an exact treatment of the diffusion due to Bordewijk is employed, is discussed. It…
Following a major shortage of 99Mo in the 2009–2010 period, concern grew that the aging reactor production facilities needed to be replaced. Most producers were using highly enriched 235U (HEU) as the target material. The Organisation for Economic Co-...Read More
First a rigorous formulation is presented for the scattering of a uniform plane wave by an infinite dielectric grating waveguide, under the most general condition of oblique incidence. The results are then applied to the analysis of the guidance of waves by the dielectric grating waveguide. By using a simple coordinat…
In order to improve the understanding of de‐field‐induced resistance degradation, ceramic capacitors made from perovskite‐type titanates are formally treated as solidelectrolyte cells. Based on the consideration of the interfaces in these cells, the degradation process can be unambiguously deduced from the well‐known…
Singly substituted derivatives of cinnamaldehyde were tested as corrosion inhibitors for API J55 steel in static experiments conducted in 75% HCI at 65°C for 24 h. Four substituent sites were examined. Corrosion rates measured with added surfactants were correlated with physicochemical properties of the inhibitors, in…
Dammann gratings are binary phase gratings that are used to produce a one- or two-dimensional array of equal-intensity light spots. Recently, Dammann gratings have become of interest for their ability to provide the optical power supply to an array of optical logic devices from a single laser source. We present here a…
Furfuryl alcohol can be transformed in a simple way into the long-awaited sulfur analog of porphyrin, the tetrathiaporphyrin dication 1, isolated as the perchlorate. The key to the synthesis is a remarkably straightforward sulfur/oxygen exchange in tetraoxaporphyrinogen. As would be expected from the relatively large…
J. V. Smith and W. L. Brown. Feldspar Minerals: 1. Crystal Structures, Physical, Chemical, and Microtextural Properties. 2nd Edition. Berlin, Heidelberg and New York (Springer-Verlag), 1988. xviii + 828 pp., 352 figs. Price DM360.00. - Volume 53 Issue 373
The high temperature phase transitions and conductitivity have been studied in some single crystals of the alkaly dihydrogen phosphates and dihydrogen arsenates. The quite different nature of the high temperature phase transitions in KDP and RDP in contrast with those in CDP and CDA is established. It is shown that th…