Materials Literature
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The electronic structures of ${\mathrm{BaSnO}}_{3}$, ${\mathrm{BaSbO}}_{3}$, and ${\mathrm{BaPbO}}_{3}$, calculated using an extended general-potential linearized augmented-plane-wave method, are reported. The electronic structures of ${\mathrm{BaSnO}}_{3}$ and its 6s analog ${\mathrm{BaPbO}}_{3}$ are found to be very…
For a natural single crystal of zircon, ZrSiO4, from Sri Lanka, exhibiting zonation in U and Th contents, the hardness and elastic modulus have been determined as a function of α-decay dose using a mechanical properties microprobe (MPM). The zones vary in thickness from one to hundreds of micrometers, and have uranium…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermodynamics of the melting point depression in poly(β-hydroxybutyrate-co-β-hydroxyvalerate) copolymersWilliam J. Orts, Robert H. Marchessault, and Terry L. BluhmCite this: Macromolecules 1991, 24, 24, 6435–6438Publication Date (Print):November 1, 1991Publication History P…
A range of Bacillus strains were examined for their ability to accumulate poly-D(-)-3-hydroxyalkanoates (poly-HAKs) which are naturally occurring materials that are optically active, biodegradable thermoplastics. The organisms could produce poly-D(-)-3-hydroxybutyrate (poly-HB) up to 50% of cell dry weight. The conten…
Abstract Palygorskite is the dominant clay mineral in a petrocalcic horizon of the Rotura soil series (a coarse‐loamy, mixed, thermic, Typic Haplargid), a soil of middle Pleistocene age in southern New Mexico. The purpose of this study was to determine if palygorskite is eolian in origin, inherited from its alluvial p…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDiffusion of a symmetric block copolymer in a periodic potentialJean Louis Barrat and Glenn H. FredricksonCite this: Macromolecules 1991, 24, 24, 6378–6383Publication Date (Print):November 1, 1991Publication History Published online1 May 2002Published inissue 1 November 1991…
The reduction of the diffusion coefficient of latex spheres near glass surfaces was measured by photon correlation spectroscopy. Theory and experiment are not in agreement; possible causes for the discrepancy are discussed. In addition, the diffusion coefficient of sedimented latex spheres on a glass surface decreases…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSurface modification of BPDA-PDA polyimideKang Wook Lee, Steven P. Kowalczyk, and Jane M. ShawCite this: Langmuir 1991, 7, 11, 2450–2453Publication Date (Print):November 1, 1991Publication History Published online1 May 2002Published inissue 1 November 1991https://doi.org/10.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDetermination of the electronic structure of oligofurans and extrapolation to polyfuranGiuseppe Distefano, Derek Jones, Maurizio Guerra, Laura Favaretto, Alberto Modelli, and Giuliano MengoliCite this: J. Phys. Chem. 1991, 95, 24, 9746–9753Publication Date (Print):November 1…
ABSTRACT Powdered cellulose is a natural beta‐l,4‐glucan polymer. It is 99% total dietary fiber (dwb) and has many uses as a low‐calorie food ingredient. Depending on its fiber length, cellulose can retain 3.5 to 10 times its weight in water. Temperature and pH exerted small effects on water rentention capacity. A pow…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCalculation of the free energy for gas absorption in amorphous polypropyleneFlorian Mueller-PlatheCite this: Macromolecules 1991, 24, 24, 6475–6479Publication Date (Print):November 1, 1991Publication History Published online1 May 2002Published inissue 1 November 1991https://…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTContact electrification: ion transfer to metals and polymersA. F. Diaz, D. Wollmann, and D. DreblowCite this: Chem. Mater. 1991, 3, 6, 997–999Publication Date (Print):November 1, 1991Publication History Published online1 May 2002Published inissue 1 November 1991https://pubs.…
Co/sup 2+/ and Ti/sup 4+/ substituted M-type barium ferrite, BaFe/sub 12-2x/Co/sub x/Ti/sub x/O/sub 19/, with x from 0 to 0.9 has been prepared using a modified ceramic method and investigated by electron microscopy, vibrating sample magnetometry and Mossbauer spectroscopy. Results show that Co/sup 2+/ and Ti/sup 4+/…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLuminescence of the europium(3+) ion in zirconium(4+) compoundsD. Van der Voort and G. BlasseCite this: Chem. Mater. 1991, 3, 6, 1041–1045Publication Date (Print):November 1, 1991Publication History Published online1 May 2002Published inissue 1 November 1991https://pubs.acs.…
Abstract Better information is needed to predict how soil acidity affects exchangeability of heavy metals in soils dominated by Fe and Mn oxides with pH‐dependent charge. Our laboratory study sought to separate exchangeable and nonexchangeable Zn sorbed by four B horizon soil materials with varied mineralogy and sesqu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSulfonation of (aryloxy)- and (arylamino)phosphazenes: small-molecule compounds, polymers, and surfacesHarry R. Allcock, Richard J. Fitzpatrick, and Lawrence SalvatiCite this: Chem. Mater. 1991, 3, 6, 1120–1132Publication Date (Print):November 1, 1991Publication History Publ…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReduction and oxidation of cellulose surfaces by means of cold plasmaC. M. Gilbert Carlsson and Goeran StroemCite this: Langmuir 1991, 7, 11, 2492–2497Publication Date (Print):November 1, 1991Publication History Published online1 May 2002Published inissue 1 November 1991http…
Abstract The field of thermoplastic elastomers has shown an explosive growth with the successful commercialization of elastomeric alloys (EAs) in 1981, based on the original work of Coran, Das, and Patel on dynamic vulcanization and the discovery of preferred cure system by Abdou-Sabet and Fath. These discoveries have…
The electron density function of rho (r) in a crystal determines its diffraction pattern, that is, both the magnitudes and phases of its X-ray diffraction maxima, and conversely. If, however, as is always the case, only magnitudes are available from the diffraction experiment, then the density function rho (r) cannot…
The NAC (nitrogen assimilation control) protein from Klebsiella aerogenes is a LysR-like regulator for transcription of several operons involved in nitrogen metabolism, and couples the transcription of these sigma 70-dependent operons to regulation by the sigma 54-dependent NTR system. NAC activates expression of oper…