Materials Literature
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Experiments on the contact angle of mercury with hardened cement paste (HCP) were performed. Circular holes of 150 to 1,050 micrometers in diameter were formed by casting HCP around small diameter wires. The pressure required to intrude the unevacuated, optically measured holes was used to determine a range of upper-b…
ADVERTISEMENT RETURN TO ISSUEPREVArticleThe chemistry and free energy of formation of silver nitrideEdward S. Shanley and John L. EnnisCite this: Ind. Eng. Chem. Res. 1991, 30, 11, 2503–2506Publication Date (Print):November 1, 1991Publication History Published online1 May 2002Published inissue 1 November 1991https://p…
Communication: Anodic electroprecipitation has been used to deposit thin films of cobalt oxide onto transparent, conducting glass substrates. The electrochromic effect, a reversible color change promoted by an electrochemical reaction, is demonstrated in the films making them of interest, as with WO 3 , V 2 O 5 and ot…
Abstract Raman spectra of the α‐, β‐, γ‐ and smectic polymorphs of isotactic polypropylene were recorded at 298 and 16.5 K. At 298 K the spectra of the polymorphs were very similar except in the antisymmetric CH stretching region. However, at 16 K the Raman spectra of the polymorphs show different features in several…
Dielectric, optical and electro-optical properties of four chlorinated nematic liquid crystal compounds and a eutectic mixture were characterized. Some chlorinated liquid crystals are found to exhibit a wide nematic range, modest dielectric and optical anisotropies, low viscosity and small UV absorption. Potential app…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDetermination of total and free sulfur dioxide in wine by flow injection analysis and gas-diffusion using p-aminoazobenzene as the colorimetric reagentJordi. Bartroli, Manel. Escalada, Cecilia. Jimenez Jorquera, and Julian. AlonsoCite this: Anal. Chem. 1991, 63, 21, 2532–253…
The surface basicity of magnesium and zinc aluminates has been investigated by adsorption microcalorimetry, using hexafluoro-2-propanol as an acidic probe molecule. The data have been compared to those of the component oxides Al2O3, MgO, and ZnO as well as with two aluminate samples having an excess of bivalent ions w…
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+/…