Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSilicon-29 MAS NMR investigation of the sodium oxide-alumina-silica glassesHideki Maekawa, Takashi Maekawa, Katsuyuki Kawamura, and Toshio YokokawaCite this: J. Phys. Chem. 1991, 95, 18, 6822–6827Publication Date (Print):September 1, 1991Publication History Published online1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffects of shear on miscible polymer blends: in situ fluorescence studiesS. Mani, M. F. Malone, Henning H. Winter, J. L. Halary, and L. MonnerieCite this: Macromolecules 1991, 24, 19, 5451–5458Publication Date (Print):September 1, 1991Publication History Published online1 Ma…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal properties and stereoregularity of poly(3-hydroxybutyrate) prepared from optically active .beta.-butyrolactone with a zinc-based catalystNaoki Tanahashi and Yoshiharu DoiCite this: Macromolecules 1991, 24, 20, 5732–5733Publication Date (Print):September 1, 1991Public…
When a ceramic‐to‐metal brazed joint is fabricated, residual stresses develop as the material is cooled from the brazing temperature to room temperature. These residual stresses reduce the strength of the brazed joint, and in some cases lead to catastrophic failure at or near an interface, during the brazing process i…
The liquid-crystalline phase behavior of a fluid of biaxial hard particles (spheroplatelets) is studied using a scaled particle calculation of the fluid configurational entropy combined with a cell description of translational order. If translational ordering is ignored, the density versus particle biaxiality phase di…
The synthesis of novel liquid-crystalline heteroaromatic compounds incorporating the five membered 1,3,4-oxadiazole ring is described. Due to the bent molecular structure of the oxadiazole ring their mesophase stability is low if the heterocyclic ring occupies a central position, but it is increased if this ring is sh…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAluminum(III) speciation with acetate and oxalate. A potentiometric and aluminum-27 NMR studyFabien Thomas, Armand Masion, Jean Yves Bottero, James Rouiller, Francine Genevrier, and Denis BoudotCite this: Environ. Sci. Technol. 1991, 25, 9, 1553–1559Publication Date (Print):…
Abstract Forty‐four soil clays and four reference phyllosilicate clays were used to establish qualitative and quantitative relationships between clay mineral characteristics and K fixation. The soil clays were obtained from Vertisols, Vertic Mollisols, Haploxerolls, Xerochrepts, and a Palexeralf, from three semiarid r…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydrothermal synthesis and structural characteristics of two layered mixed-valence vanadyl phosphate hydrates Na0.50VOPO4.2.0.H2O and K0.50VOPO4.1.5.H2OS. L. Wang, H. Y. Kang, C. Y. Cheng, and K. H. LiiCite this: Inorg. Chem. 1991, 30, 18, 3496–3499Publication Date (Print):S…
Fabric drape of a number of fabrics was measured using a digital Drape Tester and was found to be significantly correlated with the subjective evaluation of drape. Fabrics were draped on two different-sized pedestal plates, and differences in draping behavior between plates and among fabrics were determined Composite…
Abstract The three isomeric 1,4:3,6‐dianhydroalditols with D ‐ gluco ‐ ( 2 ), D ‐ manno ‐ ( 11 ) and L ‐ ido ( 17 ) configuration and both 1,4‐anhydroalditols with threo ( 22 ) and erythro ( 27 ) configuration were efficiently transformed into the corresponding diamino derivatives. Interfacial polycondensation of thes…
It is demonstrated that it is possible to grow thin alumina films on an alumina substrate by the sequential adsorption of water and trimethyl aluminum (TMA) both on high-surface-area alumina and in ultrahigh vacuum (UHV) at room temperature. The presence of the resulting layer is demonstrated on high surface-area subs…
Extravasation of intravenously injected contrast medium is a well-known complication of radiologic procedures. Records from a 27-month period were reviewed of 28 patients in whom extravasation of nonionic contrast medium occurred during computed tomographic (CT) scanning. Extravasated amounts ranged from 3 mL in an in…
The reflection and transmission properties of finely divided fractal layers are investigated and characterized. The results for electromagnetic or optical waves normally incident upon generalized Cantor bar fractal multilayers are found for various fractal dimensions and stages of growth. A new exact self-similar algo…
Abstract Three poly(vinylidene fluoride) whole polymers were fractionated according to their head‐to‐head concentrations. Their melting temperatures and fusion properties were studied. Although small but significant differences were found among the fractions obtained from a given parent polymer, a wide range in chain…
Abstract Current models attribute the power law frequency dependence of ionic conductivity in oxide glasses alternatively to structural disorder or to interactions between moving ions. To distinguish between the influence of disorder and of interaction the frequency dependence of conductivity was investigated for thre…
Thermal helium desorption from homogeneously implanted iron and vanadium foils was investigated during linear heating and isothermal annealing, respectively. The isothermal experiments showed an initial period with a square-root dependence of the desorbed helium on time, characteristic of atomic helium diffusion, foll…
AIN ceramics with densities varying from 3.18 to 3.30 g/cm 3 and room‐temperature thermal conductivities varying from 88 to 193 W/m K were produced. Different sintering conditions, packing powders, AIN powder sources, carbon additive, and sintering times were evaluated, and the key processing parameters which cause th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe primary reaction in the decomposition of ozone in acidic aqueous solutionsKnud Sehested, Hanne Corfitzen, Jerzy Holcman, Christian H. Fischer, and Edwin J. HartCite this: Environ. Sci. Technol. 1991, 25, 9, 1589–1596Publication Date (Print):September 1, 1991Publication H…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular structures of supported niobium oxide catalysts under in situ conditionsJih Mirn Jehng and Israel E. WachsCite this: J. Phys. Chem. 1991, 95, 19, 7373–7379Publication Date (Print):September 1, 1991Publication History Published online1 May 2002Published inissue 1 Se…