Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, magnetism, and electrical properties of lanthanum barium titanate (La1-xBaxTiO3) (0.0 .ltoreq. x .ltoreq. 0.5)Joseph E. Sunstrom, IV and Susan M. KauzlarichCite this: Chem. Mater. 1993, 5, 10, 1539–1544Publication Date (Print):October 1, 1993Publication History Pu…
Four kinds of BN powders—amorphous BN with B 2 O 3 , partially crystallized BN without B 2 O 3 , well‐crystallized hBN with B 2 O 3 , and well‐crystallized hBN without B 2 O 3 —were prepared to determine the effect of B 2 O 3 on the crystallization of amorphous BN and the effect of BN crystallinity on the formation of…
Electron-lattice interactions in nonmetallic materials are reexamined in the many-electron scheme. The difference in the stable atomic configuration between two electronic states is the origin of the electron-lattice interaction. We show the relationship among the adiabatic potentials, one electron (hole) energy and t…
A study of the mechanical properties of basic warp-knitted, fabric-rein forced composites is presented. Three basic knitted structures have been adopted. It is found that knitted structures greatly affect the in-plane anisotropic nature, tensile strength, and modulus of warp-knitted, fabric-reinforced composites. The…
The electro-optic coefficients for the chromophore nitroamino tolane [NAT:HOCH2CH2-N(C2H5)-ϕ-C≡ C-ϕ-NO2] attached to either a poly(methyl methacrylate) or an epoxy polymer have been measured by three different techniques: attenuated total reflection, ellipsometric reflection, and Mach–Zehnder interferometry. All the r…
The objective of this study is to determine the effects of the location and concentration of synthetic absorbable yarn components in bicomponent vascular graft fabrics on their structure and properties in a controlled in vitro hydrolytic environment. Bicomponent vascular fabrics were made from Dacron and polyglycolic…
Summary Measurements of skin mechanics are required to understand better cracking and flaking of the epidermis and loss of 'elasticity'with age in the dermis. Improvements in torsional testing are described here. The resulting data was fitted to algebraic models, the parameters of which can serve both as a concise des…
Two identically constructed cotton/polyester fabrics, one made from polyester staple core/cotton-covered yarn and the other from a random blend yarn, were evaluated for their low-stress mechanical properties and hand quality, following the objective hand evaluation approach developed by Kawabata. Heat energy dissipati…
The crystal structure of recombinant rat prostatic acid phosphatase in complex with the inhibitor L(+)-tartrate was determined to 3-A resolution with protein crystallographic methods. The inhibitor binds at the carboxyl end of the parallel strands of the alpha/beta domain. One of the carboxyl groups of the tartrate mo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRefined calculation of the phase separation behavior of sheared polymer blends: closed miscibility gaps within two ranges of shear ratesR. Horst and B. A. WolfCite this: Macromolecules 1993, 26, 21, 5676–5680Publication Date (Print):October 1, 1993Publication History Publish…
Spherical lanthanum aluminate powders approximately 1 μm in diameter were produced using spray pyrolysis techniques. These materials were characterized by X‐ray diffractometry and scanning electron microscopy. Two intermediate products were produced and identified as lanthanum oxide and aluminum oxide. These intermedi…
Infrared laser pumping of Tm:LiYF4 at low temperatures on a transition between excited states leads to strong visible and ultraviolet fluorescence. These effects are believed to arise from a multistep process. In the first step photon avalanche excitation creates a population of Tm3+ ions in states near 15 000 cm−1 an…
We have investigated the effects of reactive and organofunctional silicone softeners and silane coupling agents on the performance properties of cotton fabrics. The silicone softeners were aminofunctional polydimethylsiloxane, reactive polydimethylsiloxane of high viscosity, and hydroxy-end-blocked reactive polydimeth…
We demonstrate that the addition of small amounts of a novel azo-dye to a ferroelectric liquid crystal and illumination with low intensity (∼ 0.8 mW cm−2) UV light can result in reversible, isothermal phase transitions and dramatic changes in the properties of the system. In particular we examine light induced transit…
The release of toluene diisocyanate derivatives from polyurethane foam covers that were removed from the Même breast implant was studied. The polyurethane foam covers as retrieved from the implants were contaminated on average with 2,4- and 2,6-toluene diamine (TDA), 2,4- and 2,6-toluene diisocyanate (TDI), and toluen…
Abstract Model compounds for imines formed during the thermal curing of short chain polyimides have been synthesized and characterized. These compounds have imine bonds (CN) formed by the nucleophilic attack of primary amines on imide carbonyls. The CN stretching mode appears at 1649–1664 cm −1 in the Raman and infr…
Abstract Consideration of XRD, TEM, AEM, and analytical data reported in the literature indicates that dioctahedral aluminous smectite and illite form two separate solid solutions that differ chemically from one another primarily by the extent of Al substitution for Si, the amount of interlayer K, and the presence of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of the ligand-field strength on the radiative properties of the ligand-localized 3.pi..pi.* state of rhodium complexes with 1,10-phenanthroline: proposed role of dd statesHisayuki Miki, Masashi Shimada, Tohru Azumi, J. A. Brozik, and G. A. CrosbyCite this: J. Phys. Ch…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStudies on interactions of isocyanide with transition metal complexes. 36. Synthesis and characterization of a binuclear palladium(I) complex with bridging .eta.3-indenyl ligands, Pd2(.mu.-.eta.3-indenyl)2(isocyanide)2, and its transformation to a tetranuclear palladium(I) c…
Abstract Blends of ethylene methyl acrylate (EMA) and poly(dimethylsiloxane) rubber (PDMS) are demonstrated to be miscible. The miscibility results in a single and composition‐dependent glass transition temperature. IR spectra of the blends provide direct evidence of chemical reaction between EMA and PDMS rubber.