Materials Literature
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Synthetic biodegradable polymeric matrices, with a dense top layer and porous under-layer, made of a (poly)ether/(poly)ester (PEO:PBT) copolymer called Polyactive, and also of poly-L-lactide (PLLA), are under investigation as part of a cell-seeded skin substitute for third-degree, large-scale skin defects. The biocomp…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDesign and Synthesis of a Trifunctional Chiral Porphyrin with C2 Symmetry as a Chiral Recognition Host for Amino Acid EstersTadashi Mizutani, Tadashi Ema, Takashi Tomita, Yasuhisa Kuroda, and Hisanobu OgoshiCite this: J. Am. Chem. Soc. 1994, 116, 10, 4240–4250Publication Dat…
The effects of various braiding parameters for 2-D triaxially braided textile composites were systematically investigated both experimentally and analytically. Four different fiber architectures designed to provide a direct comparison of the effects of braid angle, yarn size and axial yarn content were tested. Moiré i…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEnvironmental Effects on Nonlinear Optical Chromophore Performance. Calculation of Molecular Quadratic Hyperpolarizabilities in Solvating MediaSanto Di Bella, Tobin J. Marks, and Mark A. RatnerCite this: J. Am. Chem. Soc. 1994, 116, 10, 4440–4445Publication Date (Print):May…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemistry and Physics of a Molecular-Based Magnet Containing Three Spin Carriers, with a Fully Interlocked StructureHumberto O. Stumpf, Lahcene Ouahab, Yu Pei, Pierre Bergerat, and Olivier KahnCite this: J. Am. Chem. Soc. 1994, 116, 9, 3866–3874Publication Date (Print):May 1…
Abstract A rapid technique for evaluating the rate and state of dispersion of carbon black in natural rubber has been extended to study the dispersion of carbon black in various polymers. The technique measures the extent and rate of dispersion of the black in the rubber. The kinetics of dispersion was characterized f…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpectroscopic Characterization of the Fe/ZrO2 System: 1. CO AdsorptionEugenio GuglielminottiCite this: J. Phys. Chem. 1994, 98, 18, 4884–4891Publication Date (Print):May 1, 1994Publication History Published online1 May 2002Published inissue 1 May 1994https://doi.org/10.1021/…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTConformational Order in Molten Amorphous Poly(ethyl methacrylate)Andrzej S. Kulik, Detlev Radloff, and Hans W. SpiessCite this: Macromolecules 1994, 27, 11, 3111–3113Publication Date (Print):May 1, 1994Publication History Published online1 May 2002Published inissue 1 May 199…
Article Microstructure and Mechanical Properties of Mechanically Alloyed Intermetallic Me,Si-Al Alloys was published on May 1, 1994 in the journal International Journal of Materials Research (volume 85, issue 5).
The mechanism of the foam-inhibiting action of simethicone, mainly used against flatulence, has been studied. Its effect on foaming systems containing synthetic gastric juice and a surface-active substance (anionic surfactant, cationic surfactant, soap solution) was quantitated by measuring the surface tension, foam s…
Improved purification and processing techniques have been utilized to fabricate Ge/sub 30/As/sub 10/Se/sub 30/Te/sub 30/ glass fibers with a minimum loss of O.11 dB/m at 6.6 /spl mu/m. This is the lowest loss reported for any telluride glass fiber in the infrared region. Furthermore, the fibers exhibit less than 1 dB/…
Shock processing consolidates powders at high dynamic pressures over a very short time span. In contrast to conventional sintering, the temperature distribution in the particles is not uniform. The temperature increase at a material point is caused by the mechanical work associated with the compression and plastic flo…
We have constructed a nematic liquid crystal system that exhibits the dynamics of a two-dimensional XY model. The system consists of liquid crystal material placed between two sapphire windows coated with homeotropic alignment material. By holding the windows at two different temperatures, a thermal gradient can be ma…
Stable indentation cracks were grown in four‐point bend tests to study the fracture toughness of two Y 2 O 3 ‐stabilized ZrO 2 ceramics containing 3 and 4 mol% Y 2 O 3 . By combining microscopic in situ stable crack growth observations at discrete stresses with crack profile measurements, the dependence of toughness o…
The mineralization of cellulosic and proteinaceous fibres has been simulated using oxygenated aqueous solutions. In addition to chemical analysis of the fibres and the aqueous media, the reactions of the fibres were studied by scanning electron microscopy (SEM), Fourier transform infrared (FTIR) microscopy and reflect…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStability of the OBDD Structure for Diblock Copolymer Melts in the Strong Segregation LimitAlexey E. Likhtman and Alexander N. SemenovCite this: Macromolecules 1994, 27, 11, 3103–3106Publication Date (Print):May 1, 1994Publication History Published online1 May 2002Published…
Glass‐ceramic composites with improved high‐temperature mechanical properties have been produced by incorporating continuous SiC fibers into a barium magnesium aluminosilicate matrix. Control of the fiber/matrix interface was achieved by a dual‐layer coating of SiC/BN(C) applied to the fibers by CVD. The weakly bonded…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and Characterization of Mononuclear Octahedral Titanium(IV) Complexes Containing Ti:O, Ti(O2), and Ti(OCH3)x (x = 1-3) Structural UnitsPeter Jeske, Gabriele Haselhorst, Thomas Weyhermueller, Karl Wieghardt, and Bernhard NuberCite this: Inorg. Chem. 1994, 33, 11, 24…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHigh-Speed "Immortal" Polymerization of Epoxides Initiated with Aluminum Porphyrin. Acceleration of Propagation and Chain-Transfer Reactions by a Lewis AcidMasaki Akatsuka, Takuzo Aida, and Shohei InoueCite this: Macromolecules 1994, 27, 10, 2820–2825Publication Date (Print)…
In cereal alpha-amylase gene promoters the cis-acting gibberellin response element (GARE) is required for increased transcription in the presence of gibberellin. In low-isoelectric point (pI) alpha-amylase gene promoters a second type of cis element, termed a coupling element, must also be present in a specific positi…