Materials Literature
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The photoluminescence (PL) and infrared stimulated luminescence (ISL) spectra of CaS:Eu,Sm infrared stimulable phosphors (ISPs) are studied. In addition, the concentration dependence of ISL intensity is examined. Sm 3+ - and Eu 2+ -related structures are found in both the PL excitation and emission spectra. Two types…
X-ray and electron beam damage studies were performed on Br-terminated and methyl-terminated alkylsilane self-assembled monolayers. X-ray beam initiated damage was primarily limited to removal of the labile Br group and did not significantly damage the hydrocarbon chain. Some of the x-ray beam damage could be attribut…
Thermal fusion or welding of collagen-rich tissues involves the thermal denaturation of collagen which is reflected by changes in birefringence intensity in histologic sections. The weld bond between two severed edges is formed when the apposed ends of the collagen fibrils unravel during heating then re-entwine during…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMultisite functionalized dendritic macromolecules prepared via metalation by superbases and reaction with electrophilesL. Lochmann, K. L. Wooley, P. T. Ivanova, and J. M. J. FrechetCite this: J. Am. Chem. Soc. 1993, 115, 15, 7043–7044Publication Date (Print):July 1, 1993Publ…
Si(111) wafers, cut at angles between 0° and 5° in the [112̄] direction, were prepared by a standard RCA cleaning process followed by a rinse in HF/NH4F solutions with different pH values. Si–SiO2 structures were formed on these surfaces by a two-step low-temperature plasma-assisted oxidation/deposition process, and c…
Abstract Blends of biodegradable polymers having properties distinct from the individual polymer components, and that are suitable for use as carriers of pharmaceutically active agents, were prepared from two or more polyanhydrides, polyesters, and mixtures of polyanhydrides and low molecular weight polyesters. The bl…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and molecular characterization of narrow molecular weight distribution fractions of methyl-substituted poly(aryl ether ether ketone)Fei Wang, Jacques Roovers, and Paul M. ToporowskiCite this: Macromolecules 1993, 26, 15, 3826–3832Publication Date (Print):July 1, 19…
A cell growth factor protein (insulin) and/or a cell-adhesion protein (fibronectin) were immobilized on surface-hydrolyzed poly(methyl methacrylate) membranes. The growth of mouse fibroblast cells STO was accelerated by the immobilized insulin. This acceleration was enhanced by introduction of spacer arms. Coimmobiliz…
Pulse labelling experiments and enzyme studies show that Thermoproteus tenax is able to degrade glucose via the Embden-Meyerhof-Parnas (EMP) pathway. T. tenax is the first archeum for which the glycolytic EMP pathway could be established. One of the key enzymes, 6-phosphofructokinase of T. tenax depends on (pyrophosph…
A decaborane-based boronization system has been installed in the JT-60U tokamak in order to reduce the influx of impurities during plasma discharges. Boronization has been performed under a glow discharge using a helium-decaborane gas mixture. The properties of the boron films deposited through boronization and the ef…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics of neutral transition-metal atoms in the gas phase: oxidation reactions of titanium (a3F) from 300 to 600 KMark L. Campbell and Roy E. McCleanCite this: J. Phys. Chem. 1993, 97, 30, 7942–7946Publication Date (Print):July 1, 1993Publication History Published online1…
A polyurethane having both a high permeable property at warm tem peratures and a thermal insulate property at cold temperatures was developed with significantly different levels of permeability within a narrow temperature range. The development was made in order to achieve a breathable, waterproof sportswear material…
Cl2GaP(SiMe3)22 (1) has been prepared form the 1:1 reaction of GaCl3 with P(SiMe3)3. Thermal decomposition of 1 produces a brown powder which contains GaP, as evidenced by an X-ray powder pattern and partial elemental analysis. Compound 1 crystallizes in the monoclinic space group P21/n ( 14) with a - 9.754(2), b = 15…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSelective anion inclusion in calix(4)arene complexes driven by face-bridging .mu.4-halide bindingWei Xu, Jadagese J. Vittal, and Richard J. PuddephattCite this: J. Am. Chem. Soc. 1993, 115, 14, 6456–6457Publication Date (Print):July 1, 1993Publication History Published onlin…
Amorphous silicate grain boundary phases of varying chemistry and amounts were added to 3Y‐TZP in order to determine their influence on the superplastic behavior between 1200° and 1300°C and on the room‐temperature mechanical properties. Strain rate enhancement at high temperatures was observed in 3Y‐TZP containing a…
The resistivities in Al 70 Pd 20 Re 10 alloy of the icosahedral phase are quite sample dependent, possibly due to slight variation of the alloy composition. In some samples, the resistivity at room temperature is ∼0.01 Ω·cm and that at 4.2 K is as high as ∼0.1 Ω·cm; these values are much higher than any values reporte…
Abstract The donor-acceptor type molecular conductor, α-(EDT-TTF)[Ni(dmit)2], was found to be a superconductor under ambient pressure below 1.3 K. This is the first ambient-pressure superconductor in a series of M(dmit)2 salts [M = Ni, Pd, Pt]. The sample dependence and magnetic-field dependence on the superconducting…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTControlled electron transfer between cyclodextrin-sandwiched porphyrin and quinonesYasuhisa Kuroda, Mitsuru Ito, Takashi Sera, and Hisanobu OgoshiCite this: J. Am. Chem. Soc. 1993, 115, 15, 7003–7004Publication Date (Print):July 1, 1993Publication History Published online1 M…
The thermal decomposition of lanthanum(IIl) and cerium(IV) chelates of dibenzoylmethane anthranilic acid was studied by TG. The mechanism of the decomposition reactions were found to be random nucleation as established from TG data. Activation energies, E, pre-exponential factors, A, entropy of activation, ΔS, orders…
ABSTRACT Sorption characteristics, rates and capacities of polymeric adsorbents (XAD‐4, XAD‐7, XAD‐16, Duolite ES‐865, Duolite S‐761, Porapak‐Q and XUS‐43436) for ethyl butyrate and octanal were determined using model solutions. Sorption of these two principal components of aqueous orange essence, was evaluated utiliz…