Materials Literature
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Deposition of anatase TiO2 thin films on soda-lime glass has been achieved by firing an adhered precursor titanium(IV) complex of ethylenediamine-N,N,N′,N′-tetraacetic acid (H4edta) between 450 and 550 °C in air. The coating solution was prepared by the reaction of a neutral [Ti(H2O)(edta)] complex, obtained from TiCl…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTStability of Carbon Nitride Materials at High Pressure and TemperatureAndrew J. Stevens, Takaaki Koga, Carl B. Agee, Michael J. Aziz, and Charles M. LieberView Author Information Department of Chemistry and Chemical Biology Division of Engineering and Applied Sciences…
The diradical 1,1‘,5,5‘-tetramethyl-6,6‘-dioxo-3,3‘-biverdazyl, 6, crystallizes in a monoclinic unit cell with a = 4.224(1), b = 17.378(2), c = 7.529(1) Å, β = 96.02(1)°, space group P 2 1 / c (No. 14). The crystal structure of 6 shows local D 2 h symmetry. ESR measurements in a frozen chloroform solution indicate tha…
The crystallization and microphase separation of compatible mixtures of tetrahydrofuran−methyl methacrylate diblock copolymers (PTHF- b -PMMA) with a tetrahydrofuran homopolymer (PTHF) were studied by means of synchrotron small-angle X-ray scattering (SAXS) and differential scanning calorimetry (DSC). The crystallizat…
Nd/sub 2/Fe/sub 14/B is currently the best (highest energy product) hard magnet available. Like most permanent magnetic materials, it is rather brittle. The fracture toughness of specimens of commercially available hard magnets were measured using a chevron notch, three-point bend test. Values for Nd/sub 2/Fe/sub 14/B…
Measurements of the sorption isotherms (at 298 K) for Ar, O 2, and N 2 in several polyaniline emeraldine base (PANi-EB) forms were made (as-cast film, powder, and fully undoped film) over the pressure range 100−1300 kPa. Model fits of the sorption isotherms were made using a modified Flory−Huggins equation (MFHE) and…
Previously, we have developed a colloidal dextran-stabilized monocrystalline iron oxide nanocompound (MION-46) as a magnetic label for magnetic resonance imaging (MRI). In an effort to use this magnetic label to visualize pancreatic receptor function by MRI in vivo, we investigated the potential of secretin as a vecto…
When a specimen surface carrying a high-frequency line grating is examined under a scanning electron microscope (SEM), moiré fringes are observed at several different magnifications. The fringes are characterized by their spatial frequency, orientation, and contrast. These features of the moiré pattern depend on the s…
Head-to-head regioregular poly( p -phenylene)s (PPPs) were synthesized via Ni(0)-catalyzed polymerization of 2,2‘-disubstituted 4,4‘-bis[(methylsulfonyl)oxy]biphenyls ( 9 ). The corresponding regioirregular PPPs were prepared by the Ni(0)-catalyzed homopolymerization of 2-substituted 1,4-bis[(methylsulfonyl)oxy]benzen…
A spirocyclic initiator was synthesized from dibutyltin oxide and pentaerythritol. This spirocyclic distannoxane was characterized by elemental analyses, NMR spectroscopy, and a stoichiometric reaction with γ-thiobutyrolactone. ε-Caprolactone (ε-CL) was polymerized in bulk at 70 °C with variation of the monomer/initia…
X-ray diffraction and FTIR and 13 C NMR spectroscopies have been utilized to observe the inclusion compounds (ICs) formed by poly(ethylene oxide) (PEO) and low molecular weight poly(ethylene glycol) (PEG) oligomer with urea (U). We have confirmed that PEO-U-IC formed from solution has a trigonal crystal structure, whi…
The nature of dielectric relaxation is studied in a number of supercooled monohydroxy alcohols in the frequency range (10 6 −10 -3 Hz) at temperatures above 77 K. Differential scanning calorimeter (DSC) measurements are also carried out on all the alcohols above 100 K. The temperature dependence of the relaxation rate…
Mammalian and yeast cells contain three isozymes of isocitrate dehydrogenase: mitochondrial NAD- and NADP-specific enzymes and a cytosolic NADP-specific enzyme. Independent metabolic functions of these enzymes in Saccharomyces cerevisiae were examined by analyses of expression and of phenotypes displayed by mutants co…
Phase behavior and dynamics of liquid−liquid phase separation in binary blends of crystalline polymers, viz., poly(vinylidene fluoride) (PVF 2 ) and poly(butylene adipate) (PBA), have been studied by means of time-resolved light scattering. According to our previous calorimetric study, a single glass transition and tw…
Abstract Dissolution and crystal growth on the (010) cleavage surface of mineral gypsum have been studied by scanning force microscopy, which allows observation of surfaces while they are in contact with aqueous solutions. Etch pits formed on the (010) surface in contact with solutions undersaturated with respect to g…
Using picosecond transient absorption spectroscopy we have examined the dynamics of Cp*Ir(CO) 2 (Cp* = C 5 Me 5 ) in cyclohexane and Cp*Rh(CO) 2 in n -pentane solution at room temperature following 295-nm UV excitation. A transient absorption with an instrument limited risetime was observed for Ir from 440 to 740 nm a…
We model the static and dynamic wetting properties of nonsoluble liquids on surfaces protected by end-grafted molten polymers. We show that in many situations the spreading dynamics should be controlled by viscoelastic phenomena in the polymer films. Temperature changes can cause the spreading velocities to be varied…
The new heteropolyperoxometalate compounds [NMe4][(Me2AsO2){MoO(O2)2}2]1, [NMe4][(Ph2PO2){MoO(O2)2}2]2, [NBun4][(Ph2PO2){WO(O2)2}2]3 and [NH4][(Ph2PO2){MoO(O2)2(H2O)}]4 have been isolated and their crystal structures determined. Compounds 1–3 are dinuclear, whilst compound 4 is mononuclear; in all four structures the…
We report here a comparison of the ability of the monodentate Lewis base n -propylamine and the bidentate molecule ethylenediamine to quench the photoluminescence of light-emitting silicon in three different structural environments. These include porous silicon fabricated from p-type substrates; porous silicon from n-…
New discotic liquid crystals with one, two, or three reactive acrylate end groups were synthesized. They exhibit a wide discotic nematic phase and show spontaneous homeotropic alignment between substrates. The photoinitiated polymerization of these materials was studied. “In-situ photopolymerization” of these disklike…