Materials Literature
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Abstract A simple technique is described for constructing a glucose sensor by the entrapment of glucose oxidase (GOD) in a polyaniline (PA), poly( o ‐toluidine) (POT) and their copolymer poly(aniline‐co‐ o ‐toluidine) (PA‐co‐POT) thin films, which were electrochemically deposited on a platinum plate in phosphate and a…
We present the photostability results of seven novel electro-optic chromophores made to be used in high-speed fiber optic signal modulators. We measured the photobleaching rate of the chromophores at room temperature by using a fiber optic pump−probe technique. Thin polymer film guest−host samples were deposited on th…
We have investigated some of the basic principles that influence generation of protein structures using a fragment-based, random insertion method. We tested buildup methods and fragment library quality for accuracy in constructing a set of known structures. The parameters most influential in the construction procedure…
The time-dependent scaling of the thermoremanent and zero-field-cooled susceptibilities in ferromagnetic spin systems undergoing aging after a quench to a temperature at or below criticality is studied. A recent debate on their interpretation is resolved by showing that for systems with a short-ranged equilibrium spin…
Abstract 2,5‐Bis‐(3,4‐dicarboxyphenylcarboxyethoxy)‐4′‐nitrostilbene dianhydride was prepared and reacted with 1,4‐phenylenediamine, 4,4′‐oxydianiline, 4,4′‐diaminobenzanilide, and 4,4′‐(hexafluoroisopropylidene)dianiline to yield unprecedented novel T‐type polyimides ( 4 – 7 ) containing 2,5‐dioxynitrostilbenyl group…
We report here studies directed toward the synthesis and characterization of cross-linked poly(ethylene oxide) gels for use as drug delivery platforms. These gels were prepared by anionic ring-opening polymerization of diepoxy PEO 400, PEO 3400, and PEO 8000 using t -BuOK as the initiator. The diepoxy PEO 3400 and PEO…
The optical basicity treatment of oxidic network systems, for example silicates, has been successful in correlating a range of properties; since the method has the advantage of avoiding such problems as those associated with “single ion” activities, it allows comparisons between many different systems. However, severa…
Two kinds of aqueous dispersions were prepared from waterborne polyurethane (WPU) and its prepolymer by mixing (M) and grafting (G) with 10 wt % casein, respectively. The resulting dispersions were characterized by using a rotary viscometer and a particle size distribution meter, indicating that the viscosity, Z avera…
We investigate the influence of local-field effects on the electromagnetic response of a collection of dipoles. We derive the local-field corrected static polarizability for a collection of dipoles in the case of a scatterer with uniform depolarization. We then use this correction within the discrete dipole approximat…
We report crystal-field splitting investigations of ${\mathrm{Gd}}^{3+}{(4f}^{7})$ energy levels determined from high resolution energy (Stark) level cathodoluminescence (CL) spectroscopy of Gd-implanted 2H-aluminum nitride (AlN) in the wavelength range 250 to 320 nm and at temperatures 12, 77, and 300 K. The CL spect…
Abstract Eine Vielzahl von theoretischen Untersuchungen und Experimenten zeigt, dass gelöste Dendrimere sich wie flexible Polymere in guten Lösungsmitteln verhalten und daher am besten als Makromoleküle mit einem dichten Kern und fluktuierenden Monomerbausteinen beschrieben werden. Wir zeigen hier mithilfe von analyti…
The present work describes a new way to synthesize manganese species within the channels of mesoporous MCM-48 silica using permanganate as manganese precursor agent. For the first time permanganate ions were incorporated within the as-synthesized mesoporous host by ion-exchange process. The resulting materials were ch…
CdS nanoparticles with surfaces modified by mercaptoethanol have been synthesized for greater solubility in dimethylformamide (DMF) and the ability to preferentially bind to the poly(ethylene oxide) (PEO) blocks of polystyrene- block -poly(ethylene oxide) (PS- b -PEO) copolymer. The size of the surface-modified CdS na…
Adding to the confusion: [3+2] coupling of confused tripyrrane and confused dipyrromethane dicarbinol, followed by oxidation, results in the synthesis of meso-pentafluorophenyl-substituted, doubly N-confused, oxo-substituted pentaphyrins (see X-ray crystal structure; green: F, blue: N, red: O). The oxopyrrole moieties…
We report here the synthesis of (TiO 2 ) x (Al 2 O 3 ) 1 - x nanopowders with molar ratios that span the TiO 2 −Al 2 O 3 composition range. The nanopowders were synthesized using liquid-feed flame spray pyrolysis (LF−FSP) of mixtures of N(CH 2 CH 2 O) 3 TiOiPr (titanatrane isopropoxide) and N(CH 2 CH 2 O) 3 Al (alumat…
Pseudomonas aeruginosa alcohol dehydrogenase (PaADH; ADH, EC 1.1.1.1) catalyzes the reversible oxidation of primary and secondary alcohols to the corresponding aldehydes and ketones, using NAD as coenzyme. We crystallized the ternary complex of PaADH with its coenzyme and a substrate molecule and determined its struct…
Stimmig: Ein Material, das eine Valenztautomerisierung eingeht, wurde durch das Abstimmen der elektronischen Eigenschaften eines zweikernigen Cobalt-Polyoxolen-Komplexes (schematisch gezeigt) erhalten, der ein dreiwertiges Metallion als Hilfspartner enthält. Die thermisch oder durch Licht induzierbare Tautomerisierung…
Abstract In this comparative study, the effect of carbon black (CB) on the thermal ageing characteristics of poly(ethylene‐co‐vinyl acetate) (EVA) was investigated. EVA, containing 13% vinyl acetate (VA), and poly(ethylene‐co‐vinyl acetate)/carbon black mixture (EVA/CB) containing 13% VA and 1% CB were aged at 85°C in…
Scanning tunneling microscopy (STM) and optical spectroscopy measurements were performed on InAs nanorods 7 to 25 nm long. Both methods reveal a clear dependence of the band-gap on length, with a red shift for longer rods. This (zero-dimension like) behavior is different than that of CdSe rods, where the band-gap is n…
Abstract Blends of poly( ε ‐caprolactone) (PCL) with zein (PCL/zein) in different proportions (100/0, 75/25, 50/50, 25/75 and 0/100 wt% containing 5 wt% glycerol) were compared based on their mechanical properties (tensile strength, elongation at break, and Young's modulus), and on their thermal properties, the latter…