Materials Literature
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The current-carrying capacity and reliability studies of multiwalled carbon nanotubes under high current densities (>109 A/cm2) show that no observable failure in the nanotube structure and no measurable change in the resistance are detected at temperatures up to 250 °C and for time scales up to 2 weeks. Our re…
Thermoreversible gelation behavior of polyaniline (PANI) in the presence of varying concentrations of sulfonic acids are studied. Four different sulfonic acids are used, e.g., dinonylnaphthalene sulfonic acid (DNNSA), dinonylnaphthalene disulfonic acid (DNNDSA), (±)-camphor-10-sulfonic acid (CSA), and n -dodecyloxo su…
Facile fabrication of a modified electrode with gold nanoparticles and a tris(2,2‘-bipyridine)ruthenium(II)−viologen linked thiol ( RuVS ) is described. First, the gold nanoparticles (14 ± 1 nm) were precipitated onto the gold electrode in an aqueous solution. Then, this electrode was immersed into a acetonitrile solu…
A novel synthetic concept for preparing hyperbranched polymers on a planar surface is described, in which a silicon wafer grafted with an initiator layer composed of an α-bromoester fragment is used for a self-condensing vinyl polymerization (SCVP) via atom transfer radical polymerization (ATRP). A large number of nan…
New crown-appended cholesterol-based organogelator 1, which has two cholesterol skeletons as a chiral aggregate-forming site, two amino groups as an acidic proton-binding site, and one crown moiety as a cation-binding site, was synthesized, and the gelation ability was evaluated in organic solvents. It can gelate acet…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTElectrochemistry of CdS Nanoparticles: A Correlation between Optical and Electrochemical Band GapsSantosh K. Haram, Bernadette M. Quinn, and Allen J. BardView Author Information Department of Chemistry and Biochemistry The University of Texas at Austin, Texas 78712 Cit…
Barley is recognized as a unique substrate in the malting and brewing industry. A barley seed produces fiber in the hull, pericarp, and the cell walls of the aleurone and starchy endosperm. Barley fiber can be a byproduct of other processing or one of the primary products from dry or wet milling. Pearling barley grain…
Polymer stabilized liquid crystalline systems (PSLCs) have been of considerable research interest due to their great potential in liquid crystal display applications. Of particular importance in the properties of PSLC systems is the evolution of the polymer nanostructure. The unique characteristics of fluorinated mono…
Abstract Copolyesters with an alternating sequence of terephthalic acid and aliphatic dicarboxylic acids were prepared with three different methods. First, dicarboxylic acid dichlorides were reacted with bis(2‐hydroxyethyl)terephthalate (BHET) in refluxing 1,2‐dichlorobenzene. Second, the same monomers were polyconden…
4-Dimethylaminopyridin (DMAP) macht's möglich: Mit seiner Hilfe lassen sich metallische Nanopartikel effizient von einer organischen in eine wässrige Lösung transferieren. Das Bild zeigt den Transfer von Gold-Nanopartikeln von Toluol in die wässrige Phase durch Zugabe von DMAP (0.1 M, pH 10.5). Mit dieser Methode ist…
Uniform-size poly(tetrahydrofuran)s (poly(THF)s) having N -phenyl or N -methylpyrrolidinium salt end groups ( 1 p and 1 m, respectively) carrying a dicarboxylate counteranion have been prepared as ionic polymer precursors for an intramolecular cyclization reaction. Thus, 4,4‘-biphenyldicarboxylate ( 2a ) was first int…
Caged but not trapped! Caged reagents are molecules from which biological effectors are released by photolysis. Here, p-hydroxyphenacyl bromide is used to derivatize a model peptide containing a thiophosphotyrosine residue in order to mimic phosphorylation at tyrosine. Upon photolysis, a biologically active peptide is…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTA New Synthetic Route to Benzoxazole Polymer via Tandem Claisen RearrangementGang Yang, Shin-ichiro Matsuzono, Emiko Koyama, Hideo Tokuhisa, and Kazuhisa HirataniView Author Information Nanoarchtectonics Research Center, National In…
Von organischen Radikalen zu Metallkomplexen konnte das bekannte Konzept für Ferroelektrika erfolgreich ausgedehnt werden: Die Abbildung zeigt ein Cyclophan-artiges Molekül mit einem Triplett-Grundzustand, in dem zwei CuII-Zentren von einem doppelten m-Phenylendiamid-Gerüst zusammengehalten werden.
5,10,15,20-Tetraphenyl-21 H,23 H -porphine manganese(III) chloride (Mn III TPP(Cl)) was encapsulated into MCM-41 and TiMCM-41, and its photoinduced electron transfer had been studied by using femtosecond diffuse reflectance photolysis. Two different transient species (c.a. 10 ps and c.a. 80 ps) were observed. The shor…
We report studies on the average molecular orientation state in steady and transient shear flow of two lyotropic liquid crystalline polymers: poly(benzyl glutamate) [PBG] and hydroxypropylcellulose [HPC], both in m -cresol solution. An annular cone and plate X-ray shear cell is used to probe molecular orientation in t…
The synthesis, spectroscopic properties, and electrochemistry of (BCA)Co(2) and (BCB)Co(2) are described where BCA and BCB represent biscorroles linked by an anthracenyl (A) or a biphenylenyl (B) bridge. The pyridine and CO binding properties of (BCA)Co(2) and (BCB)Co(2) are also presented, and one of the compounds in…
A novel series of poly(benzyl ether) type dendritic distyrylbenzenes bearing various electron or hole affinitive moieties including 1,3,4-oxadiazole, cyano, and propoxy groups on the outer surface of the first- and second-generations dendritic wedges have been synthesized for blue-light emission. Both theoretical and…
Alkoxides are of great interest as precursors for sol-gel processing of advanced ceramic materials, but there is very little general knowledge about the low-valent 3d-element alkoxides. The novel oxo-alkoxide, [Mn19O12(moe)14-(moeH)10].MOEH (MOE = OC2H2-OCH3), was prepared, by metathesis and auto-decomposition, from M…
Comparison of the thermal spin crossover transition in solution of a Fe(II) dinuclear triple helicate with the analogous mononuclear complex shows that the helicate transition takes place over a wider temperature range in a two step process, implying negative cooperativity.