Materials Literature
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Abstract Graphite was found to be a superior support for Pd catalyst for the direct synthesis of H2O2 from H2 and O2. The Pd/graphite catalyst prepared by HCHO reduction showed much higher H2O2 formation activity and selectivity than that prepared by impregnation. The size and morphology of Pd nanoparticles may play r…
Searching for "intelligence": Azurin-PNIPAM conjugates were prepared by site-directed mutagenesis followed by protein reconstitution by using imidazole-conjugated poly(N-isopropylacrylamides). The polymer-bound imidazole acts as a ligand in the active site of the blue copper protein azurin. The bioconjugates showed th…
Growing in line: The surface chemistry of self-assembled nanostructured block copolymers is used to control the sites at which semiconducting metal sulfide nanocrystals nucleate and grow on a surface directly from aqueous solutions. This process is a new and general strategy for the bottom-up assembly of functional na…
Abstract We report the light‐emitting diode (LED) characteristics of colloidal core‐shell CdSe/ZnS nanocrystal quantum dots (QDs) embedded in TiO 2– δ thin films on Si substrate. High‐quality CdSe/ZnS QDs were synthesized via a pyrolysis in the range of 220–280 °C. The QDs were embedded in TiO 2– δ thin film at 200 °C…
Abstract Drehsinn nach Wunsch : Die induzierte Helizität und die supramolekularen Strukturen von Polyanilinen konnten über die Methylsubstitution des Comonomers eingestellt werden. Copolymer‐Nanofasern aus Anilin und m ‐Toluidin (PMANI) wiesen die umgekehrte Helizität wie reine Polyanilin‐Nanofasern (PANI) auf, währen…
Abstract An unprecedented series of (monophthalocyaninato)lanthanide(III) complexes {[PcYb(L OMe )] ( 3 ) and [( t Bu) 4 PcLn(L OMe )] [Ln = Yb ( 4 ), Er ( 5 )]} {Pc = phthalocyaninate, L OMe – = [(cyclopentadienyl)tris(dimethylphosphito)cobaltate(III)]} were prepared by the reaction of Ln[N(SiMe 3 ) 2 ] 3 · [LiCl(THF…
The binding transition state (TS) is the rate-limiting step for transient molecular interactions. This important step in the molecular recognition process, however, is largely understood only at a qualitative level. To establish a more quantitative picture of the TS structure, we exploit a set of biophysical technique…
Abstract First order phase transitions for materials with exotic properties are usually believed to happen at fixed values of the intensive parameters (such as pressure, temperature, etc.) characterizing their properties. It is also considered that the extensive properties of the phases (such as entropy, volume, etc.)…
Periodic lime addition is recommended for naturally acidic agricultural soils, as soil pH affects nutrient availability and the toxicity of elements such as Al. Currently, lime requirements (LRs) for New York soils are derived from the actual and target pH, and exchange acidity (EA) determined by BaCl 2 –triethanolami…
Abstract We have investigated the bonding properties and bulk modulus of M 4 AlC 3 (M = V, Nb, and Ta) by first‐principles calculations. The calculated cohesive energy indicates the enhancement of bond strength of M 4 AlC 3 as V is replaced by Nb and subsequently by Ta. This conclusion was further confirmed by the ana…
Abstract Hotspots können die Empfindlichkeit der oberflächenverstärkten Raman‐Streuung (SERS) stark erhöhen, doch erklärt werden konnte dieses Phänomen bisher nicht. Eine neue Strategie (siehe Bild) setzt auf das Plasmaätzen, um an Hotspots zwischen zwei Silbernanowürfeln adsorbierte SERS‐aktive Moleküle zu isolieren…
Nanolithography at low cost and high speed is made possible by using a vibrating AFM tip in tapping-mode as a nanohammer to forge polystyrene-block-poly(ethylene/butylenes)-block-polystyrene triblock copolymer monolayer thin films after annealing to transform their microstructures from as-cast poorly ordered cylinders…
The presence of gypsum in soil, even in small amounts, is relevant from the genetic, taxonomic, and applied points of view. Moreover, those soils having gypsum as the main component, for example gypseous soils, host a number of rare and endangered organisms. Determining gypsum content in soils is crucial to understand…
Abstract Mit Gold zum Erfolg : Atomarer Sauerstoff auf einem Goldsubstrat fördert die Umwandlung von Methanol in Methylformiat, Formaldehyd und Ameisensäure bei niedriger Temperatur (siehe Bild). Die Reaktionen laufen an O‐haltigen Au‐Nanopartikeln ab, die sich bei der Oxidation mit Ozon bei 200 K auf Au(111) bilden;…
Abstract A method has been developed for building fully atomistic models of chemically crosslinked PVA. It combines a dynamic crosslinking approach followed by a high‐temperature annealing procedure. The crosslinking procedure allows to control both crosslinking density and the amount of free crosslinking sites. It al…
When emitting semiconductor nanocrystals coated with a thin silica layer containing dispersed ions are heated, the emission efficiency is drastically increased along with a red-shift and a narrowing of the photoluminescence spectrum. Originally green-emitting CdTe nanocrystals change to red emission without a change i…
Inkjet technology is a compelling method for the flexible and cost-effective printing of functional inks. We show that nanocomposite solutions based on polystyrene and differently sized core/shell-type nanocrystals (NCs) formed by a CdSe core coated with a shell of ZnS (CdSe@ZnS) in a single solvent, chloroform, can b…
Abstract Rings around a ring : The synthesis, characterization, material properties and biological studies of novel hexakis porphyrinato cyclotriphosphazene systems (see scheme) and their metal derivatives are described. magnified image A simple method has been employed to synthesize a cyclotriphosphazene appended wit…
A plasma lithography technique is developed to guide the self-assembly of colloidal quantum dots and other nanoscale building blocks, including fluorescent nanoparticles, gold nanoparticles, salts, and proteins. Plasma lithography enables the self-assembly of nanoscale materials onto soft and polymeric substrates with…
A game of Twister: The induced helicity of polyaniline and its supramolecular structures could be tuned by the methyl substitution of one of the monomers. By copolymerization of aniline with m-toluidine, the helicity of copolymer (PMANI) nanofibers was totally inverted compared to that of polyaniline (PANI), while cop…