Materials Literature
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The X-ray photoelectron spectroscopic characterizations of Pt nanoparticles evaporated onto untreated and Ar + -treated highly oriented pyrolytic graphite surfaces, with, respectively, low and high surface defect densities have been studied using multicomponent analysis with symmetric line shapes: each Pt4f spectral c…
A luminescent diarylethene-functionalized platinum(II) diimine bis(alkynyl) complex displays interesting photochromic behavior with successful photosensitization by excitation into the 3 MLCT/LLCT excited state of this complex to trigger photocyclization.
Nine structural isomers of a tetrakis(arylethynyl)benzene chromophore functionalized with dibutylaniline and pyridine units as respective donors and acceptors have been synthesized and their steady-state spectroscopic parameters investigated. The effects of small structural variations on the electronic absorption and…
A structural transition at $T\approx 322$ K from the $Pmmm$ to $Pmma$ phase is found to coincide with an anomaly of resistivity. Another structural phase transition doubling the lattice parameter $c$, which has been postulated earlier to accompany a low-temperature magnetic transition in TbBaCo$_{2}$O$_{5.5}$, is obse…
The controlled growth of nanowires (NWs) with dimensions comparable to the Fermi wavelengths of the charge carriers allows fundamental investigations of quantum confinement phenomena. Here, we present studies of proximity-induced superconductivity in undoped Ge/Si core/shell NW heterostructures contacted by supercondu…
A negative capacitance has been observed in a nano-colloid between 0.1 and 10^-5 Hz. The response is linear over a broad range of conditions. The low-omega dispersions of both the resistance and capacitance are consistent with the free-carrier plasma model, while the transient behavior demonstrates an unusual energy s…
We present a simple model for electron transport in semiconductor devices that exhibit tunneling between the conduction and valence bands. The model is derived within the usual Bloch-Wannier formalism by a k-expansion, and is formulated in terms of a set of coupled equations for the electron envelope functions. Its co…
The colossal electroresistance in manganites is a concomitant of the electric field induced insulator-to-metal phase transition. A phenomenological phase transition model is proposed to study this electric field induced collapse of charge-ordered phase. The hysteresis of the phase transition is well explained using th…
A new bosonic, excitonic method for interacting electrons is developed. For two-dimensional electron liquid, it reveals a noncompensated quantum crystal phase ranging from the high density, or vanishing Coulomb interaction, limit: $r_s=0$, to a lower density $r_s\sim 10$, where a condensation of exciton pairs and the…
The stability and rheology of tricaprylin oil-in-water emulsions containing a mixture of surface-active hydrophilic silica nanoparticles and pure nonionic surfactant molecules are reported and compared with those of emulsions stabilized by each emulsifier alone. The importance of the preparation protocol is highlighte…
A superparamagnetic iron oxide (SPIO) nanoparticle is emerging as an ideal probe for noninvasive cell tracking. However, its low intracellular labeling efficiency has limited the potential usage and has evoked great interest in developing new labeling strategies. We have developed fluorescein isothiocyanate (FITC)-inc…
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Abstract The pressure behavior of the ultraviolet (UV) and green emission bands in ZnO tetrapod‐like micro‐rods has been investigated at 300 and 70 K, respectively. The pressure coefficient of the UV band at 300 K is 24.5 meV/GPa, consistent with that of the band gap of bulk ZnO. However, the pressure coefficient of t…
Abstract The galvanomagnetic effects in the n‐Pb 1– x Sn x Te:Ga ( x = 0.21) and n‐Pb 1– y Ge y Te:Cr ( y = 0.10) alloys at temperatures 4.2 ≤ T ≤ 300 K and under hydrostatic compression up to 17 kbar have been investigated. It is found that in almost the whole investigated pressure range in the samples investigated t…
Oxygen vacancies are shown by STM to play a fundamental role in the stabilization of complex anions on an oxide surface at elevated temperatures. By increasing the temperature in the range 120–420 K, sulfite is transformed into sulfate on a TiO2(110) surface, and there is a change in the adsorption site which seems to…
Abstract Low‐density polyethylene (LDPE) composites modified with a resin based on ethylene/methacrylic acid copolymer (surlyn) and/or citric acid were electron beam‐irradiated and investigated by electron spin resonance (ESR) at room temperature. ESR studies were carried out directly after irradiation and after vario…
Abstract The structure of Tb 2 Ti 2 O 7 pyrochlore was investigated at high pressures up to 24 GPa at cryogenic temperatures down to 6.5 K using angular dispersive X‐ray diffraction with synchrotron radiation at HPCAT, Advanced Photon Source. The cell parameters were obtained by performing full profile Rietveld refine…
Abstract Zinc butyl xanthate [Zn(bxt) 2 ] was prepared in the laboratory. The effect of this xanthate with zinc diethyl dithiocarbamate (ZDC) on the vulcanization of natural rubber (NR), polybutadiene rubber (BR), and NR/BR blend has been studied at different temperatures. The amounts of Zn (bxt) 2 and ZDC in the comp…
Abstract A family of supramolecular polymers was prepared via Cd 2+ ‐directed self‐assembly polymerization of bis(2,2′:6′,2″‐terpyridine)‐based ligand monomers, using oligofluorenes and triphenylamine as bridges under mild conditions. The polymers were fully characterized using thermogravimetric analysis, inherent vis…
Abstract Mesoporous thin films are prepared using a simple sol–gel technique. Using lithographically patterned (100)‐orientated substrates and a dip‐coating method reproducible alignment of the pores across the substrate surface can be obtained. The pores preferentially align parallel to the long side of the channels…