Materials Literature
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We have synthesized poly(3-hexylthiophene) (P3HT) from initiator monolayers covalently bound to TiO2 nanotubes fabricated inside nanoscale porous aluminum oxide templates. Much larger density of P3HT is achieved than by infiltration of the pores with P3HT synthesized outside the template. In addition, much lower photo…
Three-dimensional (3D) morphology of a polymer/clay nanocomposite, an organophilic montmorillonite (MMT) dispersed in poly(ethylene-co-vinylacetate) (EVA), was examined by transmission electron microtomography (TEMT). Using this technique, individual clay layers dispersed in the EVA matrix were clearly visualized. A v…
The electronic structure of CaCu3Mn4O12 and LaCu3Mn4O12 was investigated using a full-potential linearized augmented plane wave method within the Generalized Gradient Approximation (GGA). The ferrimagnetic and ferromagnetic states in these two compounds were investigated and the calculated spin magnetic moments were f…
A series of meso-to-meso ethynyl-bridged multiporphyrin arrays have been synthesized using Sonogoshira palladium-catalyzed cross-coupling reactions involving the appropriate ethynylporphyrin and iodoporphyrin precursors. The absorption spectra of these multiporphyrins show splitting of the Soret bands and significant…
We describe the operation of a light-emitting device in which silicon nanocrystals are electrically pumped via the field-effect electroluminescence (EL) mechanism. In contrast to the simultaneous bipolar carrier injection used in conventional p-n junction light-emitting diodes, this device employs sequential unipolar…
A compartmentalized {4 x[2 x 2]} Mn(II)16 antiferromagnetically coupled square grid results from the self-assembly reaction of a tetratopic pyridazine bis(hydrazone) ligand and Mn(II).
This paper focuses on the effects of the interface between epoxy resin and nano- or micro-scale silica filler. Experiments were carried out on epoxy resin containing nano- or micro-scale silica fillers (nano-composite or micro-composite) to investigate the effects of the epoxy/filler interface on the properties of wat…
High second-order susceptibility has been created in a chalcogenide glass from Ge-Sb-S system. A thermal poling process was used to produce this non-linear effect and a second harmonic generation experiment allowed characterizing the phenomenon. A maximum chi(2) value of 8.0+/-0.5 pm/V was measured for the first time…
The continuous miniaturization and reduction of power consumption in modern electronic devices enables and demands the employment of alternative energy sources. Primary batteries as well-established energy sources are excessive in weight and size, and limit the lifespan and autonomy of electronic devices because of th…
We report the direct preparation of mesoporous silica/carbon composites, mesoporous silica, and nanostructured carbon and silicon carbide materials from mesoporous ethyl-bridged organosilica/surfactant mesophases. Well ordered mesoporous silica/carbon composites, with surface area of ca. 820 m2 g−1 and pore volume of…
A new series of fluorophores, 5-methoxy-2-(2-, 3- or 4-pyridyl)thiazoles (2-, 3- or 4-MPT, respectively), were synthesized and their photophysical properties investigated. 2- and 4-MPT are highly fluorescent in polar solvents. Combined with theoretical calculations, studies of the excited state lifetimes in different…
We fabricated yttria stabilized zirconia (YSZ) thin films having submicrometer thickness without gas leakage to be incorporated in low-temperature solid oxide fuel cells (SOFCs). We obtained -thick YSZ films by oxidizing Y–Zr alloy thin films deposited onto anodic nanoporous alumina substrates having pore diameter of…
57Fe Mössbauer spectroscopy was used to study the reduction behavior at temperatures as high as 1073 K of an iron/silica catalyst, and also the carbonaceous materials isolated after acetylene decomposition over this catalyst at several temperatures (873-1073 K). The products were previously characterized by transmissi…
Electric double-layer capacitors (EDLC) using activated carbon as electrodes are practical electric energy storage devices for high power application. However, the common EDLC is limited by the low energy density (less than ). Here, we introduce a capacitor with much higher energy density (over ), in which graphitic c…
We have synthesized a range of montmorillonite-based clay–polymer nanocomposites by intercalation of a variety of functionalized molecules having poly(ethylene oxide) and poly(propylene oxide) backbones from aqueous solution using a facile batch process. We focus on montmorillonite clays charge-balanced by cation exch…
A DTPA-based chelate containing one phosphinate group was conjugated to a generation 5 polyamidoamine (PAMAM) dendrimer via a benzylthiourea linkage. The Gd(III) complex of this novel conjugate has potential as a contrast agent for magnetic resonance imaging (MRI). The chelates bind Gd3+via three nitrogen atoms, four…
A series of acrylic co-polymers and terpolymers from ethyl acrylate (EA), butyl acrylate (BA) and acrylic acid (AA) were synthesized by solution polymerization. Nanocomposite adhesives based on these acrylic polymers and silica or clay were prepared by sol–gel or solution blending techniques, respectively. The effect…
The effects of α-Si3N4 powder, β-Si3N4 seed particles and sintering conditions on the texture development in Si3N4 ceramics, which were prepared by slip casting in a strong field of 12 T, followed by pressureless sintering. In the case of the replacement of the fine powder (UBE SN-E10) with the coarse powder (UBE SN-E…
Efficient oxidation of Hantzsch 1,4-dihydropyridines with sodium periodate catalyzed by a polystyrene-bound manganese(III) porphyrin is reported. This catalyst shows high activity in the oxidation of various 1,4-dihydropyridines at room temperature. This heterogeneous catalyst can be reused five times without signific…
The N-ethyl pyrazine-bridged bis-1,2,3-dithiazolyl radical (R(1) = Et) associates at room temperature as a C-C bonded sigma-dimer which, on heating, converts to a laterally S-S sigma-bonded structure.