Materials Literature
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To ensure the high quality of ultra-precision products such as semiconductors and optical microscopes, high-tech equipment used to make these products requires a normal working environment with extremely limited vibration. Some of high-tech industry centres are also located in seismic zones: the safety of high-tech eq…
This study examined the effect of addition on grain-boundary conductivity in -doped containing as an impurity. The addition of increased the grain-boundary conductivity times without affecting the grain-interior conductivity significantly. was incorporated into the lattice completely, which means that a scavenging rea…
The reaction of the pentadentate Schiff-base ligand 1,3-bis(salicylideneamino)-2-propanol (salproH3) with [Mn3O(O2CR)6(py)3] (R = Me, Et, But) gives the corresponding tetranuclear manganese product [Mn4O2O2CR)5(salpro)] (4Mn(III)). The syntheses, structure and magnetochemical characterization of these complexes are re…
A tripodal amido ligand with a central non-chelating phosphorus donor allows for the facile assembly of a pentane soluble organometallic copper cluster with a central copper atom surrounded by a nonplanar chain of eight copper atoms and two terminal amido-copper bonds.
A novel synergist immobilization photo-graft polymerization method has been developed to functionalize polymer materials in polar organic solutions. This two-step method, based on the immobilization of tertiary amine groups as synergists for the photoinitiator benzophenone (BP), had been evaluated for commercial hydro…
Recently we have developed the stereo-array isotope labeling (SAIL) technique to overcome the conventional molecular size limitation in NMR protein structure determination by employing complete stereo- and regiospecific patterns of stable isotopes. SAIL sharpens signals and simplifies spectra without the loss of requi…
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…