Materials Literature
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“Equatorial” energy transfer: Orientation control of intramolecular energy transfer (EnT) is found in the donor–acceptor system shown, light absorbed by the “peripheral” anthracene is efficiently transferred to the porphyrin, but that by the “axial” anthracene subunits is not.
Electrical and hydrophilic properties of TiOx films obtained by plasma enhanced chemical vapor deposition (PECVD) were investigated in connection with OH group content of the films. A microcrystalline TiOx film prepared by rf magnetron sputtering deposition (RFMSD) was used as a reference sample in this study. Compare…
The synthesis of 13 discotic mesogens is described in which the well-known hexakis(pentyloxy)triphenylene liquid crystalline material has been chemically modified to incorporate one, two, three and six carbazole moieties. These modifications have been achieved by the alkylation or esterification of mono-, di-, tri- an…
The damped harmonic oscillator model for thermal conductivity of insulators is improved, leading to a formula that predicts thermal conductivity at ambient conditions (k 0 ) from various physical properties, most of which are commonly measured. Specifically, k 0 = [ρ/(3ZM)] C v [(u P + u s )/2] 2 / <Γ>, where ρ…
Antiferromagnetic coupling between ferromagnetic layers has been observed for the first time in an all-semiconductor superlattice structure EuS/PbS(001), by neutron scattering and magnetization measurements. Spin-dependent superlattice band structure effects are invoked to explain the possible origin and the strength…
A simple route to the fabrication of multilayer films containing Pd nanoparticles is described. Following layer-by-layer assembly of PdCl 4 2 - and polycation, QPVP−Os (a quaternized poly(4-vinylpyridine) complexed with [Os(bpy) 2 Cl] 2+/+ ), on 4-aminobenzoic acid-modified glassy carbon electrodes, the three-dimensio…
The resistivities of copper (Cu) thin films and damascene Cu fine lines were precisely measured by utilizing Matthiessen's rule. It was shown that this measurement method can produce reliable values without requiring precise and detailed line-dimension measurements. It was found that the increase in resistivities of t…
Ibuprofen microcrystals sized between 25–45 μm have been encapsulated with various types of polyelectrolyte multilayers (PEMs) constructed with polyallylamine (PAH), polyethylenimine (PEI) or poly(4-vinylpyridine) (P4VP) as polycations and polystyrenesulfonate (PSS), polyanetholesulfonate (PAS) and dextran sulfate (DE…
Clay minerals share a basic set of structural and chemical characteristics (e.g. they are largely aluminosilicates with layer structures) and yet each clay mineral has its own unique set of properties that determine how it will interact with other chemical species. The variation, in both chemistry and structure, among…
Results are presented for flame synthesis of metal-catalyzed carbon nanotubes. A thermal evaporation technique is used to create the catalyst nanoparticles of Fe or Ni through gas condensation followed by entrainment into the flame. Results are compared with those using a high-temperature tube furnace to provide the r…
The present critical review examines the status of the research on supported, size-selected clusters with specific emphasis on their size-dependent physical and chemical properties. We describe the most relevant experimental methods with their advantages and drawbacks for the production of size-selected clusters and l…
Carbon nanotubeshave many advantages over conventional semiconductor and metal emitters for field emission displays (FEDs). However, the origin of the current saturation seen in carbon nanotubes at high fields is poorly understood. Here the effect of gas adsorbates on the field emission properties of patterned carbon…
Water soluble graft polymers prepared by copolymerization of either methacrylic acid (MAA) or vinylsulfonic acid (VS) with α-methoxy-ω-methacroyl-oligo(oxyethylene)s (PEOn-MA) serve to control nucleation and crystal growth during precipitation of inorganic crystals from aqueous media. Precipitation of zinc oxide cryst…
Deformation of polycrystalline Ti2AlC under room and high temperature compression was investigated. The results demonstrated that Ti2AlC was damage tolerant at room temperature and the samples were shear fractured upon failure. At high temperatures Ti2AlC deform plastically. The brittle-to-ductile-transition temperatu…
Driven by prospective applications, there is much interest in developing materials that can perform specific functions in response to external conditions. One way to design such materials is to create systems which, in response to external inputs, can self-assemble to form structures that are functionally useful. This…
As MRI contrast agents, more hydrophobic molecules reportedly accumulate in the liver and thus are potentially useful as liver MRI contrast agents. In this study, a generation-4 polypropylenimine diaminobutane dendrimer (DAB-Am64), which is expected to be more hydrophobic than the generation-4 polyamidoamine dendrimer…
The structure of mitochondrial pyruvate dehydrogenase kinase isozyme 2 is of interest because it represents a family of serine-specific protein kinases that lack sequence similarity with all other eukaryotic protein kinases. Similarity exists instead with key motifs of prokaryotic histidine protein kinases and a famil…
Abstract Carboxylated acrylonitrile‐butadiene rubber (CNBR)–clay mixtures were prepared by co‐coagulating rubber latex and clay aqueous suspension, then combining the mixtures with a rubber ingredient and vulcanizing by a traditional rubber mixing processing procedure. Transmission electron microscopy (TEM) showed tha…
Duplex stainless steels were aged at low temperatures (∼ 400°C) for a long time (2000–5000 hours). Optical microscopy does not show any differences in the microstructure, but the corrosion resistance is very affected by the heat treatment, despite the fact that the polarization curves are very similar for all analyzed…
The possibility of obtaining a detailed picture of the electronic structure makes surface photovoltage spectroscopy (SPS) eminently suitable for bridging the gap between the chemical, physical, optical and electrical properties of semiconductors. In SPS, changes in band bending (both at the free semiconductor surface…