Materials Literature
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The thermoelectric properties of a nonstoichiometric titanium oxide (TiO 1.1 ) are investigated in terms of materials for high-temperature thermoelectric conversion. The electrical conductivity σ of TiO 1.1 increases to 9000 S/m at 800 °C showing semiconducting behavior. The Seebeck coefficient α of TiO 1.1 shows a ge…
Phthalocyanines are an interesting class of aromatic macrocycles which possess unique physical and chemical properties that make them excellent building blocks for the construction of molecular materials. Among the different functional groups that can be incorporated into the phthalocyanine's skeleton, the alkynyl gro…
Ag1-xSnSb1+xTe3 presents a rare combination of large positive thermoelectric power response coexisting with an almost metallic carrier concentration. It is proposed that this unusual state arises from a high effective mass for the hole carriers which may derive from nanostructuring in the material.
Highly transparent and conductive thin films of SnO2:F and In2O3:Sn (ITO) have been prepared on glass substrates using the simple pyrolitic (spray) method. Through an exhaustive parameter study and using as diagnostic method for the film quality a figure of merit defined as a function of both, the transmittance and th…
Abstract Brazil is a significant producer of kaolin with almost 2.5 Mt in 2005 representing 10% of the world's total of 25.0 Mt. Brazil is now the second largest producer in the world, after the USA, having overtaken the United Kingdom in 2005. The kaolin resources are widespread throughout the country and are varied…
With increasing interest in nanotechnology, development of nanofibers (n-fibers) by using the technique of electrospinning is gaining new momentum. Among important potential applications of n-fiber-based structures, scaffolds for tissue-engineering represent an advancing front. Nanoscaffolds (n-scaffolds) are closer t…
Electrospinning is a method utilized to produce nano-scale fibers for tissue engineering applications. A variety of cells are attracted by nano scale surfaces and structures probably due to the similarity of their natural environment scale. In this study, diclofenac sodium (DS) releasing nanofibers were manufactured v…
When assembling planar solid oxide fuel cell (SOFC) stacks, an electrically insulating and gas-tight sealing material is required. Glass-ceramic sealants have been shown to be an appropriate material for this application in the past. In the present study, the investigations are focused on a composite material consisti…
Abstract The progress that has been achieved over the past few years on the growth of thick and high purity homo‐epitaxial single crystal diamond by chemical vapour deposition (CVD) has opened a wide range of possible applications in areas such as optics or power electronics. Recently, high quality single crystals wer…
The microstructure of the SmCo5 thin films sputter deposited on Cu underlayers was investigated to explain the high coercivity Hc. Energy filtered elemental map and energy dispersive x-ray spectroscopy line analysis showed that Cu diffused into the SmCo5 layer to form a Sm(Co,Cu)5 solid solution. Composition fluctuati…
We report the synthesis, characterization, and thermal behavior of 1,1-diethyl-3-(4-(3,3-diethylthioureidocarbonyl)benzoyl)thiourea, 1,1-di- n -propyl-3-(4-(3,3-di- n -propylthioureido carbonyl)benzoyl)thiourea and 1,1-di- n -butyl-3-(4-(3,3-di- n -butylthioureidocarbonyl)benzoyl)thiourea and their Ni(II), Cu(II), and…
Free amine chitooligosaccharides (FACOS, Kitto Life, Seoul, Republic of Korea) with an average molecular mass of 3.5 kDa were efficiently produced using an ultrafiltration membrane reactor system. To evaluate the effect of chitooligosaccharides on serum cytokine levels in elderly adults after oral intake, 5.1 g/day of…
DyMnO 3 single crystals of hexagonal modification were grown for the first time by zone melting, and their anisotropic magnetic properties were studied in detail. At T ∼ 7 K, a small uncompensated magnetic moment (∼1 μ B per formula unit) is shown to occur along the hexagonal axis. At temperatures 7–45 K, a transition…
Highly active and selective titania−silica epoxidation catalysts modified by MeSiO1.5 and Me3SiO0.5 groups were obtained in one step by a nonhydrolytic sol−gel process using low-cost chloride precursors and routine evaporative drying.
In this paper we report a new method for the electrochemical deposition of a metal/polymer composite layer on a conducting substrate. The electrochemical solution is a mixture of an acrylate (ethyl acrylate, EA; 2-phenyl-2-(2,2,6,6-tetramethylpiperidin-1-yloxy)ethyl acrylate, PTEA; 8-quinolinyl acrylate, 8QA), a metal…
The current–voltage and noise characteristics of bridging silicon wires have been measured at room temperature. From the linear current–voltage characteristics the bulk and contact resistance contributions are extracted and modeled. The excess noise observed at low frequencies is interpreted in terms of bulk and conta…
Using an ultrafast scanning microcalorimetry apparatus capable of heating rates in excess of 10(5) Ks, we have conducted the first direct measurements of thermodynamic properties of pure and doped amorphous solid water (also referred to as low density amorphous ice) in the temperature range from 120 to 230 K. Ultrafas…
The present article summarizes an experimental study on the mechanical and rheological behavior of high density polyethylene (HDPE)/jute composites. HDPE with short jute fibers of 6 mm length are melt-mixed employing Haake torque rheocord followed by compression molding. Various types of chemical treatments such as me…
Oxides in steel weld metals can initiate fracture or can improve toughness by influencing the development of beneficial microstructures. In this work, the authors conducted experiments in which the oxygen concentration was varied from 20 to 560 ppmw (parts per million by weight) in weld metals with tensile strength in…
Fluctuations (or drifts) in switching voltages such as programming set/reset voltages and threshold voltage pose serious obstacles to the reliable operation of electrical phase change memory devices. Using a phase change memory device having a GeSb2Te4 phase change material and TiN electrode, these fluctuations are de…