Materials Literature
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We present a comprehensive study relating the magnetic properties to structural properties of Mn+-implanted Si1−xGex films as a function of Ge content (x=0–0.5). Ferromagnetic ordering with three critical temperatures, TB∼10–16K, TC1∼650–780K, and TC2∼825–860K, are reported in this material system. Element specific x-…
Fluorescent quantum dots have been used in biological applications as desirable fluorescent labels instead of traditional fluorophores. Incorporation into microspheres enhances many features of quantum dots that make them ideal for biological detection, such as photostability, multi-target, and improved brightness. Qu…
An individual multiwall carbon nanotube (CNT) synthesized without a catalyst by an arc discharge method is bonded to a tungsten tip. Field emission characteristics of the individual CNT coated with a boron nitride (BN) nanofilm are investigated. The BN film is synthesized by plasma-assisted chemical vapor deposition m…
Chemically sprayed fluorine-indium-doped zinc oxide thin films (ZnO:F:In) were deposited on glass substrates. A mixture of zinc pentanedionate, indium sulfate, and fluoride acid was used in the starting solution. The influence of both the dopant concentration in the starting solution and the substrate temperature on t…
Abstract The effect of surface compressive residual stresses (RS) induced by surface grinding and polishing on the gigacycle fatigue behavior of medium‐carbon high‐chromium alloy cold work tool steel was evaluated. Two test series were performed: Specimens of series I revealed high compressive RS of about ‐800 MPa at…
Looking to the development of sustainable and low impact chemical technologies, water based paints offer significant advantage especially for in field applications, where the problem of solvent emission is really stringent. Some water based coatings are represented by alkyd and epoxy paints, capable of cross-linking e…
Well-ordered mesoporous silicas SBA-1 (cubic Pm 3 n symmetry) functionalized with phenyl groups have been synthesized via co-condensation of tetraethoxysilane (TEOS) and phenyltriethoxysilane (PhTES) under acidic conditions. The synthesis parameters such as temperature, type of surfactant, and synthesis composition ha…
Abstract To prepare polymer/carbon nanotube composites, polycarbonate was chosen to modify multiple‐walled carbon nanotubes. Poly[(propylene oxide)‐(carbon dioxide)‐(ε‐caprolactone)], poly(butylene‐co‐ε‐caprolactone carbonate), and poly[(propylene oxide)‐co‐(carbon dioxide)‐co‐(maleic anhydride)] were the polycarbonat…
The electrical properties of carbon nanotube FETs (CNTFETs) have been studied in detail. The conduction type of the CNTFETs was dependent on the work function of the contact metal, which suggests that Fermi level pinning at the metal/nanotube interface does not happen. Based on the two-probe and four-probe resistance…
The present work reports the effect of reaction time on solvothermal synthesis of copper sulfides from CuCl2 x 2H2O and thiourea with various compositions and morphologies using ethylenediamine as solvent at 120 degrees C. X-ray diffraction patterns of the products at different durations shows the development of diffe…
The paper describes current developments for upgrading of existing AC transmission lines for substantial increase in power transfer capacity by a new concept of conversion to HVDC transmission. Traditionally, such a conversion has been contemplated as being three phase AC to bipolar DC. Recent patents by one of the au…
The use of field emitter arrays (FEA) in XHV partial or total pressure measurement so far did not pass the laboratory stage. The reasons are costly manufacturing in comparison to thermionic cathodes and the susceptibility of microtip cathodes to degradation at higher pressures. Today, electron sources based on carbon…
The metabolic pathway of primary carbon fixation was studied in a peculiar pennate marine diatom, Haslea ostrearia (Bory) Simonsen, which synthesizes and accumulates a blue pigment known as "marennine". Cells were cultured in a semi-continuous mode under saturating [350 µmol(photon) m-2 s-1] or non-saturating [25 µmol…
This paper deals with the fatigue behaviour of NiTiCu shape memory alloy (SMA) wire actuators on thermo-mechanical cycling (TMC). Cyclic loading in SMA actuators is invariably associated with both functional and structural fatigue. The characteristic of the actuators such as austenite (hot shape) remnant deformation a…
The development of modern engines involves the use of new materials such as diamond-like carbon (DLC) coatings. As these coatings possess different mechanical and physical characteristics to steel, investigation of their friction and wear properties when rubbing against a steel counterpart in a lubricated environment…
Four-probe resistivity measurements were performed on the TMTTeN crystal by using a diamond anvil high-pressure cell up to 30 GPa. The crystal could not be metallized though the room-temperature resistivity decreased to a very small value (1.5 x 10-3 Omega cm). Although single-component molecular metals are composed o…
The lack of a low cost, high volume method to produce carbon nanotubes has greatly limited their commercialization. Carbon nanofibers have a similar structure and properties as nanotubes and are a commercially viable alternative to them. In recent years many of the difficulties of commercial nanofiber production have…
Carboxylmethyl starch sodium-coated magnetic nanoparticles (CMS@MNs) with average size of 10 nm were synthesized by chemical coprecipitation. Cellular iron content showed that CMS@MNs could be efficiently uptaken by human hepatoma cells. TEM image showed that clusters consisting of nanoparticles were enclosed within s…
An integrated theoretical model has been developed to predict the entire range of emission from thermionic to field emission, including the mixed emission regime. The model assumes a Sommerfeld free electron model supply function, for which the Fermi-Dirac distribution applies with a nonzero temperature. The electron…
Schiff base oligomer of N,N′‐bis (2,4‐dihydroxybenzylidene) 1,2‐phenylenediamine (DHBPDA), with a double azomethine group, was synthesized from the oxidative polycondensation (OP) reaction with NaOCl as an oxidant in an aqueous alkaline medium at 90°C. About 75% DHBPDA was converted to O‐DHBPDA. The structures of the…