Materials Literature
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This paper discusses the device physics of carbon nanotube field-effect transistors (CNTFETs). After reviewing the status of device technology, we use results of our numerical simulations to discuss the physics of CNTFETs emphasizing the similarities and differences with traditional FETs. The discussion shows that our…
The paper describes an algorithm for the generation of random packings of ellipsoids of revolution, which is a natural generalization of an older algorithm for the case of spherical particles and belongs to the class of collective rearrangement algorithms. It yields packings with a broad spectrum of densities and geom…
Abstract Summary: The comfort in wear of textiles has been studied extensively on the level of textile construction. The influence of the fibre material is present in the experience of textile consumers, but objective assessment is rather difficult. Some recent works are reviewed here. TENCEL® is a man‐made cellulosic…
During transport or the storage, galvanized steel products undergo wet storage stain phenomenon, leading to the formation of an extensive white rust of zinc. The corrosion products are mainly zinc layered hydroxides salts of which allow several intercalation or coprecipitation reactions allowing the easy absorption of…
Conducting polyaniline (PANI) has been synthesized using Sol-gel technique with chemical oxidation process. Chemically prepared cadmium sulphide has been printed on pellet of conducting polyaniline using screen-printing technique. I-V characteristics of conducting polyaniline and CdS printed conducting polyaniline hav…
Abstract Summary: Pristine FH is incorporated into a PS matrix by melt blending with and without latex precompounding of PS and FH. Direct melt blending results in microcomposites, whereas the latex‐mediated (masterbatch) technique results in PS/FH nanocomposites. The tensile creep response of the micro‐ and nanocompo…
Abstract Plasma deposition of conjugated polymer films under atmospheric pressure is described. Three thiophene derivatives (thiophene, 3‐methylthiophene, and 3,4‐ethylenedioxythiophene) are used as monomers. The plasma depositions with the various precursors are compared using analytical techniques such as X‐ray phot…
A new class of photoremovable protecting groups, based on a photoinduced decarboxylation reaction coupled with the elimination of the caged molecule, is described for 2-phthalimido-3-hydroxy-propionate derivatives. When derived from enantiopure N-phthaloyl- serine or threonine, the chirality of the starting amino acid…
Abstract This review is concerned with the synthesis and physical-chemical characteristics of a specific type of modified clay material: Ti-PILCs. The two general synthetic procedures and the main problems associated with the scale-up synthesis of these pillared materials are discussed in detail. The general character…
New findings give further information on the mechanism of carbon monoxide selective oxidation over γ-alumina supported nanoparticle sized gold catalysts. a) CO 2 formation, increasing with rising temperature, is observed in the absence of hydrogen and oxygen pointing to a model of active sites consisting of an ensembl…
Actuation behavior of diaphragm-type microactuators utilizing Ti-47.3Ni shape memory alloy (SMA) thin films heat-treated at 773, 823, and 873 K is investigated. The microactuators heat-treated at 773 and 823 K are successfully actuated at room temperature by the R-phase transformation only. This is because the R-phase…
Free-standing pyramidal Cu nanoparticles have been synthesized in large quantities (over 70%) on Au surface by using electrodeposition process. FESEM images reveal that the edge lengths of Cu pyramidals range from 100 to 800 nm. TEM measurements show that they are crystallized in face-center-cubic. Interestingly, thes…
We combine a right-handed (RH) and a left-handed (LH) nonlinear transmission line (NLTL) to realize a new frequency and phase-tunable bandpass filter (BPF). An RH NLTL is a voltage-controlled low-pass fiter and an LH NLTL is a voltage-controlled high-pass filter, so combining both allows for simultaneous and independe…
ZnO is attracting intensive attention for its versatile applications in transparent electronics, UV emitter, piezoelectric devices, chemical sensor and spin electronics. As one of the direct wide band gap semiconductors, it has advantages over GaN due to its larger exciton binding energy, better lattice match on heter…
The aim of molecular modeling is to mimic reality by considering approximations appropriate to the scale at which the simulation is carried out. At the atomic level, forcefields that represent average atomic interactions are used. However, the phase space has to be adequately explored in order to compare successfully…
Abstract In this work hybrid latexes of poly(styrene‐co‐butyl acrylate)/montmorillonite were synthesized via miniemulsion polymerization using a Brazilian organically modified montmorillonite. The natural clay was previously treated with Cetyltrimethyl ammonium chloride (CTAC) in order to increase the interaction betw…
The reaction of trimethylaluminum and dry, high-surface-area (500 m2/g) silica gel in a mixed slurry was studied using multinuclear, solid-state NMR spectroscopy. The products of the initial reaction were characterized, and their progress through subsequent washing with diethyl ether and reactions with measured amount…
The local dynamics of syndiotactic poly(methyl methacrylate) (PMMA) are investigated by explicit atom molecular dynamics (MD) simulations and quasielastic neutron scattering at temperatures well above the glass transition temperature. Using MD, we are able to isolate specific local motions well above T g . These inclu…
A new bialkali alanate K2LiAlH6 was synthesized at 320-330 degrees C and 100-700 bar. It was structurally characterized by powder X-ray diffraction. It crystallizes in space group R3m (No. 166) with unit cell parameters a = 5.62068(8) and c = 27.3986(6) A. The Li and K cation sites are mutually exclusive, and Rietveld…
Various parameters affecting the performance of bulk thermoelectric (TE) modules used for integrated circuit (IC) thermal management are studied. An effective circuit model is developed that takes into account various ideal and nonideal effects in the module. It is shown that there is an optimum module thickness and a…