Materials Literature
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The ${\mathrm{PbZr}}_{x}{\mathrm{Ti}}_{1\ensuremath{-}x}{\mathrm{O}}_{3}$ (PZT) disordered solid solution is widely used in piezoelectric applications due to its excellent electromechanical properties. The disorder is caused by the random arrangement of B cations. To understand the relationship between properties of c…
Engineered domain configurations with different domain sizes were induced in [111]c oriented tetragonal barium titanate BaTiO3 single crystals, and their piezoelectric properties investigated as a function of domain size. Prior to this study, the dependence of domain configuration on temperature and electric field E w…
Aging and degradation of 345 kV ethylene propylene diene monomer (EPDM) transmission line insulators removed from service is presented. These suspension type insulators were installed in a New Hampshire coastal area in 1995 and were removed in 2000 after unexplained outages in that structure. The purpose of this paper…
ZnO tetrapods and ZnO nanorods were synthesized on ZnO nanocrystal substrates by a vapor transport process. The source materials were ZnCO3 powder and ZnO powder, respectively, which were reduced by graphite powder to yield different amounts of the vapor. The catalysts were ZnO nanocrystal layers prepared by successiv…
Abstract This study aims to explore the processing benefits and property improvements of combining nanocomposites with microcellular injection molding. The microcellular nanocomposite processing was performed on an injection‐molding machine equipped with a commercially available supercritical fluid (SCF) system. The m…
The miscibility, morphology, and crystallization behavior of the blend of poly(ethylene oxide) (PEO) and poly(butylene succinate) (PBS) have been investigated using differential scanning calorimetry, high-resolution solid-state 13 C NMR spectroscopy, and wide- and small-angle X-ray diffraction. PEO and PBS are found t…
Tissue engineering offers the opportunity to develop vascular scaffolds that mimic the morphology of natural arteries. We have developed a porous three-dimensional scaffold consisting of fibres of collagen and elastin interspersed together. Scaffolds were obtained by freeze-drying a suspension of insoluble type I coll…
Abstract The synthesis and properties are described of a ruthenium‐impregnated anodic aluminum catalyst for use in microreactors for the production of hydrogen from an ammonia feed. The catalyst structure was synthesized using microelectric discharge machining to create a series of 300 × 300‐μm posts on an aluminum su…
Commercial fabrication of field-effect transistors (FETs) using carbon nanotubes has been hindered as all current production procedures yield a mixture of metallic and semiconducting tubes. Herein, we present a generic approach utilizing electrochemistry for selective covalent modification of metallic nanotubes, resul…
The effect of block number on the order−disorder transition (ODT) and viscoelastic properties were studied for linear (AB) n multiblock copolymers. A series of symmetric poly(styrene- b -isoprene) n multiblocks ((SI) n, n = 1−10) were synthesized by anionic polymerization, and their order−disorder transition temperatu…
The effects of the carrier and pretreatment temperature on the oxidation state of Ce and Pt were evaluated in Pt/Al 2 O 3, Pt/CeO 2, and Pt/CeO 2 −Al 2 O 3 catalyst samples with various CeO 2 loadings by applying the following spectroscopic techniques to the samples: X-ray diffraction (XRD), X-ray photoelectron spectr…
A method of vapor phase codeposition has been used at elevated target temperature coupled with selective masking technique to produce a multicomponent optical material with seven different ultraviolet-visible optical active planes. Such a system consists of different nanocomposites of Teflon AF/Ag, Teflon AF/Au, and T…
We have measured the thermal conductivities of a 53-nm-thick and a 64-nm-thick tin dioxide (SnO2) nanobelt using a microfabricated device in the temperature range of 80–350 K. The thermal conductivities of the nanobelts were found to be significantly lower than the bulk values, and agree with our calculation results u…
We present Najm , a set of tools built on the axioms of absolute geometry for exploring the design space of Islamic star patterns. Our approach makes use of a novel family of tilings, called "inflation tilings," which are particularly well suited as guides for creating star patterns. We describe a method for creating…
Solid‐state synthesis of compositions from the Bi 2 O 3 –TeO 2 system show that, under an oxygen atmosphere, Te 4+ oxidizes to Te 6+ and yields four room‐temperature stable compounds: Bi 2 Te 2 O 8 , Bi 2 TeO 6 , Bi 6 Te 2 O 15 , and new a compound with the nominal composition 7Bi 2 O 3 ·2TeO 2 . Dense ceramics can be…
The rod of iron rules! Magnetic iron phosphide (Fe2P) nanorods (see picture) were synthesized through the thermal decomposition of a mixture of [Fe(CO)5] and trioctylphosphane that was continuously supplied by using a syringe pump. The size of the nanorods can be successfully controlled by subtle changes in the experi…
The reactions of acetaldehyde, acetic acid, and nitromethane with NO 2 on a BaNa−Y zeolite are monitored with FTIR spectroscopy, typically at 473 K. Isotopic labeling was used to help elucidate reaction pathways and intermediates. The mechanism that has been deduced for the reaction of NO 2 with acetaldehyde starts wi…
V-doped TiO2 thin films were grown by laser ablation on LaAlO3 substrates. In the chosen range of the growth conditions, all V:TiO2 films have an anatase structure and exhibit semiconducting and ferromagnetic behaviors at room temperature. V:TiO2 films have a giant magnetic moment and they seem to be far better ferrom…
A micro thin-film solid oxide fuel cell (TFSOFC) has been designed based on thin-film deposition and microlithographic processes. The TFSOFC is composed of a thin-film electrolyte grown on a nickel foil substrate and a thin-film cathode deposited on the electrolyte. The Ni foil substrate is then processed into a porou…
Abstract Summary: Additives that exhibit polyelectrolyte behavior such as N , N ‐dimethylformamide (DMF) may improve the electrospinning characteristics of viscoelastic polymer solutions. DMF additions to the solution lead to extensive jet splaying, thereby reducing the fiber diameter significantly. Nanofibrous struct…