Materials Literature
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Varying the coinage metal in cyclic trinuclear pyrazolate complexes is found to significantly affect the solid-state packing, photophysics, and acid-base properties. The three isoleptic compounds used in this study are [[3,5-(CF3)2Pz]M]3 with M = Cu, Ag, and Au (i.e., Cu3, Ag3, and Au3, respectively). They form isomor…
The domain sizes and morphological boundaries in diblock copolymers have been predicted to be influenced by changes in the molecular weight distribution of one or both of the blocks. To systematically explore these effects, we prepared several sets of poly(ethylene- alt -propylene)- b -poly( dl -lactide) diblock copol…
One of the most significant barriers for enabling the breakthroughs promised by nanotechnology is mass production of nanoscale structures, devices, and systems. One of the main challenges of nanomanufacturing systems is three dimensional customized manufacturing of micro/nanofibers. In this article we present a specia…
Partial discharge (PD) measurements have long been used to assess the condition of the electrical insulation in motors and generators rated 3.3 kV and above. There are many ways to measure PD during normal service of the motor or generator. Unfortunately most of the measurement methods mix stator PD with electrical in…
In this paper we present a method for developing thick layers of silicon oxide. This work is divided into two parts. First we present the fabrication of the dielectric layer using porous silicon technology. In the second part we show the characterization of coplanar transmission lines deposited on it. In order to form…
Organic/inorganic optical nanocomposite with highly-doped rare-earth (RE) nanoclusters has been developed. The nanocluster, having RE-metal (RE-M) complex alkoxide structure (RE|M(OR)/sub 4/|/sub 3/), was designed to suppress nonradiative transitions due both to multi-phonon relaxation and concentration quenching whil…
The synthesis of the hydrophobic mesoporous silica (denoted as HMS(F)) was performed using tetraethyl orthosilicate (TEOS), tetraethylammonium fluoride (TEAF) as the source of the fluoride and dodecylamine (DDA) as templates. The TiO 2 loaded on the hydrophobic HMS(F) (TiO 2 /HMS(F)) exhibited the efficient photocatal…
We have performed theoretical studies of the solubility within Nb 2− x W x AlC by means of ab initio total energy calculations. If x is increased from 0 to 2 the bulk modulus can be increased by as much as 31%. The bulk modulus deviates from Vegard’s rule, which may be understood based on substitution-induced changes…
We have studied the structural, magnetic, and transport properties of ${\mathrm{Pr}}_{0.5\ensuremath{-}x}{\mathrm{Ce}}_{x}{\mathrm{Ca}}_{0.5}{\mathrm{MnO}}_{3}$ $(0.03\ensuremath{\leqslant}x\ensuremath{\leqslant}0.20)$ manganite system. The Ce substitution is found to induce significant modifications in these properti…
The structural phase transitions occurring at the first heating of as-grown Na 2 SO 4 (V) are so peculiar that there have been many controversial reports about them, especially with regard to the possible existence of several intermediate phases (II–IV) between the room-temperature (V) and high-temperature (I) phases.…
We study molecular diffusion in nanopores with different types of roughness under the exclusion of mutual molecular collisions, i.e., in the so-called Knudsen regime. We show that the diffusion problem can be mapped onto Levy walks and discuss the roughness dependence of the diffusion coefficients D(s) and D(t) of sel…
The thermal annealing effect on band gap and dielectric functions of silicon nanocrystals (nc-Si) embedded in a SiO2 matrix synthesized by Si ion implantation is investigated by spectroscopic ellipsometry. A large band-gap expansion of nc-Si relative to bulk crystalline silicon has been observed. The band gap of the n…
A supercooled liquid is said to have a kinetic spinodal if a temperature ${T}_{\mathrm{sp}}$ exists below which the liquid relaxation time exceeds the crystal nucleation time. We revisit classical nucleation theory taking into account the viscoelastic response of the liquid to the formation of crystal nuclei and find…
Ab initio total-energy calculations are presented for intrinsic defects in GaAs with a particular emphasis on hyperfine interactions in order to clarify the atomic structure of the various ${\mathrm{As}}_{\mathrm{Ga}}$-related defects. For the ${\mathrm{As}}_{\mathrm{Ga}}\text{\ensuremath{-}}{X}_{2}$ defect complex th…
This paper reports the fabrication technique of a novel carbon nanotubes (CNTs) based MEMS pressure sensor with piezoresistive gauge factor potentially much greater than polysilicon based sensors. By using the dielectrophoretic (DEP) nanoassembly of CNTs and a MEMS-compatible process, we have successfully integrated b…
The temperature variation of the electrical resistivity ρ and the Seebeck coefficient S of Heusler-type Fe2VAl1−xSix (0≤x≤1) alloys has been investigated. We have shown that the transport parameters are very sensitive to doping. For the x = 0 sample, high values of ρ and negative temperature coefficient of resistivity…
We report ensemble Monte Carlo transport simulation results for single-wall semiconducting zigzag carbon nanotubes. The effects of electron scattering by radial breathing mode phonons are investigated. The basis for the Monte Carlo simulations is provided by electronic structure calculations in the framework of the ti…
Nanostructured, heterogeneous, chiral Diels−Alder catalysts that are entirely organic in nature were prepared by synthesizing a polymerizable chiral imidazolidinone derivative (1). Acidification of 1 simultaneously activates the catalyst and allows the molecule to form different lyotropic liquid crystal phases. Subseq…
An axiperiodic quasistatic model to evaluate the magnetic flux density distribution and power loss due to curvature-related radial flux in the laminated core of axial flux machines is presented. It is shown that the relatively low effective permeability in the radial direction and the shielding effect of induced eddy…
The theme of this paper is the design of portable electronic systems for hot and humid conditions. In particular, portable products such as mobile phones. CD players and digital cameras can experience high relative humidity and condensation. It is important to understand the behaviour of portable products in different…