Materials Literature
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The hydrogen desorption properties of commercial nanocrystalline magnesium hydride (Tego Magnan ® from Degussa–Goldschmidt) processed by controlled mechanical milling (CMM) are investigated. A profound effect of the powder particle size on the hydrogen desorption characteristics has been observed. The onset ( T ON ) a…
We describe interlayer force measurements during prolonged, cyclic telescoping motion of a multiwalled carbon nanotube. The force acting between the core and the outer casing is modulated by the presence of stable defects and generally exhibits ultralow friction, below the measurement limit of $1.4\ifmmode\times\else\…
The thermal conductivity of individual multiwalled carbon nanotubes was measured by utilizing the four-point-probe third-harmonic method, based on the fact that the third harmonic amplitude and phase as a response to applied alternate current at fundamental frequency, omega, can be expressed in terms of thermal conduc…
CuO nanocrystals with different shapes, i.e. irregular nanoparticles, nanobelts and nanoplatelets, have been synthesized by controlling a few critical synthesis parameters to explore their catalytic properties. It was found that the rate of CO oxidation on the nanoplatelets is over six times higher than that on the na…
Single-crystal K(2)ZnCl(4) doped with Co2+ has been grown successfully by use of the Czochralski technique. The absorption spectrum of the crystal was measured. The most intense line, centered at 650 nm, was associated with the transition (4)A(2)-->(4)T(1P), and a novel and important result that corporate transition (…
Silicon thin films with nanometer dimensions are increasingly being used in the electronic and nanotechnology industries. At such small scales, the continuum assumption is no longer valid and the interactions of the energy carriers (phonons) with the boundaries affect the thermal conductivity of the films. For semicon…
The paper introduces a methodology that through a probabilistic characterisation of load for MV network, and implementing a life model for combined electric and thermal stresses, simulates the process of ageing of the insulating materials evaluating the expected life time of the cable. Such evaluation is necessary to…
This paper presents a study and experimentation of a hybrid energy storage system prototype, based on compressed air, where the charging and discharging is done within maximum efficiency conditions of the volumetric machine. As the maximum efficiency conditions impose the level of the converted power, an intermittent…
Due to the surface smoothness of micromachined structures, strong adhesion forces between these fabricated structures and the substrate can be developed. The major adhesion mechanisms include capillary forces, hydrogen bonding, electrostatic forces and van der Waals forces. Once contact is made, the magnitude of these…
A prototype energy-harvesting thermoelectric generator (TEG) is being designed, fabricated and tested to provide power for wireless sensors used in health monitoring of Navy ship machinery. TEGs utilize the heat transfer between shipboard waste heat sources and the ambient air to generate electricity directly and with…
Owing to their extraordinarily high thermal conductivities, carbon nanotubes (CNTs) are promising for use in advanced thermal interface materials (TIMs). While there has been much previous research on carbon nanotube thermal properties, there are little data for aligned films of single wall nanotubes. This paper measu…
We present the optical conductivity, infrared- and Raman-active charge-sensitive phonon modes, and the x-ray diffraction superlattice spots of β''-(ET)(TCNQ) [ET = bis(ethylenedithio) tetrathiafulvalene, TCNQ = 7,7,8,8-tetracyanoquino-dimethane], which is characterized as a quarter-filled narrow band system. Above ∼17…
Amorphous carbon-nickel composite films, which constitute a homogeneously mixed phase of carbon and 10% nickel, are prepared by UV pulsed laser ablation. From the low temperature conductivity study of these films, a nearly activated conduction followed by conductivity saturation below a temperature of 25K has been ide…
There is a growing trend in medicine toward minimally invasive surgery, and with it comes an increasing need for precise miniature instruments to achieve accurate positioning for complex procedures. Catheter-based surgeries in particular suffer from a lack of active steering of the interventional device. We present a…
This paper presents a study on the development and control of a micro biped walking robot using shape memory alloys (SMAs). We propose a flexible flat plate (FFP) consisting of a polyethylene plate and SMAs. Based on a detailed investigation of the properties of the SMA-based FFP structure, we develop a lightweight mi…
Conductive filler-polymer composite materials have been extensively investigated as conductor-insulator percolative system to achieve high dielectric constant (K). Additionally, the effective dielectric constant of conductive filler/polymer composite can be dramatically enhanced by increasing the dielectric constant o…
A simple imaging geometry in which total internal reflection in a glass prism is frustrated by the proximity of a metal surface is implemented for observation of surface plasmon resonance. At a certain angle of incidence, the total internal reflection is completely suppressed at a certain distance between the metal an…
Wafer processing induced residual stress in wafer level Cu interconnect structures can have a significant impact on reliability of Cu interconnects. In this study, a finite element analysis approach based on element birth and death technique was developed to simulate the wafer processing procedure. Residual stress in…
The state-of-the-art thermal interface materials (TIMs) for electronic cooling is briefly reviewed with an emphasis on the emerging trend of employing carbon nanotubes (CNTs) for enhanced thermal conduction across interfaces. Previous studies on CNT TIMs, however, indicated that despite the high thermal conductivities…
Sc doping enhances the B-site 1:1 cation ordering in the Pb(Mg1∕3Nb2∕3)O3 ceramic. At low doping levels, the electrical polar domains remain at the nanometer scale and the relaxor ferroelectric behavior persists. The electric field-induced relaxor to normal ferroelectric phase transition process was directly observed…