Materials Literature
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A concise review is given of the progress made in the field of partial discharges (PD) at DC voltage. Although ample reference will be made to work of other authors in this field, the paper will concentrate on the progress that was made at Delft University of Technology over a period of 14 years in three PhD projects.…
Partial discharge (PD) detection, measurement and classification constitute an important tool for quality assessment of insulation systems utilized in HV power apparatus and cables. The patterns obtained with PD detectors contain characteristic features of the source/class of the respective partial discharge process i…
Functionalization of carbon nanotubes (CNTs) is important for enhancing deposition of metal nanoparticles in the fabrication of supported catalysts. A facile approach for oxidizing CNTs is presented using a sonochemical method to promote the density of surface functional groups. This was successfully employed in a pre…
We examine the shape memory effect in polymer networks intended for biomedical, and specifically cardiovascular, applications. The polymers were synthesized by photopolymerization from a tert-butyl acrylate monomer with a diethyleneglycol diacrylate crosslinker. Three-point flexural tests were used to systematically i…
We present a study on the electronic behavior of films of as-prepared and purified single-walled carbon nanotubes (SWNTs) and demonstrate the important role that chemical functionalization plays in modifying their electronic properties, which in turn throws further light on the mechanism of action of SWNT-based sensor…
Metamaterials (MTMs), which are formed by embedding inclusions and material components in host media to achieve composite media that may be engineered to have qualitatively new physically realizable response functions that do not occur or may not be easily available in nature, have raised a great deal of interest in r…
Metalloporphyrins are exceedingly useful building blocks for the design and synthesis of molecularly based solids. The use of hydrogen bonding or metal ion coordination provides a wide range of framework solids. Using various polyfunctionalized porphyrins, we have created porous solids that are thermally robust and th…
There are substantial barriers to the introduction of hydrogen fuel cells for transportation, including the high cost of fuel-cell systems, the current lack of a hydrogen infrastructure, and the relatively low fuel efficiency when using hydrogen produced from hydrocarbons. Here, we describe a solid oxide fuel cell tha…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTArtificial Molecular RotorsGregg S. Kottas, Laura I. Clarke, Dominik Horinek, and Josef MichlView Author Information Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309-0215, and Department of Physics, North Carolina State University, Ra…
Since the use of magnetic nanocrystals as probes for biomedical system is attractive, it is important to develop optimal synthetic protocols for high-quality magnetic nanocrystals and to have the systematic understanding of their nanoscale properties. Here we present the development of a synthetically controlled magne…
In this paper, a new approach for the development of planar metamaterial structures is developed. For this purpose, split-ring resonators (SRRs) and complementary split-ring resonators (CSRRs) coupled to planar transmission lines are investigated. The electromagnetic behavior of these elements, as well as their coupli…
Thermal properties of nanowire and nanotube arrays and their composites formed by deposition in a nanochannel alumina matrix have attracted a great research interest due to possible applications in high efficiency thermoelectric energy conversion and thermal management. A photo-thermoelectric technique was employed re…
The article gives elements to answer a few questions: • Are Nanotechnologies a logical and rational continuation of Microtechnologies or do they represent a revolution in many aspects of Sciences and Technologies? • What are the conditions to be able to combine long term basic sciences and innovations which can be rap…
Multilayer monolithic microwave integrated circuit (MMIC) structures using polyimide as insulating dielectric layer has been utilised to demonstrate a range of MMICs. The polyimide layer formation, curing and dry etching processes have been investigated in an attempt to obtain high quality dielectric layers suitable f…
The origins of the tribological properties and corrosion resistance of amorphous and quasicrystalline approximant alloys have been studied by comparing their properties in thin Al-Cu-Fe alloy films with compositions lying near the quasicrystalline region of the ternary compositional phase diagram. Six sputtered thin f…
A multi-scale modeling approach is proposed and employed to investigate thermal issues in GaAs MMIC. Thermal analysis down to the signal transistor level was made possible with the development of this approach using the finite element technique. The multi-scale modeling results are then verified with an infrared tempe…
We report on the syntheses and characterizations of the magnetic title compounds and on their bulk and intergrain properties. Phase purity could be obtained only for the $x=1∕3$ compound ${\mathrm{Sr}}_{3}{\mathrm{Cr}}_{2}\mathrm{W}{\mathrm{O}}_{9}$ $({\mathrm{SCWO}}_{9})$, whereas the $x=0$ compound ${\mathrm{Sr}}_{2…
We have developed a fast multihit position and time sensitive detector with zero dead-time for heavy particles in the keV energy range. This new type of detector makes use of a micro-channel plates (MCP) assembly and combines a detection based on delay line anode with a simultaneous particle imaging with a CCD-camera.…
L-Vinylglycine (L-VG) is both a substrate for and a mechanism-based inhibitor of 1-aminocyclopropane-1-carboxylate (ACC) synthase. The ratio of the rate constants for catalytic conversion to alpha-ketobutyrate and ammonia to inactivation is 500/1. The crystal structure of the covalent adduct of the inactivated enzyme…
A free-volume theory is developed based on the defect diffusion model (DDM). In addition, positronium annihilation lifetime spectroscopy (PALS) ortho-positronium free-volume and intensity data are presented for poly(propylene glycol) with a molecular weight of 4000 (PPG 4000) in both the glassy and liquid states and d…