Materials Literature
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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…
The mechanism of CO oxidation reaction on oxygen-precovered Pt(111) surfaces has been studied by using time-resolved near-edge x-ray absorption fine structure spectroscopy. The whole reaction process is composed of two distinct paths: (1) a reaction of isolated oxygen atoms with adsorbed CO, and (2) a reaction of isla…
The field-dependent domain structure of a ${\mathrm{La}}_{0.7}{\mathrm{Sr}}_{0.3}{\mathrm{MnO}}_{3}$ thin film epitaxially grown on a ${\mathrm{LaAlO}}_{3}$ (001) substrate has been investigated at low temperatures by magnetic force microscopy. Due to the lattice mismatch, the ferromagnetic thin film is structurally d…
An approach is proposed to theoretically construct a realistic single-crystal GaN nanotube at atomic scale. The generated atomic structures of the single-crystal GaN nanotubes match the structural aspects from experiment very well. Our energetic calculations show that a single-crystal GaN nanotube with [100]-oriented…
X-ray and neutron diffraction techniques are combined with first-principles-based simulations to derive and understand the structural properties of $\mathrm{Pb}(\mathrm{Sc},\mathrm{Nb},\mathrm{Ti}){\mathrm{O}}_{3}$ (PSN-PT) near its morphotropic phase boundary (MPB). An analysis of our measurements yields, at room and…
The thermophysical properties of liquid Te, namely, density, electrical conductivity, and viscosity, were determined using the pycnometric and transient torque methods from the melting point of Te (723 K) to approximately 1150 K. A maximum was observed in the density of liquid Te as the temperature was increased. The…
Under similar test conditions, the electromigration reliability of Al and Cu metallization interconnect trees demonstrates significant differences because of the differences in interconnect architectural schemes. In Cu technology, the low critical stress for void nucleation at the interface of the Cu and the inter-lev…
The electronic properties of Li doped single-wall carbon nanotubes were studied by high-resolution photoemission spectroscopy. Upon Li intercalation, the limited displacement of the Fermi level agrees with a partial charge transfer of the Li2s electron to the $\mathrm{C}2p\text{\ensuremath{-}}{\ensuremath{\pi}}^{*}$ s…
A Raman and photoluminescence study of a thermally annealed free-standing film of silica containing Si nanocrystals is reported. The laser-induced thermal effects are observed, including the increase of the absorption coefficient and the strongly nonlinear rise of the light emission. The light emission measured at hig…