Materials Literature
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In this paper we use spectroscopic ellipsometry to investigate the optical properties of silicon quantum dots (Si-QDs) embedded in silicon-rich silicon nitride (SRSN) films over the (1.5–5.9 eV) photon energy range. These films were elaborated by microwave plasma enhanced chemical vapor deposition for various gas flow…
Cobalt ferrite thin films were grown on SiO2/Si(100) substrates using pulsed-laser deposition technique at substrate temperatures ranging from 250 to 600 °C. Thermal expansion mismatch between the film and substrate appears to have a substantial effect on the magnetic properties of the cobalt ferrite films, due to the…
We perform first-principles calculations to investigate the geometric and electronic properties of (10,0) and (5,5) BN/C nanotube heterostructures. We show that both of them have smooth interfaces which are free from bond mismatch and vacancy defect. Interface states appear in the band gaps, due to the discontinuity o…
We investigated the effect of Bi doping on magnetic and magnetocaloric properties of La0.7−xBixSr0.3MnO3 (x=0.0–0.4). It is shown that the low temperature ground state changes from a ferromagnet (x=0) to a charge-ordered antiferromagnet for x=0.4. While the paramagnetic-ferromagnetic (PM-FM) transition is second-order…
A ternary intermetallic compound poses even greater production difficulties, since three elements have to be mixed intimately, instead of two, for the product to be uniform in chemical composition. Furthermore, the three elements must react simultaneously to prevent binary intermetallics forming by reaction between on…
Hypoeutectic 16%Cr cast irons, both Mo free and 1–3%Mo containing specimens were prepared to investigate their abrasion wear behaviour. Annealed specimens were hardened at 1323 K and then tempered at three temperatures from 673 to 873 K for 7·2 ks, the temperature giving the maximum hardness (HTmax) and the lower and…
Porphyrins with different numbers of β-propionate chains mimicking natural porphyrins were prepared via the 2+2 MacDonald type approach. Photodynamic activity against WiDr colon adenocarcinoma cells showed that activity is related to the number of β-propionate chains, with the derivatives with two carboxylic groups sh…
Abstract The accidental injury by medical needles, even when wearing personal protective clothing, is a growing concern for an increasing number of workers. Therefore, an effort has been undertaken to study the interaction of medical needles with materials relevant to protective gloves. A first phase of the project ha…
A series of (Ca0.9Gd0.1)3Co4O9/xAg(x=0, 0.1, 0.15, 0.2) ceramics were prepared by a polyacrylamide gel method and Spark Plasma Sintering. Scanning electron microscopy (SEM) revealed that small size Ag particles were dispersed into the (Ca0.9Gd0.1)3Co4O9(CGCO) matrix. The electrical conductivity of the composites was o…
We propose a sensing mechanism for detection of analytes that can specifically recognized. The sensor is based on closely-spaced chains of functionalized gold nanoparticles (NPs) immobilized on a waveguide surface, with the signal detected by evanescent waveguide absorption spectroscopy. The localized surface plasmon…
Abstract Defects in a nitrogen implanted and thermally annealed zinc oxide thin film ( n ‐type conducting) and reference samples were studied. Space charge regions realised by fabrication of semitransparent palladium Schottky contacts enabled the application of capacitance spectroscopic methods and photo ‐ current mea…
The microstructural changes of Nd-rich interface phases during postsintering annealing were investigated. A mixture of very fine (about 2–3 nm) crystallites of hexagonal h-Nd2O3, cubic Ia3¯-Nd2O3 (C-Nd2O3), and amorphous phases were observed at the interface phase in the as-sintered magnet and after the first postsint…
A new type of transmission-line resonator is proposed. It is composed of a finite-long straight nonreciprocal phase-shift composite right/left handed transmission line, and both terminals are open or shorted. On the contrary to conventional transmission-line resonators or traveling-wave resonators, the resonant freque…
Effect of homogenization of the chemical composition and crystal structure on the magnetocaloric effects have been studied for bulk Mn1.1Fe0.9P0.8Ge0.2 alloy prepared by mechanical alloying and subsequent spark plasma sintering method. After optimal homogenization treatment, the ferromagnetic impurity, Ge6Fe3Mn4 phase…
To gain a deeper understanding of the physicochemical phenomenon of self-assembled nanoparticles of different generations and ratios of poly (amidoamine) dendrimer (PAMAM) dendrimer and a short-stranded DNA (antisense oligonucleotide), multiple methods were used to characterize these nanoparticles including photon cor…
Shape memory alloys (SMAs) have been actively studied in many fields utilizing their high energy density. Applying SMA wire-embedded composite to aerospace structures, such as air intake of jet engines and guided missiles, is attracting significant attention because it could generate a comparatively large actuating fo…
We report the first demonstration of surface-enhanced Raman spectroscopy (SERS) detection of para-mercapto benzoic acid (pMBA) and surface-enhanced resonance Raman spectroscopy (SERRS) detection of brilliant cresyl blue (BCB) and cresyl violet perchlorate (CVP) with continuous-wave excitation from a stand-off distance…
Polymeric micelles are frequently used to transport and deliver drugs throughout the body because they protect against degradation. Research on functional polymeric micelles for biomedical applications has generally shown that micelles have beneficial properties, such as specific functionality, enhanced specific tumor…
Heteroatome kontrollieren den Aufbau nanoskaliger Heteropolyoxowolframate: Namentlich SeO32− führte zur Bildung von [H2W43Se3O148]24−{W43Se3}, [H4W77Se5O265]44− {W77Se5}, [H6W63Se6O221]34− {W63Se6} und [H8W100Se16O364]56− {W101Se16}. Alle diese Clusteranionen leiten sich von einem gemeinsamen {W22Se2}-Baustein ab und…
The food packaging industry demands polymer films possessing a defined barrier against permeation of gases, moisture and flavor. The objective of this study was to assess the differences between the barrier properties of coated and un-coated polyolefine films. Eight types of packaging films are prepared by standard in…