Materials Literature
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Dual beam FIB (focused ion beam)/SEM (scanning elelctron microscope) systems are commonly used for imaging, selective etch and deposition of materials like platinum. The paper presents the results of electrical characterization of platinum thin films deposited by focused ion beam. For measurements, two types of test s…
Abstract Time Resolved Photoluminescence (TRPL) measurements on the picosecond time scale (temporal resolution of 17 ps) on colloidal CdSe and CdSe/ZnS Quantum Dots (QDs) were performed. Transient PL spectra reveal three emission peaks with different lifetimes (60 ps, 460 ps and 9–10 ns, from the bluest to the reddest…
In many problems in molecular and solid state structures one seeks to determine the energy-minimizing decoration of sites with different atom types. In other problems, one is interested in finding a decoration with a target physical property (e.g. alloy band gap) within a certain range. In both cases, the sheer size o…
We have prepared light emitting nanocrystallline porous silicon (PS) layers by electrochemical anodization of crystalline silicon (c-Si) wafer and characterized the c-Si/PS heterojunctions using temperature dependence of dark current–voltage (I–V) characteristics. The reverse bias I–V characteristics of c-Si/PS hetero…
Abstract The short chain branching distribution (SCBD) and thermal properties of ethylene/1‐pentene copolymers were studied using SEC‐FTIR and SEC‐HPer DSC. The copolymers, synthesized with Cp 2 ZrCl 2 /MAO, were fractionated using size exclusion chromatography (SEC). The infrared analysis of the fractions showed that…
Higher-dimensional crystals have been studied for the last thirty years. However, most practicing chemists, materials scientists, and crystallographers continue to eschew the use of higher-dimensional crystallography in their work. Yet it has become increasingly clear in recent years that the number of higher-dimensio…
Fluorescence microscopy in combination with multiple, simultaneous labeling of biomolecules has been a key breakthrough in cell biology. However, the spatiotemporal resolution of this approach is limited by bleaching of the fluorescence label and illegitimate cross-reference of the label. CdSe-based semiconductor nano…
Polycrystalline KZnSO4Cl : Eu and KMgSO4Cl : Eu prepared by a wet chemical method have been studied for their thermoluminescence (TL) and photoluminescence (PL) characteristics. The PL emission spectra of the phosphor suggests the presence of Eu2+ and Eu3+ in the host compound occupying two different lattice sites. Th…
The $4{f}^{6}\ensuremath{\rightarrow}4{f}^{5}5{d}^{1}$ absorption spectrum of the ${\mathrm{Sm}}^{2+}$ ions incorporated in a ${\mathrm{SrCl}}_{2}$ single crystal was recorded at $4.2\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ in the $15\phantom{\rule{0.2em}{0ex}}000--45\phantom{\rule{0.2em}{0ex}}000\phantom{\rule{0.3em}{0…
Toroids comprised of silica‐coated 10 nm diameter nickel–zinc (Ni–Fe) ferrite nanoparticles (Ni 0.5 Zn 0.5 Fe 2 O 4 ) have been fabricated by careful control of both the coating process and subsequent densification by viscous sintering. A narrow processing window is identified between a maximum temperature at which th…
In this article we reconsider the discussion of the magnetic measurements for the two novel polyoxotungstates, (n-BuNH(3))(12)[(CuCl)(6)(AsW(9)O(33))(2)].6H(2)O and (n-BuNH(3))(12)[(MnCl)(6)(SbW(9)O(33))(2)].6H(2)O, which have been synthesized and characterized by Yamase et al. (Inorg.Chem. 2006, 45, 7698). Analysis o…
Abstract The adsorption and aqueous lubricating behaviour of poly( l ‐lysine)‐ graft ‐poly(ethylene glycol) (PLL‐ g ‐PEG) have been investigated for tribopairs involving thermoplastic materials, including polypropylene, polyamide‐6,6 and polyethylene. A major finding is that PLL‐ g ‐PEG adsorbs onto both hydrophobic,…
The aim of this investigation was to determine if the rapid solvent removal evaporation that occurs during electrospinning enabled the gluten protein and poly(vinyl alcohol) (PVOH) chains to remain at least partially entangled in the final product. Natural and synthetic biopolymer blends are known to phase separate in…
This paper presents a model describing the hysteresis in ferroelectric materials at moderate to high driving levels and from quasi-static frequency to high dynamics. To a quasi-static model, based on a simple mechanism related to the dry-friction concept, is added a polarization fractional derivative term to take into…
The influence of size, anisotropy and doping effects on the hysteresis loop of ferromagnetic nanoparticles is studied, based on the modified Heisenberg model. A Green's function technique in real space allows the calculation of the dependence of the magnetization on the temperature, magnetic field, anisotropy, defects…
The oxo-bridged dimer [Mo(2)O(4)(mu(2)-O)Cl(2)(pzH)(4)] (1; pzH = pyrazole) exhibits unusually high activity in the liquid-phase catalytic epoxidation of the cyclic olefins cyclooctene and (R)-(+)-limonene under mild conditions and in the absence of additional organic solvents, using tert-butyl hydroperoxide as the ox…
Abstract Aerobic reactions of Co(O 2 CR) 2 with 2‐(hydroxymethyl)pyridine (hmpH), in the presence of ClO 4 – counterions give the hexanuclear, mixed‐valence clusters [Co II 4 Co III 2 (O 2 CR) 4 (hmp) 8 ](ClO 4 ) 2 [R = Me ( 1 ), Ph ( 2 )] which possess the unprecedented [Co II 4 Co III 2 (μ 3 ‐OR′) 4 (μ‐OR′) 4 ] 6+ […
Stabile, hell leuchtende Nanopartikel aus konjugierten Polymeren (CPNs) sind aussichtsreiche Systeme für die Fluoreszenzbildgebung lebender Zellen. Die zellgängigen CPNs werden durch einfachen Lösungsmittelaustausch synthetisiert und reichern sich ohne merkliche Beeinträchtigung der Zellfunktionen ausschließlich im Cy…
A series of 2,2'-bipyrroles has been efficiently synthesized using an improved synthetic approach based on Pd(0)-catalyzed homocoupling of various 2-iodopyrroles. This new synthetic approach takes place at room temperature and in the presence of water. Functional groups such as formyl, ester, and nitrile are able to s…
The experimental researches on Equal Channel Angular Extrusion (ECAE) process of commercial available Al-6061 alloy were conducted and the grain refinement after ECAE processing was investigated. Sixteen passes of ECAE processing at room temperature were conducted and the relationship of grain refinement with extrusio…