Materials Literature
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A brief survey of host–guest interactions involving dendritic architectures is presented. Discussion begins with an examination of early examples of branched motifs described as ‘micelle-like’ and progresses through to current investigations of unimolecular micelles and their attendant supramolecular properties.
4(R)-Hydroxyproline in the Yaa position of the -Gly-Xaa-Yaa-repeated sequence of collagen plays a crucial role in the stability of the triple helix. Since the peptide (4(R)-Hyp-Pro-Gly)10 does not form a triple helix, it was generally believed that polypeptides with a -Gly-4(R)-Hyp-Yaa-repeated sequence do not form a…
Electromigration in Cu Damascene lines with bamboo-like grain structures, either capped with Ta/TaN, SiNx, SiCxNyHz layers, or without any cap, was investigated. A thin Ta/TaN cap on top of the Cu line surface significantly improves electromigration lifetime when compared with lines without a cap and with lines capped…
Edible films based on gluten from four types of Brazilian wheat gluten (2 "semi-hard" and 2 "soft") were prepared and mechanical and barrier properties were compared with those of wheat gluten films with vital gluten. Water vapor, oxygen permeability, tensile strength and percent elongation at break, solubility in wat…
We show that the rheology of a silazane‐based precursor for a silicon carbonitride ceramic can be radically altered by reacting it with an alkoxide precursor. This modified precursor can be drawn into fibers by a simple process. The fiber‐friendly rheology of the modified precursor is ascribed to the creation of linea…
NAD + is the oxidized form of the coenzyme redox pair NAD + /NADH and plays a main role in catalysis of biological processes. Accurate X-ray diffraction data have been collected at 100 K from a crystal of the free acid form of the coenzyme NAD + with a CCD area detector up to 0.55 Å resolution. A multipole refinement…
A combined structural study on ternary phosphate glasses (MnO)x(NaPO3)1−x, x = 0.0, 0.024, 0.048, 0.167, is performed using X-ray diffraction, EXAFS and Raman spectroscopy. The mean Mn-O nearest-neighbour distance and the Mn-O coordination number in the glass with 16.7 mol% MnO are 2.15(2) °A and 5.7±0.4, respectively…
On-line partial discharge (PD) detection of three-phase belted medium voltage cable connections results in a number of interpretation differences as compared to off-line measurements where only one phase is energized. The induced currents and charges in the phase conductors and earth screen upon a PD not only depend o…
We describe some of our principal results on the thermo- piezo- and magneto-switching of spin crossover phenomenon in inorganic molecular materials: experimental properties, theoretical approaches and channels for molecular memory devices.
A tridentate ONN donor ligand, 5-methyl-3-(2-hydroxyphenyl)pyrazole; H2L, was synthesized by reaction of 2-(3-ketobutanoyl)phenol with hydrazine hydrate. The ligand was characterized by IR, 1H NMR and mass spectra. 1H NMR spectra indicated the presence of the phenolic OH group and the imine NH group of the heterocycli…
Aluminum (Al) doped ZnO (AZO) films were grown on sapphire substrate via oxygen radical assisted molecular beam epitaxy (MBE) technique. The results of XRD measurement and temperature dependence Hall measurement confirmed that the AZO films were typically highly degenerate semiconductor with good crystallinity. The op…
Transmission electron microscopy (TEM) has been used to investigate dendritic forsterite systematically, in order to understand its morphology in three dimensions. TEM images of olivine dendrites are reported for the first time. Crystals have been obtained by dynamic crystallization in the CaO-MgO-Al 2 O 3 -SiO 2 (CMA…
We have performed classical molecular dynamics simulations of amorphous Si–C–N materials. The dependence of the local order and of the microstructure on the chemical composition was investigated. Our simulations show that for a stoichiometric nitrogen/silicon ratio equal to or higher than 4/3, the amorphous ceramic se…
The objective of this work is to use porous silicon (PSi) layers as substrate material to transduce hybridization of DNA into a change in conductance. A coplanar configuration of the contact electrodes allows a complete exposure of the porous silicon layer to the sensing species without the need of top contacts or ele…
Complex (Mn, X)S compounds nucleated on Al2O3-based sites were found as the major nucleation sites for graphite flakes in both un- inoculated and inoculated grey irons. (Mn, X)S particles (1–8 fun) and their corresponding nuclei (0.1–2.7 μm) were characterized as size, morphological features and distribution patterns…
Lithium insertion into nanoporous anatase TiO2 electrodes has been studied using resonant inelastic soft-x-ray scattering spectroscopy (RIXS). We have measured Ti 2p absorption, L2,3-emission and resonant inelastic scattering spectra of pristine anatase TiO2 and Li inserted TiO2. Inelastic scattering features in RIXS…
The present work is a study of the thermal properties of Mg–xLi–y Al with x= 4, 8 and 12 wt-% and y= 0, 3 and 5 wt-% as a function of temperature in the range 20–375°C. The thermal diffusivity and coefficient of thermal expansion (CTE) have been measured and the thermal conductivity calculated. The thermal diffusivity…
Cerium conversion layers (CeCL) have been investigated as a replacement for chromium conversion layers to protect Al alloys against corrosion. In this work the microstructure and the electrochemical behaviour of aluminium alloy 2024 with and without CeCL were investigated using, respectively, SEM-EDX and EIS. EDX resu…
Abstract The melt radical grafting of glycidyl methacrylate (GMA) onto isotactic polypropylene (PP) was carried out in Brabender internal mixer and the influence of reaction procedure, radical initiator concentration and addition of co‐monomer (styrene) on the grafting efficiency was examined. The viscosity, the therm…
Microstructure development in Sb 2 O 3 ‐doped ZnO was studied to evaluate the influence of inversion boundaries (IBs) on ZnO grain growth. In general, the addition of Sb 2 O 3 is believed to inhibit the ZnO grain growth via the formation of spinels and IBs, but we have shown that even the conditions of exaggerated gra…