Materials Literature
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Abstract Unsaturated long‐chain carboxylic acid amides like Erucamide are very efficient as slipping agents in polyolefin films and other polymers. A problem is the uncontrolled migration of this additive. The main goal of the present project was therefore the study and understanding of Erucamide diffusion through the…
Abstract A novel chiral azobenzene polyurethane (CAPU) was prepared from chromophore, chiral reagent L(−)‐tartaric acid and toluene diisocyanate (TDI). The chemical structure and the thermal property were characterized by UV‐Vis spectrum, FT‐IR, 1H NMR, circular dichroism (CD) spectrum, differential scanning calorimet…
Nano-fibrillated cellulose was produced from flax and wheat straw cellulose pulps by high pressure disintegration. The reinforcing potential of both disintegrated nano-celluloses in a polyvinyl-alcohol matrix was evaluated. Disintegration of wheat straw was significantly more time and energy consuming. Disintegration…
Stapelhilfe: Coronene ordnen sich im Inneren einwandiger Kohlenstoff-Nanoröhren (SWCNTs) zu koaxialen 1D-Strukturen an (siehe Bild). Die resultierenden Coronensäulen haben charakteristische Fluoreszenzspektren, die sich signifikant von denen isolierter Coronen-Moleküle und dreidimensionaler Kristalle unterscheiden.
We present a detailed study of Raman spectroscopy and photoluminescence measurements on Li-doped ZnO nanocrystals with varying lithium concentrations. The samples were prepared starting from molecular precursors at low temperature. The Raman spectra revealed several sharp lines in the range of 100-200 cm(-1), which ar…
Polylactic-co-glycolic nanocapsules, loaded with nanosized magnetic particles and Selol (a selenium-based anticancer drug), were successfully prepared by the precipitation method. Maghemite (γ-Fe2O3) nanoparticles were incorporated into the nanocapsules using a highly stable ionic magnetic fluid sample. The obtained n…
Abstract Bi5Ti3FeO15 (BTF) doped with (Na,Ce) was prepared by solid‐state reaction sintering. Effects of (Na,Ce) doping on the structure, microstructure, and electrical properties of BTF were investigated. The Curie point decreased from 759 to 711 °C with increasing dopant amount. At low temperatures (50–400 °C), peak…
Thin (∼30 μm), dense Ce0.9Gd0.1O1.95-δ (CGO10) membranes (5 × 5 cm2) supported on a porous NiO/YSZ substrate were fabricated by tape casting, wet powder spraying and lamination. A La0.58Sr0.4Co0.2Fe0.8O3-δ/Ce0.9Gd0.1O1.95-δ (LSCF/CGO10) composite cathode was applied by screen printing. Oxygen permeation measurements a…
Abstract We investigated the molecular orientation and surface morphology of organized molecular films with regard to solid‐state structures for organo‐modified montmorillonites by surface pressure‐area (π − A ) isotherm, in‐plane and out‐of plane X‐ray diffraction (XRD), and atomic force microscopy (AFM). From the re…
Fe(7)Se(8) polyhedra with high-index facets and Fe(7)Se(8) nanorods can be selectively synthesized by a solvothermal reaction in a mixed solvent of diethylenetriamine (DETA) and deionized water (DIW). It is found that the morphologies of Fe(7)Se(8) nanocrystals can be effectively controlled by adjusting the volume rat…
In this paper, we present first results of in situ characterization of nitrogen vacancy (NV)-center formation in single-crystal diamonds after implantation of low-energy nitrogen ions (7.7 keV), co-implantation of hydrogen, helium and carbon ions and in situ annealing. Diamond samples were implanted either at room tem…
Advantage is taken of the wealth of experimental data relating to the evolution with temperature of spin states of Co(3+) in LaCoO₃ in order to undertake a detailed investigation of the mechanisms by which changes in electronic structure can influence strain, and elastic and anelastic relaxations in perovskites. The m…
It is shown that attempts to accurately deduce the magnetic penetration depth $\ensuremath{\lambda}$ of overdoped ${\mathrm{BaFe}}_{1.82}{\mathrm{Co}}_{0.18}{\mathrm{As}}_{2}$ single crystals by transverse-field muon spin rotation (TF $\ensuremath{\mu}\mathrm{SR}$) are thwarted by field-induced magnetic order and stro…
Porphyrins may be used as photosensitizers for photodynamic therapy, photocatalysts for organic pollutant dissociation, agents for medical imaging and diagnostics, applications in luminescence and electronics. The detection of porphyrins is significantly important and here the interaction of protoporphyrin-IX (PPIX) w…
A bottom-up approach for constructing colloidal semiconductor quantum dot (QDot) nanocomposites that facilitate nonradiative Förster-type resonance energy transfer (FRET) using polyelectrolyte peptides was proposed and realized. The electrostatic interaction of these polypeptides with altering chain lengths was probed…
We report a study of the attenuation spectra transformations for a series of Bismuth (Bi) doped silica fibers with various contents of emission-active Bi centers, which arise as the result of irradiation by a beam of high-energy electrons. The experimental data reveal a substantial decrease of concentration of the Bi…
The temperature dependence of the dynamics of glass-forming systems remains an important fundamental problem in glass physics. Here we use literature data [S. A. Hutcheson and G. B. McKenna, J. Chem. Phys. 129, 074502 (2008)] reanalyzed with the Baumgärtel-Schausberger-Winter (BSW) [M. Baumgärtel, A. Schausberger, and…
A set of knitted poly(lactic acid) (PLA) fabrics was ozonated at room temperature for periods ranging from one to 60 minutes in order to identify any accompanying effects on physical properties (specifically whiteness, water-absorbency, flexural rigidity and burst strength), fiber surface integrity or internal microst…
We demonstrate the fabrication of reduced graphene oxide (RGO) Schottky diodes via dielectrophoretic (DEP) assembly of RGO between two dissimilar metal contacts. Titanium (Ti) was used to make a Schottky contact, while palladium (Pd) was used to make an Ohmic contact. From the current–voltage characteristics, we obtai…
To develop a suitable method for the mass production of polyaniline (PANI) nanofibers, the preparation of PANI nanofibers was carried out by high gravity chemical oxidative polymerization (HGCOP) in a rotating packed bed (RPB) for the first time. The influences of operating conditions, e.g., aniline concentration, hig…